This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of ZBY papermaking special liquid centrifugal pumps. This standard applies to ZBY papermaking special liquid centrifugal pumps (hereinafter referred to as pumps) for conveying dilute black liquor and other acidic and alkali corrosive liquids in the papermaking industry. QB/T 1443-1992 Technical requirements for ZBY papermaking special liquid centrifugal pumps QB/T1443-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Technical Conditions for ZBY Type Papermaking Special Liquid Centrifugal Pump Subject Content and Scope of Application
QB/T 1443—1992
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of ZBY Type Papermaking Special Liquid Centrifugal Pump.
This standard applies to ZBY Type Papermaking Special Liquid Centrifugal Pump (hereinafter referred to as pump) for conveying dilute black liquor and other acidic and alkali corrosive liquids in the papermaking industry.
2 Reference standards
GB/T 699
Technical conditions for high-quality carbon turbulent structural steel
GB/T 1220
Stainless steel bars
GB/T 1804
GB/T 2100
GB/T 3216
Tolerances and fits
Limit deviations of dimensions without tolerances
Technical conditions for stainless acid-resistant steel castings
Test methods for centrifugal pumps, mixed-flow pumps, axial-flow pumps and vortex pumps GB/T5656
Technical conditions for single-stage single-suction chemical centrifugal pumps
GB/T 6414
GB/T 9439
Casting Dimension Tolerance
Gray Iron Castings
GB/T11352
Casting Carbon Steel Parts for General Engineering
JB/T8Product Label
QB/T842General Technical Conditions for Light Industrial Machinery Weighing Instruments 3 Technical Requirements
3.1 Basic Requirements
3.1.1 The pump shall comply with the provisions of this standard and be manufactured in accordance with the working drawings and technical documents approved by the prescribed procedures. 3.1.2 The manufacturing technical requirements of the pump shall comply with the relevant provisions of QB/T842. 3.2 Pump Performance
3.2.1 When the pump leaves the factory, the allowable working range of the product shall be determined in accordance with the provisions of Article 2.1 of GB/T5656, and the performance indicators shall be given or the performance curve shall be drawn.
3.2.2 In the clean water performance test of the pump, the performance tolerance of the specified points shall comply with the provisions of Table 1. Table 1 Performance tolerance of specified points
Shaft power
Efficiency at the highest efficiency point
3.2.3 If the performance of the specified point is unqualified, when it is necessary to turn the impeller diameter, the turning amount shall not exceed 5% of the original diameter. 3.3 Quality requirements for main parts
Approved by the Ministry of Light Industry of the People's Republic of China on February 21, 199234
Implementation on August 1, 1992
QB/T 1443—1992
3.3.1 For the castings of pump casing, impeller, rear cover, sleeve and bearing seat, if the material is stainless and acid-resistant steel, it shall be quenched according to GB/T2100, and the other materials shall be treated to eliminate internal stress. 3.3.2 For pump casing and impeller castings, the tolerance grade of the size of the flow-through part not specified in the drawing shall comply with the CT10 grade specified in GB/T6414 if it is sand molded manually, and shall comply with the CT7 grade if it is investment casting, see Table 2. Casting flow-through part size tolerance grade value
>10～16
～160
～250
～400
3.3.3 The impeller shall be statically balanced after machining, and its balance accuracy shall not be lower than the G6.3 grade specified in Appendix B of GB/T5656. mm
～1000
3.3.4 The pump casing and rear cover shall be subjected to a hydrostatic pressure test, the test pressure shall be 1.5 times the working pressure, the test shall be conducted with clean water at room temperature, and the holding time shall not be less than 10 minutes, and there shall be no leakage.
3.3.5 The tolerance of the unmarked tolerance size of the parts metal cutting shall comply with the 14-grade accuracy specified in GB/T1804, H14 for holes, h14 for shafts, and ±IT14 for lengths. bzxz.net
The materials and casting quality of the main parts of the pump shall comply with the following standards: 3.3.6
High-quality carbon structural steel shall comply with the provisions of GB/T699; stainless acid-resistant steel shall comply with the provisions of GB/T1220; b.
Stainless acid-resistant cast steel shall comply with the provisions of GB/T2100; carbon cast steel shall comply with the provisions of GB/T11352, and gray cast iron shall comply with the provisions of GB/T9439. 3.4 Assembly requirements
