API 6D Appendix M states the 'Specification Level for Hydrogen (SLH) for valves in hydrogen service shall be specified'. In determining the SLH, App M.2 states:
"The following can influence the determination of the desired SLH:
1) location of valve (confined space, buried, open air...
We have some ball valves that were leak checked during commissioning by shutting the valve (typically with pressure on one or both sides)by depressurizing the cavity and then checking the cavity vent for if either of the seals are allowing gas to leak through. Now assuming the test went fine and...
Hi All,
Our contractor is proposing to install inspection plugs on hot insulated piping that can be removed for inspection of CUI. I understand the theory that they replicate the conditions of the pipe and can easily be removed for inspection, but I'm more concerned with how they perform in...
Hi All,
We need to change out some studs on a control valve bonnet due to some concerns around stress corrosion cracking. The current bonnet studs are B8M's and we would be changing out with duplex studs. The problem is that there isn't a planned shutdown any time soon to do this and replacing...
Hi everyone,
I have a W8X31 H beam column which our contractor had difficulty installing so their 'solution' was to wrap a soft sling around and pull into position. This resulted in some inward localised bending of the column flanges which they then cold worked straight again with a hydraulic...
Hi all,
Has anyone heard of ECSCC being an issue on uninsulated SS process piping? SCC from the contents of the piping shouldn't be an issue as is carrying processed natural gas. However one of the customer engineers is concerned that the piping is operating above 60degC so wants all the...
Hi everyone, does anyone know best practice for static bonding across carbon steel / stainless steel flange interfaces where an insulating gasket is used? The point of the insulating gasket is to electro-chemically isolated between the two flanges and avoid any galvanic corrosion. However one of...
