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Machinery Component Maintenance and Repair Part 5

Tham khảo tài liệu 'machinery component maintenance and repair part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 150 Machinery Component Maintenance and Repair Design Pressure Loads The pressure at the most severe condition of coincident internal or external pressure and temperature expected during normal operation. Weight Loads Dead weight loads including pipe components insulation etc. Live weight loads imposed by service or test fluid snow and ice etc. Dynamic Loads Design wind loads exerted on exposed piping systems Earthquake loads must be considered for piping systems where earthquake probability is significant Impact or surge loads typically due to water hammer letdown or discharge of fluids Excessive vibration arising from pressure pulsations resonance caused by machinery excitations or wind loads Thermal Expansion Contraction Effects Thermal and friction loads due to restraints preventing free thermal expansion Loading due to severe temperature gradients or difference in expansion characteristics Effects of Support Anchor and Terminal Movements Thermal expansion of equipment Settlement of equipment foundations and or piping supports The When Who What and How of Removing Spring Hanger Stops Associated with Machinery Initial Tasks Prior to Machinery Commissioning Align machinery without pipe attached Adjust pipe for proper fit-up and make connection Process Machinery Piping 151 Observe alignment of machinery with pipe being attached. If excessive movement is noted the pipe is to be disconnected and modified until misalignment is brought within the limits permitted. If the pipe is greater than 8 in. NPS one may need to add sandbags or similar weights to the pipe at the hanger adjacent to machinery to simulate the operating condition of the pipe. Pull stops on all system hangers Check to determine that no hanger travel indicator moves out of the 1 3 total travel cold setting zone. If travel is excessive refer immediately to the design contractor for modifications of support. Adjust the hanger to return travel marker to the C position Record alignment of machinery .