Re: stress analysis of pumps ( one operating and one stand by)

From: <shaik>
Date: Sun Sep 02 2007 - 03:31:00 EDT

Frends,

Pls Guide Me I am HVAC Engineer I do Chilled Water Pipe Design,and also Plumbing & Fire Fighting systems.

Kindly Guide Me on The Following

   1.) I Design Chilled Water Pipe Size With a Maximum Permissible ASHRAE Limits of a Maximum Friction of 4 ft per 100ft & and For Small Flows I Go With ASHRAE limits ( 50 mm & Below) With 1.2 m/s Maximum Velocity.

2. ) For Plumbing Pipe Design (cold water & Hot water)also I still Follow the Same above limits.

3.) For fire fighting systems also i follow the above limits.

  Am I Going Right.

Feroz ( HVAC Engr)
Middle East.

• HITESH N PRAJAPATI <HPRAJAPATI@ltcis.ltindia.com> wrote:

> Line temperature after isolation valve to be reduced
> gradually upto pump
> nozzles. However philosophy to be adopted as per
> project specification. I
> had also done analysis as mentioned by you and also
> line temperature after
> isolation valve is considered half of the line
> temperature before isolation
> valve. So there are different philosophy based on
> project specification.
>
> But I am not sure for traced (Electrical / steam )
> lines.
>
> Regards,
>
> Hitesh N Prajapati
> 669-1654
>
>
>
>
> "Kulkarni,
>
> Shailendra"
>
> <<a href="/group/PipingDesign/post?postID=5mq_jQGHLRRWdKMSmm02f7OPgvBLGREi30zruwkBuvyI3pcVIQA1dpNfjV5BWq3TWz8LVNitUcs">kulkarnis2@bv.co</a>
> To
> m>
> <PipingDesign@yahoogroups.com>
> Sent by:
> cc
> PipingDesign@yaho
>
> ogroups.com
> Subject
>
> [PipingDesign] stress analysis of
> pumps ( one
> operating and one stand
> 08/30/2007 05:18 by)
>
> PM
>
>
>
>
>
> Please respond to
>
> PipingDesign@yaho
>
> ogroups.com
>
>
>
>
>
>
>
>
>
>
>
>

<<a href="http://geo.yahoo.com/serv?s=97359714/grpId=215664/grpspId=1705083319/ms">http://geo.yahoo.com/serv?s=97359714/grpId=215664/grpspId=1705083319/ms</a>
>

gId=13723/stime=1188391985/nc1=3848581/nc2=4699084/nc3=4699088>
>
> While analysising 2 pump system ,(one pump is
> operating and one stand
> by),
>
> what we generally do is from isolation valve to pump
> - we keep the
> temp.as ambient for stand by pump,
>
> My question is - whether this represents the true
> condition at all?
>
> As if line temp is 200 c how it can be 21 c after
> just a isolation valve
> ?
>
> Due to this huge temp. difference loads coming on
> pumps are very high in
> stand by case , and its rather unnecssary to qualify
> it at this
> conditon,
>
> Waiting for experts comments
>
> with regards
>
>
> shailendra kulkarni
>
> [Non-text portions of this message have been
> removed]
>
>
>
>
>
>
>

================================================================================\

===
> Diclaimer:
> This e-mail and any files transmitted with it are
> intended solely for
> the use of addressee(s) only and may contain
> confidential and/or
> privileged information. Any view or opinion
> presented in the said e-mail
> is solely those of the author and do not necessarily
> represent those of
> L&T-Chiyoda Limited. If you are not the
> addressee, then this message is
> not intended for you and be advised that you have
> received this e-mail in
> error and that any use, dissemination,
> forwarding, printing or copying
> of this e-mail is strictly prohibited. In such
> case, please notify to
> the sender and delete the e-mail and any
> attachments with it from
> your system immediately. Receipt of this e-mail
> by you shall not give
> raise to any liability on the part of L&T-Chiyoda
> Limited.
>

================================================================================\

===
>
>

________________________________________________________________________________\

---

Be a better Heartthrob. Get better relationship answers from someone who knows. Yahoo! Answers - Check it out.
<a href="http://answers.yahoo.com/dir/?link=list&sid=396545433">http://answers.yahoo.com/dir/?link=list&sid=396545433</a> Received on Sun Sep 02 03:31:00 2007