Pipeline centrifugal pumps shall comply with the requirements of this standard and shall be manufactured according to the product drawings and technical documents approved by the prescribed procedures. Centrifugal pumps shall be capable of continuous normal operation under the following conditions of use (or water quality specified in GB 5084): a) Not exceed 80 ℃; b) the pH of the medium is 6.5-8.5; c) the volume ratio of solid impurities in the medium does not exceed. .1%, particle size is not greater than. The manufacturer shall give the performance curve (lift, efficiency, shaft power, NPSH versus flow rate) for each pump. The operating range of the pump is recommended as 0.7Q. A 1. 2Q, (Q., for the prescribed point of traffic). Performance and tolerances Pump performance deviations should be consistent with GB / T 3216-2005 Level 2 requirements. Pump vibration intensity should be consistent with the provisions of C / JB / T 8097-1999 class C. Pump noise level should be consistent with the provisions of JB / T 8098-1999 Class C. Pumps NIB required margin deviation. Deviations should be consistent with the provisions of GB / T 13006. Nominal pressure of inlet and outlet flanges of centrifugal pipe of structure pipe: 0.6 MPa when pump head is less than or equal to 50 m and 1.6 MPa when pump head is greater than 50 m. The connection of flange should conform to GB / T 17241. 6 provisions. The pump body should be set drainage holes, exhaust holes and inlet and outlet flange pressure-measuring holes, drainage holes and exhaust holes should be conducive to draining the pump exhaust liquid and accumulate air. Pump body should also be set diversion hole or water cup, diversion hole can be used for exhaust holes. Shaft should be installed retaining ring to prevent water into the bearings. The use of soft packing should be added bushing, bushing should be securely fixed on the shaft, and with the shaft rotation. For slowdown pumps, when the head is lower than 12.5 m, the balance hole and the back seal ring may not be provided. Depending on the use of the environment and the requirements of different power packages, the structure of the pump can be different, but the provisions of the pump performance, efficiency and NPSH should be consistent with the provisions of this standard. Pipeline centrifugal pump seal shaft seal can be mechanical seal, rubber seal or soft rubber seal, shaft seal cavity size should be consistent with the provisions of GB / T 5661's. The use of soft packing seal or skeleton rubber seal, the shaft should be supporting bushing, bushing surface scratches, rust and other defects. Bearings and lubrication using deep groove ball bearings should be consistent with the provisions of GB / T 276; other bearings should be consistent with the corresponding standards. The use of the bearing temperature can not be ignored environmental irrigation degree 40 ℃. Maximum working temperature shall not recruit 80 ℃. Bearings can be greased or thin oil lubrication. Coupling or pulley pipe centrifugal pump through the elastic coupling or pulley driven by the power machine, flexible coupling installation accuracy not less than the manufacturer or the relevant provisions of the standard. The coupling halves or pulleys shall be securely fixed to the shaft without generating axial and circumferential movement relative to the shaft. When the pump through the coupling directly driven with the motor or through the pulley driven by the prime mover, should be set protective plate .Pipeline centrifugal pump base seat and installation dimensions should be consistent with GB / T 566. The provisions of the pump and power machine with a belt drive without base material requirements of the main pump cast iron parts should be consistent with the provisions of JB / T 6880. 1-6880.3. High-quality carbon structural steel shall comply with the provisions of GB / T 6 "stainless steel parts should be consistent with the provisions of GB / T 1220. Alloy steel parts should be consistent with the provisions of GB / T 3077. Impellers, couplings and pulleys and other rotation Parts to withstand the pressure on the parts of the pump to withstand the work pressure of the parts should be water (or gas) pressure test without leakage, sweating and other phenomena, the test pressure of 1.5 times the working pressure (but not less than .2 MYa) for 5 min, assembly and appearance requirements All components must be tested and qualified (external components, purchased parts, standard parts should have the most qualified certificate) can be assembled. , Rotating parts should be smooth and flexible rotation, without rubbing, jamming and other phenomena exposed mechanical surface should be taken anti-rust measures. The fastener may not be loose phenomenon. The outer surface of the pump should be no pollution, bumps, corrosion Etc .. Pump paint should be consistent with the provisions of JB / T 5673. Pump should have obvious signs of red rotation direction, and should ensure that the mark is not easy to wear out during use. Pump inlet and outlet should be sealed to prevent debris from entering Pumps - Safety Requirements for pump safety With the provisions of GB 10395.8 Pump safety signs should be consistent with the provisions of GB 10396. Reliability Under the conditions of use, the average working time before the pipeline centrifugal pump failure for the first time should not be less than 5000h.For the reliability test, In addition to the manufacturer's requirements for maintenance, and according to the provisions of the time to replace wearing parts, does not allow replacement of other parts
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