Topic History of: Difficult Pump Application/Selection
Max. showing the last posts - (Last post first)
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Gerald |
a Vertical progressing cavity pump. the pumping element in submerge hence it will never have problems priming. send us your requirements at
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we will slect you an option delivery is about 8 - 10 weeks. |
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Norvicute |
Hello njjicheng,
If you will run the new pump in parrallel with the old two it is not a good idea to have a smaller pump since they will have a constant TDH (HEAD) and combined capacity. Just I said you have to provide the pump curve (curve characteristic) of the old two pumps to the pump manufacturer for them to have proper pump size selection.
If you have problem communicating with the EOM of your existing pump you may contact me at
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.
Regards,  |
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njjicheng |
Dear Norvicute,
The BFW system revamping of our plant is based on wholly plant expansion, just only need add a new pump to parallel with other three pumps, the design operation model will be three pumps running and one standby.
Just as you mentioned, we checked OEM and expected data sheet for revamped plant and found the shortage is less than the normal flowrate of one exsiting pump,only it is 60% of the latter. So new issue arising, which is better, add a same capacity pump or add a samller pump. The operating conditons will be change if add a same capacity pump. But adding a small pump is also not a good option, I think.
Appreciate your feedback. |
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Norvicute |
Hi njjicheng  ,
If your going to run the additional pumps in parrallel with the existing, you cannot have different pump otherwise you have to provide the pump curve to the manufacturer for them to have proper selection. This is important.
Have you check with me OEM (original equipt. mfg). If they already discontinued the pump model they might have a replacement one.
Since you have mentioned that your plant will revamp a high BWF system. There would be changes on your operating conditions. Does the existing pumps can perform well on that changes? You have to check with your OEM.
Please let me know if I can help further.
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njjicheng |
Seek help
Hello,
our plant will revamp super high BFW system, and need add a new BFW feed pump. At present, there are three pumps in this system, one is motor drived,two are drived by turbine. normally, two run, one standby. Normal flow of every pump is 170M3/h, and the dischaige pressure is 15Mpa, the temperature is 120. now , the problem is we can not find a duplicate to existing pump and we add a different pump will bring what result, whether it will cause unstable or other situations? the textbook said it is not recommendated two different pumps work together. in addition , I aslo consult some power plant engineers , they also held same opinions , BFW feed pumps in most of PP are produced by same manufacturer.
So, I would like to seek some expert to clear my confusion and give some comments for this matter.
For further communication, you can send E-mail to
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, I am looking forward to hearing you .
Thanks! |
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Norvicute |
Hi Jason,
I do some searching.. Check this
http://www.gouldspumps.com/download_files/trashhog/Trashhog_b715-2.pdf
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