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Recent content by valvepuke

  1. valvepuke

    Minimum Flange Thickness and B16.5 Dimensions

    Thanks for the quick reply. The two flanges mate up fine in that the PSV flange is machined with the proper bolt holes, bolt circle, and raised face dimensions. My experience with cast components says that leaving heavier castings unmachined if it is not necessary is common. My client says...
  2. 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...
  3. valvepuke

    Reboiler Condensate Handling Utilizing a Cooler

    Unfortunately this installation is on an oil production ship called an FPSO and our client has not indicated any other use for the steam other than to provide us heat for our reboiler. I agree that in most cases flash steam can be utilized for other heating uses. They have really restricted...
  4. 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...
  5. 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...
  6. valvepuke

    316 SST vs 316L SST; Corrosion Resistance

    Thank everyone for your replies so far. I see now that 316L is more corrosion resistant than plain 316. The fluids we handle the most are lean amines (45%amine, 55% water), rich amines, containing H2S and CO2. I would assume that our clients are considering 316L to be better for this...
  7. 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...
  8. 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...
  9. 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...
  10. 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.
  11. valvepuke

    Restriction Orifice Noise

    Thanks, Stanier. I am currently taking a similar approach to what you suggested. The IEC 60534-8-3 gives an equation for the noise produced by an outlet expander fitted to the outlet of a valve. This equation includes the effects of the flow from the smaller inside diameter of the expander up...
  12. 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...
  13. 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?
  14. valvepuke

    Control Valve Noise: Installed vs Theoretical

    I appreciate the replies. I would like some additional insight on this issue. I understand that the valve is the noise producer and the downstream piping is the component that radiates the sound energy into the nearby environment. The IEC equations are based upon a particular sensing point...
  15. 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...
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