EFFICIENCY OF PROTECTIVE MEMBRANES FOR LIQUID CO2 RESERVOIRS.

Since strength property data on membranes made from different materials in the assigned temperature range is very limited, the authors chose for evaluation Ta, Ni, and steel 12Kh18N10T, since they have the most stable mechanical properties, rigid structures, and also high corrosion resistance. The tests consist of rupturing 50 and 55 mm diameter Ni and Ta membranes (membrane unit type MPU-1), and also slapping 50 mm diameter membranes of steel 12Kh18N10T (membrane unit type MPU-4). The membranes were subjected to nondestructive control tests at 20 degree C. The tests were carried out at temperatures of ( minus 35 plus or minus 5) degree C, (20 plus or minus 3) degree C, and (55 plus or minus 5) degree C. Normal rupture pressure for a membrane was 1. 8 to 2. 8 MPa. The scatter of rupture pressures within the groups did not exceed 0. 25 MPa in the positive temperature range but attained 0. 5 MPa at negative temperatures. The most constant results were obtained for membranes of Ni NP-2; at normal working pressures 1. 8-21. MPa the rupture pressure scatter did not exceed 0. 3 MPa in all the temperature ranges.