Pump Flange - What Pipe flange should I install? 1

[curtis2004]

Hi Everyone,

I'm designing piping system for thermal fluid with design pressure 150 psi @ 550 F. I have a pump in this Hot Oil system ordered from Germany and I've got the following flange specification:

Pump Standard: EN733
Suction nominal dia.: NPS 6
Suction nominal pressure: CL 125
Suction Flange dimension according to standard: EN1092-2
Suction flange drilled according to standard: ASME B16.1

I have question: What flange do I need to buy for my piping to connect this pump's flange? Will A105N 6" x 150# with Flat Face (removed raised face) work?

The most of the system welded construction and I do have control valves with A105N 6" x 300# RF flanged connections.

Thanks,
Curtis

 

[georgeverghese]

Vaguely recall a transition flange custom made for this application when switching from the plant ANSI flanges to the DIN flanges for a German KSB hot oil pump some years ago.
On an unrelated matter, the piping engineer found out later, much to his horror on this EPC LSTK project, that the KSB pump body had a low tolerance to piping induced thermal stresses, and suction / discharge corrosion resistant expansion bellows for each of these pumps then had to be procured.

 

[mk3223]

The pipe connection flange should be ASME B16.5 CL150 FF flange. The flange dimension of the B16.5 matches to the B16.1 CL125 FF flange.

 

[curtis2004]

MK3223,

I also think this is the case. I think, this "EN1092-2" mentioned in the spec causes for confusion. I just wanted to make sure before fixing a mistake and changing the flange ordered from DN150 x PN16 to ANSI Class 150 FF.

George Verghese,

KSB can supply pumps to both ANSI and DN. In the case above it is certainly ANSI flange. It it were Europian standard, it would have been "Suction Nominal dia.: DN150", and "Suction Nominal Pressure: PN16", with "Suction flange drilled according to standard: EN1092-2".

And you are correct about expansion bellows. Hot oils service pumps have multiply stainless steel expansion bellows connected to inlet (with 90 degree elbow) and outlet. With operating temperatures about 450-500 F (mineral oil), it will be very challenging to keep nozzle loads at reasonable levels.

Thanks,
Curtis

 

[KevinNZ]

Mr Google knows

Class 125 and Class 250 flanges and flanged fittings are made from cast iron while Class 150 and Class 300 are ductile iron, steel, or stainless steel. However, the bolting pattern is the same for both Class 125 and 150 so, regardless of material they will bolt together, as is also the case for Class 250 and 300

 

[1gibson]

This is the suction side so maybe it has a lower pressure rating than you mentioned, but a 6" cast iron CL 125 flange is not good for 150 psig @ 550*F.

 

[curtis2004]

1Gibson,

I'm also a bit concern about this temperature/pressure rating of the pump and I am waiting for clarification from supplier. I could find the following info inside Pump manual and also from B16.1.

Any ideas how to interpret these?

 

[curtis2004]

This is from supplier.

If pump flange material and thickness to EN1092-2 P16, but bolt hole pattern is to B16.1, will pressure-temperature rating also change to B16.1?

Thanks,
Curtis