dumb question: what is a pump that is not ANSI or API 2

[vesselguy]

Ok, dumb question from a non pump guy - me.

ANSI pumps as defined by ASME/ANSI B73.1 are suppose to be end suction, top discharge, L-foot, single stage pump, with defined dimensions per the standard. As far as I know, an ANSI pump is only suitable for up to the pressure rating of a 150# C.S. flange. Correct?

API 610 pumps - high pressure, high temp, multistage, various casing design, etc.

Then what do you call those pumps that are not to ANSI B73.1 but are not as heavy built as an API610? Are they a hybrid?

I have a brackish water/RO water applications that need pumps at 2000 kPag and 6000 kPag. For the 2000kPag ones, I want to use ANSI pumps. For the 6000 kPag ones I can find pumps that are not ANSI and not API, but I don't know how to classify them by name. Can a pump expert help to understand? Thanks.

 

[Artisi]

Call them by manufacturers name and model number, or if writtig a specification for bids, call them end suction top centreline discharge, back pull-out, single stage etc etc or what ever you consider best describes what you want.

 

[TenPenny]

"As far as I know, an ANSI pump is only suitable for up to the pressure rating of a 150# C.S. flange. Correct?"

No. Most ANSI pumps are available with 300# flanges as an option.


"Then what do you call those pumps that are not to ANSI B73.1 but are not as heavy built as an API610? Are they a hybrid?"

They are end suction horizontal pumps; they could be to ANSI, they could be to ISO, they could be to no particular dimensional standards (like typical paper stock pumps).

For your application, I would go with Artisi's advice; you'll probably need a multistage pump.

 

[vesselguy]

Thanks guys for responding.

Your response is what I already know but just can't be sure that's what it is. Thanks again.

BTW, yes I know ANSI pumps can have 300# flange, but I'm trying to say is I noticed most ANSI pumps I've seen are only capable of max head(pressure) upto about 280psi. That's what I mean by 150# flange rating. Am I mistaken?

As a background to why I ask my original question is that a Process Engineer tells me for the higher pressure (870psi)water pumps I should use ANSI pumps. I said "no we can't ANSI pumps because they are not suitable for this head." He keep insisting that in other jobs he has use multistage ANSI pumps (not API) for pressure higher than that. I said "those are not ANSI pumps but something else - not API but something else." His insistence shaken what I thought I knew about ANSI pumps from my past experience.

 

[TenPenny]

Typically, something like 930ft head is the max you'll find on an ANSI pump, based on a 13" impeller at 3600 rpm. Obviously, if you're in a 50Hz world, that will be different, in the order of 130m, with flow up to maybe 100m3/h at 3000 rpm.


There aren't any ANSI multistage pumps, the standard doesn't (as far as I know) cover multistage pumps.

 

[dabluffrat]

Hydraulic Institute (HI) is used as a water standard and a good guide line to follow for non-API & non-ANSI pump applications.

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