Centrifugal pumps with backlog impeller

[a1987]

Dear Sirs

i would have an important question to do..Do centrifugal pumps with backlog impeller (see attached file) in compliance with API 610 11th ed.??

thx a lot and best regards

 

[a1987]

Backlog impeller = recessed impeller

 

[DubMac]

If I'm seeing the drawing correctly it looks like an open impeller, and that would not be in compliance with API610.

 

[a1987]

why not in compliance?

 

[DubMac]

Open impellers not allowed.

 

[a1987]

thank and best regards

 

[DubMac]

Don't mention it.

 

[TenPenny]

6.6.1 (5.6.1) Unless otherwise specified, impellers shall be of
the fully enclosed, semi-open or open type.

Note: Previously, only fully enclosed impellers applied with
other types with purchaser’s approval.

In other words, open impellers are permitted, unless the purchaser states otherwise.

 

[DubMac]

Living in the old 6th & 7th Edition world of API. Did not realize opens are allowed without approval.

 

[PumpSmart]

No it is not on API.
This pump does not meet API 610 standard.

Recessed impellers are used for other industries, application and fluids that are not on gas/petroleum refinery industry.