pheonwj-m-spe-0021~1 piping fabrication & installation
DESCRIPTION
PHEONWJ-M-SPE-0021~1 Piping Fabrication & InstallationTRANSCRIPT
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PT. PHE ONWJ Piping Fabrication, Installation and Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 2 of 22
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Revision Log Register
Revisions had been performed on following pages:
Page Date Revision
All 20 May 2012
Change Document number to PHEONWJ-M-SPE-0021 was
PHEONWJ-X-SPE-0001
Change PHE ONWJ Ltd become PT. PHE ONWJ
Update Header and Footer
Update Reference document with new document Number
4 of 22 20 May 2012 Add references of ASME B16.9 and ASME B16.11
5 of 22 20 May 2012
Corrected abbreviation for DN Diameter Nominal instead of
Diameter Number
16 of 22 20 May 2012 Revise interval calibration for pressure gauges and recorder
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Table of Content
Revision Log Register ............................................................................................................................. 2
Table of Content ..................................................................................................................................... 3
1. Scope .............................................................................................................................................. 4
2. References ...................................................................................................................................... 4
3. Definition of Terms .......................................................................................................................... 5
3.1 Definitions ............................................................................................................................... 5
3.2 Terms ...................................................................................................................................... 5
4. Abbreviations .................................................................................................................................. 5
5. Fabrication ...................................................................................................................................... 6
5.1 Welding ................................................................................................................................... 6
5.1.1 Qualification of Welding Procedure ............................................................................. 6
5.1.2 Qualification for Welding ............................................................................................. 6
5.1.3 Welding Materials ........................................................................................................ 6
5.1.4 Preparation for Welding .............................................................................................. 6
5.1.5 Welding Requirements ................................................................................................ 7
5.2 Cutting .................................................................................................................................... 8
5.3 Preheating .............................................................................................................................. 8
5.4 Heat Treatment ....................................................................................................................... 9
5.4.1 Heat Treatment Requirements .................................................................................... 9
5.4.2 Heating and Cooling .................................................................................................... 9
5.4.3 Hardness tests ............................................................................................................ 9
5.4.4 Specific requirements .................................................................................................. 9
5.5 Bending and Forming ........................................................................................................... 10
5.5.1 General ...................................................................................................................... 10
5.5.2 Platform Piping Bend ................................................................................................ 11
5.5.3 Inspection .................................................................................................................. 12
6. Installation ..................................................................................................................................... 12
6.1 Alignment ............................................................................................................................. 12
6.1.1 Piping Distortions ...................................................................................................... 12
6.1.2 Flanged Joints ........................................................................................................... 12
6.2 Erection ................................................................................................................................. 12
6.2.1 Butt Welds ................................................................................................................. 12
6.2.2 Flange Connections and Bolt Joints ......................................................................... 13
6.2.3 Socket Weld Connections ......................................................................................... 14
6.2.4 Screwed Thread Connections ................................................................................... 14
6.2.5 Seal Welding ............................................................................................................. 14
6.2.6 Branch Connections .................................................................................................. 15
6.2.7 Expanded Joints and Special Joints ......................................................................... 15
6.2.8 Packed Joints ............................................................................................................ 15
6.2.9 Taper-Threaded Joints .............................................................................................. 15
7. Testing .......................................................................................................................................... 16
7.1 General ................................................................................................................................. 16
7.2 Pressure Testing ................................................................................................................... 16
7.3 Cleaning of Piping................................................................................................................. 16
8. Fabrication, Erection, Inspection, and Testing of Non Metallic Piping ....................................... 17
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1. Scope
This specification covers the minimum requirements for the fabrication, installation, and testing
of piping systems for PT. PHE ONWJ, Onshore and Offshore Facilities.
This specification is not intended to testing of piping that has been placed in service.
Where local codes or regulations are more stringent than the specification, the requirements of
the local codes or regulations shall govern.
When required by the project specifications, piping materials shall be colour coded.
2. References
The following publications form a part of this specification. Unless otherwise specified herein,
use the latest edition.
PHE ONWJ Specifications:
PHEONWJ-I-PRC-0011 Quality Manual
PHEONWJ-L-SPE-0001 Painting Specification for External Metal Surfaces
PHEONWJ-M-SPE-0024 General Piping Design Specifications
PHEONWJ-M-SPE-0005 Piping Material Specification
PHEONWJ-M-SPE-0256 General Piping Systems Field Test Specification
PHEONWJ-M-SPE-0258 Cleaning Pickling and Passivating Procedure for Piping
PHEONWJ-W-SPE-0001 Specification for Pipeline Induction Bends
API (American Petroleum Institute):
API Spec 6A Wellhead and Christmas Tree Equipment
API RP 14E Recommended Practice for Design and Installation of
Offshore Production Platform Piping System
API 1104 Welding of Pipeline and Related Facilities
ASME (American Society of Mechanical Engineering):
Boiler and Pressure Vessel Welding and Brazing Qualifications
Code Section IX
ASME B1.20.1 Pipe Thread General Purpose
ASME B16.9 Factory Made Wrought Buttwelding Fittings
ASME B16.11 Forged Fittings, Socket-Welding and Threaded
ASME B16.5 Pipe Flanges and Flanged Fittings
ASME B16.25 Buttwelding Ends
ASME B31.3 Process Piping
ASME B31.4 Pipeline Transportation System for Liquids Hydrocarbon and
Other Liquids
ASME B31.8 Gas Transmission and Distribution Piping System
PFI (Pipe Fabrication Institute):
ES 3 Fabricating Tolerances
Local Regulation:
Ditjen MIGAS regulation
SNI 13-3499-2002 Perpipaan Pengolahan
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3. Definitions and Terms
3.1 Definitions
The following definitions shall apply throughout the specification:
a. The COMPANY shall mean PT. PHE ONWJ (PT. Pertamina Hulu Energi ONWJ)
b. The CONTRACTOR shall mean the primary contractor and any subcontractors
engaged in work covered by COMPANY project.
