Centrifugal pumps flow limitation

[johnthebest]

Hello everyone
In our project specification we required API 610 centrifugal pumps for condensate.
having these parameters:
Flow 0.7-0.8(m3/h)
Suction pressure: 2.2 bar
Discharge pressure: 35.8 bar

The contractor claimed that there is no centrifugal pumps available on the market that can operate in these parameters, hence he proposed double diaphragm pumps.

what are your thoughts?

 

[rotw]

The flow appears extremely low. The hydraulic power we are talking ~700 Watt ?

By the way, just curious, what is the use of pumping condensate (as defined) as such relatively elevated pressure?

 

[johnthebest]

@rotw To inject it as a fuel with natural gas in a gas turbine

 

[rotw]

You may want to check this link for example, or try similar suppliers:

https://www.hydra-cell.co.uk/5264-/HydraCell-TSeries-pumps-to-API-674-Standard-MORE

If the duty works out (concerned by the low flow), you may not get one to API610 but at least to API (for instance API-674).
Due to gas turbine application, you may increase reliability/availability by sparing the pump e.g. 2x100% (if not already done).
You could ask contractor who proposed double diaphragam pumps to substantiate the proposal and especially provide a reference list from proposed vendor (i.e. booster pump for gas turbine application).

 

[LittleInch]

You might be much better off looking at chemical injection pumps or dosing pumps at that sort of flow.

Some sort of multi-cylinder piston pump could quite easily do your duty as simple package.

Why the insistence on a centrifugal?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[chrishuang]

Centrifugal pump is not suitable for your specs, the minimum flow rate of a centrifugal pump is at least 2-3 m3/h.

Before you choose the type of the pump, you need figure out the following(personal suggestions):

1. is the liquid corrosive or not? what is it?
2. is the liquid contains solid particles or not? if there is, how much diameters of the particle
3. you have to consider how to install the pump before choosing one, is it vertical or horizontal, if you are in design stage, then only if the pump parameters can match your condition, you can choose freely, if you need to replace one, then the site condition you need to consider
4. is it outside or indoor installation? is it under normal atmoshpere as it is related to the suction height(NPSHa),if not, you have to calculate it
5. each type of the pump has its pros and cons, centrifugal one, diaphragm one, canned one, metering one,piston one, you need learn which one is the most adaptive

Flow 0.7-0.8(m3/h)
Suction pressure: 2.2 bar
Discharge pressure: 35.8 bar

the diff. pressure is 33.6 barg and the flow rate is this low, I suggest you can choose from high pressure piston pump

hope this is helpful for you

 

[johnthebest]

@littleInch for maintenance. Now after seeing all of ur responses we will go for a positive displacement pump. Thx all for ur helo.