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  1. geo57

    How to choose the best type of valve

    You did not mention what kind of flow rate, or available presure drop you need for the valve. These are some of the main criteria for selecting the valve type. In most pressure control applications a globe valve with equal percentage trim is the best choice, unless a low pressure drop is...
  2. geo57

    Starting a gass burner using an ignitor?

    In industrial applications this is usally done using flame scanners which detect UV, IR, or both. Your home hot water heater (if it's gas) uses a thermocouple assembly. This would most likely be your best bet, if you are designing some type of electronic system. It would fairly easy to add the...
  3. geo57

    Valve installation on the online pipe

    Hi, You could use the same "Hot Tap" procedures you would use on any process line. You basically weld a connection to the pipe, and then use a machine to bore through a valve into the pipe. You did no mention the line sizes, but if they are small, you could forego the hot tap machine...
  4. geo57

    Cavitation in a Valve

    Hi, I would recommend contacting your local Fisher Valve rep. Fisher has extensive data on cavitation, and can most likely answer any questions you would have about it. George Griggs Sr Process Controls Engineer
  5. geo57

    Class II division 1 ( but according IEC Code)

    Hi, Since you have not gotten any other replys, I'll share my expieriences with you. You did not mention which country in Europe you are working in. The reason is that Germany has different procedures than most of the rest of Europe in the area of grounding. Most other countries use a...
  6. geo57

    Field Splicing Fiber Cable

    Hi, I am looking for some instructions on the procedure used to terminate fiber optic cables. I am planning a field trip to a remote site, and will need to terminate a few ST type connectors. I am in the process of ordering a compression type termination kit, but I don't know how to use it once...
  7. geo57

    AREA CLASSIFICATION FOR LNG GENERATION

    Hi, You may want to take a look at API RP 500. It states it is not necessary to classify the following "1. Adequately ventilated areas where flammable substances are contained in well maintained, closed piping systems which include only the pipe, valves, fittings, flanges, and...
  8. geo57

    necessity of continious running of pilots

    There are various codes and standards on this issue. The one most widely quoted is NFPA 85C. It basically states that if the igniter (pilot) supplies less than 4% of the heater duty then is turned off after the lighting of the main burner. There is basically two schools of thought on this. The...
  9. geo57

    PLC w/ a high operating temperature

    You may want to look into a vortex cooler which can be mounted on the outside of the PLC enclosure. They are inexpensive, and operate on an air supply. They do however use quite a bit of air. George Griggs Sr Process Controls Engineer
  10. geo57

    gaps in socket weld fittings

    Hi guys, The way I have seen this done in the field by actual welders is to set this gap by simply pulling the pipe, or fitting all the way to one side, tack welding it on the opposite side , then squaring it up. This always gives you the same gap per line or fitting size. Usually a little less...
  11. geo57

    conduit practices in class 1, div 2 areas

    Mike, I've seen instrument connections with and without seals. You are not required to install the seals on analog devices, although several companies private standards require them. The sealtite is limited to the six feet, and I use connectors with the external bonding jumpers, they make a...

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