Some standard content:
JB/T8688—1998
This standard is proposed and managed by the National Pump Standardization Technical Committee. Introduction
The responsible drafting units of this standard are: Zhejiang Electromechanical Design Institute, Shenyang Acid Resistant Pump Factory, Zhejiang Jiashan Sanfang Fiberglass Co., Ltd. The main drafters of this standard are: Li Yuzhen, Huang Xinhua, Cao Hongyan, Zhu Pusheng. 727
1 Scope
Machinery Industry Standard of the People's Republic of China
Plastic Centrifugal Pumps
Plastic centrifugal pumps
JB/T 8688-1998
This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, etc. of plastic centrifugal pumps (hereinafter referred to as pumps). This standard is applicable to pumps with a working pressure less than or equal to 1 MPa and conveying corrosive or non-corrosive liquids without solid particles. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB699—88Technical conditions for high-quality carbon structural steelGB1220--92Stainless steel bars
GB 2828—87
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches)GB 3216—89F
Test methods for centrifugal pumps, mixed flow pumps, axial flow pumps and vortex pumpsGB/T5656—94Technical conditions for centrifugal pumps (Class I)GB9239—88F
Determination of allowable imbalance for balancing quality of rigid rotorsGB/T13384—92General technical conditions for packaging of electromechanical productsJB/T 4297-—92
JB/T 8097---95
Technical conditions for painting of pump products
Vibration measurement and evaluation methods for pumps
JB/T 8098—95
5 Pump noise measurement and evaluation method
3 Type and basic parameters
3.1 Type
The pump type is single-stage, single-suction horizontal or vertical (including pipeline type). 3.2 Basic parameters
3.2.1 The basic parameters shall comply with the provisions of Table 1. Pumps with an inlet diameter of 50mm or more can be used with a reduced speed of one stage. The performance after speed reduction is in accordance with Table 2. The basic parameters in the table are the values of the specified points when the water is at room temperature. 3.2.2 The working range of the pump is shown in Figure 1, and the flow rate at the specified point is 3.2~200m/h and the head is 5.0~50m. For ordinary plastics, the flow rate at the specified point is not more than 50m2/h, and the head is not more than 32m. 3.2.3 The inspection and deviation of the basic parameters in the table shall be in accordance with the provisions of 6.4. Approved by the Ministry of Machinery Industry of the People's Republic of China on March 19, 1998, 728
Implemented on July 1, 1998
25×25-8
25X25-12. 5
25×25-20
40×32-12.5
40×32-20
40×32-32
50×32-20
50×40-20
50X32-32
50×40-32
50×32-50
50X40-50
65×50-20
65 × 50-32 | | tt | | 65 × 40-50 | 50
125×100-50
50×32-20
50×3 2-32 | |100×80-32
100×65-50
100×80-50|| tt||125×100-50
JB/T8688—1998
Table 1 Basic parameters
One-shot impeller Adhesion (welding) impeller 39
Basic parameters (speed reduction)
Speed n
Flow Q
Required NPSH Rating NPSHR
One-shot impeller
Adhesion (welding) impeller
Head H
JB/T 8688-1998
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09×99
209908
8- 28 0
3.3 Model marking and model indication method
3.3.1 Model marking
JB/T 8688--1998
The pump marking consists of three parts: the first part indicates the diameter of the suction port; the second part indicates the diameter of the discharge port (the pipeline type is consistent with the suction port diameter and is not indicated); the third part indicates the head at the specified point when the speed is 2900r/min. Marking example:
A pump with a suction port diameter of 65mm, a discharge port diameter of 50mm, and a specified head of 20m at a speed of 2900r/min is marked as 65X50-20
3.3.2 Model Representation Method
The writing of the pump model consists of two parts: the pump code and the mark. The pump code is represented by S for horizontal pumps and SL for vertical pumps. Example 1:
Horizontal plastic centrifugal pump with a suction port diameter of 65mm, a discharge port diameter of 50mm, and a head of 20m: S65X 50-20
Example 2:
Vertical plastic centrifugal pump with a suction port diameter of 50mm, a discharge port diameter of 40mm, and a head of 20m: SL50X 40-20
Example 3:
Plastic pipeline pump with a suction port diameter of 50mm, a discharge port diameter of 50mm, and a head of 20m: SL50-20
4 Direction of rotation
From the drive end, the pump rotates clockwise. 5 Technical requirements
The pump should comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. If the user has special requirements, it shall be implemented according to the agreement between the two parties.
For the technical requirements of the structural design, materials, manufacturing and other technical requirements of the metal parts of the pump, except for those specified in this standard, the rest shall comply with the relevant provisions of GB/T5656.
