[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Aquatic Plants Digest V4 #660
Operating pressure range and MAWP ( maximum allowable working pressure )
are two very differnet parameters of a regulator. If the tank regulator
fails ( and they do ) your downstream regulator better be rated for the
full tank pressure ( 860 psig ). Either that or you need a pressure
relief device inbetween them. What is the design pressure or mawp of
your ARO regulator?
I have stated this before, but it warrants repeating. You have to look
at your entire pressure circuit and determine your weak link and make
sure you are adequately protected. Installing a "cheap low-pressure"
regulator downstream of a high pressure source is very dangerous. Most
cheap low pressure regulators are typically only good for 150 psig or
less. A diaphram failure in the high pressure regulator is a very
feasible event. 860 psig is enough pressure to impart significant
velocity to regulator fragments........
Again I strongly recommend that you understand your design pressures,
people have been killed by overpressurized regulators coming apart.
Aquatic Plants Digest
>I have to disagree with you on your cost projection for the avoidance
>approach. As I have posted previously, I use a second mini-regulator
>downstream of the primary tank regulator. You don't need a special
>high-pressure regulator so the mini-regulator is well within its operating
>pressure range to regulate the 35 psig from the tank to 2 psig to the needle
>valve manifold. The specific equipment I have in use on three systems right
>now is the ARO model #127112820. Total cost (three years ago) was around
>$30 including the gauge and fittings. This is MUCH less than $100 - $300.
>I'm sure there are other equally suitable regulators available in a similar