Valve seat test – What are Standards for leakage acceptance?
At the valve seat leakage test (also called closure test), one side (valve inlet) shall be subjected to the test pressure and amount of leak shall be measured on the opposite side of the valve. The seat leakage of control valve is the quantity of test fluid passing through an assembled valve in the closed […]
Difference “Pressure Safety Valve” and “Pressure Relief Valve”
Understanding the differences between Pressure Safety Valves – PSV and Pressure Relief Valves – PSV is essential for selecting the appropriate device for a specific application. Pressure relieving devices include mechanisms such as Pressure Safety Valves (PSV) and Pressure Relief Valves (PRV), although there are other types of pressure relieving devices as well, such as […]
Qualification of line pipes for pressurised hydrogen applications?
Piping in acc. to ISO 3183 and API SPEC 5L must be evaluated with regard to their suitability for the use of hydrogen. Additional test procedures at qualifications of line pipes are required. Specifications and standards Specifications and standards for special hydrogen applications are currently only available to a limited extent and will become increasingly […]
Austenitic stainless steels: What is the difference between “L” grade and “H” grade?
The common austenitic grades of stainless steel, such as 304 and 316, are also available “standard” and with controlled low carbon “L” or high carbon “H” contents, with particular applications. Grade UNS EN-Number Specified Carbon (%) Remarks 304 S30400 1.4301 0.07 max 304L S30403 1.4306 0.03 max 304H S30409 – 0.04-0.10 316 S31600 1.4401 0.07 […]
What are designations for materials such as EN-Material No., Grade, AISI, or UNS?
The EN material number according to EN 10027-2 is a unique number and is primarily based on the chemical composition and is primarily used in Europe. However, there are also other systems which are explained below. The regulations for pressure equipment in Europe and America have traditionally introduced different designations for materials, each of which […]
Must the ASME Certification Designator be stamped on the nameplate?
ASME Designator (U, U2, …) must appear directly below the ASME Certification Mark, however it may be printed rather than stamped on nameplate.
What sizes do the ASME Certification Marks Stamps come in?
ASME code stamp size are available in ½ inch and ¾ inch sizes. The pressure vessel manufacturer can specify the size. The standard size is 1/2 inch. Note: Additional space on name plate is required for the designator, which is stamped by the certificate holder.
The ASME BPVC is always published on July 1. What is the latest date for application of the new code?
The current asme code edition is mandatory no later than 6 months later (as of January 1 of following year). The date of order is valid. The ASME BPVC is always published on July 1.