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I am very familiar with the codes you listed, plus some others for valve testing, including fire and fugitive emission testing. They do not require 3rd party witness for the tests. The customer decides if they are willing to find and pay someone to witness the test, and the manufacturer...

There is no "common practice" Some chose to take the valves apart to avoid melting the seals, and others chose to weld with the valve fully assembled. There are pros and cons for each. One place I worked initially demanded all socket weld valves be disassembled before welding. A high...

API 609 refers to APi 598 for pressure testing butterfly valves. Per API 598, all resilient seated butterfly valves are "no seat leakage" during the closure test. API 598 also states that triple-offset butterfly valves with laminate seats are to be considered resilient seated. So triple...

Most common standards for cold temperature testing are MSS SP-134 and ISO 28921-1. MSS SP-134 is referenced by ASME B16.34 and some API standards, including API 609 which is butterfly valves for the oil & gas industry. ISO 28921-1 was developed to replace BS 6364 as the BS standard is...

I looked at the 2020 edition. Paragraph 6.5.2 states tabulated stud bolt lengths, dimension "L" in Tables 31 through 41, are based on using 2 heavy hex nuts on two welding neck flanges. Other types of flanges including blind flanges may require different bolt lengths. Refer to nonmandatory...

The definition of double block and bleed varies by standard. API 6D has pressure coming from both ends of the valve simultaneously and there is a vent in the center body cavity to verify both seats are sealing. API 608 definition has the pressure direction from only one port, and both seats...

I think the item to focus on is the pressure in the line upstream and downstream from the valve. When you crack it open, you essentially have a fixed orifice size. If the flow rate is changing during this time, then the pressure upstream and downstream of the valve must be changing. This is...

Maybe MSS SP-110 could apply. Best to contact the manufacturer and ask.

It fails B16.34 if it is a steel valve. Other standards do exist. What type of valve? What is the body material?

Please read the standard again. Paragraph 6.1 says to use Table 3A, 3B OR Mandatory Appendix VI to determine minimum wall thickness. Appendix B is Nonmandatory and is for information only. I don't know what you mean by "design calculation". Wall thickness is simply looked up in Table 3A or...

ASME B16.34 does not provide information on how to calculate the thickness of the bonnet flange. It only provides instructions regarding the required area of the bonnet bolting. The valve designer must choose the method to determine the bonnet flange thickness. It could be any of the...

For small round parts, we use D&D Precision Machine in Massachusetts. Have been for a very long time.

You have the right paragraph for flanged valves. It is 6.2.2. It says, "Flanged ends shall be prepared with flange facing, nut-bearing surfaces, outside diameter, thickness, and drilling in accordance with ASME B16.5..." Flange facing is applicable nut-bearing surface is not applicable...

Please refer to paragraph 6.7 in ASME B16.34 for wafer or flangeless valves. Your monoflange valve appears to be this type of valve and if it complies with the requirements of paragraph 6.7, then it is within the scope of B16.34.

Can you just cut a solid round gasket from sheet which will completely block the media from touching the blind flange?

MSS SP-141, [i]Multi-Turn and Check valve Modifications, Section 5 gives instructions on thread removal to convert to socket weld for NPS 1/2 - 2, Classes 800, 1500 and 2500.

Just because a supplier or client is a friend does not necessarily mean there is a conflict of interest. I have some very close friends that were customers. We are still friends and get together occasionally to play golf, dinner, drinks, etc. after retirement. We genuinely share a lot of...

ASME B16.34 requires marking on the valve body as well as an identification plate. ASME B16.34 states marking shall comply with MSS SP-25.

Fire test pe API 607 is a type test. API 607 fire tests and the applicable certificate do not expire. There is nothing in the standard that states or dictates an expiration date. This date was made-up by the witness agency. The expiration date on the certificate is not relevant. If I was...

You should not compress disc springs beyond 70 to 80 % of their height. If the springs are scragged, then you know they can be compressed to 100% without breaking. However, the load vs. deflection curve increases significantly once you go above 70 to 80% compression. Above this range, the...