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  1. ncstate86a

    high temperature pipe-in-a-pipe systems

    Thank you again, LittleInch! My application is identical to the other one...air at 1350F @650 psig and velocities between 150 to 250 ft/s. the system thermal cycles 3-5 days a week (on 12 hours/off 12 hours). Conceptually I would think the pitfalls associated with expansion joints installed in...
  2. ncstate86a

    high temperature pipe-in-a-pipe systems

    Thanks LittleInch - I appreciate your comments. A system like this exists in Germany but I am having a hard time time finding any information concerning the manufacturer or details concerning the design. 1350 deg F at 650 psig is an the actual operating condition.
  3. ncstate86a

    high temperature pipe-in-a-pipe systems

    I am not experienced in using refractory line pipe. I would assume it is very difficult to make modifications after installation. we have always shied away from it due to concerns with particulate in the stream and the potential for plugging small orifices in equipment downstream. Do you...
  4. ncstate86a

    high temperature pipe-in-a-pipe systems

    I am looking people (someone, anyone) who have experience with high temperature pipe-in-a-pipe systems. I was told of a facility that uses a such a system for hot air at 1350+ F and 650 psig. The inside pipe (12") is vented to the outside pipe (~20") such that it is not pressure retaining; it...
  5. ncstate86a

    Anyone have experience PDP Buttferfly valves?

    I have been looking at a PDP (Parallel Disc Press) butterfly that is being offered in the USA by a company called "Critical & Severe Service Products, LLC (www.critical-severe.com). I believe they are actually manufactured in Korea and distributed by Critical & Severe Service Products in the...
  6. ncstate86a

    multi-hole flow orfice meters

    Balanced flow meters are slightly different than what you describe knapee. They were developed by NASA due to the fact they needed very precise flow measurements with little or no upstream and downstream straight lengths. A+flowtek is a NASA spin off company. They market these plates as drop in...
  7. ncstate86a

    multi-hole flow orfice meters

    Yes, it is similar...A+flowtek mentioned something about patent infringement...who knows. the A+flowtek meters typically have one center hole and six or more holes on a circumference sharing the same center point as the center hole. Emerson does not claim the same accuracies. I would love to...
  8. ncstate86a

    Multi-holed metering orifices (ie, balanced flow meters)

    I should have stated that we are a reasearch and development laboratory where flow measurement is key to our data. We have have tried them....I am trying to obtain other people's personal experience with this equipment without biasing their comments based on what we are seeing. Any information...
  9. ncstate86a

    multi-hole flow orfice meters

    Has anyone tried A+ flowtek's balanced flow meters (http://www.aplusflowtek.com)? I am trying to find people with first hand operational experience to support or dispute their claims of flow metering accuracy to +/- 0.5%. They are a NASA spin-off company. I also know that Texas A&M did some...
  10. ncstate86a

    Multi-holed metering orifices (ie, balanced flow meters)

    Has anyone tried A+ flowtek's balanced flow meters (http://www.aplusflowtek.com)? I am trying to find people with first hand operational experience to support or dispute their claims of flow metering accuracy to +/- 0.5%. They are a NASA spin-off company. I also know that Texas A&M did some...
  11. ncstate86a

    Maximum allowable working pressure rating of pipe fittings

    4Pipes, I appreciate your input and is the exact phrase you noted from B16.9 that has ne stumped. When you have two 16" NPS 0.500" wall pipes whose maximum allowable pressures differ by 50 psig simply due to the manufacturing tolerances called out in the material specification (SA312 vs SA358)...
  12. ncstate86a

    Maximum allowable working pressure rating of pipe fittings

    Stonecold, I agree but the ASME Codes already have safety margins built into the allowable stress values for Code approved materials. Also, at this temp, pressure and diameter, I am presented with few choices other than innconnel, hastelloy and other exotic alloys that are economically...
  13. ncstate86a

    Pressure/temperature ratings of fittings

    We are currently investigating the installing a 16" nps 0.500" wall pipe to carry 1200F air at 450 psig. Due to the manufacturing dimensional tolerances of SA312 Type 316, the maximum allowable working pressure calculated per B31.1 is below the design pressure of 450 psig. Instead we have...
  14. ncstate86a

    Maximum allowable working pressure rating of pipe fittings

    I would appreciate any help you guys can give me on this issue. We are currently investigating the installing a 16" nps 0.500" wall pipe to carry 1200F air at 450 psig. Due to the manufacturing dimensional tolerances of SA312 Type 316, the maximum allowable working pressure calculated per B31.1...
  15. ncstate86a

    Upgrading to latest B&PV Code

    I am not sure what the law is in Canada. In the US, I believe the edition and the addenda of the ASME Code to be used in EACH INDIVIDUAL PLANT is called out in the FSAR and in Tech Spec's of the plant. No two plants will necessarily use the same edition and addenda; typically it will depend on...
  16. ncstate86a

    Multiple instrument penetrations in a blind flange

    I appreciate your input (both of you). When I originally tried to apply UG-34 to the blind RF 6" 300# flange that was designed via B16.5, the flange thickness (without evaluating the penetration) as calculated by UG-34(c)(2)equation 2 is greater than the B16.5 thickness of 1.44" min.. Components...
  17. ncstate86a

    Multiple instrument penetrations in a blind flange

    I am currently reviewing a Section VIII pressure vessel design and am stumped as how to verifiy the possible need for reinforcement in a 6" 300# blind flange that is drilled through the center with multiple penetrations. The blind flange has twenty 7/16" diameter penetrations that are spaced...
  18. ncstate86a

    steam traps

    The best method of detection depends on the type of trap and the pressure/temperature of the steam system. The best way to detect operation is definitely through physical testing. Physical testing normally requires a Tee with a hand valve be installed between a steam trap and an isolation valve...
  19. ncstate86a

    Initial Spring Setting - Control Valve

    Not meaning to beat a issue to death, but the bench set is the air pressure required to move the valve through its full stroke (ie, "open to close" or "closed to open", depending on whether the actuator is a reverse or direct acting actuator. The "bench set" values are based on the fluid system...
  20. ncstate86a

    Venturi style steam trap

    The reason I was not interested in orifices (sharp edge) is that orifices tend not to choke as compared to a venturi nozzle. Secondly, orifices tend to creates eddy currents on the downstream side of the orifice plate as the condesate exits the orifice and flashes back to steam. The result is a...

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