Pump Working Pressure and Flange Rating

[Wnaqsh]

Dear Friends,

I need to know the relationship between pump working pressure & flange class rating...

For example (Pump working pressure 325 psi and flange drilled to PN16 ....

Note: if this subject has been discussed before, please send me the link.

Thanks,
Waseem

 

[Artisi]

Is the "working pressure of 325psi" you have given the operating pressure or the suggested maximum operating pressure for the pump?, rated and working are not the same -- as for PN16 flanges you can check yourself what the rating is.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Wnaqsh]

the 325 psi is manufacturer design maximum working pressure ...

 

[LittleInch]

Then a PN 16 flange appears to be significantly under rated.

The relationship is quite simple - maximum pump discharge pressure (considering worst case inlet pressures) MUST be lower than the discharge flange rating at the operating temperature. This applies to any piping system, not just pumps.

Note that the design maximum may be with the biggest impellor and not your particular case, but you're only giving us snippets of information so it's difficult to see why the vendor has done this. Maybe the density of the fluid you're pumping is quite low? Who knows?, only you and you're not giving us much to go on here.....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way