This standard specifies the material hygiene requirements and design and manufacturing requirements for centrifugal and rotor type milk and dairy product pumps. This standard applies to centrifugal and rotor type milk and dairy product pumps. QB 1674-1992 Hygienic requirements for centrifugal and rotor type milk and dairy product pumps QB1674-1992 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Centrifugal and rotor type
Hygiene requirements for milk and dairy product pumps
1 Subject content and scope of application
QB 1674-1992
This standard specifies the material hygiene requirements and design and manufacturing requirements for centrifugal and rotor type milk and dairy product pumps. This standard applies to centrifugal and rotor type milk and dairy product pumps. 2 Reference standards
GB/T3280 Stainless steel cold-rolled steel plate
GB4807 Hygiene standard for rubber gaskets (rings) for food GB12073 Safety and sanitation of dairy equipment
GBn84～89 Hygiene standard for plastic moldings
3 Terminology
3.1 Dairy: milk and dairy products.
3.2 Dairy contact surface: all surfaces that are in direct contact with dairy products, as well as surfaces from which emulsion leaks, drips or is adsorbed into dairy products. 3.3 Non-dairy contact surfaces: All other exposed surfaces. 4 Materials and their hygienic requirements
4.1 Metal materials
4.1.1 Stainless steel: Used to manufacture dairy contact surfaces, such as impellers or rotors, pump casings, delivery pipes, etc. Austenitic stainless steel specified in GB/T3280 or other stainless steels with similar corrosion resistance to the above materials should be used. Materials that may rust after welding shall not be used as equipment surfaces in contact with liquid products. Stainless steel materials should be non-toxic and non-absorbent. 4.1.2 Other steels: Used to manufacture non-dairy contact surfaces, such as brackets and bases, and should meet the strength requirements under the conditions of use. In order to improve their corrosion resistance, they should be treated with electroplating, painting, etc. 4.2 Non-metallic materials
4.2.1 Plastics and rubber: Can be used to manufacture elastic joints, O-type gaskets, sealing rings, etc. Rubber parts with dairy contact surfaces shall meet the requirements of GB4807, be relatively stable in the working environment, be oil resistant, withstand normal cleaning and sterilization, be easy to clean, insoluble, non-toxic, and non-absorbent. Plastic parts with dairy contact surfaces shall meet the requirements of GBn8489, be non-toxic, wear resistant, and relatively stable under working conditions.
4.2.2 Graphite and ceramics: used to manufacture rotary seals, etc. Graphite and ceramic materials should be inert, non-leakage, non-toxic, non-adsorbent, insoluble, wear resistant, and resistant to deformation when in the expected use environment or in the working conditions of cleaning and sterilization. 4.3 In pump structures designed for thermal sterilization systems and for operation at temperatures of 121°C or higher, all materials with dairy contact surfaces shall be such that: www.bzxz.net
can be sterilized with saturated steam or pressurized water at a temperature of at least 121°C; Approved by the Ministry of Light Industry of the People's Republic of China on January 15, 1993 104
Implementation on September 1, 1993
QB 1674—1992
b. can operate at the temperature required for sterilization. 5 Design and manufacturing requirements
5.1 Surface roughness
The surface roughness shall comply with the provisions of Article 5.1 of GB 12073. 5.2 Grooves, corners and fillet radii
5.2.1 Sealing gaskets with dairy contact surfaces shall be removable. The width of any gasket flange shall not be less than the depth. Where the installation position permits, the width of the groove shall not be less than 6.5 mm. 5.2.2 All internal angles below 135° on the dairy contact surface shall be processed into fillets with a minimum fillet radius of 6.5mm, except for the following cases:
a. The minimum fillet radius of the groove for the standard O-ring with a cross-sectional diameter of 7mm shall not be less than 2.4mm, and the minimum fillet radius of the groove for the standard O-ring with a cross-sectional diameter of 3.55mm shall not be less than 0.8mm; b. The minimum fillet radius of the groove for the standard O-ring with a cross-sectional diameter of more than 7mm shall not be less than 3.2mm; c. Due to functional requirements, the parts with a fillet radius of less than 0.8mm shall be easy to access and convenient for manual cleaning and inspection. 5.3 All joints on the dairy contact surface shall be smooth, permanent joints shall be welded without interruption, welds shall be smooth and without pits, and the R value shall not be greater than 3.2μm after sandblasting or polishing. The welds on non-dairy contact surfaces shall be smooth, continuous and without pits. 5.4 All dairy contact surfaces should be easy to clean. Parts that are not easy to clean automatically and contact with dairy products should be easy to disassemble for cleaning. 5.5 Non-dairy contact surfaces should be smooth, without pits and cracks, and easy to clean. 5.6 Except for the use of threads to install the impeller on the shaft, there should be no threads on the dairy contact surface. 5.7 The shaft seal of the pump should adopt a packingless sealing device. 5.8 For all elastics that come into contact with dairy products, when they are in a free state, the distance between each circle (including both ends) should be at least 2.4mm. 5.9 Any bearing that comes into contact with dairy products should be non-lubricated. If lubricated bearings must pass through the dairy contact surface or may contaminate dairy products, devices must be designed around the bearings to prevent contamination. 5.10 Pumps that work under high temperature conditions above 121°C should ensure safe operation under this condition without leakage, ensure that the pipe connections at the inlet and outlet can be safely locked, and will not automatically shut down when the internal pressure is lower than atmospheric pressure. 5.11 The pump shall be supported by one of the following methods: 5.11.1 Using legs: The corners of the legs shall be rounded and shall not have exposed threads. The legs made of pipe shall be closed at the bottom and shall be long enough to allow a certain clearance between the base of the equipment, the lowest part of the pump, motor or transmission and the ground. This clearance shall not be less than 110 mm.
5.11.2 Mounted on the transmission.
5.11.3 Fixed on a thick pad or base. The size of the thick pad or base shall be at least 25 mm smaller than the size of the pump in all horizontal directions. The height of the thick pad or base shall ensure that the distance between the top of the pump base and the ground is not less than 150 mm. The pump base shall be welded to the mounting surface and the joints shall be sealed.
5.12 The motor, pump and transmission shall be installed in a reasonable position so that all non-dairy contact surfaces are easy to clean. 5.13 Ensure that any protective device cannot be removed by hand. 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 Dairy Machinery Standardization Center. This standard was drafted by Shanghai Qianwei Machinery Factory. The main drafters of this standard are Wang Wufang, Shi Lianguan and Shen Peihua. 105
Industrial Resources New Office
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