I am HoD mechanical at Uch Power Station-Pakistan. We have three cooling water pumps to circulate cooled water from cooling tower's cold water basin into steam turbine condenser and vice and versa. Each CW pump is a mixed flow centrifugal pump with 17280 m3M/Hr capacity; 495 RPM; 971 shaft power. Two pumps remain in service while one at stand-by. We have anti-reverse devices installed at each pump for reverse-flow protection. At pump discharge, we have a motor operated butterfly valve.
Problem:
We are experiencing too many failures of our anti-reverse devices. So we intend to install "Non-Return Valve" between pump discharge and discharge motor operated valve. It may be pertinent to highlight that our discharge line is of 72-inch diameter. Will it be practicable to install non-return valve at this bigger line? If so, could you share some detail about the type NRV suitable for our application and any other technical information?
Have an insight or suggestion?
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Re: How best to install a Non-Return Valve
25 April 2011 at 1:29pmThe NR valve should be located on the discharge line after the pipe has been increased in size from the pump discharge nozzle, so a larger diameter would be ideal as long as it's larger than the pump discharge flange size.
I'm afraid I can't guide you on the type or manufacture of valve to use as there are many good quality valve manufacturers in the world.
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