Maximator Booster Pump

abowie

You did better than me.

I was unable to contact Henry Masdon; the email address above bounced over a couple of days; inbox full.

I tried the Maximator site in Germany and as yet have received no reply.

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Andrew Bowie

Rebreather-friendly Buddy

DrJM

Mike

A friend in France got a M22 second hand and open it, lubricate with O2 compatible oil "voltalef" and used it now for 8 month to boost o2, and he is still alive ....

Rgds

Jerome

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Deep Cave Exploration

macdiver

UKSteve,

First of all, nice pump & setup. Also good job on writing the article.

From the pictures it appears that you have fire extinguishers nearby. A good idea when dealing with oxygen. However, the extinguishers are located behind the tanks and pumps and would be inaccessible if needed. You may want to move them to the other side of the room, close enough to reach quickly, but not blocked by the fire.

Funny what things jump out at different people. Hopefully you don't mind the advice.

Mark

Drmike

Thanks Jerome,

I just thought it odd (seeing as Maximator do make O2 rated booster pumps) why they dont support this particular model for O2 boosting.

BTW does anyone know what is Mark selling these 'converted' pumps for?

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Cave diving is a sport
Wreck diving is a sport
Diving in general is a sport

'Rebreather diving' is not a sport
its the delusional obsession with a highly dangerous and often inappropriate piece of equipment

UKSteve

Thx for the advice...and a good point. However, they are actually junk that is sitting in the compressor hut! Been there for years and no-one quite knows now where they came from!! We really should get rid of them...We have two proper ones at the door to the compressor hut howeverr.

On that subject, anyone know what kind of extinguisher would be best on a fire involving a supply of pure oxygen? In terms of the fire triangle (oxygen / fuel / heat) I guess first step would be to isolate the oxygen supply then addresss the other two. As almost anything will start to burn in an oxgen fed fire and hopefully there is very little hydrocarbons in the vicinity, I guess the best bet once the oxgen supply is stopped would be water - and lots of it!!

Steve

UKSteve

UK £500 - 600 depending on who you are and what batch they are from.

Steve

UKSteve

One problem I have had using the pump is to control the speed accurately - recoemmended at 1 stroke per second. When using a HP air supply (cylinder or the compressor bank) the currnet method is to throttle the supply to the regulator 1st stage by just cracking the cylinder valve or filling whip valve. This leads to a big pressure drop across this valve and consequentially freezing.

I have been looking for a low pressure (15-20 bar) needle valve that could be screwed into the drive gas inlet orifice (3/8" UNF) or placed in the low pressure hose. This would allow the HP valves to be opened fully and should reduce the freezing.

I would imagine a lab instrument air needle valve would work but despite the wonders of google have not been able to locate one. Anyone got any suggestions?

Steve

abowie

Running away very fast would be my preferred method.

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Andrew Bowie

Rebreather-friendly Buddy

PeteS

In the event of fire what steps are you going to take?

F*****g big ones.......

The old jokes are still.... the old jokes.

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Pete S.

http://www.steggle.co.nz

Every silver lining has a cloud

iain-hsm

Steve.

From the post I have read this product is clearly NOT SUITABLE FOR OXYGEN SERVICE. Your concern should be regarding its application with oxygen as it is clearly not designed or suitable. Go to the supplier and get him to issue you with a copy of the certificate of test and the CE certificate. Also get a copy in writing as to its suitability in oxygen to this specific inlet pressure and outlet pressure you claim. Have they shown you evidence of Bomb testing in pumping oxygen with this product.

While you are waiting for this I would suggest a non return valve on the BOC inlet storage bottle as well as on the outlet side of your pump. That way you are not feeding the oxygen fire when it arrives. Further add at least a 1.2 meter (4 foot) coil of Tungum tube (Alpha brass) after the BOC storage bottle and also another before the SCUBA bottle being filled. That way you have minimized the fire propagating down the PTFE liner of your filling whips creating what is known as a flexible thermic lance in the event of a adiabatic pump fire. Also look to revise your household fire policy. Iain Middlebrook