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prasaa
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Purging N2

02/05/2009 1:57 AM

why N2 purge connection is in suction for centrifugal & in discharge for recip.(PD) pump.
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The Prof
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#1

Re: N2 purging

02/05/2009 2:16 AM

You have to be clearer; why and what are you purging? Are you "purging" with the pumps running or stationary?

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prasaa
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#2

Re: N2 purging

02/05/2009 4:05 AM

pump at running and stationary position
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The Prof
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#3
In reply to #2

Re: N2 purging

02/05/2009 4:26 AM

Why and how much N2 and what are you pumping? I am just interested.

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cblw
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#4

Re: Purging N2

02/06/2009 4:14 AM

Type 'n' motors rated voltage 3.3kV and above shall include facilities for purging to avoid sparking at motor start due to incendive discharges.
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The Prof
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#6
In reply to #4

Re: Purging N2

02/06/2009 11:09 PM

Agreed, but not from the suction or discharge of the pump as per OP.

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betomachine
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#5

Re: Purging N2

02/06/2009 12:49 PM

Wouldn't injecting gas into a running pump give you issues? I am intrigued as well.

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yesyen
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#7

Re: Purging N2

02/08/2009 12:04 PM

I do not know if I've understood your question well...

Purging with N2 is done in pumps (or any equipment for this matter) for removing gaseous inflammable/toxic residues.

This is normally done before handing over an equipment for maintenance.

Refereed equipment here are centrifugal pumps and reciprocating pumps. For any pump handling volatile (and flammable) hydrocarbons with toxic contents like H2S, the liquid is safely disposed or transfered as to empty the equipment. Emptying outlet could be to flair header (if the liquid is fully volatile). While so draining, air can not be used for pushing the liquid because of it would form an explosive mixture and N2 will not.

For this it call for one inlet for N2 entry and one out let for liquid/gas to get out of the equipment. So N2 connection(s) is (are) mostly a matter of convenience and preference such that such purging leaves (almost) no residue behind.

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RadiumD
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#8

Re: Purging N2

05/15/2009 2:20 AM

I dont understand your question as well..

Are you purging for both centrifugal and reciprocating pump?

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Users who posted comments:

betomachine (1); cblw (1); prasaa (1); RadiumD (1); The Prof (3); yesyen (1)

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