1 thematic content and scope of application
1.1 Thematic content
This code specifies the low temperature vertical multistage centrifugal pump inspection cycle and content, overhaul and quality standards, commissioning and acceptance, maintenance and troubleshooting.
1.2 The scope of application
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 revised basis
The current national laws and regulations on pressure vessels, including the current "Special Equipment Safety Supervision Regulations", "Pressure Vessel Safety Technology Supervision Regulations", "pressure vessel inspection procedures"
Technical information, Sinopec standards (sealing, electrical, instrumentation)
Maintenance cycle and content
1 inspection cycle (see Table 1)
Table 1 Maintenance cycle month
Maintenance category | Minor repair | Overhaul |
Maintenance cycle | 12 ~ 18 | 24 ~ 30 |
Note: According to operating conditions and status monitoring results, may be appropriate to extend the inspection cycle.
2 maintenance content
2.1 minor repairs
2.1.1 overhaul mechanical seal;
2.1.2 Check the bearing and decompression sleeve clearance:
2.1.3 inspection and handling operations occurred in the parts damage and leakage;
2.1.4 check, clean the sealed chamber, isolated fuel tank, to the pump, pressure balancer, heaters, etc., to replace the seal oil and antifreeze;
2.1.5 check the shaft and connecting bolts, adjusting the coupling shaft 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 the wear and tear of parts, corrosion and erosion, repair or replacement;
2.2.3 check, adjust the straightness of the shaft, if necessary, replace;
2.2.4 Check the runout of the rotor;
2.2.5 check zero, the size of the components;
2.2.6 measurement, adjusting 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 maintenance refer to the relevant standards of Sinopec.
Overhaul and quality standards
1 before maintenance preparation
1.1 All preparations shall comply with the requirements of safety, environmental protection and quality. For example, according to the provisions in Q / SHS 0001.3-2001 "Safety, Environment and Health (HSE) Management Practices of Refining and Chemical Enterprises" (for trial implementation), the maintenance process Conduct hazard identification and risk assessment, environmental factor identification and impact assessment, and handle relevant tickets;
1.2 According to the technical status of equipment operation and monitoring records, analysis of the cause and location of the failure to develop a detailed technical solutions overhaul;
1.3 familiar with design drawings and technical information; ready to record the form;
1.4 maintenance work required, the amount of cards with Qi;
1.5 ready for the expected maintenance required replacement parts, and meet the design requirements;
1.6 According to 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 and other degreasing grease cleaning agents, non-use of kerosene, wash oil, water quality solvents, such as cleaning the pump parts;
1.8 overhaul of construction safety issues, the implementation of "Sinopec Group Company safety management system" of the relevant provisions;
1.9 with sealing liquid to be empty sealing liquid.
2 disassembly and inspection
2.1 Disassembly
2.1.1 Loosen the mechanical seal sleeve clamping ring locking screw, the sleeve and the shaft can move relative to;
2.1.2 dismantling the coupling;
2.1.3 remove the ancillary pipeline, the nozzle package, to prevent foreign matter into;
2.1.4 Remove the driver and rack;
2.1.5 Remove the mechanical seal assembly;
2.1.6 The pump head together with the rotor assembly hanging out to the disintegration site;
2.1.7 demolition seal and bearings;
2.1.8 Disassemble the diversion impellers and impellers in turn and mark them well.
2.2 check
2.2.1 Check the mechanical seal assembly;
2.2.2 Check the bearing wear;
2.2.3 check the impeller, 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.
3 maintenance quality standards
3.1 mechanical seal
Mechanical seal overhaul the implementation of SHS "common parts and chemical equipment maintenance and quality standards"
3.2 rotor
3.2.1 Guide bushing cylindrical diameter and roundness deviation shall not be greater than the inner diameter of the bushing 1 ‰, but the maximum shall not exceed 0.05mm;
3.2.2 sleeve and shaft contact surface roughness should not be greater than Ra 1.6;
3.2.3 Impeller and shaft should be used with H7 / h6;
3.2.4 newly replaced impeller should be looking for static balance, the remaining unbalanced weight shall not be greater than the value given in Table 2.
