Double Volute Casing Drain Hole [API610]
Double Volute Casing Drain Hole [API610]
(OP)
I have a somewhat large API610 OH2 pump with a double volute. This pump is holding crude in the "inner" volute because it does not get a chance to drain. The hole drilled through this "inner" volute (connecting the two volutes for drainage purposes) is drilled at 1/8" and keeps clogging. Does anyone know if API specifies what size this hole should be? 1/8" seems somewhat small. I hope this was clear. Thanks for your help!





RE: Double Volute Casing Drain Hole [API610]
Johnny Pellin
RE: Double Volute Casing Drain Hole [API610]
The general use of 1/8" is because elsewhere in API 610, size of orifices is limited to 1/8" or larger.
A 1/4" or larger hole will have no effect on the performance unless you get too ambitious with your drill.