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TOPIC: Getting the branches from same location and ASME B31.3

10 years 7 months ago #7493

  • aubajwa
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Hi all,

Pls would somebdy would let me know ASME b31.3 criteria for having a two or more braches from a same location of the pipe.

Wonder if this is not going to make pipe less durable in terms of bearing the design pressure? Should the branches be repadded?

Scenario is:

Pipe size - 3 in SCH 40
design presuure - 5618 kPa
Temp - High 253 deg C ### Low 14 deg C

Two branches of size 50 and 25 are being take out from same point.

Regards

Re: Getting the branches from same location and ASME B31.3 10 years 7 months ago #4952

  • Jop
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aubajwa,
You have not given a reason for this arrangement so I will assume that you cannot move any of the two branch lines so the locations are mandatory.

So with that in mind I would consider one of the following:
1. Buy a 3" "Cross" (a forged fitting that has four outlets) then add a swedge or reducer for the 1" and 2" connections
For the Cross see: http://www.ecplaza.net/tradeleads/selle ... steel.html

or

2. Install a 3" x 2" Reducing Tee for the 2" outlet then install a 3" x 1" Socket-O-Let on the back side of the Tee for the 1" outlet
Do it once and Do it Right

Re: Getting the branches from same location and ASME B31.3 10 years 7 months ago #4953

  • aubajwa
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Hi Jop,

Thanks for ur repy.

I am afraid that you probably not got point in my question. I just want to know what "ASME B31.3" says on 'Getting braches out of single pipe from the same point.

I mean as we are going to remove material (from main pipe, as weldolet and reducing nippo flanges are used) in order to have branches. Is this not going to make pipe bit weaker around this area? Specially in case when the point is mear to vibrating equipment.

Kind Regards,
Asmat

Re: Getting the branches from same location and ASME B31.3 10 years 7 months ago #4955

  • Jop
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I stand with my original answer.
Do it once and Do it Right
Moderators: Jop
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