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  1. Weegie

    PLC to DCS communicating.

    Hi. Please excuse my ignorance here. My forty years experience lies with field instrumentation wired back to plc's or DCS systems. I have no idea however, how a plc can talk with a dcs and vice versa. Can anyone please help me with a nut-bolt explanation of what's used (hardware & software) or...
  2. Weegie

    Control Valve Sizing Parameters.

    Our control valve data sheets show (limited) process data as follows:- Temperature - norm/max Inlet press - norm/max Min. flow @ DP Norm. Flow @ DP Max. Flow @ DP My question is, what pressure & temperature numbers should be used to calculate the valve cv ? For min flow cv, I would use normal...
  3. Weegie

    Double Block on a process line designated as B31.1 standard.

    I'm working on a sulph acid plant project (instrumentation group)and on one of the P & I.D's, a section of process line is called out as B31.1. This line is hp steam. The other ends of the process line is tagged as B31.3. (Typical of all our P & ID's) On this B31.1 line, I've noticed that drain...
  4. Weegie

    Instrumentation isolation on B31.1 specified process lines.

    I'm working on a sulph acid plant project (instruemntation group)and on one of the P & I.D's, a section of process line is called out as B31.1. This line is hp steam. The other ends of the process line is tagged as B31.3. On this B31.1 line, I've noticed that drain valves are double block and...
  5. Weegie

    Drum level measurement with DP trx

    Apologies there. I did mean an ethylene glycol mix. There also used to be a commercial barrier fluid for purchase for these type of applications too but, I can't remember the brand name. I've never seen capillaries being heat traced. Your choice of capillary fill fuid would be chosen to suit...
  6. Weegie

    Drum level measurement with DP trx

    Many refinery instrument maintenance crews in cold climates use ethylene glycol as a freeze protection/barrier fluid in impulse lines for frost protection & keeping the process fluid out of the transmitter/manifold assembly. As you most likely have a 'high' & 'low' pressure filled impulse...
  7. Weegie

    Annubar / Pitot Tube DP Calculator

    The annubars are 'averaging Pitot Tubes' (APT).
  8. Weegie

    Annubar / Pitot Tube DP Calculator

    Jake, much obliged for the guidance and info. Having spoken with a couple of our vendors, they then made me aware of their website calculators for the annubars. Best regards, Danny
  9. Weegie

    Restriction Orifice Plate Thickness Calculator

    Ione, much obliged for the formula. best regards, danny
  10. Weegie

    Annubar / Pitot Tube DP Calculator

    Just an update. One of our vendors (Endress & Hauser) directed me to an online interactive annubar calculator on their website. Unfortunately, there's no direct link so, you have to drill down a little to find it.
  11. Weegie

    Restriction Orifice Plate Thickness Calculator

    thanks Ione but, not what I'm looking for. I have similar calculators but, I'm looking for a program that will calculate the thickness of the RO plate based a known pressure drop. If you need a good free down loadable FE/RO calculator get the DG2floCalLite. It's a great program ...
  12. Weegie

    Restriction Orifice Plate Thickness Calculator

    Would anybody happen to have an (Excel based) RO plate thickness calculator ? (My work's computer was recently upgraded and I've lost the one that I had.) Thanks.
  13. Weegie

    Annubar / Pitot Tube Calculator

    Cheers Dave.
  14. Weegie

    Annubar / Pitot Tube DP Calculator

    Much obliged Dave. Best regards. Danny
  15. Weegie

    ESD level switch tapping point (with respect to bottom of vessel)

    I'd take a look at the vessel vendor drawings. your mechanical engineer/department will have specified a centreline elevation of the flange/tap connection for the switch/device. If the vessel is already in service, check with the plant operators and ask what the ESD level is set on the plant...
  16. Weegie

    Annubar / Pitot Tube DP Calculator

    Can anybody point me in the right direction please of an annubar DP calculator in computer software/excel format. I'm looking to check vendor's DP calculations(inches WC)against our given process flow data. Many thanks.
  17. Weegie

    Annubar / Pitot Tube Calculator

    Can anybody point me in the right direction please of an annubar calculator in computer software/excel format. I'm looking to check vendor's DP calculations(inches WC)against our given process flow data. Many thanks.
  18. Weegie

    B16.5 Flanges

    Big Inch, thanks for the reply. The vendor's quote came back with 'CL 150 flanges per B16.5' but there was no mention of RF so, I knew clarification was needed from him. It was the fact however, that he quoted B16.5 that got me thinking that this spec could be for raised face flanges only...
  19. Weegie

    B16.5 Flanges

    My reason for posting here was to try and find out a little bit about B16.5 standards and hopefully receive some feedback that would help educate me a little and clarify my confusion. I did receive good advice telling me that my assumption was incorrect and there was reasoning attached with the...
  20. Weegie

    B16.5 Flanges

    I'm in instrumentation and have a question with regard to flanges to B16.5 standards. If a vendor is supplying an inline magnetic flowmeter with CL 150 flanges to B16.5, can I assume that the flanges supplied are raised face (and not flat faced) ? The instrument data sheets sent to him asks for...

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