The paper presents the results of research and development (hereinafter referred to as R&D) of a standard range of high-reliability liquid level float switches (LLS) carried out by The Pipeline Transport Institute in cooperation with TOMZEL JSC to meet the needs of oil and oil products pipeline transportation facilities, as well as various industries (food, chemical, etc.).
The paper presents the analysis results of the main causes of failures of the LLSs operated at the facilities of the main pipeline transportation of oil and oil products, provides the main design solutions aimed at improving the LLS reliability.
The authors discuss the basic operating principles of test benches developed as part of the R&D, which allow testing the LLS elements and carrying out 100 % final inspection before sending to the customer’s facility.
Increase in the reliability of the developed LLSs is achieved through design solutions based on the use of highly reliable elements and modern innovative materials in the LLS design and the implementation of additional protection against the external environment, mechanical and electromagnetic effects. Also, the LLSs use a reed switch module consisting of three parallel reed switches with certain resistances. This design allows diagnosing the failure of one of the reed switches, short circuit and breakage of signal lines by monitoring the circuit current. This is a significant advantage compared to known counterparts, since a signal line break or a short circuit will not be mistaken for an output liquid level signal, which also increases the device reliability and the objectivity of liquid level monitoring.
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