Allowable Nozzle load for metering Pump

[pfcei]

Dear All,

At this time i'm doing piping stress analysis of Recover Oil piping connect to a pump with type reciprocating control volume pump (Metering Pump)
Is there any of you have an experienced with this kind of pump?
Client ask to analyze the nozzle load for this pump piping system, but i've got the vendor drawing and data 2 days ago, and there is no allowable load data that gives by the vendor. The problem for me is that the pump is a 6 inch bottom suction nozzle and 4 inch top discharge nozzle,as you see in this link :

http://www.nikkiso.com/products/pump/metering/img/c02-1.jpg

or you can see sample of pump in attachment below.....

The API Standards for this pump is API 675, and onc e again there are no list/table of Allowable nozzle load in API 675.
I can't use API 610 or ASEM B73.1 M Allowable load since it is a bottom suction nozzle and Top discharge nozzle, and equation in API 610 or ASME B73.1 can't be used here.
Could someone refer to me how to calculate Nozzle Allowable load for this Metering pump ?
I hope i can get response from you soon.
Thanks.

Best Regards

PFCEI

 

[micalbrch]

You cannot (and should not) calculate the allowable nozzle loads. That's supplier's job. They might not do it free of charge if it wasn't specified but they can do it.

 

[pfcei]

Thanks Micalbrch,
I know about that and i have contact the suppliers for this but still there is no answer from them till this night. My time for this job is very limited, client has asked the calculation report, all they know that they have send the pump vendor data and drawing to us, but as i told before there is no Allowable Nozzle load give by the vendor. So, we can't just wait, at least while the calculation report still in IFR status, i can only things two way :
First i calculate the stress analysis, and gives the nozzle load to the suppliers and let them to decide wheter it is acceptable or not, or i can calculate the allowable load by myself and we've done this before many times for API 610 pump by using the Table 4 Allowable load and compare the allowable load with load from stress analysis software using In-house spreadsheet, and then submit the calculation to client, and wait comment from them, then we can ask the suppliers to supply the numbers of Nozzle allowable load.

AS in API 610 we can use Table 4 Allowable Nozzle Load to check pump nozzle load acceptable or not, or we can use a rule of thumb as below for preliminary check :

The Allowable Force:
Fx<= 1.3 W <= 160 lb/nominal diameter
Fz,= 1.0 W <= 130 lb/nominal diameter
Fy (comp) <= 200 lb/nominal diameter <= 1.2 W
Fy (tension) <= 100 lb/nominal diameter <= 0.5 W
Where W = Weight of Pump
The Resultant Force Fr = Sqrt Fx^2 + FZ^2 <= 2000 lb
The Allowable Moment :
Mx = 3.4 W ft-lb
My = 2.0 W
Mz = 1.5 W
Where minimum value for W is 1000 lb

NEMA SM 23 Steam Turbin , API 676 Rotary Pump, API 617 Centrifugal Compressor, ASME B73.1 M Pump and others also have this kind of rule thumb.
My question, what about API 675 Pump ? I hope that some one in this forum having experience for this problem.
Thank you.

PFCEI

 

[ColonelSanders83]

The only location were you can get usable nozzle loads is from the vendor. Any other non-applicable specification or rule of the places the liability due to failure on you.

I do a substantial amount of consulting and nozzle loads are a big part of the analysis. I do not have experience with your specific pump but I can tell you that many times the nozzle loads the pump vendor will roger up to tends to be les than what you find in the specifications for said pumps (this is usually and exception in the pump PO sold as a cost savings measur). The only way to find out what the allowables really are is to send a request to the pump vendor referancing a PO.

API should make some statment as to nozzle loads, I would expect something along the lines of "do not exceed the vendors allowbles" or "as specified by the customer"

Just my two cents worth.

A question properly stated is a problem half solved.

Always remember, free advice is worth exactly what you pay for it!

http://www.ap-dynamics.ab.ca/

 

[pfcei]

Thanks Colonel Sanders, i think i'm going to try to contact the vendor again and send the allowable load request...