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  • Users: valvepuke
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  1. valvepuke

    Minimum Flange Thickness and B16.5 Dimensions

    I have a flange joint made up of a 4" Class 150 pipe flange connected to a pressure safety valve (PSV) inlet. The PSV comes standard with an as-cast Class 300 flange on its inlet. The manufacturer machines the inlet flange just enough to conform to the fit up requirements of the Class 150...
  2. valvepuke

    Reboiler Condensate Handling Utilizing a Cooler

    I have been reading many threads on the subject of handling condensate from a reboiler. We are in discussions with our client and can't seem to come to any agreement. The problem is that my client's condensate return header operates at 90 degC and 1 bara. The condensate from our reboiler is...
  3. valvepuke

    Weld Spacing; ASME Pressure Vessel

    My colleague and I are questioning the distance of a nozzel weld from a circumferential weld on a pressure vessel that meets ASME Section VIII requirements. I am sure that the welds cannot be too close together. We do not have a copy of Section VIII to check this vessel against. Can anyone...
  4. valvepuke

    316 SST vs 316L SST; Corrosion Resistance

    We are seeing specifications requiring 316L SST for machined parts in valves, etc., to be used in some corrosive services. We have, in the past, generally utilized only 316SST. There is no welding required for such parts. My questions addresses the difference in corrosion resistance between...
  5. valvepuke

    Ball Valves to Meet ISO15848

    We have a need to procure manual ball valves, 2" through 10", Class 150, that meet the fugitive emissions requirements of ISO 15848-2, category B. The valves can be tested to either the ISO 15848-1 for type certification or production certified per ISO 15848-2. Does anyone out there know of...
  6. valvepuke

    20 KV AC Cable Supplier

    Our company currently utilizes a bare copper conductor running in an oil-filled pipe to route 20 kV AC voltage (1.0 amp) from a step up transformer to an electrostatic grid used for oil/water separation. We want to change this design to use an insulated conductor running in either conduit or a...
  7. valvepuke

    Shell MESC SPE77-300 and ISO 15848-2

    Is there a correlation between Shell's fugitive emission specification SPE77-300 and the ISO 15848-2? We are being asked to provide valves that meet the Table 1, Class B, and Table 2 emissions on a project. Several vendors are qualified to the above mentioned Shell standard.
  8. valvepuke

    Restriction Orifice Noise

    I am looking for a method for calculating AERODYNAMIC noise generated in a pipe due to a restriction orifice. I am familiar with the IEC method for aerodynamic noise prediction in control valves and think some of the same principles might apply to an orifice. If one uses the same approach...
  9. valvepuke

    ASTM Designations; A516 vs SA516

    What is the difference between A516 plate and SA516 plate? Also, I see it designated SA516N. What does the N mean?
  10. valvepuke

    Control Valve Noise: Installed vs Theoretical

    I have had many discussions concerning the prediction of valve noise using the current IEC 534-8-3 standard. My discussions usually involve how the actual configuration of the valve installation affects the theoretical Sound Pressure Level(SPL)produced by the equations in the IEC standard. The...
  11. valvepuke

    Chloride Stress Corrosion - Pressure Safety Valves

    I have a philosophical discussion going concerning acceptable materials for pressure safety valves used in seawater. Our specifications require ALL Monel materials for the valves. These safety valves are low pressure units (ANSI Class 150, relief pressure 180 psig, 90 degF). The reason the...
  12. valvepuke

    Intrinsic Safe Wiring to Instrument

    I have a Westlock Quantum 3600 Series position switch box with pneumatic solenoid fitted to it. It is mounted to a ball valve actuator. This assembly is certified to ATEX EEx"i", instrinsically safe. Problem is that the box has only one cable entry hub. We have two cables routed to this...
  13. valvepuke

    Turbine Gland Seal Steam Control Valves

    I would appreciate a quick tutorial on the functions of the control valves utilized for turbine gland seal steam control. These three valves are generally designated as: Boiler supply valve; cold reheat supply valve, and the spillover valve. I am particularly interested in the operation...

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