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Title: |
Piping and Valves |
Doc. No. |
L-001 |
Annex |
C |
EDS |
NBO2 |
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Project: NORSOK |
Company: |
Rev.Date: |
20.09.99 |
Rev: |
1 |
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ELEMENT DATA SHEET FOR BODY/BONNET BOLTING FOR VALVES
A) Acceptable bolting materials
The table below lists acceptable materials for body/bonnet bolting. Where a MDS is referred to, the requirements on the MDS shall apply.
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Valve material |
Bolt material |
MDS Ref. |
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Carbon Steel |
ASTM A 193 gr. B7 (bolt) / A 194 gr. 2H (nut). ASTM A 320 gr. L43 bolts shall be used for dimensions > 2 ½ inch (65 mm). Low alloyed steel bolts nuts and washers shall be hot dip galvanized according to ASTM A 153. |
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316 SS |
ASTM A 320 gr. B8M Cl.1 or Cl. 2 / ASTM A 194 gr. 8M. |
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Alternative I: ASTM A 320 gr. L7 (bolts)/ ASTM A 194 gr.7 (nuts). ASTM A 320 gr. L43 bolts shall be used for dimensions > 2 ½ inch (65 mm). ASTM A 194 gr. 7 nuts shall be impact tested as for ASTM A 320 gr. L7 bolts. Low alloyed steel bolts nuts and washers shall be hot dip galvanised according to ASTM A153. |
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Alternative II: ASTM A 453 gr. 660 A with documented satisfactory impact toughness at –101°C. |
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22Cr Duplex |
ASTM A 193 gr. B7 (bolt) / A 194 gr. 2H (nut). ASTM A 320 gr. L43 bolts shall be used for dimensions > 2 ½ inch (65 mm). Low alloyed steel bolts nuts and washers shall be hot dip galvanized according to ASTM A 153. |
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Alternative I: ASTM A276 UNS S31803 may be used. |
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25 Cr. Duplex |
ASTM A 193 gr. B7 (bolt) / A 194 gr. 2H (nut). ASTM A 320 gr. L43 bolts shall be used for dimensions > 2 ½ inch (65 mm). Low alloyed steel bolts nuts and washers shall be hot dip galvanized according to ASTM A 153. |
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Alternative I: ASTM A276, 25 Cr. Duplex according to MDS D57 may be used. |
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6Mo |
ASTM A 320 gr. L7 (bolts)/ ASTM A 194 gr.7 (nuts). ASTM A 320 gr. L43 bolts shall be used for dimensions > 2 ½ inch (65 mm). ASTM A 194 gr. 7 nuts shall be impact tested as for ASTM A 320 gr. L7 bolts. Low alloyed steel bolts nuts and washers shall be hot dip galvanized according to ASTM A 153. |
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Alternative I: ASTM A 276, 6Mo according to MDS R17 may be used. |
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Alternative II: ASTM A 453 gr. 660 A with documented satisfactory impact toughness at –101°C. |
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Titanium |
ASTM F 467/468 gr. 5. |
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Alternative I: ASTM A 193 gr. B7 (bolt) / A 194 gr. 2H (nut). ASTM A 320 gr. L43 bolts shall be used for dimensions > 2 ½ inch (65 mm). Low alloyed steel bolts nuts and washers shall be hot dip galvanised according to ASTM A 153. |
B) General requirements to Valve bolting
Bolts:
Threading shall be in accordance with ANSI B1.1, class 2A fit for diameters 1 inch and smaller (UNC series) and 8 pitch thread series for 1 1/8 inch and larger
Nuts:
Threading shall be in accordance with ANSI B1.1, UNC series for diameters 1 inch and smaller with a class 2B fit, and 8 UN series for diameter 1 1/8 inch and larger with a class 2B fit.
Nuts shall be American national standard heavy HEX. series, double chamfered. Dimensions shall conform to ANSI B18.2.2.
All low alloyed steel bolts, nuts and washers shall be hot dipped galvanized according to ASTM A153.
Specified dimensions shall be met after galvanizing. The zinc coating on threads shall not be subjected to cutting, rolling or finishing tool operation.
Nuts may be tapped after galvanizing.
For valves that are required to comply with ASME B16.34, rules of par. 6.4. shall be complied with. Otherwise, allowable stress shall be evaluated according to ASME VIII div 1 or 2.
Where no MDS is referred to, certification shall be in accordance with EN10204 type 2.2.