JB/T 51032-1999 Light and small single-stage centrifugal pump product quality classification
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T51032-1999
Quality Classification of Light and Small Single-stage Centrifugal Pumps (Internal Use)
Published on December 30, 1999
National Bureau of Machinery Industry
Implementation on June 1, 2000
JB/T51032-1999
This standard is a revision of JB/T51032-93 "Quality Classification of Light and Small Single-stage Centrifugal Pumps". Compared with JB/T51032-93, the main technical content of this standard has been changed as follows: - The relevant content of "cleanliness" has been deleted; - The content of "safety requirements" has been supplemented
- The classification of unqualified items has been adjusted. This standard replaces JB/T51032-93 from the date of implementation. This standard is proposed and managed by the National Agricultural Machinery Standardization Technical Committee. The responsible drafting units of this standard are: China Agricultural Mechanization Science Research Institute, Hunan Agricultural Machinery Research Institute, Zhejiang Electromechanical Design Institute.
The main drafters of this standard are: Zhang Xiansheng, Li Zhipeng, Pei Yi, Zhang Mingguang, Shao Wen'e. 1 Scope
Machinery Industry Standard of the People's Republic of China
Quality Classification of Light and Small Single-stage Centrifugal Pumps (Internal Use)
JB/T51032-1999
Replaces JB/T5103293
This standard specifies the quality indicators, test methods and inspection rules of light and small single-stage centrifugal pumps. This standard applies to light and small single-stage centrifugal pumps (hereinafter referred to as pumps). 2 Referenced 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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2828—1987
GB/T3216—1989
GB10395.8—1999
JB/T5673—1991
JB/T6663.1—1993
JB/T6663.2—1993
JB/T8097—1999
JB/T8098—1999
3 Product quality grade
1 General requirements
Batch inspection Check the counting sampling procedure and sampling table (applicable to the inspection of continuous batches) Test methods for centrifugal pumps, mixed flow pumps, axial flow pumps, and vortex pumps Safety technical requirements for agricultural and forestry tractors and machinery Part 8: Irrigation and drainage pumps and pump units General technical conditions for painting agricultural and forestry tractors and machinery Types and basic parameters of light and small single-stage centrifugal pumps Technical conditions for light and small single-stage centrifugal pumps
Vibration measurement and evaluation methods for pumps
Noise measurement and evaluation methods for pumps
Pumps should be manufactured according to product drawings and technical documents approved through prescribed procedures and comply with the provisions of relevant standards. 3.2 Grade categories
According to the technical level and quality level of pump products, they are divided into qualified products, first-class products and superior products. 3.3 Grading indicators
3.3.1 The performance of pump products shall comply with the provisions of Table 1. 3.3.1.1 Deviation of pump head and flow rate: qualified products shall comply with the C-level regulations in GB/T3216-1989; first-class and superior products shall comply with the B-level regulations in GB/T3216-1989.
3.3.1.2 The efficiency of the pump at the specified point shall not have a lower deviation. 3.3.1.3 Deviation of the NPSH (NPSH) c at the specified point of the pump: qualified products shall comply with the C-level regulations in GB/3216-1989; first-class products shall comply with the B-level regulations in GB/T3216-1989, and superior products shall not have an upper deviation. 3.3.1.4 Vibration of the pump when working within the allowable working range: qualified products shall comply with the C-level regulations in JB/T8097-1999; first-class and superior products shall comply with the B-level regulations in JB/T8097-1999. 3.3.1.5 Noise of the pump when working within the allowable working range: qualified products shall comply with the requirements of Class C in JBT8098-1999, first-class products and JB/T51032-1999 approved by the State Machinery Industry Bureau on December 30, 2000 and implemented on June 1, 2000, superior products shall comply with the requirements of Class B in JB/T8098-1999. Table 1
Should comply with the provisions of JB/T6663.1
3.3.2 Reliability
Qualified products
Should be greater than or equal to
0.95 times the efficiency value specified in JB/T66631
Efficiency%
First-class products
Should be greater than
JBT6663.1
Efficiency value specified
Superior products
should be greater than the efficiency value specified in JB/T66631
plus one hundred
matching power
critical cavitation
margin m
should comply with the provisions of JB/T6663.1
under the specified conditions of use, the average working time before the first failure of the pump: qualified products should be no less than 1500h; first-class products should be no less than 2000h, and superior products should be no less than 3000h. 3.3.3 Assembly quality
The assembly should be correct and complete. When the assembled pump is not filled with stuffing, the rotating rotor should be stable and flexible, without sticking, collision and other phenomena. 3.3.4 Appearance quality
Adhesion
The sign should be firmly fixed on the pump, and the content should be correct, complete, and the handwriting should be clear. The pump should have obvious steering signs. The surface quality of the pump should comply with the provisions of Table 2. Table 2
Qualified products
The paint coating should be uniform in color, smooth, without exposed bottom, bubbles and obvious wrinkles. The outer surface of the product should not have obvious unevenness
Inspect three places, at least two places should be Grade 2
3.3.5 Safety requirements
Superior products
(1) The paint coating should be bright in color, smooth and flat, without exposed bottom, spots, flow marks, bubbles and wrinkles. (2) The surface of the casting should be flat and bright, and the metal coating and oxidation treatment layer should not peel off or rust. (3) Defects such as bumps and dents are not allowed
Inspect three places, all should be Grade 2 and above
Safety requirements should comply with the provisions of GB10395.8. 3.3.6 Bearing temperature rise
Bearing temperature rise shall comply with the provisions of 3.5.2 of JB/T6663.2-1993. 3.3.7 Packaging quality
Packaging and its marking shall comply with the relevant provisions of JB/T6663.2. 3.3.8 Manufacturing quality of main parts
Check three places, at least two places of grade one or above, one place of grade two or above
3.3.8.1 Pump body, pump cover and other pressure-bearing parts shall be subjected to water (air) pressure test, and their quality shall comply with the provisions of 3.12 of JB/T6663.2-1993.
