| Customization: | Available |
|---|---|
| Media: | Water,Oils,Gas,etc |
| Material: | Stainless Steel |
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BS 5351 Ball Valves: trunnion mounted ball valves or seat-supported ball valves are available in one-piece or split-body construction, with full or reduced bore.
Straightway steel ball valves have specified wall thickness, an antistatic feature, and a fire-tested design.
BS5351: Steel ball valves for the petroleum, petrochemical, and allied industries.
BS 5351 Standard specifies the valve seat and body pressure/temperature ratings and the design, including materials, dimensions, operation,performance, testing, and marking of ball valves.
Flanged-end valves
Flange dimensions shall comply with BS 1560-2 for Class rated valves or BS 4504-1 for PN rated valves.
Face-to-face dimensions shall be in accordance with BS 2080. Valves having flanges complying with BS 4504-1 with nominal pressure (PN) ratings as given in Table 5 shall have the same face-to-face dimensions as valves with flanges of the
corresponding class ratings. The applicable nominal size range is also given.
Butt-weld-end valves
End-to-end dimensions shall be in accordance with:
a) Table 6 for PN 10, PN 16, Class 150 and PN 25, PN 40 and Class 300 valves;
b) BS 2080 for Class 600 valves.
NOTE- The details for the weld preparation for butt-weld-end valves are not a requirement of this standard but attention is
drawn to Appendix B which gives details of various weld-end preparations and it is incumbent upon the purchaser to specify a particular weld-end preparation, if required (see Figure 3 and Figure 4).
Socket-weld-end valves
Socket-weld-end dimensions shall be as given in Table 7.
Extended-weld-end valves
The overall length of weld-end valves when fitted with extended ends shall be 400 ± 1 mm; valves of nominal sizes DN 15 to DN 40 shall have ends square or prepared for welding.
NOTE - Valves of nominal size DN 50 should have bevelled ends in accordance with Appendix B which gives details of various weld-end preparations and it is incumbent upon the purchaser to specify a particular weld-end preparation, if required (see Figure 3 and Figure 4).
Table 9 - Minimum ball and body port diameters PN 10, PN 16, Class 150, PN 25, PN 40, Class 300, Class 600 and Class 800
| Nominal size | Minimum diameter (mm) | |||
| Reduced bore valves | Full bore valves | |||
| DN | Inch | PN10 up to and including PN40 and Class 150 to 800 | PN 10 up to and including PN 40 and Class 150 | Class 600 and 800 |
| 8 | 1/4" | 6 | 6 | 6 |
| 10 | 3/8" | 6 | 9 | 9 |
| 15 | 1/2" | 9 | 12.5 | 12.5 |
| 20 | 3/4" | 12.5 | 17 | 17 |
| 25 | 1" | 17 | 24 | 24 |
| 32 | 1-1/4" | 23 | 30 | 30 |
| 40 | 1-1/2" | 28 | 37 | 37 |
| 50 | 2" | 36 | 49 | 49 |
| 65 | 2-1/2" | 50 | 64 | 64 |
| 80 | 3" | 57 | 75 | 75 |
| 100 | 4" | 75 | 98 | 98 |
| 150 | 6" | 98 | 148 | 148 |
| 200 | 8" | 144 | 198 | 198 |
| 250 | 10" | 187 | 248 | 245 |
| 300 | 12" | 228 | 298 | 295 |
| 350 | 14" | 266 | 335 | 325 |
| 400 | 16" | 305 | 380 | 375 |
11 Pressure testing
All valves shall be pressure tested in accordance with BS 6755-1 and for the minimum test durations given in Table 14, and additionally:
a) the shell test shall be a hydrostatic test and there shall be no visually detectable leakage from the valve including the valve stem seals;
b) the seat test shall be either pneumatic or hydrostatic.
NOTE 1- If a particular type of seat test is required, i.e. pneumatic or hydrostatic, the purchaser should state the requirement in the enquiry and/or order (see Appendix A).
NOTE 2- The hydrostatic seat test is an optional test for soft seated ball valves. The purchaser should state any requirement for hydrostatic pressure tests on soft seated ball valves in the enquiry and/or order (see Appendix A).
NOTE 3- It should be noted that soft seated valves, when hydrostatically tested, might have a reduced performance capability in some subsequent services at low differential pressures. In these cases the manufacturer should be consulted.
c) the seat test acceptance level for all valves shall be leakage rate A, i.e. no visually detectable leakage.
If a production pressure test certificate is issued it shall contain a statement by the manufacturer confirming that the valves have been tested in accordance with this standard, and stating the actual pressures and medium used in the tests.
NOTE - If a test certificate is required this should be specified by the purchaser on the enquiry and/or order for the valves
(see Appendix A).
Table 14 - Pressure test durations
| Nominal valve size | Minimum test durations: hydrostatic or pneumatic |
||
| Shell test | Seat test | ||
| DN | Inch | minutes | minutes |
| ≤100 | ≤4 | 2 | 2 |
| 150≤250 | 6≤10 | 5 | 5 |
| 300≤400 | 12≤16 | 15 | 5 |
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