c. The PURCHASER shall mean PT.PHEONWJ, PT.PHEONWJ affiliation organization,
or PT.PHEONWJ designated representative responsible for processing equipments,
components, material systems or services.
d. The VENDOR shall mean the party which manufactures or supplies the equipment
and services to perform the duties specified by the "CONTRACTOR" / "COMPANY"
FABRICATION.
3.2 Terms
Throughout this document, the words will, may, should, shall and must, when used in
the context of actions by PT. PHE ONWJ or others, have specific meanings.
For purposes of this Specification, the following terms apply:
Will
Used normally in connection with an action by PT. PHE ONWJ rather than by a contractor
or supplier.
May
Used if alternatives are equally acceptable.
Should
Used if a provision is preferred.
Shall
Used if a provision is mandatory by PT. PHE ONWJ.
Must
Used only if a provision is a statutory requirement.
4. Abbreviations
ANSI - American National Standards Institute
API - American Petroleum Institute
ASTM - American Society for Testing and Materials
ASME - American Society of Mechanical Engineers
DITJEN MIGAS - Direktorat Jenderal Minyak dan Gas
DN - Diameter Nominal
NDT - Non Destructive Testing
NPS - Nominal Pipe Size
NPT - Nominal Pipe Thread
OD - Outside Diameter
PHE ONWJ - Pertamina Hulu Energi Offshore North West Java
PQR - Procedure Qualification Test Result
PWHT - Post Weld Heat Treatment
QC - Quality Control
WPS - Welding Procedure Specification
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5. Fabrication
5.1 Welding
5.1.1 Qualification of Welding Procedure
Welding Procedure Specification (WPS) and Procedure Qualification Test Result (PQR)
shall be subject to COMPANY approval prior to commencement of fabrication.
Each Welding Procedure Specification (WPS) and Procedure Qualification Test Result
(PQR) shall be certified by DITJEN MIGAS.
All steel pipe welds, except as noted otherwise herein or shown on the drawings, shall be
made with a qualified welding procedure as specified in accordance with Section IX of the
ASME Boiler and Pressure Vessel Code, or ASME B31.3, latest editions, whichever is
applicable to the work involved. Welding procedures shall include preheating of welds and
/ or post-weld heat treating requirements and must be approved by COMPANY prior to
commencement of fabrication.
5.1.2 Qualification for Welding
Welded joints in process and service lines being constructed under the construction code
of ASME B31.3 shall be made with a qualified WPS (Welding Procedure Specification) by
welding operators or welders qualified either in accordance with Section IX of the ASME
Boiler and Pressure Vessel Code, or ASME B31.3, latest editions, whichever is applicable
to the work involved.
Welder and welding operator performance qualifications from other employers are not
acceptable.
5.1.3 Welding Materials
a. Filler Metal
Filler metal shall conform to the requirements of ASME Section IX. A filler metal not
yet incorporated in ASME Section IX, latest edition, may be used with the owners
approval if a procedure qualification test is first successfully made.
b. Backing Rings
The uses of backing rings are not permitted without prior COMPANY approval.
c. Consumable Inserts
The uses of consumable inserts are not permitted without prior COMPANY approval.
5.1.4 Preparation for Welding
a. Cleaning of Grooves
Prior to welding the pipe bevel, all surfaces adjacent thereto shall be thoroughly
cleaned of all scale, rust, grease, oil, or other foreign material.
b. Welding Grooves
The ends of steel pipe and fittings to be erected with butt welded joints shall be
bevelled to form welding grooves in accordance with ASME B31.3, latest edition, and
with ASME B16.25, latest edition.
c. Alignment
Prior to circumferential welding, inside surface shall be aligned and external surface
shall be tapered as required by ASME B31.3 latest edition.
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Misalignment shall not exceed that specified in ASME B31.3.
Prior to longitudinal welding, grove welding shall conform to the requirements as
required by ASME B31.3 latest edition.
Branch connection weld and weld spacing shall meet WPS requirements as required
by ASME B31.3 latest edition.
Flange bolt holes shall straddle the establish centerlines, unless another orientation is
required to match the flanged connections on equipment.
