SPI/Mobile Pulley Works, Inc. specializes in building dredge equipment and wear components. Over the years SPI/MPW has become ... know for it ball joints and dredge/slurry pumps. Industrial castings and parts are also made for other industries. Full services in one location: engineering, pattern shop, foundry, large fabrication, and machine shop. Steel (A27, A148 through some A915) and white iron castings with pours up to 60,000 pound pours. read more