International reputed vendors required for SS kNIFE GATE VALVES

From: <Vyakaranam>
Date: Wed Jul 25 2007 - 00:08:00 EDT

Dear ALL,
Can any one suggest good international reputed vendors supplying Knife gate valves.

Thanks & Regards
Krishna V.
-----Original Message-----
From: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] Sent: Friday, July 20, 2007 1:22 PM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Digest Number 2417

Piping
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Messages In This Digest (5 Messages)

1a.

Vapor should be in Shell side or tube <> side.... From: ravi.kant@fluor.com 1b.

Re: Vapor should be in Shell side or tube <> side.... From: Christopher Wright

2a.

RES: [PipingDesign] Vapor should be in <> Shell side or tube side.... From: William de Sá Novaes
2b.

Re: RES: [PipingDesign] Vapor should be in <> Shell side or tube side.. From: Paul Bowers

3.

Compressed Air Cleaning of Main Steam <> Piping From: Paul Bowers

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Messages

1a.

Vapor should be in Shell side or tube side....
<http://groups.yahoo.com/group/PipingDesign/message/13396;_ylc=X3oDMTJxZnVyMmNkB\
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Posted by: "ravi.kant@fluor.com" ravi.kant@fluor.com
<mailto:ravi.kant@fluor.com?Subject=

Re%3AVapor%20should%20be%20in%20Shell%20side%20or%20tube%20side%2E%2E%2E%2E> shock_ravi_chem <http://profiles.yahoo.com/shock_ravi_chem>

Thu Jul 19, 2007 8:59 am (PST)

Hi
Can anyone just tell ,in case of Shell & tube heat exchanger or in any other HE can we provide vapors in tube side.... actually wat i knw is in Liquid - liquid case first we do check the corrosive nature then will decide whr 2 take in shell r tube side ...usually we do take corrosive liquids in tube sides...But what if its a corrosive vapor...can we take it in tube side??????,

waiting for ur reply guys ?

Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of the company.

[Non-text portions of this message have been removed]

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Re: Vapor should be in Shell side or tube side....
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Posted by: "Christopher Wright" chrisw@skypoint.com
<mailto:chrisw@skypoint.com?Subject=

Re%3A%20Vapor%20should%20be%20in%20Shell%20side%20or%20tube%20side%2E%2E%2E%2E> chrisw539 <http://profiles.yahoo.com/chrisw539>

Thu Jul 19, 2007 9:17 am (PST)

On Jul 19, 2007, at 7:25 AM, ravi.kant@fluor. <mailto:ravi.kant%40fluor.com> com wrote:

> waiting for ur reply guys ?
You might try putting this into English. I think the list is willing to cut ESL speakers some slack, but the quality of your reply depends strongly on how well your question is understood.

Christopher Wright P.E. |"They couldn't hit an elephant at chrisw@skypoint. <mailto:chrisw%40skypoint.com> com | this distance" (last words of Gen. 

.......................................| John Sedgwick, Spotsylvania
1864)
http://www.skypoint <http://www.skypoint.com/~chrisw/> .com/~chrisw/

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2a.

RES: [PipingDesign] Vapor should be in Shell side or tube side....
<http://groups.yahoo.com/group/PipingDesign/message/13398;_ylc=X3oDMTJxZHV2MXMzB\
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Posted by: "William de Sá Novaes" william.novaes@oxiteno.com.br
<mailto:william.novaes@oxiteno.com.br?Subject=
Re%3ARES%3A%20%5BPipingDesign%5D%20Vapor%20should%20be%20in%20Shell%20side%20or%\ 20tube%20side%2E%2E%2E%2E> w_novaes <http://profiles.yahoo.com/w_novaes>

Thu Jul 19, 2007 11:11 am (PST)

Dear Ravi,

By the application view, there is no problem to put a vapor stream in tube side of a shell and tube heat exchanger. A good example is a vapor stream at very high pressure than another stream, in this case is preferable to put the stream at higher pressure in the tube side because is cheaper (mechanical design) and safety. Another case is a gas/gas application where in this situation there is no choice. So put a gas stream in shell side is a good practice not an obligation. The advantage to put a gas stream in shell side is because we get a better overall heat transfer coefficient (U) than put this same stream in tube side. This is truth because the shell side gets a better turbulence condition than tube side and compensates a little bit the bad thermal conductivity of the gases have. Pay Attention in tube side vapor/steam condensing application where is not recommended use tube diameter smaller than 1 inches to avoid plug flow and erosion in tubes and covers. In gas application pay attention too in problems of vibration to avoid undesired damages and a short equipment cycle life. In the market there are several software packages to rigorous shell and tube heat exchanges thermal and mechanical design and vibration analysis like HTFS, B-JAC and HTRI. The TEMA is a good source for understand the vibration problems and analysis.