Slip-on flanges shall be positioned so that the distance from the face of the flange to
the pipe end shall be equal to the normal pipe wall thickness plus 3 mm 1.5 mm (1/8
in. 1/16 in.). The seal weld shall be applied so that the flange does not need re-
facing.
Welding neck orifice flange shall be the same bores as the pipe to which they are
attached and shall be aligned as accurately as is practicable.
If external force is required to ensure proper line-up only exterior line-up clamps are to
be used. Waivers to this requirement may be granted by COMPANYs on site
representative, but only where it can be demonstrated that the use of line-up clamps is
impractical due to pipe geometry or physical interference.
5.1.5 Welding Requirements
a. Weld Quality
Butt welds shall have full penetration and complete fusion with a minimum of weld
metal protruding on the inside of the pipe per ASME B31.3.
All welds shall be of sound deposit with a straight line of fusion.
The finished weld contour shall be uniform, with the toe or edge of the weld merging
smoothly into the base material. Butt welds shall have a slight reinforcement built up
gradually from the toe or edge toward the center of the weld per ASME B31.3 latest
edition. Fillet welds may be slightly concave on the finished surface.
No welding shall be done if there is impingement on the weld area of rain, snow, sleet,
or excessive wind, or if the weld area is frosted or wet.
The welding sequence and procedure and any heat treatment for a welding end valve
shall be such as to preserve the seat tightness of the valve.
Radiography shall be required as indicated in Piping Material Specifications.
Normally, ultrasonic testing, in lieu of radiography, is acceptable only where
radiography is not practicable.
b. Cleaning of Welds
All slag or flux remaining on the bead of a weld shall be completely removed before
laying down the next successive bead and the completion of the weld.
c. Defects in Welds
If any cracks or blow holes occur on the surface of any welding bead, they shall be
chipped out with a round nosed chisel to remove the defect and present such a
surface that complete fusion may be obtained with the next successive welding bead.
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Sizes of fillet welds for attaching socket welding components and slip-on flanges shall
be not less than shown in B31.3, and;
1. The weld shall be at least a two pass weld.
2. The size of the fillet weld used in attaching the hub of a slip-on flange to the pipe
shall not be less than 6 mm (1/4 in.).
3. In socket welding construction, it is necessary to have engagement between the
pipe and the socket. Before a socket weld is started, the gap at the bottom of the
socket between pipe and valve, lifting, or flange shall be 1.5 mm to 6 mm (1/16 in.
to in.).
d. Identification of Code Welders
Each welder employed for shop or field welding of pipe joints, to be fabricated and
erected according to the Code authorities, shall be assigned an identifying number
and a list shall be compiled of such welders with their respective numbers. This list
must be maintained accurately with deletions and additions reported promptly. Upon
completing a joint, the welder shall write his identifying number and the last two digits
of the year in which the work was performed using colored crayons around the pipe
within 6 inches of the weld.
5.2 Cutting
It is preferred that the ends of pipe, as well as the edges of plate that is to be formed into
pipe, is shaped by machine. Other methods of shaping may be employed, provided that a
reasonably smooth and clean surface is attained. No flame cutting of quenched and
tempered carbon steels (for example, ASTM A672 Classes 50, 51, 52 and 53), high-
strength micro-alloyed steels (for example, ASTM A714, API 5L Grade 65 or 70) shall be
done unless the flame-cut surface is machined or ground to sound metal. At least 1/16 in.
(1.5 mm) of metal shall be removed.
Arc-cut and flame cut edges of 1 Cr-1/2Mo and higher alloy materials shall be examined
for cracks after machining or grinding by the dye penetrant or magnetic particle method.
All cracks shall be removed by machining or grinding.
In case of gas cutting, cutting surface shall be ground off to remove any edge and
roughness and be made flush and smooth so as not to harm welding quality. In the case
of automatic or semiautomatic gas cutting, the cut edge may be bevelled without such
grinding off.
In case of gas cutting, hole cutting by gas, all cut out material inside pipe shall be
completely removed.
Abrasive disc used for cutting or grinding of austenitic stainless steels or other high Cr-Ni
Steels shall not be used for carbon steels or vice versa.
Plasma jet cutting may be applied for stainless steel, etc.
5.3 Preheating
Preheat shall be in accordance with ASME B31.3, Table 330.1.1 and 331.1.1. Normally it
is only use to remove moisture from joint.
Preheat temperature shall be checked by use of temperature indicating crayons,
thermocouple pyrometers or other suitable means to ensure that the temperature specified
in the WPS is obtained prior to and maintained during welding. Preheat shall be uniform
and involve the entire weld preparation area. The preheat zone shall extend at least 25
mm (1 in) beyond each edge of the weld.
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5.4 Heat Treatment
Post weld heat treatment (PWHT) or stress-relieving shall be in accordance with ASME
B31.3, Table 330.1.1 and 331.1.1, for carbon steel with a nominal thickness of more than
3/4 inch.
After heat treatment, the metal shall be cooled down with the cooling rate according to
table 331.1.1 ASME B31.3.
5.4.1 Heat Treatment Requirements
Specific applications for which heat treatment is required shall be identified by the
engineering design.
