Leakage level of control valve on/off valve

Has no one answered this question? I think everyone encounters it, right? The filling of the leakage level in the valve data sheets for petrochemical design is different from that in the valve data sheets for chemical engineering design

1. Standard descriptions: SH3005: HG20507. 2. Scope of application of the standards: API598 applies to various types of valves with elastic valve seats, non-metallic valve seats (such as ceramics), and intermetallic valve seats – including gate valves, plug valves, check valves, ball valves, and butterfly valves. GBT-13927 is based on ANSI FCI 70-2-2006; the leakage classification standards specified therein are intended specifically for control valves. The description of HG20507 is questionable. 3. Personal opinion: The leakage rate of the on-off valve should meet the requirements specified in GBT-13927 or API598. The specification sheets for valves in manufacturing processes are prepared in this manner. The valves are controlled by instruments, and the control valves meet the leakage standards specified by ANSI. Controlled by instruments, switch valves should meet the leakage requirements specified in GBT-13927 or API598; however, in practice, the specification sheets specify leakage levels according to ANSI standards. It can be discussed with the designers.

I have read all these specifications. Generally, for chemical engineering projects, HG standards are followed; however, for any valves used in such projects, ANSI standards are applied. In SH-related projects, the connections are usually made within the same complex. I don’t have any experience in this area, but now some provinces require that instrument selection be carried out in accordance with SH standards for rectification and design purposes. There are certain differences between these two sets of standards, which is indeed confusing

I have read all these specifications. Generally, for chemical engineering projects, HG standards are followed; however, for any valves used in such projects, ANSI standards are applied. In SH-related projects, the connections are usually made within the same complex. I don’t have any experience in this area, but now some provinces require that instrument selection be carried out in accordance with SH standards for rectification and design purposes. There are certain differences between these two sets of standards, which is indeed confusing

The ANSI standard specifies that a control valve is one equipped with a positioner, allowing the valve to be controlled to any desired position; in other words, it is what we refer to as a control valve. It was also mentioned that for isolation and complete severance, API 598 is recommended. API 598 seems to include additional requirements regarding leaks in the valve body and valve cover, whereas ANSI specifies requirements only for seat leaks. The test pressures for leaks specified in API 598 differ from those for control valves. In my opinion, for on-off valves, API 598 should still be followed

1. 598 involves manually tightening the valve; ANSI relies on an actuator, which allows for adjustment of the output force and enables repeated testing. 2. The so-called “zero leakage” is theoretical. ANSI 6 provides criteria for assessment, which are more practical; leakage tests yield data, rather than stating that “there are no visible leaks.” . ” The media used for zero-leakage and ANSI 6 testing are both (3~4 BAR? ) For low-pressure gases, the actual leakage amount depends on the specific medium and pressure; for example, what is the actual leakage amount for H2 at 30 BAR? Have the process engineers specified the allowable leakage amount under operating conditions? If it is proposed, how can it be tested and inspected in the factory?

I compared 598 and ANSI VI; their requirements regarding leakage are similar. In other words, by choosing the API standard, it is assumed that the valves must achieve VI-level sealing

Water leakage amount under different testing standards. For your reference.

It depends on which standard your project is governed by

Oh, divine meter – may I ask where this meter data was obtained from?