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South Asia's Only Exclusive Exhibition on Industrial Pumps Valves
and Systems
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14 - 16 November, 2008 - Hitex Exhibition Center, Hyderabad,
India |
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Welcome
to the Official Website of IPVS 2008
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Technical Query IPVS 2008 |
Vent and Drain are also provided on most volute casings
of centrifugal pumps.
The vent connection is to release any air or gases
likely to get entrapped in the casing, which is always a
possibility especially with split casing pumps and
end-suction pumps with side discharge volute.
Drain connection is of course at the bottom-most portion
to drain, better still, flush and drain any settle-able
foreign matter entraining in the flow or material
disintegrating due to corrosion or abrasion.
The drain connection will be of fairly large size in
case of solids-handling pumps, such as paper stock
pumps.
Hygienic pumps, such as pumps in dairies need flushing
at regular intervals. So, instead of a simple drain
connection, the pumps are provided with quick clamping
and unclamping feature.
S. L. Abhyankar
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Dear Ethanhan,
I think you are referring to vent and drain
connections pursuant to API 610 sealing
plans.
I will assume that your query relates to
API610.
Within API 610 there are a number of shaft
sealing plans which I believe cross-relate
to API 682 Shaft sealing systems for
centrifugal and rotary pumps. See also ISO
21049.
The standards will provide for a number of
tappings (normally half inch NPT I think?)
in the seal chamber on the API 610 pumps.
These tappings may be used, or not used,
dependent on the pumping application. These
are normally located in the seal chamber.
The vent and drain connection – sometimes
also called the quench connection can be
used for a number of purposes. For example
suppose you were pumping some really thick
stuff like bitumen or tar you could
introduce low pressure steam to stop the
'liquid' solidifying on the shaft/mech seal
when the pump was stopped or when the liquid
cooled down to ambient temperature.
You could also use the tapping to use a
water flush to take away any leakage from
the seal area. In the event of a seal
failure (if a double mech seal was used) the
'vent' could take away this liquid – this is
handy for example if you were pumping
something nasty like acid or other highly
corrosive or toxic liquids.
But please look at API 610 and API 682 for
further guidance as I am no expert in this
field.
Regards
John
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From
ethanhan
Why vent
and drain are needed in pump??? probably
where is it located?
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Technical Forum |
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Organisers : |
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Orbitz
Exhibitions Pvt Ltd,
202 - Navyug Industrial Estate, Sewree West, Mumbai - 15, India
Tel :
+ 91 22 2410 2801 - 04 Fax : +91 22 2410 2805 url:
www.orbitzexhibitions.com |
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