Re[2]: Trunnion on an Elbow

From: <Tushar>
Date: Mon Sep 09 2002 - 06:52:00 EDT

Hello Friends,

Use of trunion on elbow is generally accepted practice. Some companies do not allow at all and some companies do allow on conditional basis.

You can use it for temp. below 150 deg C (No problem at all.) But it's not good to use it above 150 deg C. The reason is simple that we can take advantage of flexibility associated with the elbow in stress analysis. Also I would suggest to avoid it above 60 deg C for Stainless Steel and Alloy Steel lines.

Better go for a support at the pipe (horizontal or vertical as well).

Thanks and regards.

Tushar Zope
Piping Engineer
Foster Wheeler Eastern Pte. Ltd, Singapore Ph: 6890 0837 Fax: 6223 2989

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Subject: Re: [PipingDesign] Trunnion on an Elbow Author: <a href="/group/PipingDesign/post?postID=Y5fgltOWZD8zNSne_jWP8avp6R_oaygRocXLLMurrWqkKJthna_QhPyiERFOFUtBeFI22PP79wQKpKzJYQ">Sachin_Bapat@ril.com</a> Date: 9/7/02 8:46 AM

        If you go through piping design books you will find that
        trunnion on elbow
        reduces the flexiblity of trunnion & also it modifies the value
        of sif &
        flexibility factor . piping design book (M W kellogg) chapter 4
        -local
        components   expilicitly derives relation for the same, thats
        why most of
        design companies dont prefer trunnion on elbows & use of pads
        for trunnion
        on elbow is highly discarded as all these reduce flexibility of
        trunnion ,
        which may be of concern in rigid layouts
        hope this answers your query.
        regards
        sachin





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Received on Mon Sep 09 06:52:00 2002