[Jewelry making - Article 00835] - Re: [Orchid] How do you know you're running low?

[leonid Surpin]

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    Since I got some interesting emails off the list, I would like point
    out that what follows is my opinion only, and only for the purpose of
    the intellectual pursuit. It is up to every individual to decide on
    her own which practices to implement in conducting their business.
    Nothing which is to follow should be considered or interpreted as
    recommendation, or instruction, or inducement to act in any
    particular way. 

    All right, that should make my lawyer happy. 

    Mr. Miller and whoever still interested in the subject, 

    Let's assume we have a tank containing gas (any gas you want). The
    gas, for argument sake will be at 200 psi (that is pounds per square
    inch) Let also assume that we have regulator attached to the tank,
    and we have a torch attached to the regulator via hose. 

    As I understand, the concern is when tank is open and diaphragm is
    subjected to the initial pressure, it is o.k. in neutral position (
    no gas getting through ), but if it in deflected position (some gas
    getting through) that is somehow detrimental. 

    Let's explore both cases. 

    Scenario A: Diaphragm in neutral position. 

    when we open the tank, the diaphragm will be exposed to the same
    pressure as the tank walls. why? 

    Boyle's Law P1V1 = P2V2

    Since volume between diaphragm and the valve is minimal, we can
    approximate V1 = V2 and therefore P2 = P1. Consequently the diaphragm
    exposed to the same pressure as tank walls. 

    Scenario B: Diaphragm in deflected position. 

    when we open the tank, the diaphragm will be exposed to less
    pressure than tank wall. why? 

    The same Boyle's Law P1V1 = P2V2 

    however the volume between tank valve is not the space between valve
    and diaphragm, but also volume of the second chamber of the
    regulator plus volume of the hose attached. Since diaphragm in
    deflected position, by the corollary of the Gay-Lussac's Law of
    Combined Volumes, the V2 (combined volume) is larger and therefore P2
    is smaller. The diaphragm now is exposed to less pressure. As an
    additional benefit due to increased volume V2, build up of the
    pressure is slower due to amortization effect of gas from the tank
    initially expanding to the larger volume because of diaphragm in
    deflected position. ( there is no initial rush ) 

    I rest my case. 

    If someone wants to respond, please address issue factually. Do not
    quote manuals, recommendations, and etc. If you see a flaw in my
    logic, then pointed out, otherwise it does not make sense to
    continue.
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