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B53Z-1F

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-35*

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* - materials shall be impact tested by Sharpy method at minus 35°C (3kgf*m/cm2 for carbon steel)

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0103 latest ed.

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(8)

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(8)

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(8) - The bolting thread shall be standart ISO, i.e. metric

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0103 latest ed.

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NCP

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NCP

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Линия

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NCP

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0103 latest ed.

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(9)

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NCP

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NCP

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(9)

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(9) - The bolting thread shall be standart ISO, i.e. metric

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NCP

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NCP

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0103 latest ed.

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Process licensing

PIPING MATERIAL SPECIFICATION Job Number Unit Type Page

06-2872 100, 200 & 300

3PI 13/14

Client : JSC MOZYR OIL REFINERY - MOZYR – BELARUS Date By Check By Rev

HEAVY RESIDUE HYDROCRACKING COMPLEX 28/04/11 NAI NAI 0 Unit : H-OIL REACTION SECTION AND CATALYST HANDLING 15/07/11 NAI NAI 1 Service : Special Piping Material Specification for sections 100, 200 & 300 15/02/14 NAI NAI 2

06-2872 Piping Material iss_2

PIPING MATERIAL SPECIFICATION – L2-25C SERVICE : EBULLATING PUMP SEAL OIL

FLANGE RATING : 2500 ASME B16.5 TEMP. LIMITS : -29ºC to + 260ºC

MATERIAL : AUSTENITIC S.S. (TYPE 304 )

CORROSION ALLOWANCE : 1.5mm ITEM : PIPE

(3)

NPS

DN DESCRIPTION STANDARDS & CODES to 2” 50 SCH 160 SEAMLESS STAINLESS STL,

DIMENSIONS AS PER ASME B36.10, PLAIN ENDS (7)

ASTM A312 TP304

3” 80 SCH 160 SEAMLESS STAINLESS STL, DIMENSIONS AS PER ASME B36.10, BEVELED ENDS AS PER ASME B16.25 (7)

ASTM A312 TP304

V A L V E S

GATE (4) to 2 to 50 USE GLOBE VALVES

CHECK (2) to 2” to 50 2500 Forged S.S., S.W.E. CRANE YFW – 3974U – W or equal

ASTM A182 GR F304

GLOBE (2, 4) to 2” to 50 2500 Forged S.S., S.W.E. CRANE YFW – 3974U – W or equal

ASTM A182 GR F304

F I T T I N G S

SOCKET WELD (5)

to 2” to 50 9000 Forged Steel DIMENSIONS AS PER ASME B16.11

ASTM A182 F304

BUTT WELD (6) 3” AND UP 80 AND UP WALL THICKNES TO MATCH PIPE, SML’S DIMENSIONS AS PER ASME B16.9, BUTT WELDING ENDS AS PER ASME B16.25

ASTM A403 WP304

NIPPLES to 2” to 50 SCHEDULE Same as pipe, DIMENSIONS AS PER ASME B36.19

ASTM A312 TP304

SWAGES to 4” to 100 WALL THICKNES TO MATCH PIPE, SML’S, DIMENSIONS AS PER MSS SP-95.

ASTM A403 GR WP304

GRAYLOC CONNS. OR EQ.

ALL SIZES HUBS – (See Note 1) (See Note 1)

ALL SIZES CLAMP – (See Note 1) (See Note 1)

GASKETS ALL SIZES Seal Ring – See Note 1 (See Note 1)

BOLTING ALL SIZES Alloy Steel Stub Bolts (See Note 1)

W/ 2 Spherical Nuts (See Note 1)

NOTES: 1. See Table.

2. All socketwelds shall be examined by P.T. 3. Max. pressure / temperature rating is 19 770 kPa(g) @ 157ºC. Design pressure to be confirmed by vendor, after ebullating seal oil pump selection. 4. ”Y” pattern globe valve. 5. Use weldolet type fittings. 6. All butt welds shall be 100% radiographic inspected. 7. EPC contractor to confirm that pipe thickness is adequate for design conditions.

