Boiler Blowdown Vessel Size Conundrums:

Does anyone have any hard and fast rules on boiler blowdown vessel
sizing ?
We manufacture a range of Blowdown receivers and supply then to a
broad spectrum of companies.
Many use their own 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 it
leaves plenty to the imagination in reality:
www.air-receivers.co.uk/blowdown_vessels.htm
Does anyone employ another method (without 6 pages of thermodynamics
calculations) that they find reliable ?
Many of our smaller clients and 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
Northern Rd
Newark
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

On Thu, 21 May 2009 01:54:45 -0700 (PDT), Pressure Vessel Manufacturer
wrote:

Boiler Blowdown Vessel Size Conundrums:

Does anyone have any hard and fast rules on boiler blowdown vessel
sizing ?
We manufacture a range of Blowdown receivers and supply then to a
broad spectrum of companies.
Many use their own 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 it
leaves plenty to the imagination in reality:
www.air-receivers.co.uk/blowdown_vessels.htm
Does anyone employ another method (without 6 pages of thermodynamics
calculations) that they find reliable ?
Many of our smaller clients and 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 ?

If I was looking for something like that, I wouldn't be looking at
modern sources - call the Reference Section at your localand
university libraries, and see what steam books they have from at least
100 years ago.

Steam is Old Tech. When Steam was the only game in town, and ran
railroads and ships and factories through line-shafts and cities...
They solved all those problems decades ago, quantified the problems
and the solutions and wrote them all up for practical use - then
technology marched forward and we forgot all the answers.

The big problem is geting past the technical terms and measurement
systems evolution. The old books will reference tools and materials
and supplies that you've never heard of, and can't buy anymore - so be
prepared to spend lots of time in the library running those down too.

There are almost always better substiututes, or they reformulated it
and call it something else today, and use it for an entirely different
purpose - but they have to be found.

-- Bruce --

On Thu, 21 May 2009 01:54:45 -0700, Pressure Vessel Manufacturer wrote:

Boiler Blowdown Vessel Size Conundrums:

Does anyone have any hard and fast rules on boiler blowdown vessel
sizing ?
We manufacture a range of Blowdown receivers and supply then to a broad
spectrum of companies.
Many use their own 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 it
leaves plenty to the imagination in reality:
www.air-receivers.co.uk/blowdown_vessels.htm Does anyone employ another
method (without 6 pages of thermodynamics calculations) that they find
reliable ? Many of our smaller clients and 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
Northern Rd
Newark
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

How much do you want to bet that those 6 pages of thermodynamics
calculations are based on assumptions that may or may not be true, and
the real answer is "put it in and see if it's big enough"?

--
http://www.wescottdesign.com

On May 21, 11:05*am, Tim Wescott wrote:
On Thu, 21 May 2009 01:54:45 -0700, Pressure Vessel Manufacturer wrote:
Boiler Blowdown Vessel Size Conundrums:

Does anyone have any hard and fast rules on boiler blowdown vessel
sizing ?
We manufacture a range of Blowdown receivers and supply then to a broad
spectrum of companies.
Many use their own 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 it
leaves plenty to the imagination in reality:
www.air-receivers.co.uk/blowdown_vessels.htmDoes anyone employ another
method (without 6 pages of thermodynamics calculations) that they find
reliable ? Many of our smaller clients and 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
Northern Rd
Newark
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

How much do you want to bet that those 6 pages of thermodynamics
calculations are based on assumptions that may or may not be true, and
the real answer is "put it in and see if it's big enough"?

--http://www.wescottdesign.com


Go and look over the American Society of Mechanical Engineers (ASME)
Boiler and Pressure Vessel Code.

Use the appropriate sections for fired or unfired pressure vessels.
They may include recommendations for blow-down provisions.

If all fails write (email) them and ask for their recommendations.
This code forms the basis for many international rules and
regulations.

Wolfgang

"Pressure Vessel Manufacturer" wrote in message
...
Boiler Blowdown Vessel Size Conundrums:

Does anyone have any hard and fast rules on boiler blowdown vessel
sizing ?
We manufacture a range of Blowdown receivers and supply then to a
broad spectrum of companies.
Many use their own 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 it
leaves plenty to the imagination in reality:
www.air-receivers.co.uk/blowdown_vessels.htm
Does anyone employ another method (without 6 pages of thermodynamics
calculations) that they find reliable ?
Many of our smaller clients and 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 ?



Not a postcard,but I just went to my collection of old technical boohs and
found the Spirax Sarco Technical Literature folder and under "Boiler
Blowdown" found the following:

Boilers up to 2300 KG/hr = 1.5 cubic meters

2300 to 4600 Kg/hr = 2.4 cubic meters

4600 to 9000 Kg/ hr = 4.25 cubic meters


its pretty hard to make any real rules at the water quality, and henc blow
down volumn varies all over the place .