Results 1 to 5 of 5
  1. #1
    Join Date
    Jan 2003
    Location
    Venezuela
    Posts
    58
    Rep Power
    22

    Question Pressure-relief valve



    ANSI / ASHRAE standard 15 (2001) defines a pressure vessel as "any refrigerant-containing receptacle in a refrigeration system" but continues by excluding, for example, evaporator coils and condenser coils from clasification as pressure vessels.

    Also, any pressure vessel that contains liquid refrigerant that may be isolated by stop valves located anywhere in the system must be fitted with appropriately sixed overpressure protection?

    So, must an evaporative condenser have a pressure relief valve, and must an evaporator (hot gas defrost - not electrical) have a pressure relief valve?

    Saludos,

    Jan



  2. #2
    Join Date
    Sep 2003
    Location
    ISRAEL
    Age
    72
    Posts
    4,266
    Rep Power
    46

    Re: Pressure-relief valve

    Hi Jan

    It looks like the answer is in the question "that may be isolated by stop valves located anywhere in the system must be fitted with appropriately sixed overpressure protection"


    If you have stop valves that isolate the evaporator or condenser then the answer will be yes according to ASHRAE .

    Chemi

  3. #3
    Join Date
    Jan 2003
    Location
    Venezuela
    Posts
    58
    Rep Power
    22

    Re: Pressure-relief valve

    Hi Chemi!

    Indeed, when you can trap liquid in a refrigeration system or if the pressure can rise above the design pressure (heating coil etc) you must have a relief device (according to standard 15).

    Anyway, if a condenser (coil) is not classified as a pressure vessel, which always need a relief valve, then maybe it does not need any relief valve, as you not likely will fill it with liquid.

    Saludos,

    Jan

  4. #4
    Join Date
    Feb 2002
    Location
    Brazil
    Age
    57
    Posts
    26
    Rep Power
    0

    Re: Pressure-relief valve

    Hi Jan,

    In a evaporator with hot gas defrost we usually have a pressure regulator valve to keep the pressure inside the coil during the defrost, so in my opinion, this valve works like a pressure relief valve.

    Best regards.

    Volnei

  5. #5
    Join Date
    Jan 2003
    Location
    Venezuela
    Posts
    58
    Rep Power
    22

    Re: Pressure-relief valve

    Hi Volnei,

    Hot gas defrost could also be working with a HP float valve.

    Anyway, if the hot gas pressure regulating valve should count as a pressure relief valve, then you can not have stop valves before or after.

    Best regards,

    Jan

Similar Threads

  1. Building a wine cabinet
    By Rory in forum Technical Discussions
    Replies: 38
    Last Post: 13-07-2004, 08:28 PM
  2. Relief Valve on Suction
    By Latte in forum Commercial
    Replies: 19
    Last Post: 21-01-2004, 12:57 AM
  3. over-under pressure relief valve
    By philip de moor in forum Industrial
    Replies: 3
    Last Post: 08-01-2004, 01:50 PM
  4. Pressure relief valve
    By DaBit in forum Fundamentals
    Replies: 18
    Last Post: 16-08-2003, 03:11 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •