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Hi Guys, I have a query. - What is the BS standard (Latest edition) to be used for compliance for Chemical process centrifgual pumps and Positive displacememt pumps? - Is the API standard for centrifugal and Positive displacement superior in terms of design and specifications? (Meaning, can an...

Hi Guys, I have a query. - What is the BS standard (Latest edition) to be used for compliance for Chemical process centrifgual pumps and Positive displacememt pumps? - Is the API standard for centrifugal and Positive displacement superior in terms of design and specifications? (Meaning, can an...

Hi Litteinch, Your OP said you had made an error and obtained a pump with an independent cooling shroud instead of one which used the process fluid. [highlight #FCE94F]Yes[/highlight] The key here is this "Meaning the cooling fluid is independent of the pumping fluid.". I believe that what you...

Hi @Littleinch; Noted on your reply. Thank you. yes it makes sense to try a smaller head pump. We will explore this option too with the manufacturer. Hi @Artisi, Noted. As mentioned above, we will try to revise our pump model for a better curve.

Hi @Artisi, please find attached curves. Very sorry, I should have provided this in the first place. Hi @Tenpenny, you are right. the motor is sized based on End or curve / shut-off (which is Max. Hp). This goes the same rule with all the manufacturers. So how could either the manufacturers...

Hi @Artisi, Unfortunately,that's the last choice we could take. Since there are couple of approvals to get through which is the toughest. The way we are looking forward for now is to explore on how we could modify the existing pump. Hi @Littleinch, No, the shroud has a multiple purpose. there...

Its me.

Hi Guys, We are under a big dilemma now. Need your kind inputs please. The submersible pumps ordered is to be cooled using pumping fluid which is ambient temperature. Although we can also supply external water (continuous flow) & filling the cooling shroud to cool the pump motor. Now...

Hi Guys, I need your advise. I am doing an apple to apple comparison of Mixed flow Vertical line-shaft pumps. Duty conditions are 4,400m3/hr @ 15m, 2,500m3/hr @ 30.3m Based on the motor specs compliance of 1.15, the motor rating turns out to be 500Kw / 8 POLE for the Manufacturer A. However...

Hi Bimr, Is there any formula / handbook which we could refer to calculate the dynamic load?

Hi Nickelkid, Can the CI pump take higher loads than published by the OEM? I imagine it can. I believe the same too. But the question is if it can match the API-676 moments for the same NPS. For forces, yes it can. The moments primarily depends on material properties & the distance btw the...

TenPenny, As per API-676 guidelines, for NPS 4" (Fx, Fy, Fz, Mx, My, Mz)- (1300N, 1300N, 1300N, 700Nm, 700Nm, 700Nm) respectively. Again this is Min. The construction is CS. Our CI Pump construction for NPS 4" (Fx, Fy, Fz, Mx, My, Mz)- (2000N, 2000N, 2000N, 650N, 265N, 300N). So as you can see...

Bimr, Noted. But how do you calculate the dynamic load for PD pumps? LittleInch, There is no clear representation / requirement from my customer about dynamic load. I am not sure if this is used for centrifugal pumps either.

Hi Guys, I have a PD pump (Internal Gear) with Cast Iron construction. As the understanding goes, the nozzle loads (Forces and Moments) are not compliant to API-676. The pump footing lies on the bkt which is offset from the pump casing by 400mm. Now, the piping is already fabricated based on...

Hi Guys, I have few doubts and new your advise. Am referring to PD Pumps (Internal Gear) There was this question from my customer which am not getting a satisfactory reply from the manufacturer. 1. What does dynamic load imply to PD pumps? 2. How to calculate Dynamic load? Thanks in advance.

Noted. Thank you bimr

Hi Guys, From the acceleration head formulae, Ha = LvnCSg / 2.31Kg (ft) is the "L", just the the total length of pipe from suction tank to pump suction flange? Or ‘equivalent length of straight pipe factoring all the friction loses on elbows, Tee joints, valves & fittings etc’. I don't get any...

moltenmetal: The temp is high as per the process requirement. The given info is operating condition. The pump is selected with larger capacity & therefore the speed is lesser comparatively. We are using a diaphragm leak detector to identify any mis-happenings. So far I've not come across an...

Thank you

I agree with you. Thanks