API 610 vs. API 6AF
API 610 vs. API 6AF
(OP)
Can someone please explain to me API 610.
API 6AF shows graphs where a pipe flange limitation can be read out. One can determine under a specific set of bore pressure and tension load a maximum bending moment or visa versa depending on how one like to read the charts. This is understandable and easy to follow.
If I have to select the flanges directly at a pump I am forced to consider API 610. In API 610 there is only a table of maximum allowable forces and moments for the suction and discharge side of a pump. These numbers are only a fraction compared to API 6AF. I was told that API 610 is already including pump-off forces (tension loads) which could explain the offset in values.
My questions still is: How can someone setup an API, limiting the allowable forces and moments without knowing the pressure regime or geometric form, properties and thickness of material?
Any comment that brings some light to this is highly appreciated!
TM
API 6AF shows graphs where a pipe flange limitation can be read out. One can determine under a specific set of bore pressure and tension load a maximum bending moment or visa versa depending on how one like to read the charts. This is understandable and easy to follow.
If I have to select the flanges directly at a pump I am forced to consider API 610. In API 610 there is only a table of maximum allowable forces and moments for the suction and discharge side of a pump. These numbers are only a fraction compared to API 6AF. I was told that API 610 is already including pump-off forces (tension loads) which could explain the offset in values.
My questions still is: How can someone setup an API, limiting the allowable forces and moments without knowing the pressure regime or geometric form, properties and thickness of material?
Any comment that brings some light to this is highly appreciated!
TM





RE: API 610 vs. API 6AF
RE: API 610 vs. API 6AF
Title: Guidelines for the Design and Installation of Pump Piping Systems.
V. A. Carucci and J. A. Payne
Welding Research Council Bulletin 449
This is a guide to designing piping systems so that the pumps will have a long and happy (bearing) life.
Look here for WRC publications
http://www.forengineers.org/wrc/wrcpvrcbulletin.htm
Best regards, John.
RE: API 610 vs. API 6AF
I believe it is important to point out the intent in the development of API-610. This standard, with it's requirements for forces and moments on pump flanges, was set up to enable a purchaser to procure a "robust" pump.... one suitable for refinery service.
Contrast the physical construction of an API-610 design with that of a similar ANSI B73 series pump and you will notice the difference. The API pump is bigger and more rugged and, typically used at a higher temperature.
I don't believe that the industry has set a position on allowable loads for ANSI pumps ( I think that the Hydraulic Institute has been looking at this for some time) However, you can be sure that the allowable loads, if stated by the manufacturer will be much lower..
Anyway, John Breen (above) makes an excellent suggestion in the purchase of the WRC document.....
Hope this helps....
MJC
RE: API 610 vs. API 6AF
TM
RE: API 610 vs. API 6AF
Tim