i'll check out the book review in the amzaon.com. thanks. the cited article from perry's basically addresses the issue on maldistribution which is important. i remember a case where we have this massive distributor (aka sparger) that has collapse inside the column. The result is damage on the shell, to the support structure and to the distributor itself. We contacted the licensor and gone over the the records. Findings tended to point to maldistribution - sparger shakes, jump off the support (one is fixed and the other end simply suported), hitting the shell (deep gouges), it fell damaging adjacent support for the trays/weirs and trough. The fixed - increase size of the hole, stiffen support structure, shell repair (weld built and ground to blend), etc. works ok now.
-----Original Message-----
From: Steve McKenzie [mailto:Mechproj@xtra.co.nz]
Sent: 09 May, 2002 10:05 AM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Manifold diameter
I have the CD and the book, which is far easier to use. Second best
engineering book ever written, I reckon. The CD keeps the excess baggage
charges under control though.
Continuity applies, but if the branches are too big, most of the flow comes
out the upstream branches. If the branches are too small, excessive pressure
is required for a given flow.
In case you're wondering, my vote for best book is "The Efficient Use of Steam" by Oliver Lyle
Cheers
Steve Mckenzie
-----Original Message-----
From: SARE, RALPH H. [mailto:SARERH@YANPET.SABIC.com]
Sent: Thursday, May 09, 2002 6:35 PM
To: 'PipingDesign@yahoogroups.com'
Subject: RE: [PipingDesign] Manifold diameter
The perry's handbook is also available in cd. convenient. of course the printed handbook is better. wont the flow be just proportional to the square of the diameter? what must come in must come out.
-----Original Message-----
From: Steve McKenzie [mailto:Mechproj@xtra.co.nz]
Sent: 09 May, 2002 12:54 AM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Manifold diameter
Hi Ivan
I assume your concern is to get the same flow from each of the outlets.
Perry (Chemical Engineers Handbook) covers this with the design of spargers which are similar (pipe with holes drilled down the side).
The rule is:
"The ratios of kinetic energy in the inlet stream to pressure drop across the outlet hole(branch line) and of friction loss in the pipe(manifold) to pressure drop across the hole should be equal to or less that one tenth."
If this rule is followed, evenness of flow distribution is claimed to be within 5%
You may need to fit orifice plates to the outlet branches to achieve this.
As a starting point, I would look at a manifold velocity of around 1.5m/s
I hope this is what you are after.
Cheers
Steve McKenzie
-----Original Message-----
From: Ivan Fernandez [mailto:ifernandez@tecna.com.bo]
Sent: Thursday, May 09, 2002 3:08 AM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Manifold diameter
Avelino BarreiroHi to all contributors,
We have to design a manifold for water injection, with one inlet and seven outlets ; and I would like to know how to determinate the diameter of the manifolds pipe.
Anyone can give me some information for this ?.
Thanks !
Iván Fernández C.
TECNA BOLIVIA S.A. Torre CAINCO Av. Las Américas Nº 7 Piso 10 - Santa Cruz - Bolivia Tel.: (591-3) 336-2263 Fax: (591-3) 337-8470
Casilla de Correo 6572 - E-mail: ifernandez@tecna.com.bo
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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Thu May 09 03:39:00 2002
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