Older Sievert Gas Torch Advice Needed

[Clive FosterParticipant @clivefoster55965]

Recently picked up a brace of older style Sievert gas torches with several burners in decent used condition and looking for advice on what I have, set-up, care and cleaning. A quick check following visual inspection shows no leaks, although the connecting hose is clearly towards the end of its life and will be replaced, and the burners do light up OK..

1) Nothing looks abused or overly used, the meshes at the screw end of the burners are clean but the flat sealing washers are grooved and look a somewhat old. Presumably replacing the seals would be advisable. If so where can I get them and is there anything else which should be done or changed?

2) Burner type numbers are old style 4 digits whilst current ones have 6. Several have numbers common to the current range and look the same:- 2941, 3537, 3939, 3941. Can I assume they are, for practical purposes, to the same specifications as the current types.

3) Three of the burners don't appear to have direct number read across to modern numbers:-

2940 which has a thick tube about 3/4 inch O-D and 1 1/4 inches long with a swaged in end fixed to the burner proper by a single side screw

2950 which looks to be a cyclone burner being a 5 inch or so long curved tube with air inlet at the base and burner at the top.

46573 which as a flattened end fishtil style tube held ahead of the burner by a single screw and a shroud over the air inlet holes at the base of the tube close to the torch fitting.

4) There are no numbers of the torches. The smaller one is a has a hard, glossy handle (bakelite?) with Sievert Original moulded in. Original in very cursive script. Control knob is brass. The larger one has a more modern style black plastic handle of matt appearance and plastic control knob with sheet aluminium insert for the on-off logo. Are these till safe to use if in apparently good condition after careful visual inspection? Are there any seals et al which should be changed?

5) The gas connector screws direct into the bottle with a rotatable connector assembly identified by a transfer carrying the number 3085 and instructions in Swedish (presumably) and English. English is "Push to Re-Open" so I assume this is a line rupture safety valve. Can I assume this is still fully functional?

6) There is no regulator with the set I have so is it OK to use direct off the bottle or should I obtain a regulator unit (with line rupture valve?) before putting into service? It appears that 2 bar is an appropriate pressure for all the burners that have modern equivalents. I've always felt that a system with a regulator is safer and more predictable in performance.

Thanks for any assistance.

Clive

[Clive FosterParticipant @clivefoster55965]

[CuP AlloysParticipant @cupalloys]

Hi Clive

Burner washers are readily vailable.

Burners 2940, 2950 and 46573 are obsolete.

The bakelite handle was last made some 25 yearsago. The fittings on new hose are not compatible. Hoses are available however for the other handle.

Are what you have safe? Carry out your own safety checks for leaks. Soapy water around any joints will show leaks by bubbles appearing.

I believe 3085 is an old hose failure valve.

You need a regulator to connect to your gas bottle.I suugest you get a variable 1 – 4 bar. They give you greater heat output which becomes more apparent on bigger burners. For example the 2944 will generate 80 plus kw at 4 bar but about 40 at 2 bar. Heat output is dependent on the volume of gas being burnt. Increase the pressure and increase the volume of gas. Suggest you obtain the regulator used by Sievert for their starter kit. Its good and costs less than the Sievert branded one!

More information to make an informed choice is available via our website.

regards

keith

keith

[Author]

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