Gas hob installation please help

[plumbdoctor]

Hi all
i am having a brain freeze moment got a gas hob have not fitted one for years ! Have a 1/2 inch male cylindrical connection, has fibre washer no nut, what fitting do i need so I can connect my 15mm copper to it ? Cos obviously a normal nut and olive would not work.
Cheers peeps

 

[Dotty]

1/2" female iron to copper.

 

[JAH HEATING]

Do you use conex with it being behind the oven ?

 

[plumbdoctor]

It says you can use flexible pipe but I'm not wanting to use that, cheers croppie knew it was something simple just the fibre washer it comes with and the thread three me off track

 

[plumbdoctor]

How do u post pics on here ?

 

[JAH HEATING]

Using a flex on a hob is a no no ???

 

[dancinplumba]

If mi's state cooker hose is ok then its ok

 

[REDSAW]

mines on a flex!!

shouldhave seen the gs inspectors face when i showed him, lol

depends on mi's

 

[JAH HEATING]

Well I never knew that, always thought it had to be rigid

 

[REDSAW]

generally for good practice, yes!

unless proven otherwise, ie; on a l.l.c i would fail it unless the m.i's were there and said other wise.

 

[plumbdoctor]

This is similar to to I have

 

[plumbdoctor]

You sure you can connect onto it with 1/2 female iron to copper ?

 

[JAH HEATING]

That's all I use, or m.i to copper

 

[Reg Man]

You need the fibre washer, because an traditional MI X Copper has a parallel thread and the hob connection is also a parallel thread, so you will not get a good joint Parallel to parallel unless you use the fibre washer. Common mistake that leads to many hobs leaking on the connection. As previously stated, a flexi is ok if the MI's say so, but not usual practice, I always prefer a ridged pipe.

 

[dancinplumba]

You need the fibre washer, because an traditional MI X Copper has a parallel thread and the hob connection is also a parallel thread, so you will not get a good joint Parallel to parallel unless you use the fibre washer. Common mistake that leads to many hobs leaking on the connection. As previously stated, a flexi is ok if the MI's say so, but not usual practice, I always prefer a ridged pipe.

What's ridged pipe

 

[clarky101]

What's ridged pipe

It's what my bender does to copper pipe.....

 

[Reg Man]

What's ridged pipe

Yes terrible spelling, must try harder.

 

[plumbdoctor]

Thanks guys so as long as I use the fibre washer supplied with a female iron and either gas ptfe or gas jointing compound I should be ok ? Never new about the washer cheers reg man

 

[ManchesterGas]

You don't need ptfe or gas jointing compound with a fibre washer

 

[Mike Jackson]

I'm now using BES item number 12880.

 

[plumbdoctor]

Looks good mike still use a fibre washer ?

 

[mutley racers]

no washer, it is a threaded joint. so just a bit of gas ptfe i reckon

 

[stevetheplumber]

i always use a fibre washer in the female iron and a smear of paste for luck as said they are parralel threads and paste alone isnt sufficent
to the OP the supplied fibre washer is for the loose nut connection to the hob you need another for the f/i

 

[mutley racers]

Well I never

 

[JAH HEATING]

I always use paste

 

[ManchesterGas]

Steve, they normally they come with 2 fibre washers, 1 for each side of the ally elbow

 

[tamz]

Throw the male elbow away an use a 1/2" x 15mm bent male. You still need the washer.

 

[Reg Man]

Taper thread on to parallel thread with paste or unsintered PTFE ok. Parallel thread on to parallel thread is a definite no no unless you have a washer.

 

[plumbdoctor]

Fitted it today with washer, all fine cheers guys

 

[AWheating]

one thing to remember is that even tho the manufacturer may state its ok to use a flexible hose the hose must not be exposed to high temps and hang free and with no strain. So if there is a oven fitted underneath you must be certain that the hose does not touch a hot part of the oven or get to hot in the void space, or get put under strain. As most ovens use this space as a vent/cooling route i would say that your better going with copper to be sure.