RE: Strut

From: <Mandal>
Date: Wed Sep 24 2003 - 01:57:00 EDT


A rod, in general, behaves better in tension than in compression. For example, pipe hangers (using tie-rods) are used as tension members only (and never in compression) solely because of its slenderness (l/r ratio). In case of a strut, we have the advantage of lower slenderness ratio due to the inherent construction of the element (larger diameter). Hence we use it for compressive load too. However, for a fixed diameter, as length increases, the slenderness ratio also increases and, as a result, the load carrying capacity decreases with increase in strut length.

A table for the same is already available in pipe support catalogue of reputed companies like LISEGA.

Normally, for reputed pipe support suppliers like Lisega, we do not question their catalogue values. In case a vendor do not comply to their catalogue values, well, I believe you have selected the wrong vendor.

Regards,
Pankaj Mandal.
Siemens Power Engineering Pvt. Ltd.
Plot-6A, Sector - 18,
Maruti industrial area,
Gurgaon - 122015.
India.
Ph. - (0091) 124 2347990 extn.1616
Fax - (0091) 124 2347512 - 14
E-Mail - <a href="/group/PipingDesign/post?postID=NdXloKwrYFZfHGPIuzXBZMP5firbqIpYJl0wnB5HUPZkL_CGpXa5QvbgJz4N9DLYgFb960R7rmNg5mXbJOeiIw">Pankaj.Mandal@siemens.com</a> <mailto:<a href="/group/PipingDesign/post?postID=NdXloKwrYFZfHGPIuzXBZMP5firbqIpYJl0wnB5HUPZkL_CGpXa5QvbgJz4N9DLYgFb960R7rmNg5mXbJOeiIw">Pankaj.Mandal@siemens.com</a>> .

-----Original Message-----

From: <a href="/group/PipingDesign/post?postID=1xsvhsh_pJPqQZzVlNuJyb1hcJ7iZurC8QflF5pWWEAv_Lgn1lMsPLPfATf0h-Wja3Ycoxh0tsqcPFlKut8RNg">Rajesh.Balapure@ril.com</a> [mailto:<a href="/group/PipingDesign/post?postID=1xsvhsh_pJPqQZzVlNuJyb1hcJ7iZurC8QflF5pWWEAv_Lgn1lMsPLPfATf0h-Wja3Ycoxh0tsqcPFlKut8RNg">Rajesh.Balapure@ril.com</a>] Sent: 24 September 2003 10:53
To: <a href="/group/PipingDesign/post?postID=TYtm5HqKOQSoD8wCLgGL1Yyg8FfnZLP7yVqxeOM2CLFSZu0fDTeDm4v8QMMtvpX70cAUj-t9lQohGuXgkv8GfSjhTuLy">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] Strut 

                       SubrataP Saha

                                                To:       Rajesh V
Balapure/JAMNAGAR/RIL@Reliance
                       09/24/2003 10:45         cc:

                       AM                       Subject:  Re: [PipingDesign]
Strut
                                          Importance: Normal  Sender's OU:
Reliance |------------------|

| [ ] Confidential | 

|------------------|






                       SubrataP Saha

                                                To:
<a href="/group/PipingDesign/post?postID=TYtm5HqKOQSoD8wCLgGL1Yyg8FfnZLP7yVqxeOM2CLFSZu0fDTeDm4v8QMMtvpX70cAUj-t9lQohGuXgkv8GfSjhTuLy">PipingDesign@yahoogroups.com</a>
                       09/24/2003 10:44         cc:

                       AM                       Subject:  Re: [PipingDesign]
Strut

I would like to share an interesting interaction will a reputed vendor on piping struts about an year back.(the name I do not wish to disclose for obvious reasons).
With regard to the straight forward question as to whether the load capacities as mentioned in their catalogue is valid for both tension and compression, a prompt reply came that they are applicable in both directions. Subsequently a follow up query on a theoritical case whether a 3m long strut can behave like a shoe support if connected from bottom was put to them. This time the reply was not forthcoming and after followup we came to know that the matter was being discusssed by the specialists. But the final decision has not yet arrived and the catalogue values remain same.
I will leave at this stage and hope the group can very well figure out the reply on the basis of sound engineering judgement and not specious arguments.

Regards
S.Saha
FDC - Piping
Reliance Refinery
Jamnagar
India


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Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Wed Sep 24 01:57:00 2003

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