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  1. pittguy727

    best option for a ball valve seats

    Nylon is usually used for Toluene, Benzene, etc... and Teflon can be used for almost anything except these. It will rub away if the valve body is SS, so I would recommend using PP bodies on them. Can you tell us alittle more specifics about this application and what you are looking to use the...
  2. pittguy727

    accuracy of stop watch

    Thanks... I am printing up these replies to maybe help coax people here to loosen some purse strings. I just started here and was amazed! at the low consistency in the process here. Thanks again!
  3. pittguy727

    LNG Properties

    LNG- Wewll, as you know it's about 90-100% Methane, so it's density is 26.5 LBs/Ft3... and weight about 3.5 lbs/gallon. the Boiling temp is -259F and molecular weight is 16.04 Energy content is about 83,000BTU/gal and LFL=5% and HFL=15%. The Viscosity can vary, but burning(flame) velocity...
  4. pittguy727

    Glass etching, can anyone help

    ...me figure out etching rates for 40% leaded glass being etched by 5%HF/2.5% HNO3 at room conditions? And how would I calculate the change in amount of glass (thickness) is being etched off at varying Acid concentrations? Safety wants to decrease HF %, but I fear we will not get sufficient...
  5. pittguy727

    commercial name

    There are alot of trade names for PET... one company we bought off of before is eastman. www.eastman.com I think they are merging or becoming veridian?? But you can contact them for information on PET's
  6. pittguy727

    Help me choose steel....please...

    If you want just a replacement metal, you can try Hastelloy or inconel products, they are normally used for corosion, but have great heat properties too.
  7. pittguy727

    accuracy of stop watch

    I have an odd question that is bugging me and I really need some help. We are timing a particular process that is very important by using a stopwatch and visually watching this equipment move from one point to another in only 2-2.3 seconds. I want to change this to something more high-tec, but...
  8. pittguy727

    RADIATION DRYING

    It may be possible, but if it is a long line, you will probably get what is called pneumatic conveyance which will cause the line to plug up in layers, then you will have hard shale like deposits in the line you would have to periodically clean out. I think this happens because the humidity in...
  9. pittguy727

    Delrin and static charge buildup

    heather, Depends what you mean by significant... but yes, you can accumulate a charge with Delrin which can attract dust and fibers which then may cause defects depending on your process. I would suggest buyiong ionizers to put on your air blows, worked for me and my processes.
  10. pittguy727

    Cleaning water lines

    Hi all, new member. I need to clean water lines (because of bacteria and gelling)in my process (1" PVC), which is not the best to use for water, but I didn't design it. Anyways, the current method here is to use Sodium HypoChloride and surfactant. I feel this method is good, but also...

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