This standard describes bolted, split-sleeve couplings used to join plain-end pipe of similar outside diameter. Couplings may be manufactured from carbon steel or stainless steel and are intended for use in systems conveying water, wastewater, or air used in water treatment. The standard covers nominal pipe sizes from 3/4 in. (20 mm) through 144 in. (3,600 mm). Its purpose is to provide minimum materials, design, testing, inspection, installation, marking, and shipping requirements.