Process licensing

PIPING MATERIAL SPECIFICATION Job Number Unit Type Page

06-2872 100, 200 & 300

3PI 14/14

Client : JSC MOZYR OIL REFINERY - MOZYR – BELARUS Date By Check By Rev

HEAVY RESIDUE HYDROCRACKING COMPLEX 28/04/11 NAI NAI 0 Unit : H-OIL REACTION SECTION AND CATALYST HANDLING 15/07/11 NAI NAI 1 Service : Special Piping Material Specification for sections 100, 200 & 300 15/02/14 NAI NAI 2

06-2872 Piping Material iss_2

GRAYLOC CONNECTORS OR EQUAL

ASME CLASS 2500 L2-25C

PIPE SIZE

PIPE MAT’L

PIPE THK (6)

PIPE BORE (mm)

HUB MAT’L

SEAL RING SIZE

SEAL RING MAT’L

CLAMP SIZE

CLAMP MAT’L

STUD MAT’L

NUT MAT’L

25 A312 TP 304

160 S.S. 20.70 A182 F304

(3) A638 Gr 660

(3) A182 F304 A193 GR B8M

A194 GR 8M

40 A312 TP 304

160 S.S. 33.98 A182 F304

(3) A638 Gr 660

(3) A182 F304 A193 GR B8M

A194 GR 8M

50 A312 TP 304

160 S.S. 42.85 A182 F304

(3) A638 Gr 660

(3) A182 F304 A193 GR B8M

A194 GR 8M

80 A312 TP 304

160 S.S. 66.65 A182 F304

(3) A638 Gr 660

(3) A182 F304 A453 GR 660A

A453 GR 660A

DETAIL OF GRAYLOC:

NOTES : 1. ASTM standard for Pipe Material, Hub Material, Clamp Material, Stud Material, and Nut Material.

2. All connectors shall have shrouded bore to match the pipe I.D. When connecting to lighter weight pipe, the

hub shall be chamfered on a 3:1 taper to match the lighter pipe wall thickness.

3. Clamp manufacturer should select clamp and seal ring size based on the design conditions.

4. Seal ring shall have maximum hardness of 35 Rockwell C (NACE MR0175).

5. Seal ring to be supplied coated with MoS2, thermally cured

6. EPC contractor to confirm that pipe thickness is adequate for design conditions.

STANDARD MATERIAL SPECIFICATIONS Réf. Rév. Page

IN-043 1.1 1/14 AC

This document contains confidential proprietary material belonging to Axens which may only be made available to personnel or organizations who have signed appropriate secrecy agreements.

IN-MOD.dot / Rév. 5 du 19.03.2010 IN-043-1.1 Std material spec for wet H2S service.doc

STANDARD MATERIAL SPECIFICATIONS FOR

WET H2S SERVICES

Application to Carbon Steels

(IN-043)


IN-043 1.1 2/14 AC



Table of Content

1. SCOPE ...........................................................................................................................4

2. REFERENCE CODE AND DOCUMENTS......................................................................5

3. PROCUREMENT............................................................................................................6

4. TYPICAL FORMS OF DAMAGE....................................................................................7

4.1 Sulphide Stress Corrosion Cracking (SSCC).........................................................7 4.2 Hydrogen Blistering, Hydrogen Induced Cracking (HIC, SOHIC) ..........................7

5. WET H2S RESISTANT STEELS (CATEGORY 1) ..........................................................9

5.1 Wet H2S Resistant Carbon Steel for plates and welded pipes..............................9 5.2 Wet H2S Resistant Carbon Steel for seamless piping and tubing.......................10 5.3 Wet H2S Resistant Carbon Steel for flanges, fittings and accessories ...............10

6. HIC RESISTANT STEELS (CATEGORY 2).................................................................12

6.1 HIC Resistant Carbon Steel for plates and welded pipes....................................12 6.2 HIC Resistant Carbon Steel for piping and tubing ...............................................13 6.3 HIC Resistant Carbon Steel for flanges, fittings and accessories........................13


IN-043 1.1 3/14 AC



GENERAL COMMENTS

The information given hereafter for Carbon Steels operated under sour services results from Axens/IFP experience in the field of refining units operated under wet H2S conditions. For instance, these specifications should be typically applied for pressure vessels, piping and accessories used under sour services like wet H2S conditions.

