Low-temperature leakage detecting liquid used for air tightness detection of liquid propellant storage and transportation device

Abstract

The invention provides a low-temperature leakage detecting liquid used for air tightness detection of a liquid propellant storage and transportation device. The raw constituents of the low-temperature leakage detection liquid are water, a low-temperature solvent, a surfactant, SDS (Sodium Dodecyl Sulfate) and disodium hydrogen phosphate; the raw constituents are mixed uniformly according to a proportion to form the low-temperature leakage detecting liquid. The low-temperature solvent is ethanol or ethylene glycol; the surfactant is any one of octyl alkylphenol polyoxyethylene ether, nonyl phenol polyethenoxy ether and phenethyl phenol polyoxyethylene ether; the SDS serves as an additive agent for improving stability of bubbles, and the disodium hydrogen phosphate serves as a corrosion inhibitor. The low-temperature leakage detecting liquid can be used for air tightness detection of the liquid propellant storage and transportation device in an environment at 0 to -50 DEG C, is strong in bubbling capability, good in air bubble stability and strong in anti-freezing capability, can efficiently solve the problem that a common leakage detecting liquid when being used in a low-temperature environment is frozen, and improves leakage detection reliability and operation safety of the liquid propellant.

Description

technical field [0001] The invention relates to the field of low-temperature air-tightness inspection, in particular to an antifreeze low-temperature leak detection liquid required for air-tightness inspection of liquid propellant storage and transportation equipment and pipelines in winter when the temperature is low. Background technique [0002] Conventional liquid propellants have the advantages of high specific impulse, stable combustion performance, and easy storage, and are widely used in military and aerospace fields. Safety and reliability in the process is of paramount importance. During the liquid propellant support process at the space launch site, in order to prevent liquid propellant leakage during the operation, before the start of the liquid propellant task, the operator must check the gas pipe, liquid pipe, valve body connection, storage tank, etc. To check the airtightness of the equipment, the method of smearing soapy water is generally used to detect lea...

AI Technical Summary

Problems solved by technology

The leak detection method mentioned in "Liquid Liquid Propellant" (National Defense Industry Press, first edition in 2004) "wipe soap in clear water to make a leak detection liquid, apply soap foam with a brush and brush on the parts where leakage may occur, Observe whether there are bubbles popping out", this method is simple and effective at room temperature, but when the outdoor equipment is below 0°C in winter, the leak detection liquid is prone to freezing, and at minus 20°C, it only takes 5 seconds to freeze. Thus affecting the reliability of the air tightness inspection, there are certain safety hazards in the liquid propellant operation process

[0004] Based on the above problems, we developed the present invention, and the Gansu Science and Technology Information Research Institute, a national first-level scientific and technological novelty search consulting unit, conducted a patent novelty search and issued a patent search report with the report number 20146220047. The novelty search conclusion: this novelty search project The low-temperature leak detection liquid developed for the airtightness inspection of liquid propellant storage and transportation equipment has no similar patent or chemical reaction characteristics in its composition, ambient temperature, use mode and related propellant compatibility and chemical reaction characteristics. Literature report

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