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  1. TJT

    Alarm Philosophy

    Hello, I am looking for a standard or a document that I can refer to when determining where a control loop should alarm. For example; a level with a range of 0 - 100%, what should L1/L2/H1/H2 be set at? What affect does the SP have on this example if it's a control loop? I realize that most...
  2. TJT

    Boiler Water Return Flow Meter

    Hello, We are looking for a flow meter that will be installed on the return line from our boiler to the steam drum. The pressure is ~40 Bar & the water flow rate to the boiler is ~14,500 l/min. Can someone recommend a technology/brand that can handle high temperature/pressure/multi-phase water...
  3. TJT

    Nitrogen Flow Conversion

    Hello, The plant that I'm working in would like me to change the units of our nitrogen flow meter from MT/Day to M3/Hr. The density of the nitrogen is 1.251 g/l. I realize that we are moving from a mass flow measurement to a volumetric flow, but since we were never compensating for the pressure...
  4. TJT

    Measuring Stack Plume

    Hello, I work in the Instrumentation Department for a large Mining & Smelting company. I've been asked to search for a device that would help us monitor the visual aspects of the plume from one of our stacks (approx. 200 feet high). we already have sensors in place for SO2, particulate, etc, so...
  5. TJT

    Load Cell accuracy

    Hello, We are currently using 4 x 200lb rated loadcells, one mounted at each end of 2 weigh bridges for a conveyor belt weightometer. Typically we have about 60 lbs on the weighbridge during normal operation. To calibrate, I hang 110 lbs on the weighbrige and it is usually right on. But the...
  6. TJT

    Liquid SO2 Mass Flow measurement

    Hello, I'm in the process of looking for a mass flow meter to measure liquid SO2 flowing into railcars. Have any of you had good success with any particular models? Thanks.....Tim
  7. TJT

    Measuring Blower Volume

    Hello, We are currently using a venturi for measuring our blower volume into our 2 Roasters. The average volume is 700 NM3/min. The differential of the transmitter is only 5.5" W.C. Periodically we have another group come in and, using a pitot tube, take samples and calculate the volume. We seem...
  8. TJT

    Boiler Temperature Measurement

    Hello, I am looking into options for measuring the temperature of the gas stream at the outlet of the boiler radiant section of our plant. We usually use thermocouples, but my concern is that with the carry over of ash etc. in that area we soon will have a build up of insulating materials...
  9. TJT

    Ceiling Crack

    Hello, I've been struggling for years with a crack in my ceiling that spans about 10 feet, seperating my living room and dining room. This is on the upper floor of a 20 year old house. Twice I have had the drywall repaired only to have the crack reappear within six months. Initially I thought it...
  10. TJT

    Calculating new differential pressure

    I need to increase the range of a couple of flow meters because of re-sized pump impellers. I need to know how to calculate the new DP. Is it just a ratio of the new range vs the old range x the old DP? Since it is not going to be a significant increase in flow range I will use the existing...
  11. TJT

    Slurry Flow Meter

    Hi, I am currently using a doppler style meter to measure the flow of a zinc concentrate/water slurry to an autoclave. The slurry varies between 65% - 75% solids and the average flow is approx. 200 litres/min. We use Toyo style pumps so the flow does pulsate. The pressure is approx.200 psi, and...
  12. TJT

    H2SO4 Concentration

    We currently are using conductivity type instruments to measure the concentration of H2SO4. The typical range is 94% - 99%, with a setpoint of 98.5%. At times, if we exceed 99% we get a false reading because of the nonliner relationship between it's conductivity vs concentration. Does any one...
  13. TJT

    Molten Sulphur Level Measurement

    Our process pressure leaches concentrate to produce a zinc slurry. We extract the sulphur and melt it. In the past we have had success with steam-jacketed bubble pipes to measure the level of the sulphur in the tank. Due to frequent process upsets, the molten sulphur has recently been foaming...
  14. TJT

    Pulsing Flow Measurement

    I am trying to find an instrument that would be able to measure a flow of peroxide through a metering pump. The range is very low( 2 - 8 litres/Hr). I haven't decided if we need to have the signal transmitted or if a local indication would do. I am hoping to find something that would verify that...
  15. TJT

    Measuring molten sulphur flow

    We are looking at measuring the flow of molten sulphur (150 deg. C) through a 6" steam jacketed line. Any ideas for a suitable type of meter Thanks...Tim
  16. TJT

    Steam Flow calculations

    When measuring steam flow from a Steam Drum the question has been raised as to the accuracy of the reading when the temperature / density changes. If the pressure of the steam drum drops, the density changes, so what, if any impact does this have on the orifice plate calculation? ie) for a...

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