The data given here are defined in the aim at giving an appropriated quality and safety level for the equipments operated under pressure. Specific codes, as well as Final User, Owner of equipment and Engineering Contractor standards may also influence the choice in materials and methods. It shall be noted that, in case of interference, in the project frame, between the present specification and others (ex: issued by Owner and/or Engineering), or codes, etc, the more stringent criteria will have to be considered.


IN-043 1.1 4/14 AC



1. SCOPE That standard document specifies Axens requirements on carbon steels for equipments (vessels, piping, valves, etc,...) handling fluids containing free water and hydrogen sulfide inducing sour service conditions.

Appropriated rules described here after have to be applied when Axens, datasheet of equipment or tag numbering for piping calls for “wet H2S resistant steels” or “HIC resistant steels” as well.

The current specification is additional to basic requirements mentioned for carbon steels in Axens IN-042.0 specification. In particular, if the sour service is combined with low temperature conditions, the carbon steel specification must comply with criteria of IN-042.0 (LTCS) supplemented with criteria of the current document.

Note: HIC stands for Hydrogen Induced Cracking. See §4.2 page 7.


IN-043 1.1 5/14 AC



2. REFERENCE CODE AND DOCUMENTS ASME Section II, Part A Ferrous Material Specifications, 2007, 2008a Addenda

EN 10028 Part 2 & 3 (2003) Flat products made of steels for pressure purposes.

EN 10222 Part 2 & 4 (2000) Steel forgings for pressure purposes.

EN 10216 Part 2 & 4 (2002) Seamless steel tubes for pressure purposes.

EN 10213 (2007) Steel castings for pressure purposes.

EN 10253 Part 2 (2009) Butt-welding pipe fittings.

Material Requirements for Sulfide Stress Corrosion Cracking Resistant Metallic Material

NACE Standard MR0175/ISO15156, 2003, Corrigendum 2005.

Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining

Environments

NACE Standard MR0103, 2007.

Materials and Fabrication Practices for New Pressure Vessels Used in wet H2S Refinery

Service

NACE International Publication 8X194, 1994.

Methods and Control to Prevent In-Service Environmental Cracking of Carbon Steel

Weldments in Corrosive Petroleum Refining Environments.

NACE Standard RP0472, 2005.


IN-043 1.1 6/14 AC



3. PROCUREMENT These kinds of steels shall not be considered like standard carbon steels within the project framework but shall be cautiously considered by taking into account their technical specificities.

Materials complying with “wet H2S resistance” requirements (category 1) of this specification are standard carbon steels with limited levels of impurities. To be noted: P275NL2 as EN 10028-3 for plates and P235GH, P265GH as EN 10216-2 for piping and tubing, can be used without any additional requirement.

Materials complying with “HIC resistance” requirements (category 2) must be produced specifically for this purpose, and be tested with dedicated procedure. Required levels of impurities are far below levels indicated by standard specifications of materials (ASTM or EN).

Some steel producers are able to supply HIC resistant plates according to their own standards. Among them, Axens considers that DICREST 5 of Dillinger Hütte GTS (Germany) and CarElso60HIC, CarElso65HIC of Industeel (Belgium and France) fulfill the requirements of this specification. It must be noted that for both, guarantee of HIC resistance requires a final PWHT of whole welded construction.

Project people should consequently be aware about this specificity at the very beginning of the project in the aim at anticipating the appropriated requirements dedicated to those steels.


IN-043 1.1 7/14 AC



4. TYPICAL FORMS OF DAMAGE (see also Axens General Statement about Materials of Construction IN45) H2S dissociation in presence of free water leads to atomic hydrogen formation (particularly in the cold part of the reaction section of hydrotreatment unit after the washing water injection in the reactor effluent, H2S amine absorbers and strippers overhead equipment are concerned), and can cause several kind of damages.

