Want to get rid of steam turbine pump.??
Want to get rid of steam turbine pump.??
(OP)
hey guys how are u all?
Hey we have steam turbine pump at cooling tower and now we wanna switch to electric motor driven pump. we are plannin to put 75 HP motor and wanna hook up our motor to generator, but now question arise, our generator capasity is 55 KW and when i counted Kw for 75 HP motor it comes to around 66. now suggest me wat are the possible way i have.?? how can i get rid of steam turbine pump and use electric motor driven pump???
Hey we have steam turbine pump at cooling tower and now we wanna switch to electric motor driven pump. we are plannin to put 75 HP motor and wanna hook up our motor to generator, but now question arise, our generator capasity is 55 KW and when i counted Kw for 75 HP motor it comes to around 66. now suggest me wat are the possible way i have.?? how can i get rid of steam turbine pump and use electric motor driven pump???





RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
Bill
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"Why not the best?"
Jimmy Carter
RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
You could probably drive a 50 Hp or 60 Hp motor with a direct connection.
There are a few issues.
>The motor should be connected to the generator before the generator is started, and if the motor is stopped the generator should be stopped before restarting the generator.
>The motor control and protection must be arranged for a ramping voltage start.
> A Variable Frequency Drive is a good choice for starting motors on a weak source, EXCEPT for generators. Many VFDs send a lot of harmonics back to the source and generators and particularly the Automatic Voltage Regulators on generators don't like harmonics.
Recommended generator sizes for motor starting.
Direct On Line motor starting with other loads. Base loads plus 3 KVA per Hp. see note #1
Direct On Line motor starting with no other loads or other loads able to accept voltage dips. Base load plus 2.5 KVA per Hp. see note #1
VFD motor control. Base load plus 2 KVA per Hp.
Generator starting with direct connected motor. 1.25 to 1.5 KVA per Hp.
If there is more than one motor, all except the largest motor may be considered as part of the base load.
When the boiler is up to pressure, use the steam turbine. For black starts use a high volume, lower pressure pump to charge the boiler. Possibly add a second small high pressure pump to maintain the boiler level until there is enough pressure to run the steam turbine pump.
Bill
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"Why not the best?"
Jimmy Carter
RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Want to get rid of steam turbine pump.??
The generator isn't big enough. Buy a bigger generator.
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If we learn from our mistakes I'm getting a great education!
RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
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If we learn from our mistakes I'm getting a great education!
RE: Want to get rid of steam turbine pump.??
The controls must be modified to run fro an external source, possibly batteries or batteries and an invertor.
The pump may be permanently connected to the generator. If the load o the pump exceeds the power of the diesel, the diesel will slow until enough load is shed to maintain equilibrium. The generator will be unsuitable for other loads.
The maximum current must be checked carefully. The dead rack may have to be adjusted on the diesel to avoid overcurrent in the generator. I would not design such a system from scratch for such a small application, but if the equipment was to hand I would invest the time to give it a try. System performance will be similar to a VFD with a power limit set at less than 100% of the motor rating. The speed torque curve of a centrifugal pump should make this doable. As the boiler pressure rises, the load on the pump motor will drop with may pump curves.
Bill
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"Why not the best?"
Jimmy Carter
RE: Want to get rid of steam turbine pump.??
rmw
RE: Want to get rid of steam turbine pump.??
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If we learn from our mistakes I'm getting a great education!
RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
I'm sure that there are factors of which I'm unaware, but from the info - as I understand it - Rube Goldberg would be proud. ;)
RE: Want to get rid of steam turbine pump.??
RE: Want to get rid of steam turbine pump.??
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If we learn from our mistakes I'm getting a great education!
RE: Want to get rid of steam turbine pump.??
Bill
--------------------
"Why not the best?"
Jimmy Carter