Table 2 remaining unbalanced weight
Impeller outer diameter / mm | ≤200 | 201 ~ 300 |
Unbalanced mass / g | 1 | 2 |
3.2.5 impeller with trachoma, cracks or serious erosion, reduction of defects such as books, should be repaired or replaced;
3.2.6 impeller and shaft with the top key should leave 0.10 ~ 0.40mm gap;
3.2.7 shell wear ring and impeller wear ring gap shown in Table 3;
3.2.8 Sleeve and journal clearance in Table 4;
3.3 spindle part
3.3.1 Journal cylindrical and roundness should be less than the diameter of 5 ‰, but the maximum does not exceed 0.03mm ,, roughness should not exceed Ra 0.8;
Table 3 wear ring gap
Wear ring diameter | Wear ring | gap |
Standard clearance | Extreme clearance |
<100 ≥100 | 0.30 ~ 0.40 0.40 ~ 0.50 | 0.80 1.00 |
Table 4 Bushing and journal clearance
Shaft diameter | Bushing and shaft clearance |
Standard clearance | Extreme clearance |
<40 ≥40 | 0.20 ~ 0.30 0.30 ~ 0.40 | 0.50 0.80 |
3.3.2 Shaft deviation of straightness shall not exceed 0.03mm / m, or should be straightened.
3.4 assembly process adjustment and correction
3.4.1 rotor axial initial adjustment: the bottom of the adjustment bolt to the axial clearance adjusted to 0.30 ~ 0.40mm, with a lock nut locking;
3.4.2 pump and driver to find out: the coupling is correct, the radial deviation value should be less than 0.05mm, the axial deviation value should be less than 0.03mm;
3.4.3 Rotor lift: For the vertical limit bearing mounted on the motor vertical pump, with a rotating adjustment plate rotor volume adjustment, the adjustment plate and the distance between the short section "A" axis The net increase, see Figure 1. For axial limit bearing mounted on the vertical pump pump, you can install according to the limit.
3.4.4 The amount of the end of the tight coupling bolts, the seal sleeve clamping ring set screw locking, loosen the sleeve positioning piece and twist about 45 °, with a screw on the seal chamber cover.
Test and acceptance
1 before the test preparation
1.1 to confirm that all the overhaul work has been completed, the overhaul record is complete, the overhaul quality complies with the inspection and maintenance quality standards of this code, and a test program;
1.2 Dry with nitrogen until the dew point in the pump is below the required temperature; (The methane recirculation pump should have a dew point below -70 ° C.)
1.3 double and tandem mechanical seal, should check whether the sealing liquid, separator and so on;
1.4 According to pump instructions, the gas pre-cooling pump and liquid pre-cooling, so that it reaches the operating temperature; in the pre-cooling process, according to operating instructions car;
1.5 Check lubrication, sealing liquid, material system for leaks;
1.6 hand crank should be no abnormal sound and no unevenness.
2 test
2.1 point pump, confirm the pump rotation direction. After starting the pump, check the temperature and leakage in the sealed chamber. Sealed chamber temperature should be controlled at 40 ~ 50 ℃, but the maximum can not exceed 65 ℃;
2.2 check the vibration of the pump, the vibration value of Table 5.
Table 5 Vibration standards
Speed ​​/ (r / min) | 1500 | 3000 |
Vibration value (full width) / μm | <38 | <25 |
2.3 current, voltage steady, no noise during operation, mechanical seal leakage within the specified range;
2.4 outlet pressure, flow to meet the technical requirements.
3 acceptance
3.1 test pass, to achieve good standards;
3.2 maintenance technical information is complete and accurate;
3.3 The above requirements to achieve, for acceptance procedures,
3.4 Acceptance information includes: the original record of inspection; overhaul records; identification of replacement parts; test records.
Maintenance and troubleshooting
1 routine maintenance
1.1 maintenance content
1.1.1 Check the pump vibration, sound and leakage with or without abnormal, found abnormal timely manner;
1.1.2 check the pump inlet and outlet pressure is stable; flow is stable;
1.1.3 Check the sealed chamber temperature, high temperature and timely treatment;
1.1.4 Check and confirm the sealing oil and barrier fluid level, if necessary, supplement or replacement;
1.1.5 Check the standby pump standby state, standby pump hand crank 1 class.
1.1.6 check the insulation, cold conditions.
2 common faults and handling (see Table 6)
Table 6 common faults and handling
Maintenance category
Minor repair
Overhaul
Maintenance cycle
12 ~ 18
24 ~ 30
Impeller outer diameter / mm
≤200
201 ~ 300
Unbalanced mass / g
1
2
Wear ring diameter
Wear ring
gap
Standard clearance
Extreme clearance
<100
≥100
0.30 ~ 0.40
0.40 ~ 0.50
0.80
1.00
Shaft diameter
Bushing and shaft clearance
Standard clearance
Extreme clearance
<40
≥40
0.20 ~ 0.30
0.30 ~ 0.40
0.50
0.80
Speed ​​/ (r / min)
1500
3000
Vibration value (full width) / μm
<38
<25
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