4.1 Sulphide Stress Corrosion Cracking (SSCC)

Hydrogen atoms affect resistance of the steel and result in what is generally termed as hydrogen embrittlement. SSCC is very dependent on the stress level of the steel. Cracking is in weld or HAZ (Heat Affected Zone) in the base metal adjacent to welds. This is where high strength / low ductility microstructures may be present and can be identified by high hardness.

This type of corrosion can appear very quickly and is not linked to the equipment thickness.

In order to limit this risk, a Post Welded Heat Treatment will temper the microstructure and then will reduce the residual stresses. This type of treatment is mandatory.

4.2 Hydrogen Blistering, Hydrogen Induced Cracking (HIC, SOHIC)

In this type of phenomena, hydrogen atoms are collected at imperfections or non-homogeneities in the microstructure. It occurs throughout the base material and typically does not occur in the weld metal. The interface between the inclusion and the steel matrix acts as a site for the hydrogen atoms to combine into hydrogen gas (H2). The hydrogen molecular gas is too large to diffuse back through the steel and is trapped. As more hydrogen gas collects at the said interface, it builds up the pressure and can cause yielding of the surrounding steel, which yielding creates lamination-type internal cavities parallel to steel surface.

The control at low content of impurities allows to reduce this risk.

HIC is stepwise internal cracks that connect adjacent hydrogen blisters on different planes in the metal. No externally applied stress is necessary for the formation of HIC. It is commonly found in steels with high impurity level that have a high density of large planar inclusions, such as MnS, and/or region of segregated impurity and alloying elements in the steel.

In Stress Oriented Hydrogen Induced Cracking (SOHIC), the cracks are developed along the residual stress directions.


IN-043 1.1 8/14 AC



Axens uses to consider two different categories of dedicated specifications, depending on service severity, in the aim at limiting the likelihood of SSCC and HIC as well. These specifications are defined as follows:

• Category 1 “Wet H2S Resistant Steels” which mainly calls for hardness limitations into the steel and welds therefore acting on the SSCC phenomenon itself. This specification is applicable for pressure vessels, piping and all components (fittings, tubing and accessories) in contact with wet H2S.

• Category 2 “HIC Resistant Steels” shall verify the “Wet H2S resistant Steel” specification supplemented by some limitations on impurities content into the steel thus leading to ultraclean steels. This specification applies on pressure vessel and all components except seamless piping and tubing. Rolled and welded pipes shall be considered like pressure vessel parts.

The present specification does not indicate recommendations for material resistant to SOHIC damages for which special additional testing methods must be applied.


IN-043 1.1 9/14 AC



5. WET H2S RESISTANT STEELS (CATEGORY 1) Axens applies the following design requirements for Carbon Steel "wet H2S resistant”:

• Carbon steel must be fully killed Carbon Steel type.

• Hardness of the base metal shall be below 22HRC or 237HB.

• Ni content less than 1%.

• Carbon content shall be 0.20% maximum.

• CS base material shall be supplied in Normalized condition (or Quenched and Tempered), regardless of thickness.

• Typical limitation of Carbon Equivalent are the following:

- Ceq < 0.42% for thicknesses below 2”,

- Ceq < 0.45% for thicknesses above or equal to 2”,

With Ceq = C + Mn/6 + (Cr +Mo + V)/5 + (Ni + Cu)/15

These Ceq values are indicative and may be re-considered if needed regarding the used steel grade. In that case, new proposed values should be submitted to Engineering Contractor for approval.

• Thermal Stress Relieving (PWHT) required for whole equipment and for seamless piping welds as minimum, even if it is not required by code.

• Thermal Stress Relieving required for cold bend zones even if it is not required by code. Level of deformation may require recovery annealing to restore properties of steels.

• Hardness of the production welds shall be lower than 200HB. This value uses to be slightly lower than the one defined for base metal (22HRC or 237HB) in order to anticipate potential non-homogeneity of certain weld deposits.

