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  1. Instrument1352

    Alloy 625 & 316SS, Dissimilar Metal Compatibility

    Hi, We have an instrument where one piece is Inconel alloy 625 in touch with the body of 316SS. It is in fact a rupture disk (thin plate) of Alloy 625) with a 316SS holder at both sides. I do not think there would be a dissimilar metal corrosion issue here however appreciate if you could...
  2. Instrument1352

    Combined MV/LV Switchgear Room

    Hi, We are considering use of an existing 60+ years plant. The main substation has both MV and LV gear in the same room, opposite each other. All the oil and air breakers, protection relay, etc. are still the original 1960's. There is an opportunity to upgrade if necessary. Is it a requirement...
  3. Instrument1352

    DP Flow Meter & potential use of Density Meter to calculate the correct flow instead of MW estim

    Hello, Other than P&T compensation for dry gases, are "density meters" being used to make mass flow measurement by DP flow elements? (say an insertion type).This would be meaningful especially for large bore pipes where Coriolis. A thermal mass flow measurement is also heavily dependent on...
  4. Instrument1352

    LV Cable Selection - Voltage Rating - Single Phase, 700V rms

    Hi, I have an application where the supply is a "float" 700V rms, 50hz and the load is 50m away about 5kw, all at ambient temperature. Normal power cables are rated 0.6/1kv which seem to be ok (0.6kv core-earth and 1kv core-core), however my concern is if a fault occurs and one of the cores is...
  5. Instrument1352

    Lithium Iron Phosphate (LiFePO4) vs Lead Acid Batteries - Industrial Application & Consideration

    Hi, we are replacing an old 30KVAh UPS system for an offshore oil installation. We have been given options of: - Lithium Iron Phosphate (LiFePO4) Batteries; as well as - Valve Regulated Lead Acid Batteries - maintenance free (the same as existing ones) I am aware of the advantages of the...
  6. Instrument1352

    Split Range DP Orifice Flow Meter - What Ranges

    Hi, Here is the application as follows: Existing orifice plate, 500mbar DP @ full scale gas flow of 900scfm (I know it is high DP!). I am going to use two DP transmitters in a split range arrangement. Which of these would you suggest? 1- Transmitter A: 0-50mbar (284scfm) Transmitter B...
  7. Instrument1352

    Flare Flow Measurement- Past Experience with SICK FLOWSIC100 Flare -Insertion Ultrasonic Flowmeter?

    Hello, We have a flare gas measurement application on a 12" line for a gas plant. The composition of the gas in not constant so we have phased out thermal mass as well as DP ones. We have decided to use ultrasonic. SICK has a model which is an insertion type from one side only, model...
  8. Instrument1352

    Dissimilar Metals Galvanic Corrosion: SS Tubing Connected to CS Pipe - Is it a concern?

    Hi, In general connecting or touching dissimilar metal is not allowed due to galvanic erosion issues. What about the stainless steel instrument impulse line connected to the carbon steel process lines which is very common. I am aware that ideally an insulating mean (e.g. an insulating flange...

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