Pressure testing 63mm gas pipe

[mutley racers]

I have been asked to pressure test and cap of 12metres of 63mm yellow gas pipe that is in a trench. Nothing is connected to either end.

Pressure testing to 10 bar should be fine hey?

 

[ShaunCorbs]

i would say you need to be qualified then

 

[Last Plumber]

Will I get those from whoever suggested putting in a 63mm pipe?

Gas Transporter will know MIP.
The Gas installer/Gas installation designer will Know MOP but Gas transporter will know it too.

 

[Scott_D]

If you are issueint some sort or test certificate I think you should have commercial
If you are just testing for peace of mind, maybe not, who fitted the pipe? Is it to the correct depth? Will it be correctly buried etc?

 

[mutley racers]

If you are issueint some sort or test certificate I think you should have commercial
If you are just testing for peace of mind, maybe not, who fitted the pipe? Is it to the correct depth? Will it be correctly buried etc?

No no test certificate needed. Will check depths etc when there. The pipe is sleeved in yellow corrugated pipe.

 

[Last Plumber]

Edit:

 

[mutley racers]

So this is what I need to test and cap this pipe. Quite a lot of fittings.

1 x philmac 63mm end cap
1 x primofit adaptor 63mm compression to 2 inch bsp Female
2 inch x 1 inch brass reducer
1 inch male iron to 22mm compression and some copper tube. Test, then cap the test point.

 

[Scott_D]

So this is what I need to test and cap this pipe. Quite a lot of fittings.

1 x philmac 63mm end cap
1 x primofit adaptor 63mm compression to 2 inch bsp Female
2 inch x 1 inch brass reducer
1 inch male iron to 22mm compression and some copper tube. Test, then cap the test point.

That’s why commercial guys charge loads
I know Shaun and Last plumber use £50 notes as bog roll.

 

[mutley racers]

I am charging 2 days to just go and test this plus the parts. It is down in Margate so should be half a day there, back and testing.

Trouble is finding places that stock these fittings. BES do but then I need to wait for a delivery and was hoping to get down there tomorrow.

It has taken me 2 days to research fittings due to work, wife and 3 kids at home all being rather demanding.

I need to take more dump breaks at home I think!

 

[ShaunCorbs]

Bss will have stock / they should

 

[mutley racers]

Bss will have stock / they should

Just writing them a materials list now. Fingers crossed

 

[mutley racers]

Bss will have stock / they should

Unfortunately they are not a stock item.

 

[ShaunCorbs]

Try sbs smith brothers there London area

 

[mutley racers]

If you are issueint some sort or test certificate I think you should have commercial
If you are just testing for peace of mind, maybe not, who fitted the pipe? Is it to the correct depth? Will it be correctly buried etc?

i would say you need to be qualified then

Turns out A certificate is required for the soundness of this length of pipe.

Still would have thought I could test this as it is just an empty carcass?

 

[Last Plumber]

Turns out A certificate is required for the soundness of this length of pipe.

Still would have thought I could test this as it is just an empty carcass?

Did you find out the MIP & MOP yet?

 

[mutley racers]

Did you find out the MIP & MOP yet?

I contacted the network and they said I need to do an online form which can take 2-3 weeks to come back as the pressures going to individual properties is different. I am thinking this is not correct hey.

 

[ShaunCorbs]

I contacted the network and they said I need to do an online form which can take 2-3 weeks to come back as the pressures going to individual properties is different. I am thinking this is not correct hey.

Yep most places I work are around the 50-75 mbar mop but mip can vary anywhere from 75mbar to 1 bar depending on what's around

 

[mutley racers]

The STP is determined by the MOP or MIP. It has little to do with pipe sizes or volumes. On a std low pressure supply the MIP will be 75mb. STP will be 1.1 x MIP which in this case is 82.5mb. Test duration (for any size pipe) is 5 minutes stabilisation + 5 minutes test. 20% pressure loss is allowable with a pneumatic test and 5% if hydrostatic testing.

On bigger systems at higher pressures (again any size pipe), if the MOP is say 2 bar the STP would be 2bar x 1.5 = 3bar tested for 10 minutes stabilisation plus 5 minute test with the same drops allowed.
Taking it to the extreme with a MOP of 16bar the STP is 16 x 1.5 = 24bar. Hydrostatic test only, stabilise for 30 mins test for 30 mins with a 5% allowable drop.

(IGE/UP1)

 

[mutley racers]

The STP is determined by the MOP or MIP. It has little to do with pipe sizes or volumes. On a std low pressure supply the MIP will be 75mb. STP will be 1.1 x MIP which in this case is 82.5mb. Test duration (for any size pipe) is 5 minutes stabilisation + 5 minutes test. 20% pressure loss is allowable with a pneumatic test and 5% if hydrostatic testing.

On bigger systems at higher pressures (again any size pipe), if the MOP is say 2 bar the STP would be 2bar x 1.5 = 3bar tested for 10 minutes stabilisation plus 5 minute test with the same drops allowed.
Taking it to the extreme with a MOP of 16bar the STP is 16 x 1.5 = 24bar. Hydrostatic test only, stabilise for 30 mins test for 30 mins with a 5% allowable drop.

(IGE/UP1)

I am guessing as the pipe is only able to carry 5.5bar the pressure test is not going to be 24bar?

 

[ShaunCorbs]

I am guessing as the pipe is only able to carry 5.5bar the pressure test is not going to be 24bar?

thats your max gas pressure not the max pressure the pipe can take i would be surprised if you over 75mbar op

 

[ShaunCorbs]

eg of the calcs below

 

[mutley racers]

eg of the calcs below

View attachment 35986

View attachment 35987

Wow no way, 257 minutes stabilisation and tt.

Thanks for sharing Shaun.

 

[ShaunCorbs]

Wow no way, 257 minutes stabilisation and tt.

Thanks for sharing Shaun.

each so around 10 hour test due to guage set

 

[mutley racers]

Yep most places I work are around the 50-75 mbar mop but mip can vary anywhere from 75mbar to 1 bar depending on what's around

So a 3 bar test should be ok then hey

 

[ShaunCorbs]

Depends on spec of pipe

 

[mutley racers]

Reading treloar gas book commercial side. The tightness test is quite something

 

[ShaunCorbs]

Reading treloar gas book commercial side. The tightness test is quite something

Have a look at purging

 

[mutley racers]

Have a look at purging

Hehe. I kind of skipped that one. My bed time reading now is specification of gas sdr11 pe pipe

 

[mutley racers]

So reading the pipes testing procedure for gas, it says to reduce temperature effects the trench must be backfilled. That is surprising

 

[mutley racers]

I contacted another department today a d all they could tell me in that area it is all low pressure installations which will supply a MOP of 19 to 21mb. Does this help?

 

[ShaunCorbs]

Ask what the supply pressure is eg before reg