This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of small multistage centrifugal pumps. JB/T 6435.2-1992 Technical requirements for small multistage centrifugal pumps JB/T6435.2-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Small Multistage Centrifugal Pumps
Technical Conditions
1 Subject Content and Scope of Application
JB/T6435.2-92
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation, and storage of small multistage centrifugal pumps (hereinafter referred to as pumps).
This standard applies to pumps whose conveying medium is clean water or hot water below 120℃ or slightly corrosive liquids, and whose maximum suction pressure does not exceed 0.3MPa.
Referenced standards
GB1220
GB2100
GB2828
GB3216
GB3280
GB5659
GB9112
GB9439
GB10889
GB10890
Technical conditions for high-quality carbon structural steel
Stainless steel bars
Technical conditions for stainless acid-resistant steel castings
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Centrifugal pumps, mixed flow springs, axial flow springs and vortex springs test methods Stainless steel cold-rolled steel plates|| tt||Technical conditions for multistage centrifugal pumps
Types of steel pipe flanges
Gray iron castings
Methods for measuring and evaluating vibration of pumps
Methods for measuring and evaluating noise of pumps
GB/T13306 Labels
GB/T13384
JB/T4297
General technical conditions for packaging of electromechanical products
Technical conditions for coating of pump products
Types and basic parameters
JB/T6435.1 Small multistage centrifugal pumps
3 Technical requirements
The pump shall comply with the provisions of this standard and be manufactured according to the product drawings and technical documents approved through the prescribed procedures. If the user has requirements for the product that are different from those of this standard, they may be manufactured according to the provisions of the technical agreement or order form. 3.1 Product performance
3.1.1 The performance parameters of the pump shall comply with the provisions of JB/T6435.1 or the contract. The performance deviation of the pump shall comply with the provisions of GB3216C.
3.1.2 The pump manufacturer shall determine the allowable operating range of the product and draw a performance curve (head, efficiency, shaft power, required NPSH and flow rate relationship curve).
3.1.3 When the pump is operating within the allowable operating range, measure the vibration intensity, and its limit value shall comply with the provisions of GB10889. 3.1.4 When the pump is operating within the allowable operating range, measure the noise, and its limit value shall comply with the provisions of GB10890. 3.2 Structural designwww.bzxz.net
3.2.1 Prime mover
Approved by the Ministry of Machinery and Electronics Industry on July 20, 1992 and implemented on January 1, 1993
JB/T6435.292
The power of the prime mover shall be at least 1.2 to 1.4 times the shaft power of the pump at the specified point. If it is less than 4kW, take the larger value; if it is more than 4kW, take the smaller value. 3.2.2 Critical speed
The operating speed of the pump must be less than the first critical speed under the condition of rigid shaft, and should be n<0.8n; under the condition of flexible shaft, it must be greater than the first critical speed and less than the second critical speed. It should be 1.4ne
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