Range of Pressure 1

[S Le]

Hello Everyone,

In the aerospace industry, we tend to use terms low pressure, medium pressure, high pressure, and ultra-high pressure. I haven't come across any Codes (ASME, NB-23, API, CGA, etc)that explicitly state the limit of all pressure category.

The few that I was able to find, the limits are not consistent. For example, API-570 states high pressure as being greater than 150 psig, while ASME Section VIII, Div 2, implies very high pressure is greater than 10,000 psi.

is there a consensus on what limits are for each category?

S Le

 

[TGS4]

No, there is not. It is best not to use such indeterminate and relative terms.

 

[LittleInch]

None I'm aware of.

One man's high pressure is another's low pressure.

In pipelines eg distribution systems work at mbar to maybe 2 bar. Transmission lines work at 70+ bar.

Individual companies might apply their own limits such as low pressure, medium pressure, high pressure but there is no consistency in the industry.

I don't use terms like this precisely because there is no standard.

Electrify uses LV,MV and HV and even then they keep changing the rules so some people use MV and others HV for voltages above 1000V

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[davefitz]

In the old days, a "high pressure" boiler in NYC was one that was over 15 psig, and thus had to meet the ASME code. In the power industry, there are now ultra supercritical pressure steam generators that operate at 4500 psig, and there is no mention of high pressure or not, except to discriminate betweeen the different steam turbine stages. For example, a 3 pressure HRSG might haver a low pressure evaporator ( 60 psig) , intermediate pressure evaporator ( 600 psig) and a high pressure evaporator ( 2300psig) , but it is ony a relative term.

"...when logic, and proportion, have fallen, sloppy dead..." Grace Slick

 

[EdStainless]

I have seen some end user guides that set pressure ranges for in-house use.
The highest pressure that I have dealt with in aero is 5ksi hydraulics (8ksi test pressures).
I wouldn't call that ultra-high pressure, the water jet cutting guys run up to 60ksi.

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P.E. Metallurgy, consulting work welcomed

 

[S Le]

Thank you for the input everyone.