If Forces & moments at valve flanges are less,it helps for the easy
removal of the valve in operating position.
For e.g. Any springs are located nearby valve ,the cold loads if higher may
introduce some forces & moments on the valve flange ,which may cause the
difficulty if that valve is leaking & want to replace the gasket .
The spring force acting (say upward)on the valve flange can cause the
shearing of studs(valve weight acting downward) resulting in locking of the
bolt removal which may need the heavy force to be applied at that existing
position.
To avoid such a position ,spring's, if located close to valve are to be
designed so that it will not transfer heavy forces & moments to the valve
flange.
The allowable forces & moments at valve flange may be for the abovesaid
purpose.
Regards,
Rajesh V Balapure
----- Forwarded by Rajesh V Balapure/JAMNAGAR/RIL on 02/24/2005 08:49 PM ----- |---------+---------------------------->
| | Rajesh.Balapure@r|
| | il.com |
| | |
| | 02/24/2005 08:25 |
| | PM |
| | Please respond to|
| | PipingDesign |
| | |
|---------+----------------------------> >-------------------------------------------------------------------------------\ --------------------------------|
|
|
| To: PipingDesign@yahoogroups.com |
| cc: (bcc: Rajesh V Balapure/JAMNAGAR/RIL) |
| Subject: Re: [PipingDesign] Regarding Piping Stress Analysis |
| Importance: Normal Sender's OU: Reliance |------------------| | | | [ ] Confidential | | | |------------------||
>-------------------------------------------------------------------------------\ --------------------------------|
What you did is correct ,but What did you mean by allowable forces &
moments for valve?
Vendor might want you to check allowable forces & moments for flange
leakage analysis point of view.
The Allowable nozzle loads may affect in case the valve weight is different
from earlier??
Also you have not mentioned the pipie size & valve size ??higher sizes
critical lines requires flange leakage analysis.
Regards,
Rajesh V Balapure
|---------+---------------------------->|
| | sathish babu |
| | <togsb@yahoo.co.i|
| | n> |
| | |
| | 02/24/2005 10:22 |
| | AM |
| | Please respond to|
| | PipingDesign |
| | |
|---------+----------------------------> >-------------------------------------------------------------------------------\ --------------------------------| | | | To: PipingDesign@yahoogroups.com | | cc: (bcc: Rajesh V Balapure/JAMNAGAR/RIL) | | Subject: [PipingDesign] Regarding Piping Stress Analysis | | Importance: Normal Sender's OU: Reliance |------------------| | | | [ ] Confidential | | | |------------------|
>-------------------------------------------------------------------------------\
--------------------------------|
Hello Everybody,
I will introduce myself to the group, i am
sathish babu working in ASLTOM Projects india
Ltd in piping department of plant engineering
section.
I am a Graduate Engineer and having a experience of three and Half Years.
Now i am working in CAESAR II stress analysis
When a Forces and moments to be checked ? to my Idea i usually check on Equipment Nozzles where the piping is to be connected for that i will be defining the nozzle node to have displacement and check in the Restraints Summary for all operating and sustained condition.
Now i faced a small problem , i have angle valve ( Main steam bypass valve dumped to condenser ) while doing analysis i have defined it as rigid component and finished the analysis.
After that the valve manufacturer produced the drawing and asked me to check the allowable forces and moments on the valve.
What i did was went to local element forces and moments and checked the allowable forces and moments on the corresponding node to be OK - Whether This is Right or I have to do anything more
If anyone have any Idea about when this forces and mon=ments to be checked and the basis please explain
Thanking you
Sathish Babu
Steve McKenzie <mechproj@xtra.co.nz> wrote:
Paul
I have already given myself a stern warning about this, and any further outbursts on my part will, regrettably result in me requesting my resignation. This has been conveyed to me in a formal letter as a first and final warning, so I will not accept any excuses from myself. Sometimes I hate being my own boss.
It sure would be nice to leave this whole national/language mess alone.
If you agree please indicate by not replying.
Cheers
Steve
-----Original Message-----
From: Paul Bowers [mailto:pbowers@pipingdesign.com]
Sent: Thursday, February 24, 2005 3:58 PM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Metallized valve
Sajit Viswan wrote:
> Paul, > > I haven't understood your giberrish. Didn't bother to > try to understand either. > > Sajit
Maybe all the recent discussion has served to bring out unsaid, possibly
pent-up thoughts and attitudes - it wasn't planned to do so.
I remind everyone that you are all free to unsubscribe at any time.
This discussion list is at about 1100 members now; well over 75% do not ever contribute to the technical discussion. I don't think that 750 sudden unsubscriptions would hurt the quality of the technical discussion.
Then again, it seems to be a free-for-all at the moment and the best move might be to just let it play itself out without possibly heavy-handed intervention.
Paul
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