shaft for straightness, noting that the maximum total indicator reading (TIR) at the sleeve journal and coupling journal cannot exceed 0.002 in. (Figure 4). Implementing all of these maintenance recommendations may seem daunting, but it is only through a routine such as this that CPI operations can maximize the service life of equipment while enhancing the safety of plant personnel and the environment. Figure 4. Shaft run-out must be checked at both the coupling end and the mechanical seal end. Maximum run-out is 0.002 in. total indicator reading (TIR) Bearing housing - Visually inspect for signs of wear, corrosion, cracks or pits. Replace housings if worn or out of tolerance. Seal chamber/stuffing box cover - Visually check for cracks, pitting, erosion or corrosion, paying special attention to any wear, scoring or grooves that might be on the chamber face. Replace if worn more than 1/8-in. deep. Shaft - Check the shaft for any evidence of corrosion or wear. Check the diaphragm pumps The invention of air-operated doublediaphragm (AODD) pump technology in 1955 was a textbook example of necessity being the mother of invention. The invention of AODD pump technology was the climax in an ongoing search for a way to effectively and efficiently pump substances with a wide range of viscosities - from water to slurries to cement - at a wide range of flowrates. The technology, which was said to have been Circle 24 on p. 78 or go to adlinks.che.com/35070-24http://adlinks.che.com/35070-24