Element Data Sheet for Body/Bonnet Bolting for Valves

Title / Doc.no. / Operator / Sec.no. /
Piping and Valve Specification / 5060 / 4
Project / Rev.no. / Rev.date / Page: / Of:
Element Data Sheet: / NBO2 / 03 / 01.10.10 / 1 / 2

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.

Valve material / Bolt material / MDS Ref.
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. / C100
(1)
316 SS / ASTM A 320 gr. B8M Cl.1 or Cl. 2 / ASTM A 194 gr. 8M. / S03
Alternative 1: ASTM A 453 gr. 660 A with documented satisfactory impact toughness at –101°C. / S66
22Cr Duplex / ASTM A276 UNS-S31803, 22Cr duplex according to MDS D47X / D47X
Alternative 1: ASTM A 453 gr. 660 A with documented satisfactory impact toughness at –101°C. / S66
25 Cr. Duplex / ASTM A276, 25 Cr. Duplex according to MDS D57X / D57X
Alternative 1: ASTM A 453 gr. 660 A with documented satisfactory impact toughness at –101°C. / S66
6Mo / ASTM A276, 6Mo according to MDS R17 / R17
Alternative 1: ASTM A 453 gr. 660 A with documented satisfactory impact toughness at –101°C. / S66
Alternative 2: ASTM 468 Ni 625 (UNS N06625) according to MDS N03 / N03
Titanium / ASTM F 467/468 gr. 5. / T03
Alternative 1: ASTM A 453 gr. 660 A with documented satisfactory impact toughness at –101°C. / S66

Note 1. Bolts with diameter < 10mm shall be ASTM A456 gr. 660 according to MDS S66.

B) General requirements to Valve Bolting

1. Dimensions and shape

Bolts:

Threading shall be in accordance with ASME 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 ASME 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 ANSI heavy HEX. series, double chamfered. Dimensions shall conform to ASME B18.2.2.

2. Hardness

Hardness shall be tested and maximum hardness shall not exceed 35 HRC or 328HB.

3. Surface protection

All low alloyed steel bolts, nuts and washers shall be hot dipped galvanized according to ASTM A153 or ISO10684.

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.

4. Valve design rules for bolting

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.

5. Certification

The material manufacturer shall have a quality system certified in accordance with ISO9001 and the system shall have undergone a specific assessment for the relevant materials.

The material certificate shall be in accordance with EN10204 as follows:

Studs grades B7/B16 and nuts gr.2H, gr.7 (-29degC): type 2.2

Studs grades L7/L43 and nuts gr.4, gr.7: type 3.1

Other materials: type 3.1