requirements for fasteners and gaskets

1/31/15 Requirements for Fasteners and Gaskets

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Home Introduction Requirements for Fasteners and Gaskets

Requirements for Fasteners and Gaskets

Requirements for Fasteners

1. The diameters and lengths of stud bolts shall conform to standards ASME B16.5 (for flanges 24 and

smaller), ASME B16.47 Series A/MSS SP 44 (for flanges 26 and larger) and ASME B18.2.1.

2. For stud bolts the diameter shall be specified in inches and lengths in millimeters.

3. All nuts shall be of heavy hexagonal type and shall be in accordance with ASME B18.2, except where

modified by this specification.

4. Stud bolt lengths shall be the effective thread length excluding the end points, in accordance with ASME

B16.5. The lengths mentioned in the requisition are service lengths that do not include the dimensions of

the end bevel.

5. If the nuts of grade 4 or 7M are specified in the material requisition, then the supplementary

requirements S3 specified in ASTM A194 shall apply. Impact test temperature and test values shall be as

per A 320 respective grade.

6. All Fasteners specified for sour service shall meet the requirements of NACE MR0175/ISO 15156 latest

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edition.

7. Where specified bolting shall be galvanized in accordance with ISO 1461. Thread fits shall be class 2A

for bolts and class 2B for nuts after galvanizing.

8. Vendor shall propose measures if any to be taken to prevent the risk of galling between high alloys bolts

and nuts.

9. For stud bolts, jackscrews and nuts, the threading shall conform to the following series of standard

ASME B1.1.

1. Coarse series: for bolt diameters less than or equal to 1

2. 8 threads series: for bolt diameters equal to or greater than 1

10. Stud bolts shall be threaded along their entire length. The machining and surface condition tolerances

applicable to the various threading shall conform to the following classes:

1. Class 2A of standard ASME B1.1 for stud bolts and screws

2. Class 2B of standard ASME B1.1 for nuts

11. Unless otherwise specified, hydraulic bolt tensioning shall be applied as given in the table below. For

such instances, the bolt lengths specified in the Inquiry / Purchase Requisition includes additional length

(minimum one bolt diameter) and the bolts shall be supplied with 3 nuts.

SERVICE ASME RATING

CLASSES

BOLT

DIAMETER

All 150# to 900# 2

All 1500# and above 1 1/2

12. Bolting items shall be supplied with a suitable rust preventive (e.g. Shell Ensis Fluid or equal).

13. Negative tolerance is not permitted on the length of the bolting.

14. In addition to the marking requirements of the relevant product codes and standards, the stock code

number, purchase order number and purchase order item number shall be printed on each box or

package.

Requirements for Gaskets

1. Gaskets shall conform to the following standard, except where modified by this specification.ASME

B16.20 for spiral wound and ring type gaskets.ASME B16.21 for flat ring gaskets.

2. Gaskets shall be suitable for installing between ASME B16.5 flanges for sizes up to 24 and ASME B16.47

series A / MSS SP 44 flanges for sizes greater than 24.

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3. The flat ring gaskets shall be basically manufactured out of soft non-metallic materials in the form of flat

sheets and shall only be used typically in low to medium pressure general services.

4. Asbestos shall not be used for non-metallic gaskets or part of metallic gaskets. Use of asbestos in any

form is strictly prohibited.

5. The flat ring gaskets shall be made of resilient or pliable materials such as rubber, Aramid fibre, PTFE,

reinforced PTFE, graphite suitably reinforced, mica, etc.

6. The flat ring gaskets shall not be used for RTJ type flanges, or male/female type flanges, or tongue and

groove type flanges.

7. Spiral wound gaskets shall be provided with inner and outer rings in compliance with ASME B16.20.

8. The materials of the spiral wound gasket components e.g. filler, windings, outer and inner rings, shall be

as specified in the Material Requisition. The windings and the inner rings shall always be made from

type 316 stainless steel or higher grade.

9. Where gaskets components made from austenitic stainless steel to ASTM A240 Gr 316L are specified,

the product shall be in a solution annealed condition, before assembly.

