Modification of elbow 2

[iliyaz3]

Is modification of elbow like changing the long radius to short radius affects its strength ???

 

[MikeHalloran]

You can't do it with the same elbow.

If you wish to know about substituting one elbow for another, that depends on what you are doing with the elbow, and you haven't given us a clue about that.


Mike Halloran
Pembroke Pines, FL, USA

 

[iliyaz3]

We modified the long radius elbow by cutting to a length of 30 mm from both sides just to make a space according to site condition.Is this affects the strength of elbow. Also suggest me ASME standards for such modifications to refer.

 

[LittleInch]

"both sides??". Can you draw what you've done please

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[iliyaz3]

Find the attached drg fyr

 

[Gator]

There's a fundamental misunderstanding here or OP is a joke.

Piping Design Central

 

[LittleInch]

Iliyaz3,

I think most people are thinking of asme b16.9 LR elbows like this

http://www.piyush-steel.com/buttweld-asme-b169-90-long-radius-elbow.html

where the elbows end at the exact end of the bends.

However you can get LR elbows with extended tangents aa single item which you seem to have.

In this case yes you can cut the ends of the straight bits back as you require.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[MJCronin]

Yes

MJCronin
Sr. Process Engineer

 

[Shmulik]

iliyaz3,
Translating your aim to simplest words is: making a short-radius elbow dimensions out of a long-radius elbow.

According to ASME B31.3 the elbow becomes Unlisted Component, thus, it may be used but the limitations and requirements of 302.2.3 + 304.7.2 shall be met.

Please note that if your elbow's angle will remain of 90° - the new ends section you going to get will not be round, since B16.9 elbow does not have ends straight sections of 30mm as it seems from your sketch.

The only operation permitted by ASME B31.3 for ASME B16.9 fitting is angular adjustment of joint offset as follows:

328.4.2 (b)(6): "Buttweld fittings manufactured in accordance with ASME B16.9 may be trimmed to produce an angular joint offset in their connections to pipe or to other buttweld fittings without being subject to design qualifications in accordance with para. 304.7.2 provided the total angular offset produced between the two jointed parts does not exceed 3 deg".