Field Testing of Submersible Cable
The increased number of installations of submersible pumps in the oilfield has brought about an increased need for decreasing the operating costs associated with the cable. The devices and methods of field testing the cable are explained, and the results of application of different testing parameters and techniques are evaluated. The effect of temperature on the insulating material is presented. Specifications and standards for manufacturing and factory testing of submersible cable are also discussed.
Power Cable Standards and Industrial Applications
The relationship between recognized insulated power cable specifications and their application to the pulp and paper industry is discussed. Differences in wall thicknesses and the relationship between grounded, ungrounded, and percent of insulation level are pointed out. An explanation of ampacity ratings, the various tables available, and how shields should be related to short circuit current is provided. The effect of aging on cable life and a description of objectives of field tests with recommended test values are included.
Experimental study on bond behavior between high-strength grout and deformed steel bars
Abstract Engineers use high-strength grout to connect precast concrete members for its low shrinkage and good fluidity. This paper designed 87 central pull-out specimens using the control variable method to investigate the influence of factors on the rebar-grout bond property such as compressive strength, steel grade, bar diameter, transverse stirrups, and bond length. The test result showed that improving grout compressive strength (85.8 MPa–122.7 MPa) cannot improve the bond strength, which was different from the previous conclusions of concrete pull-out tests. Simplified formulas were presented for calculating the characteristic values of bond strength, residual strength, peak slip, and relative slip of load-holding platform based on parameter analysis. Then, a constitutive model was proposed to predict the full-range bond stress-slip curve of high-strength grout and steel bar specimens from bearing to failure. Finally, FEA models were established to evaluate the applicability and accuracy of the constitutive model.