5.1 Wet H2S Resistant Carbon Steel for plates and welded pipes

• As an example, a possible designation could be ASTM A 516 Gr 60 (or P275NH, P275NL1-NL2 according to EN 10028-3) provided that all the specifications given here-above are guaranteed and supplemented by following limitations:

- maximum allowable Phosphorus content 0.020%,

- maximum allowable Sulfur content 0.015%.

• Welded pipes shall fulfill the same requirements as for plates material.


IN-043 1.1 10/14 AC



5.2 Wet H2S Resistant Carbon Steel for seamless piping and tubing

• Small and medium size process piping and tubing for heat exchangers shall be seamless type.

• As an example for piping, a possible designation could be:

- ASTM A 106 Gr B,

- P235GH or P265GH could also be used according to EN 10216-2 A2,

provided that all the specifications given here-above are guaranteed and

supplemented by following limitation on impurities level:



• As an example for tubing, a possible designation could be:

- ASTM A 179,

- P235GH or P265GH according to EN 10216-2 A2,

supplemented by same limitation on impurities level as above mentioned for piping.

5.3 Wet H2S Resistant Carbon Steel for flanges, fittings and accessories

• As examples, acceptable designations could be:

- ASTM A 105 for forgings (P280GH could also be applicable according

to EN 10222-2),

- ASTM A 234 Gr WPB for fittings (P265GH from DIN EN 10253-2),

- ASTM A 216 WCB for castings (GP240GH could also be used according to

EN 10213)


supplemented by following limitations on impurities level:



Note: The final specification concerning the P and S impurities contents, during the call-for-bids, might be reviewed by the Engineering Contractor (based on its own standard if any) following its typical practice for “Piping in Sour Service”. In case of any discrepancy with the Axens specification, decision will be made under Engineering Contractor responsibility.


IN-043 1.1 11/14 AC



Remark 1: It is Axens use to maintain PWHT on carbon steel made piping parts. As a matter of fact, the PWHT is considered by Axens as being the only way to be absolutely sure about the hardness level limitation in the welded and HAZ zones.

However, the Contractor may sometimes decide to avoid the PWHT on piping parts by considering that the appropriated welding procedure will be properly defined and controlled in order to guarantee the specified hardness level after welding. In this case, representative welding procedure qualifications shall be carried out on purchased piping material for the whole project such as to cover each grade of piping material, each type of welds (i.e. fillet welds and butt welds), maximum thickness without PWHT, highest Ceq, controlled base metal chemistry, controlled weld metal chemistry, etc.

If it is considered, by the Contractor, that such qualified procedure will be properly followed for the whole piping product and thus guarantee fully achieved hardness restrictions, then the contractor may decide to avoid PWHT on piping parts. Decision shall be made under EPC responsibility.

Remark 2: In case of low temperature applications under sour service, dedicated carbon steel grades for plates, piping, flanges, fittings and accessories parts shall fulfill the same requirements as defined here-above plus the requirements linked to low temperature and described in IN-042.0 Axens document.


IN-043 1.1 12/14 AC



6. HIC RESISTANT STEELS (CATEGORY 2) It shall be noted that stresses have no influence on HIC phenomenon, however the material composition and structure do.

The most important factor to avoid HIC is the purity (cleanliness) and the homogeneity of the steel. The non-metallic inclusions as well as any sites where hydrogen recombination might occur (e.g. elongated MnS inclusions) must be kept at very low content.

In addition to the general recommendations relative to "wet H2S resistant steels”, when ”HIC resistant steel” is specified, the following requirements shall also be met:

• Carbon steel made by vacuum degassing process.

• Oxygen content less than 0.0025% (target being 0.0020%).

• It is required to pass the NACE standard TM0284-2003 (Evaluation of Pipeline and Pressure Vessels Steels for Resistance to Hydrogen-Induced Cracking) by using the acidified test solution A specified in NACE standard TM0177 (Laboratory Testing of Metals for Resistance to Sulfide Stress Cracking and Stress Corrosion Cracking in H2S environments) with:

Crack Length Ratio (CLR) ≤ 5 %

• Mill test reports shall include the values for the crack length ratio (CLR), crack sensitivity ratio (CSR) and crack thickness ratio (CTR) as defined in NACE standard TM0284 and also carbon equivalent (Ceq).