If stress relief heat treatment of austenitic steels is specified by the engineering design,
welds shall be heated to temperature in range of 900C - 950C (1650F - 1740F) and
held for 1 hour per 25 mm (1 in) of thickness. Minimum soaking period shall be 1 hour.
Low melting point metals, such as aluminium, lead, tin, copper, zinc, cadmium, and
mercury, and their alloys, shall not be permitted to contact surfaces that will undergo hot
forming, welding, or post weld heat treatment.
5.4.2 Heating and Cooling
Should heat treatment be necessary during fabrication of other alloys covered by this
Specification, full details of soaking temperature and time, along with applicable heating
and cooling rates will be provided by engineering design.
If practical, thermocouples shall be attached to spool pieces at minimum of six equally
spaced locations, adjacent to welds, prior to heat treatment.
Procedures for attachment of thermocouples by capacitor discharge welding shall be
subject to COMPANY approval. Use of this technique shall be carefully monitored.
5.4.3 Hardness tests
Additional requirement for hardness testing may be specified by engineering design.
5.4.4 Specific requirements
If local heat treatment is applied, weld shall be sufficiently heated and insulated to ensure
that (for a pipe of DN (NPS) D and wall thickness t):
Specified heat treatment temperature is achieved at weld.
Within distance of 1.8 Dt on both sides of the weld, temperature of not less than half of
specified heat treatment temperature is attained.
In the case of branch attachments, temperature gradient shall be such that length of
material from each crotch heated to temperature equalling half heat treatment temperature
shall be 1.8 Dt (where D and t are the nominal diameter and thickness of the main pipe
and branch as appropriate).
D is expressed as DN (NPS), tis expressed in mm (in), and temperature is expressed in
C. (See Figure 1)
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5.5 Bending and Forming
5.5.1 General
Pipe may be bent and components may be formed by any hot or cold method which is
suitable for the material, the fluid service, and the severity of the bending or forming
process. The finished surface shall be free of cracks and substantially free from buckling.
Thickness after bending or forming shall be not less than that required by the design.
a. Material
The pipe used for bends shall be SEAMLESS, API-5LB, ASTM A106-B or A53-B
made by the open hearth or electric furnace process. Cold worked pipe is prohibited.
b. Forming
Pipe bends shall be formed while cold. Care shall be taken during forming to ensure
that the cross section of the pipe is preserved within the limitations imposed by the
applicable code.
The pipe diameter at the bevelled ends of the completed bend shall not exceed the
diameter of the pipe from which the bend was formed.
For cold formed bends which incorporate internal pressurization of the pipe during
bending, the finished bend diameter, other than at the bevelled ends, shall not exceed
the limits shown in attached Tables 1, 2 and 3.
c. Bend Radius
Pipe bends shall have a minimum bend radius equal to five (5) times the nominal
diameter on pipe sizes thru 14" (R=5D), and eight (8) times the nominal diameter of
the pipe on NPS 16" and larger. (R=8D).
d. Included Angle
The included angle of the pipe bend shall be as described on the applicable design
drawing. Should a conflict arise between this document and the bend drawing, the
drawing shall govern.
e. Beveled Bend
Both ends of each bend shall be bevelled for welding unless otherwise noted. Both
ends of each bend shall be protected with metallic end caps.
f. Thinning
The wall thickness of a finished bend shall be no less than 92% of the wall thickness
of the pipe from which the bend was formed.
g. Tangents
All finished bends shall have a minimum straight length from bend tangents to
bevelled ends of 2-0" unless otherwise stipulated on the design drawings, in which
case the drawing shall govern.
h. Heat Treatment
All bends with wall thickness of 0.75" or more shall be heat treated.
Heat treatment may be accomplished by any acceptable method used in the industry
which provides the required metal temperature, metal temperature uniformity, and
temperature control such as an enclosed furnace, electric resistance, or electric
induction.
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Cooling may be accomplished in a furnace, in air, with the aid of local thermal control,
with the application of heat or insulation, or in any other manner required to achieve
the desired cooling rate.
5.5.2 Platform Piping Bend
a. Code of Practice
Pipe bends formed for use in a platform piping system shall meet the requirements of
the latest edition of the American National Standards Institute code for Chemical Plant
and Petroleum Refinery Piping (ANSI B31.3).
b. Material
Platform piping bends may be formed only from materials which achieve their
minimum yield strength from chemical composition.
These bends may be fabricated from materials shown in attached Tables 1, 2 and 3.
The use of materials of yield strengths other than specified is prohibited.
c. Out of Roundness
Flattening of a bend, as measured by the difference between the maximum and the
minimum diameter at any cross section, shall not exceed 8% and 3% of the nominal
outside diameter for internal and external pressure respectively.
d. Taper Boring
Pipe bends will be inside taper bored at the bevelled end where required by the design
drawings.
e. Maximum Diameter
Cold formed pipe bends shall have a maximum outside diameter after forming per the
limits shown in Tables 1, 2 and 3.
f. Mill Test Certificates
Mill test certificates shall be provided for all materials used in the forming of pipe
bends.
g. Bending Temperature
Cold bending of ferrites materials shall be done at a temperature below the
transformation range.
