Non-Metallic Pressure Safety Valve in HCL Service
Non-Metallic Pressure Safety Valve in HCL Service
(OP)
At one of our plants, we have a HCL transmission line of about 2 inches. The line handles HCL at 35% concentrations and at about 50C temperature that can reach in summer season. A PSV was originally installed of Stainless Steel 316 which has history of leakage. While reviewing plant data, we now would like to change the PSV with either Hastelloy 276 C or a plastic (PVC, PDVC or PTFE) coated internals of carbon or stainless steel. Can colleagues guide us if non-metallic coated PSV are commercially available and are usually used in process plants.
Views from colleague will be greatly welcome.
MetCorr
Views from colleague will be greatly welcome.
MetCorr





RE: Non-Metallic Pressure Safety Valve in HCL Service
You forgot to include pressure and capacity to determine size, but anyway: I doubt the answer is yes.
With this stuff inside the pipeline you will want to control the emission, and be sure you have a high quality PSV : answer exotic metal.
Perhaps you could find a cheaper solution (if pressure realations suitable) for your process by using bursting discs with bursting and/or leakage detection.
RE: Non-Metallic Pressure Safety Valve in HCL Service
A Plastic valve could help you or a coated valve like
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if the temperature is adequate
rgs.
RE: Non-Metallic Pressure Safety Valve in HCL Service
Metcorr
RE: Non-Metallic Pressure Safety Valve in HCL Service
I think you should clarify which code covers the application and use an approved valve for the specific code.
rgs.
RE: Non-Metallic Pressure Safety Valve in HCL Service
RE: Non-Metallic Pressure Safety Valve in HCL Service
The primary seal is lead, with a breaking pin. Then there is a secondary spring-closed SRV component with Monel wetted parts. So the valve can relieve, then reseal.
I don't condemn or endorse Richter, but I think that I would be nervous with all that TFE stacked up and left with a large spring load on it.