6.1 HIC Resistant Carbon Steel for plates and welded pipes

• As an example, a possible designation could be ASTM A516 Gr 60 (or P275NH, P275NL1-NL2 according to EN 10028-3) provided that all the specification given here-above are guaranteed and supplemented by following limitations:

- maximum allowable Phosphorus content 0.010% (target 0.008%)

- maximum allowable Sulfur content 0.002%

• Welded pipes, if any, shall fulfill the same requirements as for plate material.


IN-043 1.1 13/14 AC



6.2 HIC Resistant Carbon Steel for piping and tubing

• Basically, specification dedicated to the HIC resistant steels is not to be applied on process pipes or tubing for heat exchanger provided that these latter are seamless type. But HIC resistant requirement has to be applied on the whole piping if some forged or welded parts are present (flanges, connections, fitting...)

• It is Axens viewpoint to consider seamless piping or tubing as intrinsically immune against Hydrogen Induced Cracking phenomenon; only “H2S resistant” steel specification shall then be applied.

• However, welded pipe, if any, shall fulfill the same requirements as for plate material.

6.3 HIC Resistant Carbon Steel for flanges, fittings and accessories

• As examples, acceptable designations could be

- ASTM A 105 for forgings (P280GH could also be applicable according to EN

10222-2),

- ASTM A 234 Gr WPB for fittings (P265GH according to DIN EN 10253-2),

- ASTM A 216 Gr WCB for castings (GP240GH could also be used according to

EN 10213),


supplemented by following limitations on impurities level.:



• No HIC testing is required on casting and forging components.

Remark 1: To lower as much as possible the risk of potential cracking induced by hydrogen activity and to consider the steels as “HIC resistant steels”, Axens considers that it is mandatory to maintain, as a minimum, the whole here above specified requirements (including impurities content). Any deviation to the said Axens specification will be under the responsibility of the Engineering Contractor.

Moreover, a quality control only based on NACE testing (without appropriated cleanliness control) may lead to a “pseudo-HIC” steel. In contrast to HIC resistant plates, pseudo HIC plates are not originally produced to be HIC resistant but are steels produced using conventional production methods which may be subjected to HIC testing in laboratory. Good results can be obtained but these are not representative of the whole plate and are only valid for the tested location. Homogeneous, constant HIC resistance can only be obtained if the entire plate production is consistently adapted to meet HIC resistance requirements. If not, the steels will not be considered as HIC resistant steels by Axens.


IN-043 1.1 14/14 AC



Remark 2: The final specification concerning the different impurities contents, during the call-for-bids, might be reviewed by the Engineering Contractor (based on the owner specification if any) following its typical practice for “HIC resistant steels”. In case of any discrepancy with the Axens specification, decision will be taken under Engineering Contractor responsibility.

Remark 3: In case of low temperature applications under sour service, dedicated carbon steel grades for plates, piping, tubing, flanges and accessories parts shall fulfill the same requirements as defined here-above plus the requirements linked to low temperature and described in IN-042.0 Axens document.

Remark 4: The use of a plain carbon steel grade (as defined per IN-042.0) with stainless steel (SS) cladding can be an alternative to “HIC resistant steels” specification especially for thick-wall vessels like cold HP separator since it should involve only a small cost premium over “HIC resistant steel” construction (the procurement in case of weld overlay could even be sometimes more easy). The resulting protection against corrosion would be enhanced provided that the choice of SS would not lead to other kind of corrosion and/or deterioration.

To be noted also that the low alloyed Cr-Mo steels frequently used for pressure vessels have no intrinsic resistance to corrosion occurring in sour services. In such a case, a SS cladding (SS304L, SS321) or weld overlay (SS308L, SS347) has to be applied on Cr-Mo low alloy steel base material.

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