For leak detection,the detects gases are recommendedsuch as butane(C_4H_(10)),carbon dioxide,ether,acetone,carbon tetrachloride,benzene etc. The coefficient of sensitivity(φ)of these test gases instead of airis 11,2,6.4,4.5,2,and 1.3 respectively.
This artide introduces the method of blast furnace cooling wall leak hunting using the computer technique and introduces the principle and process in designing upper computer software,and it also discusses the method of data transfer and treatment to measuring temperature of many key points in blast furnage cooling wall using computer software and the key problems of software designing.
A New Leak Detecting Method: the Negative Pressure Sampling Method
for the equipments used at temperature >80 ℃ and 0.6 MPa or for filling toxic matter,it is necessary pressure in turn to add ammonia leak detecting and helium leak detecting according to the situation;
This paper describes the structure, working theory, design scheme, experiment method and experiment results of a multiple showing gas leak detection equipment consisting mainly of quadrupole mass spectrum, which s suitable for leak detecting in atmosphere.
The cuff leak test to predict failure of tracheal extubation for laryngeal edema
Average concentrations of PGME of 82.2 mg/m3 (22.3 ppm), 68.6 mg/m3 (18.6 ppm) and 11.3 mg/m3 (3.1 ppm) were found in the air of the brakehose production, leak test and mounting areas, respectively.
The highest internal exposure levels were found in the brakehose production section and in the leak test area.
The average post-shift concentrations for PGME in workers in the brakehose production section were 4.6 mg/l in urine and 13.5 mg/l in blood; the corresponding figures for workers in the leak test area were 4.2 mg/l in urine and 11.0 mg/l in blood.
Leak test based on the bubble emission technique showed that the bonded microfluidic device can withstand at least six bars (87 psi) of internal pressure (gauge) in the microchannel.