Relief's in place of burst disc's?

[mikeyg]

Reliefs in place of burst discs?

I like discussions like this. Learning all the time.

Pauls got a good point about explaining your argument (and health and safety is pretty damn serious).

[m2xt]

Reliefs in place of burst discs?

See http://www.fightingrobots.co.uk/discus/messages/9/1332.html?1077738986http://www.fightingrobots.co.uk/disc...tml?1077738986 for a more detailed explanation but in summary:

A failure mode of a regulator is to let by, thus pressurising the downstream low pressure components to full bottle pressure. This can be caused by foreign matter on the seat, a seat failure, scored seat etc. There are numerous manufacturers and types of pushfits, it would not be possible with any degree of confidence state at what over-pressure they will fail at. I have tested an 18 bar pushfit at 50 bar without failure. So, lets assume M2 has a regulator failure, the LP side pressure rises to 50 bar and the pneumatic system does not fail, I then fire the ram and no doubt a big bang as the ram explodes from mechanical failure. This is why M2 has always had a LP relief valve from day 1.

Another reason for the LP relief valve is to avoid the need for test pressure points. How does the tech checker know what pressure you are operating at? Simply by checking the LP relief valve certification.

Hope that helps explain some of the thinking behind the LP relief valve.

Paul

[Mouldy]

Reliefs in place of burst discs?

Ah ha!....when you put it that way id best get 1

Dave moulds
Team Turbine

sorry for the miss-understandings

[audrey_aka_leah]

Reliefs in place of burst discs?

Paul, as Dave had said, it did sound harsh and sarky, thats the only reason I was defending him, and sheesh... lighten up... :sad:

everybody knows about safety and other things, he was asking to verify what he wasnt sure about... as I dont know owt about bots NOR really give a monkey about, dont start lecturing me about whatevers because I DONT CARE!

[anukhet]

Reliefs in place of burst discs?

as I dont know owt about bots NOR really give a monkey about, dont start lecturing me about whatevers because I DONT CARE!

Audrey, is there something else you could be doing then?

[fluppet]

Reliefs in place of burst discs?

[Original comment removed, on the grounds that I might accidentally have caused offence.]

What could possibly be more fun than winding up roboteers? (Hmm, wind up roboteers... new category.)

Besides, I strongly suspect Audreys picked up quite a lot, in her time.

--
Fluppet

[m2xt]

Reliefs in place of burst discs?

lighten up, no thanks Audrey but thank you for your concern.

Paul

[Mouldy]

Reliefs in place of burst discs?

People the small row has endid. I think it would be a nice idea if this thread could be deleted but I dont have controll over that - Audrey I have nothing against Paul.

Dave moulds
Team Turbine

[fluppet]

Reliefs in place of burst discs?

Dont delete the thread - its useful information, and Dave asked a valid question. If we delete every thread where someone has said something which could be taken the wrong way, this forum would be a lot smaller (and less helpful). Hopefully everyone involved is sufficiently mollified that these posts wont cause further offence.

I should also apologise - in retrospect, my above post was unhelpful. I was trying to make light of the situation, realised what Id said could be taken the wrong way by third parties, removed it, left the note in case anyone had read the old version, and only just realised that the note made it sound as though Id had a rant at someone (which I hadnt). Teach me to stick my nose in on a thread with which I have nothing to do (although, since I have pneumatics plans, this is a useful thread to me.)

Time to duck out before I make matters worse, again.

--
Fluppet

[Mouldy]

Reliefs in place of burst discs?

hmmm, this thread sure got depressing quickly....On a happy(?) note this is my 100th post in the furom

Dave moulds
Team Turbine
Just trying to lighten the mood

[grant_ploughbot]

Reliefs in place of burst discs?

Well done dave, LOL.
These threads are helpfull to people like me who read around, gives you a wider range of knowldge and reminds you of past forgotten threads.
SUrely you cant maon at someone if they havnt noticed this topic before.
Oh and btw, im not at all moaning at ypu Paul, or anyone else on this thread, just a general thing for everyone to realise.
Grant

[audrey_aka_leah]

Reliefs in place of burst discs?

WAHEY!!! good on ya Dave!!

[simon]

Reliefs in place of burst discs?

What about if the fire valve is not in the bottle but is part of the valve system to fire the ram ? ( the old fire valve HP type system) would it be ok then ?

[fluppet]

Reliefs in place of burst discs?

Omigod. Back on topic! Big hand, Simon. :-)

--
Fluppet

[roger_plant]

Reliefs in place of burst discs?

I think that the H&SE people would get very upset if there was an accident caused or exacerbated by the lack of a standard bursting disc on a fire extinguisher bottle.
This accident could happen anywhere, at an event, during transport in your car or at your home.

Such an accident would undoubtedly not be covered by the either the event or your car insurance.

The busting disc is fitted to gas storage cylinders so that they don€™t explode when in a fire and kill anybody, like Firemen.

I dont have a copy to hand, but IIRC the RW rules always insisted in a bursting disc being fitted to all valves screwed into a fire extinguisher bottle for use in robots as well as the 1000 psi valve.

The LP side MUST have a safety relief fitted.
If a LP pipe or fitting bursts due to over pressure then the loose pipe will flail about and may well hit you in the face like a whip.
Its your face so fit YOUR LP safety valve.

I will not let robots into my event without both the standard bottle valve bursting discs and LP relief valves.

IIRC the RW 1000-psi relief valve was brought in to meet the demands of the Stage Hands Union, which forbade them to work on gas pressures over 1000 psi.

As we don€™t have stagehands belonging to a union, the H&SE requirement for a bursting disc is adequate for my Yeovil Robots-at-War, I don€™t require the 1000 psi valve to be fitted as well.


Dave, best leave the disc alone and try to fit the relief valves in somewhere, and save face that way.