RE: Sea Water Suction Pipe

From: <Ed>
Date: Tue Sep 17 2002 - 08:37:00 EDT

A few items comes to mind (Pardon my weakness for the metric system):

1.) Recommended pump suction is 2.5 to 5.0 ft/sec.

2.) Pump suction reducer connection to suction piping shall be eccentric with flat side on top.

3.) Calculate your System Net Positive Suction Head (NPSHa) i.e. length of suction piping,
vapor pressure of fluid at pumping temperature, suction lift, etc. and compare it to your Pump Net Positive Suction Head Required (NPSHr) : NPSHa > NPSHr.

4.) Visually check your suction line, in the USA we have known problems from Zebra Mussels.

-----Original Message-----
From: Ahmed Vawda [mailto:avawda@aksugar.co.ae] Sent: Tuesday, September 17, 2002 8:07 AM To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Sea Water Suction Pipe

Dear Forum Members

My sea water pumps are cavitating!
Flow rate 2750 m3/hr each.
Delivery pressure 1.8 barg
Suction pipe 500 mm.
Pump inlet nozzle 400 mm.

There is a lot of turbulence in the suction pit of each pump. The 500 mm suction consists of a long radius bend.
Is there some thing I can modify in the suction to reduce the turbulence?

Ahmed Vawda
Process Engineer
Al Khaleej Sugar - Dubai

[Non-text portions of this message have been removed]

Texas Flange - a good source for information on industrial flanges, all they ask is for referrals for designs they help with. 877-610-8924.
www.texasflange.com

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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Tue Sep 17 08:37:00 2002