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Boiler Blowdown Vessel Size

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Posted by Pressure Vessel Manufacturer on September 15, 2009, 8:56 pm
 


Boiler Blowdown Tank Volume Estimation:

Who has a hard and fast rules on boiler blowdown receiver
sizing ?
We manufacture a range of Blowdown receivers and supply then to a
broad spectrum of companies.
Many use their own approximative rule of thumb methods for sizing and
some more
technical - we ourselves aim within the guidelines of publications
like PM60.
HSE publication PM60 is mostly re-produced here and you will see in
actual fact it
leaves plenty to the imagination.....
www.air-receivers.co.uk/blowdown_vessels.htm
Does anyone employ a method (without tonnes of  pages of
thermodynamics
calculations) that they find reliable ?
Some smaller of our smaller operators of steam plant seem divided
over the 'best way' - bearing in mind the larger the vessel is the
more it will cost, so if they don't offer like for like they could be
priced out of the job.

Answers on a Postcard ?


Abbott & Co.(Newark) Ltd
Newark Boiler Works
http://www.air-receivers.co.uk/flash_vessel.htm

Notts. NG24 2EJ
Tel: 01636 704208
Fax 01636 705742
www.air-receivers.co.uk
http://www.air-receivers.co.uk/air_receivers.htm
http://www.air-receivers.co.uk/pressure_vessels.htm

Posted by harry on September 18, 2009, 6:19 pm
 


On Sep 15, 9:56 pm, Pressure Vessel Manufacturer

imagination.....www.air-receivers.co.uk/blowdown_vessels.htm

705742www.air-receivers.co.ukhttp://www.air-receivers.co.uk/air_receivers.htmhttp://www.air-receivers.co.uk/pressure_vessels.htm

Boiler blowdown Vessels.
The reason that the sizing  is pretty vague is that the size needed
depends on many variables.  Quality of boiler feedwater/makeup water.
Type of boiler water treatment.  If there is to be heat recovery. The
% amount of condense recovery.  If the vessel is insulated or not.
These are a few  spring to mind.
These all affect the amount of blowdown a steam boiler needs.  The
function of the vessel is to hold the water until it is sufficiently
cool to be discharged to the public sewer, allow suspended solids to
precipate out and to allow flash steam to safely dissipate.
Usually the vessel is sized on the rating of the boiler. With a bit
added just in case.  And some more if the feedwater quality is
particularly poor.

You could have a look at the Spirax Sarco page, I seem to remember
there's calculations there. A bit of industrial espionage!

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