Best Regards,

William de Sá Novaes
OXITENO Nordeste Ind. & Com.
CP - Engenheiro de Processos
' 11 3177 6161
7 11 3177 6058
* william.novaes@ <mailto:william.novaes%40oxiteno.com.br> oxiteno.com.br
<mailto: william.novaes@ <mailto:william.novaes%40oxiteno.com.br>
oxiteno.com.br>

-----Mensagem original-----
De: PipingDesign@ <mailto:PipingDesign%40yahoogroups.com> yahoogroups.com [mailto: PipingDesign@ <mailto:PipingDesign%40yahoogroups.com> yahoogroups.com] Em nome de ravi.kant@fluor. <mailto:ravi.kant%40fluor.com> com Enviada em: Thursday, July 19, 2007 9:26 AM Para: PipingDesign@ <mailto:PipingDesign%40yahoogroups.com> yahoogroups.com Assunto: [PipingDesign] Vapor should be in Shell side or tube side....

Hi
Can anyone just tell ,in case of Shell & tube heat exchanger or in any other HE can we provide vapors in tube side.... actually wat i knw is in Liquid - liquid case first we do check the corrosive nature then will decide whr 2 take in shell r tube side ...usually we do take corrosive liquids in tube sides...But what if its a corrosive vapor...can we take it in tube side??????,

waiting for ur reply guys ?

Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of the company.

[Non-text portions of this message have been removed]

Este e-mail é confidencial e de uso exclusivo do endereçado. Seu conteúdo e os documentos anexos não devem ser revelados a terceiros. Caso você não seja o destinatário, favor notificar o remetente e eliminar este e-mail imediatamente do seu sistema. É expressamente vedada a divulgação, distribuição, cópia ou, sob qualquer forma, a utilização do todo ou parte desta mensagem ou dos documentos a ela anexados. Alertamos que esta mensagem transitou por via pública de comunicação, podendo ter seu conteúdo e remetente originais adulterados, não havendo garantia de que o remetente desta mensagem seja o mesmo que aparece no campo "From".

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Re: RES: [PipingDesign] Vapor should be in Shell side or tube side..
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Posted by: "Paul Bowers" pbowers@pipingdesign.com
<mailto:pbowers@pipingdesign.com?Subject=
Re%3A%20RES%3A%20%5BPipingDesign%5D%20Vapor%20should%20be%20in%20Shell%20side%20\ or%20tube%20side%2E%2E> pipingdesignguy
<http://profiles.yahoo.com/pipingdesignguy>

Thu Jul 19, 2007 6:01 pm (PST)

William de Sá Novaes wrote:

> The advantage to put a gas stream in shell side is because we get a better overall heat transfer coefficient (U) than put this same stream in tube side. This is truth because the shell side gets a better turbulence condition than tube side

I'd actually never thought of that, but it makes sense due to the baffles redirecting the flow.

Paul

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3.

Compressed Air Cleaning of Main Steam Piping
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Posted by: "Paul Bowers" pbowers@pipingdesign.com
<mailto:pbowers@pipingdesign.com?Subject=
Re%3ACompressed%20Air%20Cleaning%20of%20Main%20Steam%20Piping> pipingdesignguy
<http://profiles.yahoo.com/pipingdesignguy>

Thu Jul 19, 2007 8:37 pm (PST)

<<This paper presents a summary of long-term and
short-term experience that demonstrates compressed  air-blow results are "at least as good, and often better than steam-blows." Compressed airblows  have been used effectively on applications for supercritical boilers, drum-type boilers, and heat recovery steam generators for preoperational  cleaning of main steam lines at power
plants with ratings from 35 to 700 MW.
Cleaning of the main steam piping is required to minimize the possibility of damage to the turbine  by removing weld bead deposits, pipe slag, and other foreign material which might otherwise  be carried over into the turbine. Any particles  that would be dislodged while operating must be dislodged during the cleaning process, and any particles that are or become loose must be removed from the system. Thus, the momentum  or cleaning force must exceed the force that occurs during the maximum flow operation.  This requirement is satisfied by selecting the initial pressure level so that the momentum or cleaning force ratio is greater than one. The procedure is similar to a steam blowdown except that compressed air is used as the cleaning  medium. The system is pressurized using rented compressors or site equipment and depressurized by rapidly opening the temporary valve. The cycle is repeated until the cleanliness criteria have been satisfied.>>

http://www.gepower.
<http://www.gepower.com/prod_serv/products/tech_docs/en/downloads/ger3636a.pdf>
com/prod_serv/products/tech_docs/en/downloads/ger3636a.pdf

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[Non-text portions of this message have been removed] Received on Wed Jul 25 00:08:00 2007

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