Thread: SCBA Pressures

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    Default SCBA Pressures

    I got asked a question that stumped me today...I am hoping some experts on here can help me help him.

    What is the exiting pressure from the primary regulator and then the pressure exiting the facepiece regulator.

    Thanks!
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    FIRST STAGE REGULATOR
    The first stage regulator is a pressure reducer that keeps the pressure to the mask mounted regulator at approximately 80 to 100 psig throughout the entire operating pressure range of the cylinder. The regulator has a redundancy feature to minimize the possibility of a first stage failure. The regulator uses a large sintered filter which is easy to replace. The filter captures particulates that may be in the air stream.


    http://s7d9.scene7.com/is/content/mi...anual%20-%20EN

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    Reduces cylinder high pressure to low pressure before it reaches the second stage regulator||Pressure relief valve actuated at 125psi on low side then re-seats High pressure side allows unrestricted flow to Control Module
    Second Stage Regulator Pressure on demand type regulator maintains pressure slightly above atmospheric in facepiece Inhale sharply to activate||Red bypass to bleed or provide continuous air if malfunction Release tab shuts off the air, press both tabs to remove from facepiece




    http://www.cram.com/flashcards/msa-f...7-scba-1953829

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    Thanks for the info!
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    Scott AP50's pressure reducer runs between 85 and 110 PSI on the primary circuit (normal operation) and between 145 and 165 PSI on the secondary circuit (low air - vibralert sounding).

    If I remember correctly the face piece regulator supplies less than five inches of water pressure (the positive pressure) against your face.
    I can't believe they actually pay me to do this!!!

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    "The old saying is you never know how heavy that flashlight can become," the friend said.
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