Time Bomb Waiting to Happen!!

Come on lads, superglue and plastic pipes are rated to at least 10 bar, nice and light..

 

As an abstract point...


It's important to draw a distinction between pressure and force. *In general* excess pressure will make a fuel line split, or will cause leaks through a joint, but it's the force that would make a pipe *pop off*.

Many years ago a company called Mollins engineering were making hydraulic systems to be used to replacement mechanical limbs. The system worked at over 1000psi but the connectors were mostly push-fit, no clamps, nothing to secure them except friction and an O ring seal. The pipes had a very small bore, so although there was massive pressure there was a minute amount of force on the overlap on the joints. Remember it's only the "step" between the internal and external parts of a join that the pressure acts on to try and force the join apart - if the cross sectional area of it is small then the force is small.

So - if a pipe is of a tiny bore with a very small CSA on the join then even with massive pressure you can have push fit joints. However, a very large bore pipe with thick walls and thus a large step will need a great clamping force even when running at only a few psi.


I'm sure the above comments could be used by anyone to support *their* argument, they are not there to back up one side or t'other, merely a clarification of some of the terms being used.

 

What a fantastic thread

If your not happy with it dont do it. Simple?

A company such as Designa dubs should not be using such fixings of fuel pipes especially when your paying the premium of a proper job?

Why create another completey f*cking pointless thread about this sort of thing beats me.

 

Yeh my water injection pipes run push fit at 5 bar, 6mm i/d on proper barbed connectors.

 

I have worked for a company doing industry standard testing and a Jubilee clip on a fuel pipe is a no no.


They have an edge, which CAN damage the rubber.


They do not clamp evenly which CAN damage the rubber and the pipe they are connected to.


For small pipes (Like fuel) they can do more damage when tightening them up.


Just because nothing has happened does not mean it is safe, it may be the 1 time out of a hundred something happens but you are creating a possible problem area by not doing it correctly.


If it was perfectly safe, why do manufacturers, engineers etc spend more money on different fixings if they are not needed?


Dave!

 

Ooooh look, a fence. Mind if I sit down?

I don't understand all this female doging about might/should/could opinion; nobody could really argue that a little over engineering is a good thing where safety is concerned.

 

Is this only fuel lines we're talking about??As you can guess from my question i'm not that mechanically minded!!


I take it they are ok on coolant hoses??

 

[:^(]

 

Coolant hoses and brake lines should be made of plastic straws and tied
on with string.

 

Orange string

 

It was so obvious this thread was going to start, and if i had made a bet on who would of started it i would be quids in.... this pattern is seems to re-ocurring more often nowadays

Its all about the orange string mate

stef

 

What's wrong with sandwich bag ties?

 

zip ties

 

Boot laces??

 

Pipe cleaners
Edited by: Tuff Schmitt

 

Baler twine.

 

That's orange string where I live