Rank: Forum user 
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Hi
Just started a new role (Woop). We use several pressure pots (approx 7ft tall) to store acetone adhesive, the pots are 80PSI. There is a valve at the top the guys use to top up the pots, this valve can be opened at any time.
My concern is the human error of opening the valve when the pot is full. Is there such a valve out there that will not allow itself to be opened if there is pressure behind it? can any one suggest a good supplier or company in the mindlands / derbyshire area ideally, who would be able to advise and supply something like this?
Many thanks in advance
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Rank: Forum user
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Hi
Can you not apply a secure isolation and control the opening of the valve through a safe system of work?
Richard
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Rank: Forum user
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How do you isolate a pressurised vessel (pressure vessels are fairly new to me)? Id rather not rely on SSOW, this open up the human error potential. Id rather engineer out the risk with a clever valve.
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Rank: Super forum user
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The key aspect is the detailed method, including the design of the connected equipment (if any) through which the "pressurised vessel" is topped up. It is difficult to provide input without detailed information of the entire system.
If the "pressurised vessel" is at 80 PSI, then the Pressure Systems Safety Regulations 2000 apply
http://www.hse.gov.uk/pressure-systems/
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Rank: Super forum user
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Theoretically, one could have a safety interlock between the vessel being filled having a pressure sensor with the fill valve open/closed operation. However, a robust HAZOP needs to be undertaken prior to deciding for the safety interlock. There needs to be an assured level off reliability for the interlock elements to operate safely "all the time"
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Rank: Forum user
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quote=SimpleSafety]How do you isolate a pressurised vessel (pressure vessels are fairly new to me)? Id rather not rely on SSOW, this open up the human error potential. Id rather engineer out the risk with a clever valve.
Without knowing the full details i.e. the complexity, critically, in house capability etc.... it is difficult to provide further information.
Of course engineering out is the first port of call, however, my initial post was from the view point of their currently being no controls in place, as you mentioned the valve can be opened at any time. Therefore, due to the fact the appropriate studies, MOC and the likes all take time, it would be a worthwhile exercise to control the access to the equipment (issow) and install a secure isolation to the valve, therefore, reducing the potential of human failure. Once, it is controlled conduct the necessary studies.
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Rank: Super forum user
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And of course if it is acetone based you have to think about DSEAR
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Rank: Super forum user 
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It's conceivable that the vessels could be topped up by hand-pump via a one-way check valve. In short. you haven't given enough information to enable a discussion. The process could be perfectly safe.
Acetone - something like ABS jointing process then? Not acetate adhesive?
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