Pump Encounter - Visitors contribution # 3

Pump Encounter:

Mark Brein

General Manager 

Penguin Pumps

In the following article Mr. Mark Brein, General Manager, Penguin Pumps shares with us one of his personal experience and also gives us wise advice's. Its a great way to learn form the mistakes of other's and I thus, sincerely request you to go through this article and appreciate Mr. Mark's efforts of writing all through this and sharing with us his personal experience to help us learn and grow. 

       The following brief pump encounter took place in the       wet fume scrubber Industry dating back 35 years.  For many years this industry has used Cantilevered vertical pumps to pump liquid from an open reservoir, through spray nozzles,  back to the reservoir. The tanks holding the liquid were taller than they were wide by a 2 to 1 margin or greater. The liquid level height inside these tanks was always 3 ft minimum.  The volume of liquid inside these tanks was always 3-4 times the pumping flow rate. Pump problems encountered over the years were practically zero. 

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Most pump troubles should never happen - Visitors Contribution # 2

MOST PUMP TROUBLES SHOULD NEVER HAPPEN:

“GENERAL RULES OF THUMB”

Mark Brein

General Manager 

Penguin Pumps

• Size a pump to operate on the midpoint, plus or minus ¼, on its performance curve.  This simple rule has been around for many years, and it still holds true.

• Pump suction conditions:  

The piping on the suction side of the pump is much more important than the piping on the pump discharge. If any mistakes are made on the discharge side, they  can usually be compensated for by increasing the performance capability from the pump.  Problems on the suction side, however, can be the source of ongoing and expensive difficulties, which may never be traced back to that area.

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NPSH - Visitor Contribution # 1

NET POSITIVE SUCTION HEAD—NPSH

Mark Brien,

General Manager,

Penguin Pumps

This phenomenon can get complicated if allowed to do so and is a subject about which complete books have been written.  So let’s just accept the premise that every impeller requires a minimum amount of pressure in the liquid being supplied in order to perform without the liquid being pumped vaporizing inside the pump, which we may simply define as cavitation. 

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