Pump with a 20inches suction dia.
Pump with a 20inches suction dia.
(OP)
I need to calculate the ALLowable nozzle loads for an axially split case pump with suction dia 20 inches. It is designed according to ANSI standards. Standard for calculating the allowable nozzle loads is ANSI/HI 9.6.2 (Rotodynamics Pumps) but in this standard table for maximum nozzle loads contains load values upto 10 inches dia only.
How Do I calculate loads now? Is there any formula for interpolation of these loads?
One more thing is that it is written that the loads also depends upon the wallthickness of the pump(obvious) but in the standard while calculating allowable loads, wall thickness of the pump is not considered.
Can anyone help?
How Do I calculate loads now? Is there any formula for interpolation of these loads?
One more thing is that it is written that the loads also depends upon the wallthickness of the pump(obvious) but in the standard while calculating allowable loads, wall thickness of the pump is not considered.
Can anyone help?





RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
we are considering the nozzle size only. How would I know If the thickness is also fine?
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
Again you have issues with phrasing the question. There are two problems here:
1) How to extrapolate (not interpolate) loads for flanges larger than 10" to come up with industry acceptable values (linear extrapolation is not going to be acceptable)
2) How to confirm the pump design is adequate to handle these loads without any operational problems
"The loads depend on the wall thickness of the pump." No... Manufacturing a pump with thin suction/discharge piping certainly isn't going to cause a revision to the industry standard to lower allowable nozzle loads. You have it backwards, the wall thickness of the pump depends on the allowable loads.
Put some more thought into the specific areas you are having trouble with, and pose those questions individually. You should mention your goals when relevant, and when it helps clarify the nature of your request. Hard to tell if you want to design piping, design a pump, or just want to fill in some datasheets.
RE: Pump with a 20inches suction dia.
You WANT zero loads on the pump suction AND discharge nozzles.
You might have to tolerate very small loads (less than 75 to 50 lbs, or hand pressure when installing), but you WANT zero, regardless of what size pump you are installing.
RE: Pump with a 20inches suction dia.
RE: Pump with a 20inches suction dia.
1) you want to find out what is the required allowable nozzle load of a 20 inch suction diameter axially split case pump
designed according to ANSI/HI 9.6.2.
2) But the ANSI/HI 9.6.2 only provide value for required allowable nozzle load for pumps up to 10 inch only.
3) You are looking for fomula/ guide line to calculate the required value for a pump with 20 inch nozzle.
I do not have copy of ANSI/HI 9.6.2. but I believe you are looking for some thing similar to the attached page extract form API-676 3rd Edition.
What is your purpose of finding out the value? do you need the value for your piping design verification or you are designing the pump.
Pump designer will use these required allowable load to determine the casing wall thickness and also the rigidity of the supporting feet.
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
I commented in a thread a few weeks ago about checking nozzle loads transferred to foundations and it may have been seen as nit-picky. Maybe now it makes more sense?
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
Maybe if they weren't building an expansion next to identical equipment with identical service conditions, that was designed without issues and has been operating trouble free for 5 years, I might feel a tinge of guilt telling them to go back to the drawing board.
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
A better designed pump and base plate will save potentially a huge amount on piping required just for nozzle load load related flexibility, with attendant reductions in space and weight.
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
RE: Pump with a 20inches suction dia.
You may have been screwing the pipers, but it's all dosh in the bank for us stress engineers, so thanks for your efforts on our behalf.
RE: Pump with a 20inches suction dia.
1gibson- sorry, didnt want to hurt your feelings but I am still not getting the sign conventions used in ANSI 9.6.2. What I think is that several assumptions were made in ANSI 9.6.2.
Yeah API 610 was a big help for future though.
RE: Pump with a 20inches suction dia.
Now if you'll excuse me, since the cat is out of the bag, I need to figure out something to do with this surplus of tin foil.
RE: Pump with a 20inches suction dia.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pump with a 20inches suction dia.
RE: Pump with a 20inches suction dia.
Just want to share something with you. It seems (I presume) that the majority of your experience was in the Oil&Gas Industry. If you had to deal with the Boiler Feed Pump discharge piping in a huge Supercritical Power Plant (just to bring you closer to the picture: we are are talking about 16~20 inch class-4500 piping with a design pressure of about 320 bars = 4641 psi and design temperatures of about 360 deg.C = 680 deg.F). That's a "bull-dog" kind of piping (super-stiff). To get down to the traditional API 610 values for a 16~20 inch pipe with this "bull-dog", you will need tremendous amount of flexibility ending up with an odd-looking layout that's never been seen before in any Power Plant. That is why we need to work with real numbers that work with real configurations. A minimum of 4 or maybe 5 times API 610 is just about enough to make a reasonable layout work, so dont be surprised
C2it...I've "starred" you because you are absolutely right when you stated "A better designed pump and base plate will save potentially a huge amount on piping required just for nozzle load load related flexibility, with attendant reductions in space and weight."
Regards,