Hot bending shall be done at a temperature above the transformation range and in
any case within a temperature range consistent with the material and the intended
service.
h. Corrugated and Other Bend
Fabricated miter (segmented) bends are not generally permitted.
Subject to agreement of COMPANY, limited use of mitered bends in accordance with
attached Figure 2 may be proposed.
Cut and shut design shall not be used.
i. Forming
The temperature range for forming shall be consistent with material, intended service,
and specified heat treatment.
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j. Required Heat Treatment
Heat treatment shall be performed in accordance with ASME B31.3 latest edition.
k. Hot Bending and Forming
After hot bending and forming, heat treatment is required for P-Nos. 3, 4, 5, 6, and
10A materials in all thicknesses. Durations and temperatures shall be in accordance
with ASME B31.3 latest edition.
l. Cold Bending and Forming
For any conditions after cold bending and forming, heat treatment is required as
described in ASME B31.3 latest edition.
5.5.3 Inspection
The outside diameter (O.D.) of the finished bend shall be checked at eight points equally
spaced throughout the curved portion of the bend to verify compliance with this
specification in accordance with Contractors QC plan for inspection of pipe bends.
The finished bend shall be ultra sonically tested to verify compliance with the minimum
wall thickness requirements of this specification.
The finished bend shall be checked for compliance with all requirements of this
specification.
Inspection shall be in accordance with ASME B 31.3
6. Installation
6.1 Alignment
6.1.1 Piping Distortions
Application of heat for correction of minor distortions shall only be undertaken with
COMPANY approval. Misalignment shall not exceed that specified in B31.3.
For application other than B31.3, CONTRACTOR shall consult it to COMPANY for
approval.
6.1.2 Flanged Joints
Before bolting up, flange faces shall be aligned to the design plane within 1 mm in 200 mm
(116 in./ft) measured across any diameter; flange bolt holes shall be aligned within 3 mm
(18 in.) maximum offset.
6.2 Erection
6.2.1 Butt Welds
Butt welding of pipe and fittings shall be bevelled for either 30
o
or 37-1/2
o
. (The 30
o
bevel
is preferred.) It will be permissible to weld 30
o
bevel to 37-1/2
o
bevel.
Weld reinforcement shall be applied so that the weld shall have a smooth contour which
will merge gradually with the surfaces of adjacent pipe and fittings.
If external force is required to ensure proper line-up only exterior line-up clamps are to be
used. Waivers to this requirement may be granted by COMPANYs on site representative,
but only where it can be demonstrated that the use of line-up clamps is impractical due to
pipe geometry or physical interference.
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Butt welding 90
o
elbows shall be long radius elbows unless otherwise approved by
COMPANY for use in restricted space.
Short radius elbows may be used with COMPANY approval if needed, but they shall be
derated to 80% of the calculated allowable working pressure if they are subjected to
pulsation. Miter elbows or bends shall not be used.
For a reducing fitting or reducer (large end and small end) of different weight designations
(schedule or weight), the fitting or reducer shall be of the higher weight designation.
6.2.2 Flange Connections and Bolt Joints
Flanges shall be used only for equipment nozzle flange connections, valve flange
connections, locations shown on the drawings, and lines specified herein. All slip-on
flanges require prior written COMPANY approval for use, and if approved are to be welded
on front and back per latest issue of ASME B31.3 requirements.
Weld neck flanges per ASME B16.5 shall be used for all hydrocarbons piping of 2" pipe
size and larger unless otherwise approved by the COMPANY. The following exceptions
are permissible:
a. Flanges per API Specification 6A may be used when needed to connect to valves or
for special lines such as well flow lines.
b. Special bolted connectors such as "Grayloc" or "Taperlok" may be used with
COMPANY approval, when appreciable savings of space and/or weight are of an
advantage.
c. Grooved connectors such as "Victaulic" may be used on drains.
d. Permanent connectors such as "Pyplok" may be used with approval for pipe sizes
through 1 1/2", when appreciable savings in cost to the COMPANY, and/or fabrication
time are of an advantage.
The wall thickness and the bore of the hubs of weld neck flanges shall match the pipe
when possible. If the wall thickness of the flange or pipe exceeds the thickness of the
other by more than 1/16", the thicker item shall be bored or trimmed at an angle of not
more than 30
o
to correct the difference to not more than 1/16". When the flange is thicker,
the required modification shall be shown on the flange description in the material list.
When the pipe is thicker, the drawing shall indicate that boring or trimming by the fab-
ricator is required.
The type of flanges, gaskets and stud bolts for each service and pressure class is
specified in ASME B16.5 and individual piping specification.
Flanges of ASME pressure class 400 shall not be used unless approved by COMPANY.
Flanges to mate with flat faced flanges on pumps or other machinery shall be flat faced. It
is satisfactory to machine the flat face from raised face flanges for this purpose. Full faced
gaskets shall be used with flat face flanges.
Reducing flanges shall not be used if space is available for pipe reducers or reducing
elbows.
