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I've seen Relief Valves installed on Transfer lines that run from outside tank farms to inside buildings. This is usually for Thermal Expansion since the fluid may see extreme temperatures inside and outside (in the winter with hot rooms inside). The PSV's are usually small and installed at...

I've found that information on standard charts from pipe and fitting suppliers. I'm not sure where to find that on-line or in literature. I've run across a problem related to this in the past and at the time found this site that details some of what you are asking. Pipe Thread Link When you...

I agree that you should probably purchase it...briefly though it gives guidance on everything that you would deal with in a Process Piping system: Welding Materials Fittings and other components Pressure Tests Stress Analysis and Support Gaskets Thermal Expansion Pressure Relief Piping There...

The existing conservation vent and emergency hatch vent are adequetly sized for any overpressure scenario so there isn't a big rush to install something that might not be necessary

As I stated earlier, the code states that an ASME certified relief device is necessary, this could be a rupture disc, relief valve etc. As long as it is stamped with the proper capacity This issue is still up in the air and a decision of either recertification or adding relief has not been...

The tanks are in Missouri and they mentioned the same thing, recertifying the tanks to under 15 psi. We've started that process already so we'll see where that goes. The inspector asked if there were inspection tags on the tanks and I had not seen them. He than told me there are literally...

I spoke with the state Boiler and Pressure Vessel inspection dept and they said that all ASME stamped devices need an ASME Stamped Capacity Relief device. The existing Conservation Vents and Pressure Hatch do not satisfy this requirement So, I think we're going to talk about removing/rerating...

That's the crux of the question. Do all ASME Stamped Pressure Vessels need ASME Rated Relief Devices? In low pressure (<15 psi) applications, are non-stamped Vents and Relief Hatches (with adequete capacity) OK to use?

Are conservation vents and hatches from companies such as Varec or Protectoseal ASME Rated? I'm not too worried about the stamp, the calcs show the sizes on the existing devices can handle the flow. Its more the marking and capacities that I'm concerned about. So, its really a question as to...

That's exactly the situation. I'm not sure why they installed ASME Vessels for what is 99.99% of the time Atmospheric (or close to Atmos) service. And you bring up some excellent questions EGT01. The vessels currently do not have spare nozzles on which I could easily add a Relief Valve or...

I have several solvent storage tanks stamped at U-Stamped at 40 psig/150 F with a Conservation Vent/Vacuum vent installed on the tank. A secondary emergency manway vent is also on the tank. Typical pressures do not exceed atmospheric/ambient conditions, however I need to consider a Fire...