3.4.1 Before assembly, the following anti-rust treatment and painting should be performed: a.
The surface of the bearing oil storage chamber should be cleaned and painted with oil-resistant enamel; the exposed machined surface should be treated with grease or other paint for anti-rust (except for stainless acid-resistant steel). 3.4.2 The radial runout of the relevant parts of the assembled rotor parts should not exceed the requirements of Table 3. Table 3
Radial runout of the outer circle of the shaft sleeve (or impeller sleeve) in contact with the seal Radial runout of the outer circle of the front sealing section of the impeller at 10 mm from the end face 120
Definition size
3.4.3 After assembly, the center line of the impeller outlet should coincide with the center line of the pump casing flow channel, and the error should not be greater than 2mm. If the pump shaft is equipped with a centrifugal block, it should be adjusted to ensure that the center line of the impeller outlet coincides with the center line of the pump casing flow channel during operation. 3.4.4 Relative offset of the two shafts connected by the coupling: a. The radial offset at half of the maximum outer diameter of the two half couplings shall not exceed 0.2mm. b. The parallelism error of the end faces of the two half couplings shall not exceed 0.15% of their outer diameter. 3.4.5 The packing seal shall not leak, and the mechanical seal is allowed to have no more than 20 drops of leakage per minute. 3.4.6 During the operation of the pump, the bearing temperature rise shall not exceed 40℃, and the maximum temperature shall not exceed 80℃. 3.4.7 After assembly, the rotation of the rotor shall be light and flexible, the axial moving device shall not be blocked, and the whole machine shall run smoothly without abnormal vibration. When the sound level meter is used to measure the noise, the sound pressure level limit shall not be higher than the provisions of Table 4. 35
Motor synchronous speed
QB/T 1443--1992
Table 4 Noise limit value
3.4.8 All purchased supporting components shall have a certificate of conformity. 3.5 Complete machine supply scope
Completely assembled pumps, including pump body, motor, coupling and base, a.
b. Wearing parts.
4 Test methods and inspection rules
4.1 Test methods
4.1.1 Operation test
Motor power
10% (not less than 2 units) of each batch of pumps should be sampled for clean water operation test. The test should be carried out when the flow rate is the midpoint of the performance, and the test time shall not be less than 0.5h. During the test, the leakage of the packing seal and mechanical seal should be checked. The bearing temperature rise and maximum temperature and the unit noise should meet the requirements of Articles 3.4.5 to 3.4.7 respectively. If there are unqualified products, double sampling or full testing should be decided according to the nature of the problem. In the operation test, the bearing temperature is measured by using a semiconductor point thermometer on the outer surface of the bearing seat where the bearing is installed.
4.1.2 Clean water performance test and noise measurement
The clean water performance test and noise measurement of the pump shall be carried out according to the splashing method of flow rate, head, speed, shaft power and noise in GB/T3216. The accuracy requirement is Class C.
4.2 Inspection rules
4.2.1 Factory inspection
4.2.1.1 The pump shall be inspected and qualified by the quality inspection department and the product quality certificate shall be issued before it can be shipped. 4.2.1.2 Each pump shall be inspected for factory clean water performance at specified points. The inspection results shall comply with the performance parameters of the pump at the specified points, such as flow rate, head, shaft power and speed, and comply with the provisions of Article 3.2.2. 4.2.2 Type inspection
4.2.2.1 After the trial production, identification, finalization or formal production of new products, such as: when there are major changes in structure, materials, and processes that may affect product performance; and when the national quality supervision department makes a request; type inspection should be carried out. The content of type inspection is all technical requirements of this standard. The type inspection of the pump can be carried out at the manufacturer or at the user. The inspection results should meet the requirements of various performance parameters of the pump. 4.2.2.2
After the manufacturer's inspection is passed, the water in the pump should be removed and the following treatment should be performed: a.
The exposed machined surface should be coated with hardened anti-rust oil,
The external non-machined surface should be cleaned of rust and oil, and primer, putty and topcoat should be applied; b.
After anti-rust treatment and surface painting, the inlet and outlet of the pump should be sealed. Stainless acid-resistant pots do not need to be rust-proofed. 5.1 Each pump should be equipped with a product label in a conspicuous position. The label content includes: a.
Manufacturer's name;
Pump name and model;
Pump technical specifications: flow rate (m2/h), head (m), speed (r/min), equipped motor power (kW), total weight (kg); c.
Pump product number and manufacturing date.
5.2 A metal sign with an arrow is installed at the corresponding part of the pump to indicate the rotation direction of the pump. The type and size of the sign must comply with the provisions of 36
JB/T8.
5.3 The packaging of the pump shall comply with the provisions of QB/T842.8. QB/T 1443--1992
The factory documents include: product certificate, product instruction manual and packing list. The documents should be packed in a waterproof document and nailed in the box.
5.4 Measures should be taken during transportation to avoid damage caused by vibration and collision. 5.5 The pump should be prevented from rust and damage during storage. The oil seal of the pump is valid for twelve months. It should be inspected and re-sealed when it expires. 6 Quality Assurance
If the user complies with the storage and use rules, the manufacturer shall be responsible for repairing or replacing product parts for free if the product is damaged or malfunctions due to poor manufacturing quality within 18 months from the date of shipment from the manufacturer, and the continuous operation does not exceed 12 months.
Additional Notes:
This standard was proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard was drafted by Tianjin Light Industry Machinery Factory. 37
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