Dear all,
I am doing stress analysis for a Circulating water system of a power palnt.there are 5 pumps,4 working and one stand by.Each capacity is 8.333 m3/s and pump discharge nozzle diameter is 1800 mm dia and 12 mm thicknees.Pump manufacturer does not provide the alllowable nozzle load.Can any one tell me what will be approximate allowable nozzle load.
Is there any code which gives allowable nozzle load for 400NB dia and above for a pump?


Ukundu

Hi Ukundu,
If vendor Allowable Load is not available Try to keep the expansion stress at the discharge anchor point as much low as possible and practicable.Try to keep it within 10 Percent.If you do so I think later stage( when Vendor data is available) there should not be any Major problem.

Regards,
Analyser

Ukundu,

Vendor is the ultimate responsible person to provide the allowable data.
So keep ask him to provide the values


regards

Sha...

Agree with Sha that you must ask vendor to approve the forces or ask them to send the allowable load data.

Regards,
RK

If you really get desparate and can not get any information re allowable nozzle loads you could always use API 610 nozzle loads as a guideline if you are using a centrifical pump. If you can meet API 610 then your nozzle loads should be fine.

Mind you I would be telling the vendor if he doesn't know what nozzle loads his pump can withstand then you don't want his pumps.

Miss Itchy,
Please note API 610 gives allowable upto 400 NB.The nozzle size Ukundu is taking about is of 1800 NB.

Ukundu,
you can try 3 option
1.try to keep the expasion stress as earliar mentioned
2.try to get allowable load from the vendor
3.You can extrapolate the allowable load value from API 610(Not recomended by the API, for your own reference only).

Thanks,
Analyser

70" discharge is pretty far out there for a pump, certainly well beyond anything API-610 envisions.

What kind of temperature are you looking at? If you are circulating water, the temperature may not be much of a factor and you may mostly have a support problem to consider. In that case, you may be able to minimize the loads anyway with a well laid out support arrangement.