slacken compression fitting to bleed air ... BANG!

If the fitting had been made off Correctly, the Olive should had deformed the Tube and that would not of happened.

And where did you get 70Bar (that is over 1000 psi)

Baz

A properly fitted compression fitting doesn't allow the olive to 'slide off'

The entire system would explode with pressure anywhere near 70 bar. Mains is rarely above 3 bar.

This has got to be wrong, 70 PSI (pounds per square inch) maybe ?

Even this (70PSI) seems high.

(Many water boards only guarantee a minimum of 1 Bar (about 14.7PSI))

oops yes sorry I meant 70 metres of head - although maybe it's more likely to be 30.

We often get 80PSI here in Bristol (certainly always above 70PSI).

Mathew

On Thu, 08 Jan 2009 11:04:49 +0000 (GMT) someone who may be "Dave Plowman (News)" wrote this:-

The static pressure at my house is 4.5 to 5.5 bar depending on the time of day.

Dave Plowman (News) coughed up some electrons that declared:

Worst case I've seen consistently is 7.5 bar.

RobertL coughed up some electrons that declared:

That's 7bar and 3bar respectively.

The olive is not meant to dig into the pipe. Depending on the water system you have, you should have left the air in the pipe. IT acts as a shock arrestor, until it dissolves.

Are you sure? Here's a tool designed to slide off olives:

What force does the water and compressed air exert? 500,000 Pascals (5 Bar) * 2/10000 sq m (2 sq cm) =3D 100 Newtons.

So the force of the water in a slackened compression fitting is about the same as the force of an olive extractor. So it's quite posisble for a properly fitted fitting to blow off when slackened in this way.

Robert

Oh Yes it is!!

Baz

Agreed. Drivel keeps the olive in place by relying on the hacksaw burrs.

To be fair, on steel pipes, it doesn't dig in that far...

You need to get to know more about pipe fittings.

I doubt very much, that anyone on this NG knows any more than me about "Pipe Fittings".

For one you don't. Do you even know the difference between "Pipe" and "Tube"??

Are you the fool who had that silly thread going about "Push on Fittings" a few years ago?

Baz

Ferrules for Steel "Pipe" will have an "Edge" to bite into the "Pipe".

Baz

Please educate the uneducated of the group then Baz as to what is the main difference "between "Pipe" and "Tube"" as defined for plumbing and heatings applications (and if you wish, engineering as well [such as gas and oil conveyance]).

Unbeliever

Errm no. I have one and it takes a sh*t load of force to remove most olives. Usually a boc spanner on the tommy bar to get enough leverage.