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  1. jsummerfield

    Are You An Engineer If You Don't Pass The P.E.?

    I cannot open an internet site for Purdue, Texas Tech or MIT and verify that you are an engineering graduate in good standing. However, many states post a roster of all engineers licensed in that state. http://www.tbpe.state.tx.us/downloads.htm#roster John
  2. jsummerfield

    New to Piping

    It takes time to grasp these codes. It also requires a visit to a warehouse, construction site or plant to visualize a Class 150 and a Class 1500 flange in the same pipe size. The materials and all of the other lingo also takes time. Your employer does not expect a recent graduate to know...
  3. jsummerfield

    Intrinsically Safe Barriers

    I will pull something out of the ISA standards. For now just forget about anything over 100 mA. John
  4. jsummerfield

    Analog signal...mA vs. DC?

    Distance is a factor with 0-5 VDC. Unless the distance is greater than a mile it is not a significant factor for 4-20 mA. John
  5. jsummerfield

    NG pressure relief stack

    2 centavos This looks like an obsolete installation that would not be recommended today. If you are addressing PSV discharge headers or startup vents, most would route to a flare header. John
  6. jsummerfield

    hazardous area classification for diesel oil storage tankfarm

    From API RP 500 “Refer to NFPA 325 for properties of specific flammable liquids, flammable gases, and volatile solids. Flammable and combustible liquids vary in volatility and are defined in NFPA 30.” … … “Combustible (Class II and Class III) liquids, such as kerosene and diesel fuel, are...
  7. jsummerfield

    instrument air package

    Define the volumetric flow capacity in terms of normal and maximum. Define the pressure requirements. Define the required outlet air quality in terms of clenliness, dew point, etc. Advise of nasty compounds in the air such as asphaltines, etc. Define the existing space available for the...
  8. jsummerfield

    Need for a marine radar detector??

    Check the marine catalogs. West Marine / Boat US, others sell these things. We buy cheap VHS radios for small boats, better radios for bigger boats. Bigger boats have radar. Some small boats owners buy radar detectors, especially those who do crossings, etc. John
  9. jsummerfield

    Speed of sound in two-phase mixture?

    Consult the manufacturers of doppler type ultrasonic flow sensors. The doppler meters work best with some bubbles or particles in the stream. However, I suspect that your two-phase steam application is a poor match for their data. John
  10. jsummerfield

    Platform design companies

    GVA consult in the vessel or hull design. You may want to differentiate the topsides or processing area from the platform deck. In this context the platform deck may be supported on a floater or a fixed jacket for shallow water. A subset of these companies have deep water experience. John
  11. jsummerfield

    Bluetooth Transmitters (Pressure, Flow)

    Some of the Wireless Key Words include Spread Spectrum, Frequency Hopping and Wireless Mesh Networking. TIA-683-C Over air mobile spread spectrum covers some of the protocol. I regard the wireless stuff as suitable for monitoring but would need lots of experience before I used wireless for...
  12. jsummerfield

    Large ASME Flagnes

    B16.47 covers larger flanges. There are multiple patterns in larger flanges. You have to assure the same selections on the piping and valves for example to fit. John
  13. jsummerfield

    Bluetooth Transmitters (Pressure, Flow)

    No. My recollection of Bluetooth was as a wireless connection for a room in a house. For the PC market, Wi-Fi took the market for multiple rooms, etc. Phoenix and many organizations offer wireless accessories to send a signal somewhere. John
  14. jsummerfield

    DRAWINGS IN THE WORKPLACE

    http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=NEWS_RELEASES&p_id=10775 John
  15. jsummerfield

    Bluetooth Transmitters (Pressure, Flow)

    Many transmitter manufacturers are going after the wireless market for distances under a kilometer. Honeywell did a presentation at my office a few months ago. Emerson (Fisher-Rosemount) should also be in that market. John
  16. jsummerfield

    electronic valve search

    How large or small is the line? Is this for on/off or throttling? Pneumatic force is normally used within the process industry to move the valve and an electrical signal is used to throttle or switch the pneumatic medium such as an instrument air supply. Solenoid valves can switch the air for...
  17. jsummerfield

    formula for pressure in a pneumatic cylander

    Depending upon the design you may need to consider two areas as the stem side has a smaller area reduced by the stem area at the piston. Use a catalog for the selected actuator to find tables that reflect the forces available at different supply pressures and different stages of travel...
  18. jsummerfield

    Pressure Reducing Valves

    Pressure regulators work well where properly applied. A pressure reducing valve is controlling the downstream pressure. An ideal application has a constant upsteam pressure and flow or demand. Few applications are ideal. As the downstream pressure increases the spring imbalance closes the...
  19. jsummerfield

    Corona Lamps for Ozone production

    Do a web search for ozone generators. A late-friend of mine used to make the corona lamps when his distributor in Israel quit making them. John
  20. jsummerfield

    How to assess venting nitrogen for process preperations

    Concerns exist. A high concentration of nitrogen is toxic in that it depletes oxygen. If you used nitrogen to inert a process line of vessel then the nitrogen would be laced with the hydrocarbon or other components. It is best if the nitrogen can be vented to a flare or "safe location"...

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