177、liquid level measurement and control measures of propane full tank - doer equipment
classification：industry publishtime：2021-04-12 08:35:41
177、liquid level measurement and control measures of propane full tank -凯时登录
liquid level measurement and control measures of propane full tank
the full tank is equipped with two servo level meters and one radar level meter to continuously measure the liquid level in the tank. the servo level meter and radar level meter (sil2 certification) output 4 ~ 20ma signal to the sis system of the user in the control room. at the same time, the high and low switches are provided for the ultra-high or ultra-low liquid level interlock of the tank. at the same time, the signal is output to dcs for liquid level display.
the design, installation and replacement of the liquid level gauge shall not affect the operation of the tank, and the full bore ball valve shall be used to connect with the tank body. prevent liquid overflow caused by too high liquid level or empty tank produced by starting pump or compressor when too low liquid level. one servo level gauge can be used for density detection, and the medium density of different liquid level heights in the tank can be measured.
temperature measurement facilities are set on the inner tank, tank wall and tank bottom of full capacity tank.
the tank wall and tank bottom are equipped with multi-point armored thermal resistance (the thermal resistance and the extended shielded cable are packaged in a stainless steel protective tube)（ φ the protective tube is filled with mgo.
a set of average thermometer with multi-point temperature transmitter is set in the inner tank liquid. multi point temperature transmitter and average thermometer output modbus-rs485 signal to dcs system of control room for display, which can ensure accurate temperature measurement at different positions of storage tank during start-up precooling and normal operation, and meet the production operation needs of uniform cooling precooling and flexible adjustment.
a temperature measuring point is set at the bottom of the inner tank insulation foundation to detect whether there is liquid leakage.
in addition, an armored thermal resistor is set on the tank vent pipeline, and the rtd signal is output to dcs system for display and alarm.
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