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  1. aggieengineerrmb

    Oxygen Service Dangers

    Does anyone know of a reason that it would be unwise to use carbon steel for ball valve bodies when used in an oxygen service environment? The valves, of course, would be cleaned and degreased, and we are talking about industrial O2 services, not breathable O2. We have an old (20+ year) note...
  2. aggieengineerrmb

    Psuedo Cryogenic Valve

    We are considering modifying one of our standard, API 6D flanged floating ball valves for use in a cryogenic application with the potential for temperatures as low as -150F. It's a shutdown valve going in front of a relief valve. Normal operating temperature is literally ambient, however in...
  3. aggieengineerrmb

    Psuedo Cryogenic Floating Ball Valve

    We are considering modifying one of our standard, API 6D flanged floating ball valves for use in a cryogenic application with the potential for temperatures as low as -150F. It's a shutdown valve going in front of a relief valve. Normal operating temperature is literally ambient, however in...
  4. aggieengineerrmb

    Thread Engagement for 105 KSI HHCS in 40 KSI Body

    What are some well accepted standards for industrial and oilfield equipment (pressure containing vessels) for thread engagement of HHCS's. In this particular case, I have a 1/2-13 Grade B7 (105 KSI yield) HHCS threaded into a cast steel (WCB with 40 KSI yield) part. How far should the thread...
  5. aggieengineerrmb

    Low Temperature Trunnion Ball Valve

    I have a very low temperature application, -70F, which may not be truly cryogenic, but appears below the level that most valve companies are experienced. It will almost never see those temperatures, the vast majority of the time it will be above freezing. We have had some companies come back...
  6. aggieengineerrmb

    Subsea Floating Ball Valve

    Does anyone know of a supplier who offers small bore (1-4") floating ball valves suitable for subsea service to depths as deep as 5000 ft? I've had been pointed in the direction of Cooper-Camereron, but all they had were typically larger bore, trunnion style ball valves that were extremely...
  7. aggieengineerrmb

    Peroxide Service

    I have heard that it is difficult to find ball valves that work well in concentrated peroxide applications. I can see that it would be difficult to find standard elatomers that are compatible, but what are some of the other issues that users have found that I should be aware of when making a...
  8. aggieengineerrmb

    Grease Suitable for Natural Gas Service

    Does anyone have some ideas about what grease should be used on ball (floating or trunnion) valves when exposed to natural gas? I understand many tradition greases will react and harden over time, which increases valve torque and likelihood of seat leakage.
  9. aggieengineerrmb

    Vacuum Serivce Test Procedure

    Does anyone know of a good procedure to follow if you were going to "rate" a valve as suitable for vacuum service? I'd like to send some to an independent lab for testing, but need a good procedure to follow. I can easily pull a vacuum against a closed ball and see just how low it will go, but...
  10. aggieengineerrmb

    Trunnion Ball Valves in Vacuum Service

    Can a standard, soft seated trunnion ball valve be used in a vacuum service? I hear that these types of valves often have trouble sealing bubble tight at relatively low pressures, say 80 PSI, and if true it seems like vacuum service would only compound the problem. The other side of this would...
  11. aggieengineerrmb

    PEEK Seated Ball Valve Sealing

    Does anyone know what the expectations are in the industry for sealing quarter-turn, trunnion mounted ball valves when using PEEK as the materail for the seat? All the valves I am concerned with are API-6D complaint, and I know that this standard requires zero leakage between the ball and seat...
  12. aggieengineerrmb

    Top Entry Trunnion Valve for 615F Hot Oil Service

    Does anyone know of a MFG or design for top entry trunnion valves that would be suitable for maximum operating temperatures of 615F in hot oil service? Metal-metal seats seem to be pretty much a given at these temperatures, but what I don't see is how the other joints, such as the body-bonnet...
  13. aggieengineerrmb

    Modified PTFE Seat Suitability for CL150/300 Valves

    Does anyone have any experience using valves with modified PTFE seats in typical oilfield services that may have some abrasives like sand present? The molecularly enhanced PTFE is simply PTFE that has a small amount (less that 1%)perfluoropropylvinylether (PPVE) added, which has no affect on...
  14. aggieengineerrmb

    GA Drawings

    What is the difference between a General Arrangement drawing and a General Assembly drawing for a component like a valve or a pump? I guess I have always used these terms interchangeably and called them both GA drawings, but I see that some vendors differentiate them.
  15. aggieengineerrmb

    High Temperature Valve Grease

    Does anyone know of a grease that is suitable for use on metal seated ball vavles that carry a temperature rating of up to 800F. I have already consulted many of the typical suppliers of industrial lubricants and really found no one that offers products that are suitable for continuous use at...
  16. aggieengineerrmb

    Class IV Leakage

    I am looking at a 1" metal seated ball valve with a Cv of 40. What is the maximum allowable leakage rate at 100 PSI for Class IV service?
  17. aggieengineerrmb

    Special Handling Procecures on Inconel 625 Components

    Does anyone know of a reasonable and prudent approach that is typically used for handling of Inconel 625 components that have been pickled and passivated. The idea behind a special parts handling procedure is to avoid any possible contamination by ferritic materials after the parts have been...
  18. aggieengineerrmb

    Help with standards that govern welding valves to gas pipelines

    Does anyone know what industry standards are commonly used to govern the design and procedures used to determine the wall thickness of butt weld adapters used on ball valves for the gas pipeline market? Also, does anyone know what standards govern when it is necessary to use a transition piece...
  19. aggieengineerrmb

    Source of Torque on Butterfly Valves

    Does anyone know what design factors most affect the operating torque of a butterfly valve. I am talking about same size and configuration of valves here. There was some thought in our group that the stem bushings were the significant component, however tests using alternative friction...
  20. aggieengineerrmb

    Pipleline valve wall thickness design standards

    Which industry standard code or codes are most commonly referenced for conformance in the construction of natural gas pipelines? Specifically, wall thickness (at the butt-weld end) of components such as valves must be determined considering design pressure, materials (allowable stresses) and...

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