1 Subject Content and Scope of Application 1.1 Subject Matter This Regulation stipulates the inspection intervals and contents, maintenance and quality standards, commissioning and acceptance, maintenance and fault handling of low-temperature vertical multistage centrifugal pumps. 1.2 Scope This procedure applies to low-temperature vertical multistage centrifugal pump maintenance and repair, other vertical centrifugal pump maintenance can refer to the implementation. 2 to prepare a revision according to the current national regulations on pressure vessels, including the current "Special Equipment Safety Supervision Regulations", "pressure vessel safety technology supervision regulations" (See Table 1) Table 1 Maintenance cycle Month Maintenance category Minor overhaul Overhaul period 12 ~ 18 24 ~ 30 Note: According to the operation and status monitoring results, may extend the inspection period. 2 overhaul 2.1 minor repair 2.1.1 overhaul mechanical seal; 2.1.2 check the bearing and decompression sleeve clearance: 2.1.3 inspection and handling of parts and components in the operation of the damage and leakage; 2.1.4 inspection, cleaning the sealed chamber, Isolation cylinder, to the pump, pressure balancer, heaters, etc., to replace the seal oil and antifreeze; 2.1.5 check the shaft and connecting bolts, adjust the coupling coaxiality; 2.1.6 check, clean the pump inlet filter Check the outlet check valve. 2.1.7 check and restore cold. 2.2 Overhaul 2.2.1 Including minor repairs 2.2.2 Disintegration inspection of parts wear, corrosion and erosion, repair or replacement; 2.2.3 Check, adjust the shaft straightness, if necessary, replace; 2.2.4 Check 2.2.5 check the zero, with the size of the components; 2.2.6 measurement, adjust the level of the pump body; 2.2.7 check the static balance of the impeller, if necessary, balance the impeller; 2.2.8 electrical, Instrument repair reference to Sinopec standards. Maintenance and quality standards 1 Preparation before maintenance 1.1 The preparation work should be consistent with the safety, environmental protection, quality and other requirements, such as in accordance with Q / SHS 0001.3-2001 "Refining and Chemical Enterprises Safety, Environment and Health (HSE) Management Code" ( Trial implementation) of the provisions of the maintenance process hazard identification and risk assessment, environmental factor identification and impact assessment, and for the relevant documents; 1.2 based on technical conditions and monitoring of equipment records, analysis of the cause and location of failure to develop a detailed technical solutions overhaul ; 1.3 familiar with the design drawings and technical information; ready to record the form; 1.4 maintenance work required, the amount of cards with Qi; 1.5 Qi expected replacement parts required for maintenance, and meet the design requirements; 1.6 in accordance with the provisions of the power, Emptying, replacement, etc., with maintenance conditions, for safety inspection work ticket before construction; 1.7 Preparation of a certain amount of acetone or high purity alcohol degreasing cleaner, non-use of kerosene, wash oil, water, solvents and other cleaning pump Internals; 1.8 overhaul of construction safety issues should be implemented, "China Stone Chemical Group's production safety management system, "the relevant provisions of 1.9 with sealing liquid to be empty sealing liquid. 2 Disassembly and Inspection 2.1 Disassembly 2.1.1 Loosen the mechanical seal bushing clamping ring locking screw so that the bushing and shaft can move relative to each other; 2.1.2 Disassemble the coupling; 2.1.3 Disassemble the auxiliary pipe, 2.1.4 remove the drive machine and rack; 2.1.5 disassemble the mechanical seal assembly; 2.1.6 the pump head together with the rotor assembly hanging out, shipped to disintegration site; Bearing; 2.1.8 in turn disassemble all levels of impeller and impeller, and make a mark. 2.2 Check 2.2.1 Check the mechanical seal components; 2.2.2 Check the bearing wear; 2.2.3 Check the impeller, the fluid guide wear, corrosion, erosion, with the gap; 2.2.4 Check the shaft wear and straightness; 2.2.5 check the wear ring gap; 2.2.6 check other parts.
