Request for instrument selection and explosion-proof design for the liquid ammonia storage tank area
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1. What is the explosion-proof selection for instruments in the liquid ammonia storage tank area? Should transmitters, magnetic flip plates, etc. be chosen as intrinsically safe or explosion-proof types? How to select an electric valve? 2. How should the ammonia leak detection system be selected for this area? 3. What type of instrument should be used for measuring ammonia flow rate? I earnestly ask for your advice, experts! ! !
If necessary, can I go to the company to take a look and let you know, OP! Magnetic flap level gauges are not recommended! The inspection of ammonia tanks is generally carried out every 5 years; after all, no magnetic flip valves can last that long! There are specialized gas alarms for ammonia leaks! Our company is currently using radar with an antenna, but I think differential pressure sensors are still more effective! I wonder where the original poster is from? If it’s in a place with a large temperature difference, the differential pressure might not work well either! When the temperature is high, ammonia vaporizes, and the differential pressure cannot be measured accurately! The equipment selected must not have any parts made of copper, including the gaskets inside the valves that are not visible; otherwise, leaks will occur. The gaskets and flanges must be able to withstand high pressures without being corroded! Use double-ended high-pressure studs for connections whenever possible!
Personal opinion! For public reference! Please feel free to point out any shortcomings!
For leak detection, fixed explosion-proof detectors with audio and visual alarms can be installed on-site, with the signals being sent directly to the control room. Typically, electrochemical detectors for toxic gases (ammonia) are used on-site, with a range of 0-100 ppm.