Hazard levels for pressure vessels with internal bladders

[LT Judd]

TL;DR Summary

What is the US system for classifying pressure vessels to determine hazard levels and required level of design and inspection oversight.

Hi , I am based in Australia and my question originates from some grey areas in the Australian system of classifying pressure vessels. I am guessing most users on this forum are US based . Does the US have a system for classifying pressure vessels such as air receivers , boilers, autoclaves, heat exchangers etc. to determine what level of inspection and design review is required?. If so could some one briefly describe it. From what I have seen on the web it looks like you don't have a general standard , but different standards depending on the industry and application. I am interested particularly in the case of water buffer tanks and accumulators that have a bladder inside them filled with nitrogen and how they are considered in terms of risk and hazard.
The Australian system is, I think, based on a German one in which you start with a pressure X volume figure ( MpA x Litres) and then mutiple by 3 different service factors to get a hazard number. The hazard numbers are then divided into five different bands (Logarithmically) which call out different requirements involving design, verification inspection and operation.

 

[russ_watters]

We have ASME boiler and pressure vessel code, but inspections are a state (or insurance) thing. I live in Pennsylvania and we have our own PVC that sits over top of ASME for administration.

It seems to me that risk assessment is limited; the codes are prescriptive and you just find what category yours is in (unfired pressure vessel).

https://www.dli.pa.gov/Individuals/...ges/Boilers-and-Unfired-Pressure-Vessels.aspx