5.1 Product performance
5.1.1 The performance parameters of the pump shall comply with the provisions of this standard or the contract, and the performance deviation shall comply with the provisions of GB3216C level. 5.1.2 The manufacturer shall determine the allowable working range of the product and draw the performance curve (the relationship curve between head, efficiency, shaft power, required cavitation margin and flow rate).
5.1.3 When the pump is operating within the allowable working range, the vibration limit value shall comply with the provisions of JB/T8097. 5.1.4 When the pump is operating within the allowable working range, the noise limit value shall comply with the provisions of JB/T8098. 5.2 Structural design
5.2.1 The rotating parts of the pump should be statically balanced, and the balance level should comply with the G6.3 level specified in GB9239. When the unbalanced mass is less than 2g, the mass does not need to be removed. For the parts made of impeller, impeller nut and shaft sleeve, if the balance cannot be performed, the mold manufacturing accuracy should be improved. 5.2.2 The pressure-bearing parts and their fasteners should be subjected to water pressure test. The test pressure is 1.5 times the working pressure. No leakage, sweating and rupture are allowed.
5.2.3 If the screw holes for connecting pressure parts (pump body, seal body) are set on plastic parts, steel nut inserts should be embedded and avoid contact with the conveyed medium.
5.2.4 According to the use conditions and manufacturing process, the impeller can be designed as closed or semi-open, and the impeller should be made into an integrated type (secondary molding, welding molding or bonding molding).
5.2.5 The running clearance at the impeller sealing ring is selected according to Table 3. 731
Inner diameter of sealing ring
Diameter clearance
JB/T 8688--1998
Operating clearance
>60～100
5.2.6 When the pump uses a plastic sleeve, packing seal should be avoided as much as possible. 5.3Main parts materials
>100～150
5.3.1For the flow-through parts (pump body, pump cover, impeller, sleeve, sealing chamber, etc.), appropriate plastic materials shall be selected according to the chemical properties, pressure and temperature of the conveyed medium.
5.3.2For the shaft, 45 steel or stainless acid-resistant steel shall be used. 5.3.3The selection of sealing parts materials shall be compatible with the corrosion resistance of the flow-through parts. 5.4Manufacturing
5.4.1The roughness of the non-processed surface of the parts shall be guaranteed by the mold, and the roughness Ra value of the mold shall be at least two levels higher than that of the plastic parts. 5.4.2The bonding and welding of plastic parts shall not have defects such as scorching, fracture and cold welding. 5.4.3The surface of plastic parts shall be smooth, free of bubbles, poor resin plasticization, cracks, oil stains and other defects. 5.4.4After metal parts are processed, they shall not be bumped or scratched, and shall be kept clean and free of rust. 5.5 Assembly, painting and installation
5.5.1 All parts of the pump must be inspected and qualified before assembly. 5.5.2 The main parts should be interchangeable.
5.5.3 All fasteners should be tightened evenly and reliably. The height of the bolt extension should be basically the same. 5.5.4 It is not allowed to lift the pump at the inlet and outlet flanges and neck of the pump. 5.5.5 The painting of the metal parts of the pump should comply with the provisions of JB/T4297, and the plastic parts may not be painted. 5.5.6 The quality of the pipe fittings connecting the inlet and outlet of the pump during installation cannot be borne by the pump. 6 Test methods
6.1 The inspection of the physical properties of plastic materials shall comply with the standard regulations of the relevant departments for their materials, and be accompanied by an inspection certificate. 6.2 The chemical composition analysis method and mechanical property test method of metal materials shall comply with the provisions of GB699. and GB1220. 6.3 The parts under pressure shall be subjected to water pressure test according to the provisions of 5.2.2. The test medium is clean water at room temperature and the pressure is maintained for 10 minutes. 6.4 The pump performance test method and test accuracy shall comply with the provisions of GB3216C level. When the measured performance point is higher than the specified performance point and is judged to be unqualified, if it is only for turning the impeller diameter to make the head reach the tolerance range, there is no need to retry, but the impeller diameter turning amount shall not exceed 5% of the original diameter.
