Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr
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RESOLUTION COPPER a double-bolted coupling designed for use with Schedule 80 or heavier grooved steel pipe. Typical applications include paste backfill, high-pressure slurry and other solids piping systems. With the ability to withstand working pressures of up to 4,000 psi—the highest pressure rating available for any grooved mechanical pipe joining system—the 808 was well suited for the 3,500 psi chilled water system. The system provides superior joint integrity at high pressures while maintain- ing a degree of flexibility to facilitate join- ing and accommodate up to about 1/4 in. of linear movement per coupling. This flexibility provided the necessary leeway for the thermal expansion and contraction of the pipe when subjected to the heat within the shaft. The coupling keys of the 808 engage four grooves—two on each pipe-end. The double-groove engagement of mating coupling keys provides joint integrity at high pressures by distributing pipe end loads. Maximum end load from all inter- nal and/or external forces to which the joint can be subjected under working conditions ranges from 103,410 lb on 6-in. schedule 80 pipe, to 319,190 lb on 12-in. schedule 160 pipe. This end-load A pressure reduction station converts high water pressures to safe handling levels. performance gave Cementation the ability to assemble the system without extra pipe supports. The heavy-duty ductile iron housings of the Style 808 ensure firm, secure engage- ment of the pipe. The housing design pro- vides increased strength at points of high stress for high-pressure security. Double bolting on each side reinforces the double- groove positioning for positive high-pres- sure reliability. The profile of the double groove is the same as that of a standard single cut groove, with the exception that there are two grooves on each pipe-end instead of one. The 808 does not require special www.e-mj.com JUNE 2012 • E&MJ; 109