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  • Users: Weegie
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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

    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.
  6. 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.
  7. 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.
  8. 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...
  9. Weegie

    Instrumentation Loop Checking Standards/Procedures

    Hi. I'm checking a technical spec outlining the work scope for potential construction contractors. The contractor will be responsible for all documentation related to and technical completion of loop checking. (Previous site experience has taught me that most contractors have to have their hands...
  10. Weegie

    I/O count for Delta V DCS

    Hi. I'm doing an I/O count for field devices to a Delta V DCS. All electric motor data is being picked up via Devicenet. The Devicenet will be communicating with the Delta V. What I'm not sure on is, should I count the Devicenet I/O for the motors and add it to my field device I/O count for the...
  11. Weegie

    Electronic Transmitter Ranging

    Are there any 'Rules of Thumb' in regards to the calibration ranges of electronic transmitters ? I have a process with norm/max values of 100/150psig. I've asked for a calibration range of 0-200psig (4-20mA) with a normal value at around 12ma and a max value at 16mA. I also have a range on a...
  12. Weegie

    Bolting for DIN Flanges

    Hi, I'm looking for help/clarification on the use of machine bolts and/or studbolts on DIN flanges. I have a table (catalog cut) that shows stud bolts or machine bolts can be used on PN 20 (CL150)& PN 50 (CL 300) flanges. The same table shows stud bolts only for PN100/150/250/420. I also found...
  13. Weegie

    Restriction/Flow Orifice Plate Dimensions

    Hi, I'm looking for info/spec numbers for the manufacture of Restriction/Flow Orifice Plates. I've found lots of useful websites with sizes/dimensions for imperial sizes(typically 2" pipe ANSI 150 & upwards) I'm looking for the metric equivalent in DIN/PN pipe size/class. Thanks.
  14. Weegie

    Critical Flow Restriction Orifice Plates

    I'm looking for advice, guidance or opinons on critical flow RO plate thickness's. Our vendor uses FLowel software to calculate RO plate bores & thickness's and came up with a couple of plate thickness's of 0.75" thk/0.663" bore for a 2" line and 1.75" thk/1.69" bore for a 4" line. I thought the...
  15. Weegie

    Hastelloy C276 Flange Press v Temp Rating

    I'm looking for a chart or graph of the press v temp rating for (CL 600) Hastelloy C276 flange. I have an ANSI B16.5 graph for Material groups 1.1 through to 2.3 (Carbon St, Alloys etc) but, nothing for Hastelloy C276. Does Hastelloy C276 fall into any of the typical material groups ? Thanks.
  16. Weegie

    Instrument Impulse Line Air Purge

    Looking for some guidance please on settings/calcs for air purging instrument impulse lines. Situation is as follows. Atmospheric Furnace (refinery) Operating temp & pressure 1750 Deg F & 3.5psig Max temp and pressure 2100 Deg F & 6 psig. Refinery std is for a Fisher air regulator feeding air...
  17. Weegie

    Restriction Orifice Standards/Specifications

    I'm looking for standards/specification numbers that cover the calculations for, and manufacturing of, 'restriction orifices'(and not 'flow orifice plates'). Are they covered by the same standards/specifications for flow orifice plates e.g., ISO 5167, AGA Report No.3, API 14.3.2 or something...
  18. Weegie

    Restriction Orifice Specifications

    I'm looking for standards/specification numbers that cover the calculations for, and manufacturing of, 'restriction orifices'(and not 'flow orifice plates'). Are they covered by the same standards/specifications for flow orifice plates e.g., ISO 5167, AGA Report No.3, API 14.3.2 or something...
  19. Weegie

    Venturi Tube Specifying

    Gents, I'm specifying DP transmitters for flow measurement. The transmitters will be used with orifice plates, venturi tubes and annubars. My question is this, my 'Rule of Thumb' delta P range/calibration for the orifice transmitters will be 0-100"WC. As Venturi's are pre-fabricated, is there a...
  20. Weegie

    Instrument Impulse Lines

    Gents, Several years back I had information regarding temperature drop in impulse lines i.e x Deg per foot or whatever, between root valve to electronic instrument. Anybody have a link or reference to similar info ? Many thanks.

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