6.5 The vibration measurement method of the pump shall comply with the provisions of JB/T8097. 6.6 The noise measurement method of the pump shall comply with the provisions of JB/T8098. 7 Inspection rules
Pump inspection is divided into type inspection and factory inspection. 7.1 Type inspection
7.1.1 Type inspection should be carried out in one of the following situations: a) Trial determination and identification of new products or old products transferred to the factory for production; b) After formal production, if there are major changes in structure, materials, and processes, which may affect product performance; c) Periodic inspection of mass-produced products; d) When the product is resumed after a long period of suspension; e) When the factory inspection result is significantly different from the last inspection. 7.1.2 Inspection items shall be in accordance with the provisions of GB3216. 732
7.2 Factory inspection
7.2.1 Products produced in batches shall be inspected at the factory. 7.2.2 Inspection items shall be in accordance with the provisions of GB3216. JB/T8688—1998
7.2.3 The number of units to be inspected and the sampling rules shall be in accordance with the provisions of GB2828. 7.3 Final inspection
Each pump must be inspected by the quality inspection department of the manufacturer according to the order form. The scope of supply of the complete set shall be correct and the packing documents shall be complete. The pump can only be shipped after the product quality certificate is issued. .8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 The pump label shall be corrosion-resistant, with clear writing during the service life, and shall be firmly fixed on the pump. The content of the label includes: a) manufacturer's name;
b) pump model and name;
c) pump main parameters: flow, m/h; head, m; speed, r/min, power, kW, required cavitation margin, m; pump mass (combined pump including motor mass), kg;
d) pump factory number and date of sale.
The direction of rotation of the pump should be indicated by a firm, durable and obvious arrow in a prominent position. 8.2 Packaging, transportation and storage
8.2.1 The packaging of the product shall comply with the provisions of GB/T13384. 8.2.2 The pump shall be packed with instructions, packing list and certificate of conformity. 8.2.3 The pump shall not be inverted, dropped, knocked or exposed to rain or moisture during transportation. 8.2.4 The pump shall not be stored in the open air, exposure to the sun is strictly prohibited, the motor is strictly prohibited from being exposed to moisture, and it shall be kept away from heat sources. 9 Scope of complete sets
The manufacturer shall, according to the needs of the user, provide all or part of the following complete set supply scope and indicate it in the order form: a) Pump (coaxial pump and motor are installed together); b) Motor;
c) Coupling (coaxial pump does not have this item); d) Pump inlet and outlet pipes (pump inlet and outlet are flange type, do not have this item); e) Base (coaxial pump does not have this item);
f) Anchor bolts;
g) Wearing parts and special tools.1 The pump label should be corrosion-resistant, ensure clear writing during the service life, and be firmly fixed on the pump. The label content includes: a) Manufacturer name;
b) Pump model and name;
c) Pump main parameters: flow, m/h; head, m; speed, r/min, power, kW, required cavitation margin, m; pump mass (combined pump including motor mass), kg;
d) Pump factory number and date of sale.
The direction of rotation of the pump should be indicated in a prominent position with a firm, durable and obvious arrow. 8.2 Packaging, transportation and storage
8.2.1 The packaging of the product shall comply with the provisions of GB/T13384. 8.2.2 The pump shall be equipped with instructions, packing list and certificate of conformity when packing. 8.2.3 The pump shall not be inverted, dropped, bumped, rained or damp during transportation. 8.2.4 The pump should not be stored in the open air, and it is strictly forbidden to expose it to the sun. The motor is strictly prohibited from getting wet, and it should be kept away from heat sources. 9 Complete set scope
The manufacturer should provide all or part of the following complete set supply scope according to the needs of the user, and indicate it in the order form: a) Pump (coaxial pump and motor are installed together); b) Motor;
c) Coupling (coaxial pump does not have this item); d) Pump inlet and outlet pipes (pump inlet and outlet are flange type, there is no such item); e) Base (coaxial pump does not have this item);
f) Anchor bolts;
g) Wearing parts and special tools.1 The pump label should be corrosion-resistant, ensure clear writing during the service life, and be firmly fixed on the pump. The label content includes: a) Manufacturer name;
b) Pump model and name;
c) Pump main parameters: flow, m/h; head, m; speed, r/min, power, kW, required cavitation margin, m; pump mass (combined pump including motor mass), kg;
d) Pump factory number and date of sale.
The direction of rotation of the pump should be indicated in a prominent position with a firm, durable and obvious arrow. 8.2 Packaging, transportation and storage
8.2.1 The packaging of the product shall comply with the provisions of GB/T13384. 8.2.2 The pump shall be equipped with instructions, packing list and certificate of conformity when packing. 8.2.3 The pump shall not be inverted, dropped, bumped, rained or damp during transportation. 8.2.4 The pump should not be stored in the open air, and it is strictly forbidden to expose it to the sun. The motor is strictly prohibited from getting wet, and it should be kept away from heat sources. 9 Complete set scope
The manufacturer should provide all or part of the following complete set supply scope according to the needs of the user, and indicate it in the order form: a) Pump (coaxial pump and motor are installed together); b) Motor;
c) Coupling (coaxial pump does not have this item); d) Pump inlet and outlet pipes (pump inlet and outlet are flange type, there is no such item); e) Base (coaxial pump does not have this item);
f) Anchor bolts;
g) Wearing parts and special tools.
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