Crimped clips for flexible hose on lpg installation

[pagoda]

In general they are not supported for use on small diameter hoses because the worm drive can easily jump and lose grip giving a poor seal. This is because on the small diameter clips only one or two teeth are engaging compared to the larger diameters where many teeth engage. Brands like Jubilee are better quality and this is not an issue. There have been cases where the clip does grip but is then overtightened significantly, just in case it jumps, and then the hose is crushed. This causes an increased probability that the hose will tear at the interface between the clamped and unclamped part. That is what was explained to me, many moons ago. I think though that low quality clips and insufficient clamping pressure is the primary reason.

fIne, almost agreed. At 25 to 35 mBar -downstream of regulator, exactly how much clamping pressure is needed for a decent seal? Securing of the hose and of the bottle strike me as rather more important than worrying about crimps compared with worm drive clips. And less so if you replace the hoses every 3 years?

 

[Daverw]

I’m struggling to understand a debate over using pig eared clamps about 30p against jubilee clamp £1, we are talking about possible gas leakage and a serious situation. Sometimes think we loose the point.

 

[gertha]

For a professional, all gas work is covered by the British Standards.
Best you employ a suitably qualified professional.
But he is not going to tell you how to do the job, or he will be out of business

 

[JumbleDuck]

I’m struggling to understand a debate over using pig eared clamps about 30p against jubilee clamp £1, we are talking about possible gas leakage and a serious situation. Sometimes think we loose the point.

Which type do you think should be used?

 

[Halo]

I bought the clips and pincers tool with the hose from calor in Preston. Worked fine and I have some excellent pincers in my workshop which work well on nails etc. Why not just buy the recommended items? After all gas on boats is not something to bu**er about with

 

[Momac]

Why not just buy the recommended items? After all gas on boats is not something to bu**er about with

The pincers are not too expensive on the following website. However it looks like the clips are not stainless steel.
https://www.bes.co.uk/natural-gas-lpg/lpg/hose/clip-and-pincers
.

 

[<152587>]

This thread is typical, barrack room mechanics imparting dubious advice.
The installation of LPG systems is covered in an ISO document, read it!

Any form of spring clip is strictly prohibited.

Worm drive and crimp clips are recommended.

Specific advice is given as to the sizing and securing of worm drives to prevent distortion.

 

[JumbleDuck]

This thread is typical, barrack room mechanics imparting dubious advice.
The installation of LPG systems is covered in an ISO document, read it!

A bargain at CHF88. https://www.iso.org/standard/60148.html.

 

[Little Dorrit]

This thread is typical, barrack room mechanics imparting dubious advice.
The installation of LPG systems is covered in an ISO document, read it!

Any form of spring clip is strictly prohibited.

Worm drive and crimp clips are recommended.

Specific advice is given as to the sizing and securing of worm drives to prevent distortion.

The reason for starting this thread was that having read the boat gas safety scheme document I couldnt see anywhere where jubillee style clips were deemed to be unsuitable so just wanted to ask what the acceptable clips were. It was not meant to be an opportunity for people to suggest what are clearly unacceptable forms of securining an lpg hose.

 

[Daverw]

Which type do you think should be used?

The correct clamps will be the one that does not distort the pipe, have a reliable way of controlling the torque and satisfies the relevant regs, to me this would be stainless pig ear clips. Probably the reason that they are standard in most industries for small bore pipe connections.

The problem I see with worm drive clamps is how tight they need to be, most people fit them, tighten, look for a leak then tighten a bit more. Not and ideal way with gas.

 

[VicS]

The correct clamps will be the one that does not distort the pipe, have a reliable way of controlling the torque and satisfies the relevant regs, to me this would be stainless pig ear clips. Probably the reason that they are standard in most industries for small bore pipe connections.

The problem I see with worm drive clamps is how tight they need to be, most people fit them, tighten, look for a leak then tighten a bit more. Not and ideal way with gas.

They should be tight enough to prevent the hose being pulled off the nozzle.

 

[Daverw]

Would that always ensure gas tight.

 

[NormanS]

Would that always ensure gas tight.

What pressure do you think the gas is at?

 

[Daverw]

Yes the pressure is low 30mbar, but leaks can be due to scored internal bore or poor pipe tails. Mechanical joints are the most common leak points for gases.

 

[pvb]

Mechanical joints are the most common leak points for gases.

That's surely self-evident?

I'm quite happy to use decent jubilee-type clips on low pressure hose. If Calor themselves are happy to sell them, they can't be that bad - https://www.calor.co.uk/shop/calor-essentials/essentials-low-pressure-hose.html

 

[VicS]

That's surely self-evident?

I'm quite happy to use decent jubilee-type clips on low pressure hose. If Calor themselves are happy to sell them, they can't be that bad - https://www.calor.co.uk/shop/calor-essentials/essentials-low-pressure-hose.html

Thats interesting ............. orange low pressure hose.

 

[Little Dorrit]

Thats interesting ............. orange low pressure hose.

This is what I bought for my new lpg installation. Not acceptable according to the Gas Safe engineer who checked everything for me. Jubilee clips a no no!

 

[VicS]

This is what I bought for my new lpg installation. Not acceptable according to the Gas Safe engineer who checked everything for me. Jubilee clips a no no!

What's not acceptable? Orange hose for LP use ( its about all you can get from small outlets) or the Jubilee clips

 

[pvb]

Not acceptable according to the Gas Safe engineer who checked everything for me. Jubilee clips a no no!

He's talking rubbish.

 

[Little Dorrit]

What's not acceptable? Orange hose for LP use ( its about all you can get from small outlets) or the Jubilee clips

I am not dissing the engineer he was clearly compitent, a nice guy and in no way out to profit from any shortcomings. I certainly have no reason to ignore his advice.

What baffled me I think, was that there was no mention in the Small Boat Gas Safety booklet about not using jubilee clips. I actually had the booklet printed and read it dilligently ( I'm sad that way).

I said to the engineer when he arrived 'I have followed all the advice and recommendations in this book'.

After checking everything and finally, for any pressure loss, he said everything was perefectly acceptable and all ok but that Jubilee clips were not 'really' acceptable as a way of sceuring flexible hose. Shortly after he referred to the booklet and said 'It should be in there'. He had a quick look but couldn't find any reference to it...and then moved on.