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  1. xcrosby

    Adhesive for Chlorine Service

    Many valves use adhesives such as Loctite for thread locking and cylindrical fitted parts. However, Loctite is not recommended for chlorine service do to the explosion potential due to outgasing during curing. Does anyone know of an adhesive that can be used in chlorine service?
  2. xcrosby

    Material strength : SS316 for class 2500 valves

    Are you using the wall thickness per ANSI/ASME B16.34?
  3. xcrosby

    Operating pressure very close to set pressure

    Make sure that your clearly specify the conditions to the pressure relief supplier. Your conidtions are extreme and exceed the recommendations of just about every type of presssure relief valve that I am aware of. I would suggest that you specify that the set pressure be held tighter than...
  4. xcrosby

    What's behind ANSI B16.5 Class Ratings

    I believe that the class designation are based on saturated steam. For example, when these class designations were established, with the flange materials in use at the time, that a class 600 flange was good for 600 psi saturated steam. As materials improved the actual pressure ratings...
  5. xcrosby

    Quench Tank Sizing Methods For Relief Systems

    "Guidelines for Pressure Relief and Effluent Handling Systems" published in 1998
  6. xcrosby

    Fire safe

    Yarmouth Research is in Yarmouth, Maine
  7. xcrosby

    Multiple PSV Sizing at very low pressure setting

    Your set pressue of 0.05 psig does not look right. You will not find a spring loaded valve with such a low set pressure.
  8. xcrosby

    Liquid Service Relief Valves

    Please note that there is no blowdown requirement for liquid service valves in the ASME Code
  9. xcrosby

    Pressure Relief Valve top release

    I believe that Section VIII of the ASME Code requires the horizontally mounted pressure relief valves be designed and tested in the horizonal position. I'm not exactly sure of the wording. I am not aware of any ASME Code certified valves that have been certified in the horizontal position...
  10. xcrosby

    Non standard orifice in PSV

    API only lists orifice sized for standard flanged valves. The best thing to do is to contact the valve manufacturer for technical information. If the valve has an ASME Code stamp then it should be listed in the National Board "Red Book".
  11. xcrosby

    Relief Valve response to Pulsation from Positive Displacement Pump

    In the mid 80's ASME Section VIII added rules for the capacity certification of liquid relief valves. The required overpressure was 10%. To achieve a full lift at 10% overpressure valve manufacturers redesigned their valves. One feature that most of these valves have is a "pop" action similar...
  12. xcrosby

    Relief Valve response to Pulsation from Positive Displacement Pump

    Many liquid pressure relief valves do not lift until the pressure is almost at the 10% overpressure value. At the pressure that the valve is set to open there is a very small amount of flow. The flow does not significantly increase until the high lift pressure is reached, which can be as high...
  13. xcrosby

    Relief Valve response to Pulsation from Positive Displacement Pump

    A valve set at 1250psig may actually be set as high as 1287.5 psig if you consider the 3% tolerance on set pressure. Also the valve may not lift until 1375 psig which is the 10% overpressure. If you provide more info on the type of valve I may be able to help more.
  14. xcrosby

    2nd Generation PTFE vs. Reinforced TFE

    Maybe the manufacturer is refering to Teflon NXT.
  15. xcrosby

    relief valve bonnet vents

    In addition to balanced bellows valves there are also balanced piston valves that have vents which should not be plugged. These two types of valves are shown in the "Crosby Pressure Relief Valve Engineering Handbook." Plugging the vent, combined with a leaky bellows or piston seal...
  16. xcrosby

    relief valve bonnet vents

    Please see: http://www.hse.gov.uk/hid/osd/notices/sn_02_02.htm
  17. xcrosby

    liquid trim

    Liquid trim in pressure relief valves was developed to meet the ASME Section VIII capacity certification requirements at 10% overpressure. Prior to liquid trim, the same valve was used for liquids and gas. Full lift on liquids service was achieved at pressures above 10% overpressure, usually...
  18. xcrosby

    Help w/ Relief Valve Analysis

    I have seen many attempts to analytically model the operation of a pressure relief valve. No one has been successful. There are too many effects that cannot be modelled. Small changes in geometry can make dramatic differences in performance. It can take many years of experience to understand...
  19. xcrosby

    Very Important

    I'm not exactly sure if your problem is with the mud accumulating in the nozzle of the valve before it has relieved or if it is with the mud after the valve has relieved. If the problem is with mud accumulating in the nozzle before a relief event then a rupture disc may be the answer. Another...
  20. xcrosby

    Help w/ Relief Valve Analysis

    Take a look at the Crosby Valve Engineering Handbook. http://www.andersongreenwood.com/docnet/library/enghnbk.pdf

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