3.3.8.2 Rotating parts such as pump impeller shall be subjected to static balance test, and their allowable unbalanced mass shall comply with the provisions of 3.11 of JB/T6663.2-1993. 2
4 Test methods
4.1 General requirements
JB/T51032-1999
4.1.1 Test liquids, test environment and site conditions shall comply with the provisions of relevant standards. 4.1.2 Test equipment, devices, instruments and meters shall be selected in accordance with the provisions of relevant standards and have valid verification reports. 4.1.3 During product inspection and testing, the accuracy and reliability of each test data must be guaranteed. If an abnormality is found, the cause should be found out in time and necessary treatment should be taken.
4.1.4 Test equipment, instruments and meters shall meet the measurement requirements and shall be checked and calibrated before the test. 4.2 Pump performance test
4.2.1 The measurement of pump flow, head, efficiency and critical cavitation margin shall be carried out in accordance with the provisions of GB/T3216. 4.2.2 The measurement of pump noise shall be carried out in accordance with the provisions of JB/T8098. 4.2.3 The vibration of the pump shall be measured in accordance with the provisions of JB/T8097. 4.3 Bearing temperature rise
The pump shall run continuously for at least 30 minutes at the specified speed and working range operating point, and the bearing temperature rise shall be measured. 4.4 Reliability test
The manufacturer or inspection department shall measure the average working time before the first failure of the pump under the test conditions specified by the test base or the user, and the number of test pumps shall be at least 3, and a reliability test report shall be formed. 4.5 Inspection of safety requirementswwW.bzxz.Net
It shall be carried out in accordance with the provisions of GB10395.8.
4.6 Inspection of assembly quality
Turn the rotor parts of the assembled pump (without packing) to observe whether the operation is smooth and flexible, and whether there is any jamming, collision, etc. 4.7 Inspection of appearance quality
4.7.1 Observe whether the label is firm, whether the content is correct and complete, and whether the handwriting is clear. Does the pump have obvious turning signs? 4.7.2 The appearance quality of the pump surface is visually inspected and counted. 4.7.3 The inspection of the adhesion of the paint coating shall be carried out in accordance with the provisions of JB/T5673. 4.8 Inspection of packaging quality
The packaging and its markings are self-tested and counted to observe whether the packaging markings are complete and clear, and whether the random documents, accessories and tools are complete and correct.
4.9 Inspection of the manufacturing quality of major components
4.9.1 Water (gas) pressure test: Apply a test pressure of 1.5 times the working pressure to the pressure-bearing parts of the pump for at least 5 minutes, and observe whether there is leakage during the pressure.
4.9.2 The static balance test of rotating parts such as impellers should be carried out on a balancing machine or balancing equipment. 5 Inspection rules
5.1 General requirements
Pumps should be sampled and judged according to the sampling inspection and judgment disposal principles specified in GB/T2828 and the provisions of this standard. 5.2 Inspection items are shown in Table 3.
5.3 Unqualified classification
JB/T51032—1999
Any inspected item that does not meet the provisions of this standard is considered unqualified. According to the degree of influence on product quality, it is divided into three categories of A, B, and C. The classification of unqualified items is shown in Table 3. Table 3
Classification of non-conformities
Class A non-conformities
Class B non-conformities
Class C non-conformities
5.4 Sampling rules
Safety requirements
Specified flow and head
Specified efficiency
Specified critical NPSH
Bearing temperature rise
Average working time before first failure
Water (gas) pressure test
Static balance
Assembly quality
Signage and steering
Appearance quality
Paint coating adhesion
Inspection items
5.4.1 The sampling inspection procedure shall be in accordance with the provisions of GB/T2828, and the normal inspection one-time sampling plan shall be adopted. The sampling plan is shown in Table 3. In the table, S-1 is the special inspection level, AQL is the qualified quality level, Ac is the qualified judgment number, and Re is the unqualified judgment number. 5.4.2 Random sampling is adopted, and the sampled samples should be products produced by the factory within the past six months. The sampling batch should be no less than 10 units, which is not limited when sampling by the sales department or the user. 5.4.3 The sample can be drawn from the finished product warehouse, or from the sales department or the user, and the sample is sealed and sent to the designated unit for inspection and testing. Qualified product samples can be drawn from the company's finished parts warehouse or production assembly line. After qualified on-site assembly and debugging, the sample is sealed and sent to the designated unit for inspection and testing.
5.4.4 The sample should be a qualified product of the corresponding grade, and the sample size is 2 units. 5.4.5 Sampling can be rejected when the sampling conditions do not meet the requirements. 5.5 Judgment rules
JB/T51032-1999
Adopt item-by-item assessment, and the lowest level of each type of non-conformity in Table 4 is determined as the product gradeTable 4
Non-conformity classification
Sample size n
Number of items
Inspection level
Sample code
Qualified products
First-class products
Superior products
Note: When the sample size changes,
Ac and Re are selected according to Table 3 in GB/T2828-1987. AQL remains unchanged,
Republic
Mechanical Industry Standard
Light and small single-stage centrifugal pump product quality classification (internal use)
JB/T510B2-1999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing, Postal Code 100044)*
Format 880×12301/16 Printing sheet 1/2
2 Number of words 12000
First edition in April 2000
First printing in April 2000
Print number 1-500
Price 1000 yuan
No. 99-1408
Mechanical Industry Standard Service Network: http:/hvwwJB.ac.cn6661201 /
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