Global Supply Line Pty Ltd ABN 86 008 1 34 512 Head Office - 1 to 23 Barndioota Rd Salisbury Plain South Australia 5109 Ph +61 (0)8 8285 0000 Fax +61 (0)8 8285 0088 www.globalsupplyline.com.au ASME B16.34 VALVE TEST PRESSURES COMMON GRADES WCB/ A105/ LF2/ LF3 CLASS # CWP-PSI BODY TEST X 1.5 PSI SEAT TEST X 1.1 PSI 150 285 427.50 313.50. RE: ASME B16.34 - 2017 - Wall thickness for Multipiece valve NDS21 (Mechanical) 14 Mar 18 05:17 Hey I went through the standard and I got confused if designer picks the method and takes a min. Value for thickness then won't there be a problem for interchangeability of central core made by other manufacturers? ASME B free download ASME B pdf free download.Valves–Flanged, Threaded, and Welding End.The size of this pdf file is 47.1M.You can download it here.If you don’t mind,hope you share this website on your FB or other social platforms. ASME B applies to new construction.
ASME B16.34 - 2017 - Wall thickness for Multipiece valve
ASME B16.34 - 2017 - Wall thickness for Multipiece valve
Asme B16 34 2017 free. download full
Hi all,
I'm checking last rvision of B16.34 and I'm a little bit confused about Multipiece valve wall thickness.
In Paragraph 6.1.2 - c) it is stated:
“(c) For multipiece valve construction, where the body consists of a central core to which are affixed two end pieces, the inside diameter, d, is determined by only one of the following methods:
(1) in accordance with (a).
(2) for the end pieces, the value of d shall be in accordance with (a), and for the central core piece the value of d shall be the inside diameter of the core piece. For a core piece with axial holes, whether through- or partial-threaded, the inner and outer ligaments shall also meet the requirements of dimensions f and g in Figure 2. These ligaments shall be based upon the value of d for the core piece”.
This mean that for the core piece you can consider two very different values for d:
-if you apply method (1) you will consider a smaller diameter (based on the flow passage) and you will not take into consideration the ligaments for holes parallel to the body run (meaning at the end that no extra thickness is necessary)
-if you will apply method (2) you will consider a bigger diameter (means bigger value for thickness) and then you have to check that the sum of ligaments is at least equal to the minimum wall thickness (resulting in a thickness of the core part that is equal to the minimum wall thickness + stud size).
In conclusion, if the method (1) is acceptable for stating conformance to the standard, why one should choose method (2), leading to a much higher value for min wt? Am I missing something?
I'm checking last rvision of B16.34 and I'm a little bit confused about Multipiece valve wall thickness.
In Paragraph 6.1.2 - c) it is stated:
“(c) For multipiece valve construction, where the body consists of a central core to which are affixed two end pieces, the inside diameter, d, is determined by only one of the following methods:
(1) in accordance with (a).
(2) for the end pieces, the value of d shall be in accordance with (a), and for the central core piece the value of d shall be the inside diameter of the core piece. For a core piece with axial holes, whether through- or partial-threaded, the inner and outer ligaments shall also meet the requirements of dimensions f and g in Figure 2. These ligaments shall be based upon the value of d for the core piece”.
This mean that for the core piece you can consider two very different values for d:
-if you apply method (1) you will consider a smaller diameter (based on the flow passage) and you will not take into consideration the ligaments for holes parallel to the body run (meaning at the end that no extra thickness is necessary)
-if you will apply method (2) you will consider a bigger diameter (means bigger value for thickness) and then you have to check that the sum of ligaments is at least equal to the minimum wall thickness (resulting in a thickness of the core part that is equal to the minimum wall thickness + stud size).
In conclusion, if the method (1) is acceptable for stating conformance to the standard, why one should choose method (2), leading to a much higher value for min wt? Am I missing something?
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Valves ù Flanged, Threaded, and Welding End
This Standard applies to new construction and covers pressureûtemperature ratings, dimensions, tolerances, materials, nondestructive examination requirements, testing, and marking for cast, forged, and fabricated flanged, threaded, and welding end and wafer or flangeless valves of steel, nickel-base alloys, and other alloys shown in Table 1. Wafer or flangeless valves, bolted or throughbolt types, that are installed between flanges or against a flange are treated as flanged-end valves. Alternative rules for NPS 21/2 and smaller valves are given in Mandatory Appendix V.
Available for SubscriptionsAvailable in Packages- ASME B16. Fittings and Valves Package
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