Piping Pressure Calculation

Do you have the B31.3 code?

There is more to it than straight pressure design.

I am not sure what you mean by "calculate Pipe Operating Pressure into Design Pressure" - but paragraph 304.1.2 covers internal pressure for straight pipe.

I am not sure if it is just your grammar, or if you are confused. But you design your pipe system for design conditions which are always higher than your operating conditions.

Also - be careful of the pressure 1.5X pressure test - if your design temperature is elevated, and your test medium (water) is at a lower temperature, you have to increase the test pressure by paragraph 345.4.2

I believe you are the same guest who commented on the following thread on insulation.

You do seem to have a very good graspe on thermal & it's codes. See I know who you are. Now you need not register I'll know you from your answers but do send me your email address for I am dumb and at times will need your help badly.

Alright - I sent you an email, but please realize that the address has nothing to do with my real name - it is a pen name.

Hi,

There were two kinds of pressures, i.e. Design & Operating. Presume you will optimize the pipe material which is by multiply 1.5 of design pressure cannot passed and therefore you try to playing with operating pressure. It's okay as long as the pipe class material will allow it. So, go thru pipe class material which is can refer to ANSI Std. and don't forget to consider additional margin of 12.5% due to the manufacturer thickness product as the common practice.

Enjoy your hot coffee,

Cheers ,

Design pressure must be not less than maximum operating pressure (max static, closed valve pump heads, etc) but it's not unusual to add a bit for safety. How depends on the context - what fluids, what sort of pressures have you in mind, etc.

Codey.

In reality.... if your basis is the design preasure, atleast between 15-20% less is the recommended operating pressure.

When you do the selection of equipment (i.e. steam boiler), at least you are putting an allowance for the running capacity not to be on the maximum running condition especially for 24/7 operation.

that is where you establish the Operating Pressure (at least bet 15-20% less from the design pressure)

Your equipment will be quite safe, as well as the longer MTBF result will be attainable.

Jojie_oak