reinforcing pads as per 13480 or sockolets?

[kongsin_CYMRU]

Morn, I need some support with a calculation in 13480:3. We have had a failure on a 1" socket off a 10" natural gas main. We want to initially replace it like for like, but someone has questioned whether it needs a reinforcing pad. I have done the calc in excel for eq 8.4.2-1 and it confirms it should have a pad. Has anyone else experienced a small socket needing a comp pad of a relatively large main,

it has also been suggested that a sockolet be used - my only problem is that we're unable to volumetrically test this weld as it will be a full pen weld. what have others done in past to prove to thier insurers on testing. would mpi of root and cap suffice?

 

[Krausen]

Using a sockolet is much more common than a repad in this case. The sockolet is an integrally-reinforced fitting. You can still x-ray (RT) the full-pen branch weld to check for weld defects, but yes I don't believe you can qualify this weld via x-ray (RT) or UT volumetrically. Yes, mpi of root & cap passes (surface NDE) always in this case. Also you will pressure test (hydrotest) this full-pen branch weld too I assume.

 

[XL83NL]

You can RT the weld of the sockolet to the main header but can touch get an actual decent picture from it? I’ve always been thought olets don’t allow for meaningful radiographs.

 

[Krausen]

You can't fully evaluate the sockolet weld to main header with an RT. But you can often still get some idea of weld quality. You can also check for your socket gap after welding if curious. It's not useless to RT sockolet to main header welds.

 

[kongsin_CYMRU]

Using a sockolet is much more common than a repad in this case. The sockolet is an integrally-reinforced fitting. You can still x-ray (RT) the full-pen branch weld to check for weld defects, but yes I don't believe you can qualify this weld via x-ray (RT) or UT volumetrically. Yes, mpi of root & cap passes (surface NDE) always in this case. Also you will pressure test (hydrotest) this full-pen branch weld too I assume.

a pressure test is impractical because of distance of flanges but we will suggest bombing to support

 

[kongsin_CYMRU]

You can't fully evaluate the sockolet weld to main header with an RT. But you can often still get some idea of weld quality. You can also check for your socket gap after welding if curious. It's not useless to RT sockolet to main header welds.

what is the socket gap?

 

[kongsin_CYMRU]

You can RT the weld of the sockolet to the main header but can touch get an actual decent picture from it? I’ve always been thought olets don’t allow for meaningful radiographs.

yes the sockolets have not been reviewed in too much detail before but we cant pressure test in this case so need to agree a staged inspection process to get signed off. i think we will try xray to understand what we can see

 

[LittleInch]

The pipe going into the socket should not rest on the base of the socket but have a small gap (1.5mm).

See this and scroll down a bit. https://hardhatengineer.com/sockolet-and-sockolet-dimensions/

The RT can identify that this has actually occurred

 

[kongsin_CYMRU]

The pipe going into the socket should not rest on the base of the socket but have a small gap (1.5mm).

See this and scroll down a bit. https://hardhatengineer.com/sockolet-and-sockolet-dimensions/

The RT can identify that this has actually occurred

thanks for link