I've got a couple of gas appliances which currently run at 50mBar input
regulated pressure.

To comply with a local law I need to operate them at 30mBar.

I can buy a 30mBar regulator no problem.

Question: can the gas appliances run safely at 30mBar or do the jets needs
to be changed to larger/smaller ones?

TIA

Lower pressure means bigger jets to get the same BTU output. You can get
the required new jets at your LPG supplier. This is a standard problem.
The jets are rated in BTU at a certain pressure.

Noone@home wrote:
I've got a couple of gas appliances which currently run at 50mBar input
regulated pressure.

To comply with a local law I need to operate them at 30mBar.

I can buy a 30mBar regulator no problem.

Question: can the gas appliances run safely at 30mBar or do the jets needs
to be changed to larger/smaller ones?

TIA

On Mon, 27 Oct 2008 09:24:43 -0500, RoyJ
wrote:
Noone@home wrote:

I've got a couple of gas appliances which currently run at 50mBar input
regulated pressure.

To comply with a local law I need to operate them at 30mBar.

I can buy a 30mBar regulator no problem.

Question: can the gas appliances run safely at 30mBar or do the jets needs
to be changed to larger/smaller ones?

Lower pressure means bigger jets to get the same BTU output. You can get
the required new jets at your LPG supplier. This is a standard problem.
The jets are rated in BTU at a certain pressure.

And resist the urge to drill out your existing jets till you have
called around for the proper replacements and/or tried other options
first. It can be done with a set of number drills, but it's not
easily reversible.

If you can't find replacements I'd machine a set of new jets and
drill them out larger. Check the threads - they usually use standard
pipe or bolt threads on the base of burner orifices, and you can use a
factory made (cheap) brass plug as your starting point. Screw it into
a pipe coupling or barrel nut, and then chuck that up in the lathe.

Because if the appliance is so obsolete you can't get repair parts
and you drill out your only set of working jets and mess them up, and
then you need to go back... that's when the fun /really/ starts.

-- Bruce --

And drilling your own is dicey at best. These things should be flow
rated, the tiny holes are VERY suseptable to burrs and similar defects.

Bruce L. Bergman wrote:
On Mon, 27 Oct 2008 09:24:43 -0500, RoyJ
wrote:
Noone@home wrote:

I've got a couple of gas appliances which currently run at 50mBar input
regulated pressure.

To comply with a local law I need to operate them at 30mBar.

I can buy a 30mBar regulator no problem.

Question: can the gas appliances run safely at 30mBar or do the jets needs
to be changed to larger/smaller ones?
Lower pressure means bigger jets to get the same BTU output. You can get
the required new jets at your LPG supplier. This is a standard problem.
The jets are rated in BTU at a certain pressure.

And resist the urge to drill out your existing jets till you have
called around for the proper replacements and/or tried other options
first. It can be done with a set of number drills, but it's not
easily reversible.

If you can't find replacements I'd machine a set of new jets and
drill them out larger. Check the threads - they usually use standard
pipe or bolt threads on the base of burner orifices, and you can use a
factory made (cheap) brass plug as your starting point. Screw it into
a pipe coupling or barrel nut, and then chuck that up in the lathe.

Because if the appliance is so obsolete you can't get repair parts
and you drill out your only set of working jets and mess them up, and
then you need to go back... that's when the fun /really/ starts.

-- Bruce --

Thanks guys.