Stud bolt lengths for flange systems shall be in accordance with ASME B16.5, when
applicable. For other cases, the minimum length shall provide for the last thread in each
nut to be complete engaged. The maximum length shall not cause the stud to extend
more than approximately 1/4" beyond the nut or three or fewer threads on each end
unless bolt tensioning equipment is used. Excessive torque shall not be applied when
installing.
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PT. PHE ONWJ Piping Fabrication, Installation and Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 14 of 22
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Flanges mating to 125# CI flanges shall be flat face.
Flanges for ASME Class 900 and lower shall be raised face. Flanges for ASME Class
1500 and higher shall be ring-joint type.
Bleed rings shall be steel, drilled and tapped 3/4" NPT.
New gasket shall be used in the final assembly of all joints opened for testing or cleaning
of piping system.
6.2.3 Socket Weld Connections
Where socket weld valves or fittings are used, the pipe shall be properly spaced in the
socket that no stresses will be imparted to the weld due to "bottoming" of the pipe in the
socket.
Fittings and valves with socket weld ends shall be used only on socket weld piping
systems.
6.2.4 Screwed Thread Connections
Screwed threads shall be clean cut with no burrs or stripping and shall be tapered
according to ASME B1.20.1. Dies shall be new, sharp, and properly designed for the
piping material. Immediately before erecting the piping, all threads of pipe and fittings shall
be thoroughly cleaned of cuttings, dirt, oil, or other foreign matter. The male threads shall
be coated with thread sealant of a type compatible with both the process fluids and the
fitting metallurgy, and the piping made up sufficiently for the threads to seize.
"Thread-O-lets" shall be used for thermo wells, pressure taps, pressure gauges, sample
taps, drains and vents sized 1 1/2" and smaller on runs sized 2" and larger. Screwed tees
shall be used on runs size 1 1/2" and smaller, except for socket weld construction.
Screwed "Elbolets" shall be restricted to connections for thermo wells. Elbolets may be
used for drains and vents without COMPANY approval. They shall not be used for branch
pressure piping.
Threaded nipples shall be long enough to be held with a pipe wrench when fittings are in
place on each end. Close-taper (all-thread) nipples shall not be used. Nipples used with
socket welding fittings shall have plain ends.
Street elbows shall not be used. Threaded bushings shall not be used on process piping.
Hex bushings (but not flush bushings) may be used on air lines for connecting instrument
valves and tubing fittings.
Forged steel unions shall be forged from approved materials and have integral ground
seats.
Pipe thread sealant shall be Teflon Tape (max. 450
o
F).
6.2.5 Seal Welding
Where seal welding is called for hereinafter, or on the drawings, screwed steel fittings
shall be thoroughly cleaned and made up dry, using not thread sealant. After being made
tight, a seal bead shall be welded around each joint.
When seal welding of threaded connections is required, the following shall apply in
addition to paragraph 328.5.3 and 335.3.2 of B31.3:
a. The seal weld shall be at least a two-pass weld covering all exposed threads.
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PT. PHE ONWJ Piping Fabrication, Installation and Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 15 of 22
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b. Valve and union ends shall be welded by an electric arc welding process to minimize
distortion. Valves shall be closed during welding. Unless otherwise approved by
COMPANY, non metallic seats shall be removed during welding.
6.2.6 Branch Connections
Branch connections shall be made in accordance with branch connection as described in
PHEONWJ-M-SPE-0025 Piping Material Specification.
6.2.7 Expanded Joints and Special Joints
Expanded joints and special joints shall be installed and assembled in accordance with the
manufacturers instructions, as modified by the engineering design. Care shall be taken to
ensure adequate engagement of joint members.
6.2.8 Packed Joints
Where a packed joint is used to absorb thermal expansion, proper clearance shall be
provided at the bottom of the socket to permit this movement.
6.2.9 Taper-Threaded Joints
Threaded joints that leak during a pressure test shall be seal welded without COMPANY
approval. Approval to seal weld a threaded joint shall not be given where the threaded
joints has been provided for maintenance or operating reasons. In no event shall a
threaded joint be welded without complete removal of pipe thread lubricant.
Threaded joints shall be made up with a lubricant suited for the specific service. The
following, or their equivalents, are recommended as indicated:
Service
Service air and Hydrocarbon lines
bellow 260
o
C (500
o
F) and 40 MPa
(6000 psig)
Recommended Lubricant
Thread sealant paste or teflon tape
bellow 240
o
C (400
o
F)
Hydrocarbon lines above 260
o
C
(500
o
F)
Thread sealant paste
Instrument air, lube, seal, and control
oil piping
Teflon paste
Water and steam lines bellow 260
o
C
(500
o
F)
Federal process thread guard
Compound or teflon tape bellow
205
o
C (400
o
F)
Water and steam lines from 260
o
C
(500
o
F) to 540
o
C (1000
o
F)
Thread sealant paste
HF acid bellow 205
o
C (400
o
F) Teflon tape or paste
Oxygen Teflon tape (do not use flammable
material)
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PT. PHE ONWJ Piping Fabrication, Installation and Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 16 of 22
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7. Testing
7.1 General
Pressure and leak tests shall be performed in accordance with PHEONWJ-M-SPE-0256
General Piping Systems Field Test Specification and ASME B 31.3 requirements.
