MOP, design pressure, and tie-in requirements 1

[stonetech]

I'm confused at the concept of MOP, design pressure for pipeline design. What's the difference? When we size the pipe, we use design pressure or MOP? when we determine test pressure, we should use design pressure or MOP? Another thing, pipeline has ANSI rating, which is corresponding to a pressure, what is the difference between it to MOP or design pressure. Could you please show me the way out?

As for pipeline tie-in, can I tie in a pipeline with MOP of 9930kPa to a pipeline with MOP 7580kPa? The former line is from a well head with shut in pressure of 6000kPa?

Thanks.

 

[MJCronin]

Stone,

ASME B31.1 and B31.3 refer to a "design pressure" that "shall not be less than the pressure at the most expected severe condition of coincident internal and external pressure and temperature" (Section 301.2)

ASME VIII pressure vessels define thier "design pressure" as the MAWP or "Maximum Allowable Working Pressure"

I assume that you mean "Maximum Operating Pressure" by your acronym MOP...

I recommend that you find the maximum operating pressure of the pipeline or component, add a margin of 20-50 psig and call that the design pressure of your particular system...!!!

The ANSI rating for the component is the maximumum pressure that the component can be used at a particular temeperature. Your system operation should not exceed these maxima

Hope that this helps..

MJC

 

[stonetech]

Thank you, MJC.I really appreciate your reply. Good day

 

[BigInch]

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