RE: discharge valve of pumps

From: <Erik>
Date: Mon Oct 17 2005 - 14:21:00 EDT

When the discharge line is full you can start a pump with the valve open. When the line is empty you should start with the discharge valve closed otherwise the flow at startup is too high and there is also a risk of waterhammer the moment the line is completely filled.

Pumps in parallel operation are usually installed with a check-valves at the discharge side. When there are no check-valves an automatic operating valve is used to prevent pumping fluid from one pump through the other pump.

Erik

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Van: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] Namens VIJAYAN PULIKKATH
Verzonden: Monday, October 17, 2005 7:21 AM Aan: PipingDesign@yahoogroups.com
Onderwerp: [PipingDesign] discharge valve of pumps

From: Vijayan Pulikkath
Location: Consultants, Chennai, India
Asst Design Engr

1. Which is the natural position for a discharge valve of a pump when the pump is started?

    valve open
    valve closed
2) Reason?

3) Is it normal to have an interlock for pump start/stop with the discharge valve when they are operating in parallel and on auto standby? Is it essential?

Vijayan

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[Non-text portions of this message have been removed] Received on Mon Oct 17 14:21:00 2005