Testing procedures, schedules and Hydro test - Pneumatic Test Mechanical Flow
Diagrams shall be submitted for COMPANY approval during the design phase.
These procedures and documents shall be specifically related to each project.
The test pressure shall be maintained for an adequate time to determine small seepage
type leaks and to permit a thorough inspection. COMPANY requires minimum one (1)
hour test duration.
Manufacturers written approval as to the maximum test pressure that can be applied to its
valve in the closed position shall be obtained if the valve is to be tested in the closed
position. Prior written approval from COMPANY shall be obtained before testing with
valves in closed position is carried out.
All material shall be suitable for the hydrostatic test temperatures. Special consideration
shall be given to the possibility of brittle fracture.
Material such as gaskets, bolting, etc., damaged during test shall be replaced.
New gaskets shall be used for piping assembly after hydro test.
Packing shall be replaced in equipment such as valves when leaks cannot be stopped by
normal tightening of the packing glands.
7.2 Pressure Testing
Shop and field pressure tests shall be performed in accordance with B31.3, except that
pneumatic testing shall be subject to COMPANY approval. All pneumatic testing shall be
met the requirements of paragraph 345.5 of B31.3. The contractor shall submit all testing
procedures and schedules for approval. Pressure gauges and recorders used in the test
shall have been calibrated within the previous 30 days by internal institution, and shall
have valid calibration certificate by external authorize Calibration Institution, for max 12
(twelve) months period. Care should be taken to remove all water from piping to be
operated below 0
o
C (32
o
F). This includes relief valves, control valves, and any other
component that has been tested in a shop.
Hydrotest detail shall be detailed in procedure proposed by CONTRACTOR
Regardless of design temperature, all piping system shall be tested in accordance with
B31.3. This includes Category D Fluid Service and those systems designed at 100 kPa
gage (15 psig) or less (unless open to atmosphere)
Relief or blow down systems shall be tested in accordance with B31.3. However, in no
case shall be less than 100 kPa gage (15 psig). Relief valves and rupture discs shall not
be included in the test.
7.3 Cleaning of Piping
All piping systems shall be thoroughly cleaned and flushed with clean fresh water or air
prior to installation. Openings in the piping, where foreign material may enter during
construction, shall be covered.
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PT. PHE ONWJ Piping Fabrication, Installation and Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 17 of 22
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All pipe spools shall be free of sand, weld slag, or other foreign material before being
installed. COMPANYs Representative shall have the right to stop the work on any pipe
spool until it and the pipe to which it is to be connected is free of such material.
The following are some general considerations that may be evaluated in determining the
need for cleaning of piping:
a. Requirements of the service, including possible contaminants and corrosion products
during fabrication, assembly, storage, erection, and testing.
b. For low temperature service, removal of moisture, oil, grease, and other contaminants
to prevent sticking of valves or blockage of piping and small cavities.
c. For strong oxidizer fluid service (e.g., oxygen or fluorine), special cleaning and
inspection. Reference may be made to the Compressed Gas Associations Pamphlet
G-4.1 Cleaning Equipment for Oxygen Service.
8. Fabrication, Erection, Inspection, and Testing of Non Metallic
Piping
The fabrication, erection, inspection, and testing of non metallic piping shall be in accordance
with ASME B31.3, except that the following are not acceptable:
a. Bonding performance qualification testing results from another employer.
b. Branch connection made by inserting the branch pipe into a hole in the run pipe.
The extent of examination of non metallic piping shall meet the requirements of Paragraph
A341 of ASME B31.3.
The acceptance criteria for bonds are shown in table A341.3.2 of ASME B31.3.
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PT. PHE ONWJ Piping Fabrication, Installation And Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 18 of 22
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Table 1 Available Material Selections for Piping Bends (ANSI B31.3) Piping Specification Class "A" ANSI 150#
NOMINAL PIPE
DIAMETER
PIPE BEND
RADIUS
DESIGN
PRESSURE
DESIGN
TEMPERATURE
MAXIMUM
ALLOWABLE PIPE
DIA. AFTER
FORMING
MATERIAL TYPE NOMINAL WALL
THICKNESS (See
note 1)
(OD-inches) (inches) (psig) (
o
F) (inches) (inches)
6
(6.625)
30.00 285 100 6.800 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.280
0.280
0.280
8
(8.625)
40.00 285 100 8.800 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.322
0.322
0.322
10
(10.750)
50.00 285 100 11.00 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.365
0.365
0.365
12
(12.750)
60.00 285 100 13.05 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.375
0.375
0.375
14
(14.00)
70.00 285 100 14.35 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.375
0.375
0.375
16
(16.00)
128.00 285 100 16.40 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.280
0.280
0.280
24
(24.00)
192.00 285 100 24.6 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.322
0.322
0.322
Notes:
1. Wall thickness calculations take the following into consideration:
** 12.5% loss in thickness due to pipe manufacturing mill tolerance
** 8% loss in thickness incurred during bending
** Maximum allowable pipe diameter
2. Approval for the use of materials having wall thicknesses greater than specified in the table must be approved in writing by COMPANY.
