LDF masking gas Leaks

[richard978]

I work for a gas transport company as a FCO, been out to a SOG at meter and initial tightness test produced 11mb drop. I sniffed it out to a joint and sprayed with LDF which produced some spawn but then stopped.

Second tightness held completely and failed to pick any readings from the same joint.

Has anyone heard of LDF masking such a large leak because it’s the first time for me

 

[Riley]

I’d be surprised if it masked 11mbar

 

[firemant]

Where was the reading in relation to the ECV? More likely to be intermittent escape on ECV. (opening and closing redistributes grease)

 

[richard978]

Where was the reading in relation to the ECV? More likely to be intermittent escape on ECV. (opening and closing redistributes grease)

No checked ecv, it was definitely that jount. Left it to dry out and 47 LEL reading. Third test 11 mb drop.

Ecv leak won't show on TT anyway think about it.

I just not experienced anything like it

 

[ShaunCorbs]

11 mb drop is a fitting that hasnt been soldered so ldf wont make a seal / solve it

wasnt a sunny day was it?

 

[Burger]

How quick did it drop? Appliances off?

 

[firemant]

No checked ecv, it was definitely that jount. Left it to dry out and 47 LEL reading. Third test 11 mb drop.

Ecv leak won't show on TT anyway think about it.

I just not experienced anything like it

,

Yes, it can. On an old tap, and depending on the distribution of grease at that particular time.

 

[Burger]

I work for a gas transport company as a FCO, been out to a SOG at meter and initial tightness test produced 11mb drop. I sniffed it out to a joint and sprayed with LDF which produced some spawn but then stopped.

Second tightness held completely and failed to pick any readings from the same joint.

Has anyone heard of LDF masking such a large leak because it’s the first time for me

Thought about it for a while, I knew an engineer who had a massive drop. He sprayed every visible joint using a cheaper ldf. He called another engineer who had a more expensive brand, and found it on one of the joints he’d already sprayed, a hairline crack on an elbow.

 

[firemant]

Oh, for days of Fairly Liquid

 

[DGT plumbing]

Oh, for days of Fairly Liquid

They still make Fairy Liquid you know, they use it for washing pots now apparently.

 

[firemant]

They still make Fairy Liquid you know, they use it for washing pots now apparently.

]

Really? Does it not corrode the saucepans?

 

[richard978]

It was a poorly made joint, and LDF was enough to stop it .

It goes to show the limitations of the tightness test and on low pressure gas.

Thankfully we are given test equipment that is able to find these things.

 

[DGT plumbing]

]

Really? Does it not corrode the saucepans?

Only copper ones.