10. Flange gasket contact surface finish shall be in accordance with ASME B16.5.

11. The ring type gaskets shall have a maximum Brinell hardness as specified below:

Gasket Material Maximum Hardness (HB)

Soft Iron 90

Alloy Steel 130

18/8 Stainless Steel 135

Alloy 625 180

Alloy 825 160

6% Mo 160

12. Graphite based gaskets or where this material is used for filler material in spiral wound designs shall be

suitable for temperatures up to 400 C.

13. In addition to the marking requirements of the relevant product codes and standards, the stock code

number, Purchase Order number and Purchase Order item number shall be marked on each package.

14. All Gaskets specified for sour service shall meet the requirements of NACE MR0175/ ISO 15156 latest

edition.

15. All spiral wound gaskets in class 150 shall be of low density (low stress) type which are designed to seat

at lower bolt loads.

Requirements for Insulating Gasket Kits

1. Insulating gasket kits shall be to manufacturers standard, with each kit comprising of:

1. 3mm thick flat ring insulating

2. gasket to ASME B16.21, material shall be Neoprene reinforced Phenolic/manufacturers standard

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material.

3. Full length insulating sleeves (1 sleeve per bolt); material shall be

Polyethelene/Phenolic/Mylar/manufacturers standard material.

4. Insulating washers 3mm thick (2 washers per bolt), material shall be Reinforced Phenolic material

5. Steel back-up washers 3mm thick (2 washers per bolt).

2. Insulating gasket kit (including bolt sleeves and washers) material should be of high insulating quality

that should, in addition to protecting flanges from corrosion, meet the pressure/temperature

requirements of the system.

3. The bore of the insulating gasket should be equal to the pipe bore. This will prevent any service material

from accumulating in the annular space between the bore of the gasket and the bore of the pipe thus

preventing formation of electrical bridge.

4. Insulating gasket should be suitable for the intended flange class, the maximum pressure and

temperature conditions of system and service fluid.

Inspection and Testing

1. Fasteners and gaskets shall be inspected and tested in accordance with the relevant product codes and

standards, Purchase Requisition and as stated in this specification.

2. The Vendor is responsible for informing the Contractor about the availability of goods for inspection and

testing.

3. Examinations and/or tests may be reviewed and/or witnessed by the Contractor or their authorized third

party inspector at the Vendors facility.

4. Fasteners and gaskets shall be tested in Vendors works and test certificates shall be provided as per the

Supplier Data Requirement List (SDRL).

5. Vendor shall submit the certificate of conformity of the material duly certified by Inspector. Type

approval testing certificates for gaskets, where required shall be submitted. In this certificate the

manufacturer shall confirm that the supplied product has passed type approval testing in accordance

with requirements of relevant standards.

6. Inspection shall be performed as per Vendor Quality Requirement form attached with the Inquiry /

Purchase Requisition.

7. Fasteners which are specified as for low temperature service shall be impact tested as specified in the

Material Requisition.

8. Positive Material Identification (PMI) shall be conducted for all SS / DSS / CRA alloy fasteners and

gaskets in accordance with the PMI standards/specifications applicable to the project.

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1. The marking shall be done in accordance with the standards/specifications for marking applicable to the

project and the relevant product codes and standards.In addition, the stock code number, purchase

order number and purchase order item number shall be marked on each box or package.

2. Colour coding shall be done based on the material categories as identified in accordance with the

standards/specifications for colour coding applicable to the project.

Packing and Preservation

1. Corrosion prevention and packaging shall be in accordance with the minimum requirements as stated in

this specification. However the responsibility remains with the Vendor to apply equal or more suitable

protection and / or packing to ensure safe arrival of the fasteners and gaskets at their ultimate

destination.

2. Each gasket shall be free from sharp edges, burrs, organic substances (e.g. grease, oil, lubricants,

sealants and preservatives), rust, dirt or any other foreign particulate matter. The filler material shall be

free from blisters, crack or other surface imperfections e.g. porosity, voids, inclusions or other defects

which could impair satisfactory performance.

3. Bolting items shall be supplied with suitable rust preventive.

4. Fasteners and gaskets shall be packed in such a manner so as to avoid damage or atmospheric

corrosion to inside or outside surfaces or parts, during storage or while in transit. All bolting shall be

supplied assembled with nuts.

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