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PT. PHE ONWJ Piping Fabrication, Installation And Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 19 of 22
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Table 2 Available Material Selections for Piping Bends (ANSI B31.3) Piping Specification Class "B" ANSI 300#
NOMINAL PIPE
DIAMETER
PIPE BEND
RADIUS
DESIGN
PRESSURE
DESIGN
TEMPERATURE
MAXIMUM
ALLOWABLE PIPE
DIA. AFTER
FORMING
MATERIAL TYPE NOMINAL WALL
THICKNESS (See
note 1)
(OD-inches) (inches) (psig) (
o
F) (inches) (inches)
6
(6.625)
30.00 740 100 6.800 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.280
0.280
0.280
8
(8.625)
40.00 740 100 8.800 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.322
0.322
0.322
10
(10.750)
50.00 740 100 11.00 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.365
0.365
0.365
12
(12.750)
60.00 740 100 13.05 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.375
0.375
0.375
14
(14.00)
70.00 740 100 14.35 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.375
0.375
0.375
16
(16.00)
128.00 740 100 16.40 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.375
0.375
0.375
24
(24.00)
192.00 740 100 24.6 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.688
0.688
0.688
Notes:
1. Wall thickness calculations take the following into consideration:
** 12.5% loss in thickness due to pipe manufacturing mill tolerance
** 8% loss in thickness incurred during bending
** Maximum allowable pipe diameter
2. Approval for the use of materials having wall thicknesses greater than specified in the table must be approved in writing by COMPANY
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PT. PHE ONWJ Piping Fabrication, Installation And Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 20 of 22
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Table 3 Available Material Selections for Piping Bends (ANSI B31.3) Piping Specification Class "D" ANSI 600#
NOMINAL PIPE
DIAMETER
PIPE BEND
RADIUS
DESIGN
PRESSURE
DESIGN
TEMPERATURE
MAXIMUM
ALLOWABLE PIPE
DIA. AFTER
FORMING
MATERIAL TYPE NOMINAL WALL
THICKNESS (See
note 1)
(OD-inches) (inches) (psig) (
o
F) (inches) (inches)
6
(6.625)
30.00 1480 100 6.800 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.432
0.432
0.432
8
(8.625)
40.00 1480 100 8.800 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.406
0.406
0.406
10
(10.750)
50.00 1480 100 11.00 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.500
0.500
0.500
12
(12.750)
60.00 1480 100 13.05 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.687
0.687
0.687
14
(14.00)
70.00 1480 100 14.35 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.750
0.750
0.750
16
(16.00)
128.00 1480 100 16.40 API-5L GR.B
ASTM A-53 GR.B
ASTM A106 GR.B
0.843
0.843
0.843
24
(24.00)
192.00 1480 100 24.6 ASTM A-53 GR.B
ASTM A106 GR.B
1.218
1.218
Notes:
1. Wall thickness calculations take the following into consideration:
** 12.5% loss in thickness due to pipe manufacturing mill tolerance
** 8% loss in thickness incurred during bending
** Maximum allowable pipe diameter
2. Approval for the use of materials having wall thicknesses greater than specified in the table must be approved in writing by COMPANY
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PT. PHE ONWJ Piping Fabrication, Installation And Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 21 of 22
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1 1
1.8 D t
1.8 D t
2 2
SHADED AREAS TO BE HEAT TREATED
D NOMINAL O.D OF MAIN PIPE
D NOMINAL O.D OF BRANCH PIPE
t THICKNESS OF MAIN PIPE
t THICKNESS OF BRANCH PIPE
1
2
1
2
Figure 1 Local heat treatment for branch connections
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PT. PHE ONWJ Piping Fabrication, Installation And Testing Specification
PHEONWJ-M-SPE-0021 Rev. 1 Page 22 of 22
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90
TYPE A
60
TYPE B
30
TYPE C
ALL PIPE SIZES
THESE
ANGLES
SHALL BE
EQUAL
BACK WELD
TO BE
APPLIED ON
ALL JOINTS
L
L
60
MINIMUM
45 MIN.
LONGITUDINAL SEAMS TO BE
STAGGERED BY 90 DEGREES
DIMENSION L REFER TO
PARAGRAPH 328.5.7
:
BUTT
JOINT
LAP OR SLEEVE
JOINTS SHALL NOT BE
USED WITHOUT THE
APPROVAL OF BP.
L
L
WELD NECK
FLANGE
SLIP-ON FLANGE
(HUB OR PLATE TYPE)
SECTION AT THROAT
OF BEND
OVER 30 DEGREES
1 SEGMENT
DN 350 (NPS 14) & OVER
OVER 60 DEGREES
2 SEGMENTS
DN 350 (NPS 14) & OVER
Figure 2 Segmental bending
LAP OR SLEEVE JOINTS SHALL NO BE
USED WITHOUT THE COMPANY
APPROVAL
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