This standard applies to single-stage single-suction water centrifugal pump.
The maximum working pressure of the pump is not more than 16bar *. Inhalation pressure is not more than 3bar. (* 1bar = 0.1MPa.)
Liquid temperature 0 to 80 ° C.
The transport liquid should not contain solid impurities in excess of 0.1% by volume and with particle size greater than 0.2 mm.
1 Terms
1.1 Permissible operating range Pump impeller installed in the provisions of the use of the flow range. This range is subject to cavitation, heat, vibration, noise, shaft deflection, and other similar conditions and is specified by the manufacturer.
1.2 prime mover rated output power (output)
The prime mover rated output power is hidden content of the post need to reply before they can view the maximum allowable prime mover output power (output) under the working conditions in the field.
1.3 Working pressure Working pressure refers to the pump within the allowable working range, including suction pressure discharge pressure.
1.4 First Critical Speed ​​Rotation Zero (part) The machine speed at which the first (lowest) transverse natural frequency coincides with the rotation frequency.
1.5 Deflection of Shaft The deflection of the shaft refers to the amount of displacement that occurs when the hydraulic radial force acting on the impeller causes the shaft to deviate from its geometric center. Shaft deflection does not include shaft displacement due to tilting in the bearing clearance and shaft displacement due to bowing caused by unbalanced impeller or radial runout of the shaft.
2 technical requirements
2.1 pump performance
2.1.1 Pump performance and size should be consistent with GB5662-85 "axial suction centrifugal pump (16bar) markings, performance and size" or other technical standards.
2.1.2 The pump manufacturer shall determine the permissible operating range of the product and its variants and plot the performance curves (head, efficiency, shaft power, NPSH, etc.) against the flow rate.
2.2 Efficiency The efficiency of the pump should not be lower than JB3559-84 "single-stage centrifugal pump efficiency" requirement.
2.3 NPSH
Pumping NPS surplus should not exceed JB3562-84 "Centrifugal pump, mixed flow pump and axial pump NPSH" requirement.
2.4 The prime mover to determine the rated output power of the prime mover must be considered within the allowable working range. The capacity of the prime mover is selected as shown below.
2.5 Critical speed Under operating conditions, the actual first critical speed of the rotor should be at least 10% of the maximum permissible continuous operating speed.
2.6 Balance and vibration Pump rotating parts should be balanced. Vibration shall not exceed the vibration severity limits given in Table 1 when measured at the manufacturer's test equipment. Vibration severity is measured radially outside the bearing at one operating point of rated speed (± 5%) and rated flow (± 5%) when operating without cavitation. This value is usually achieved using the G6.3 balance of Appendix A (Supplement).
Table 1 with multi-vane impeller horizontal pump vibration intensity limit
Note: This table according to see Appendix B (Supplement)
2.7 Pressure parts
2.7.1 Wall thickness The internal pressure housing, including the shaft seal body and packing gland (or mechanical seal end cap), should be of such thickness that they can withstand the pressure and limit the deformation.
2.7.2 Flange inlet flange and flange outlet should be consistent with GB4216-84 "gray cast iron pipe flange size and gasket" requirement.
2.7.3 The pump body should be set on the pump body drain holes, irrigation holes and inlet and outlet flange pressure measurement hole. The threaded holes are non-threaded pipe thread seal, see Appendix C (Supplement).
2.8 shaft seal
2.8.1 Shaft seal cavity design dimensions should be consistent with GB5661-85 "axial suction centrifugal pump mechanical seal and soft packing cavity size" requirement.
2.8.2 Design should minimize the pressure seal shaft cavity can be set after the balance ring and the hole and so on.
2.8.3 The shaft seal chamber shall be fitted with a packing ring for the injection of coolant or sealing fluid into the packing.
2.8.4 The number of packing should be not less than 4 laps, when the packing is loose, the packing gland should be able to work reliably (that is, no phenomenon such as loose studs).
2.8.5 Pump overall structure design should ensure that there is sufficient space for packing.
2.8.6 Bolts or studs with externally bolted pressure-containing parts (including pump body, pump cover, packing, gland) shall, in principle, be at least 12 mm in diameter.
2.9 impeller
2.9.1 impeller is closed, the entrance of the blade should be round head.
2.9.2 impeller should be firmly fixed to prevent the circumferential direction and axial movement. Impeller hub length should be not less than 1.2 times the aperture.
2.10 seal ring
2.10.1 The seal ring should be securely attached to the pump body.
2.10.2 Seal ring and impeller running clearance should be selected according to Table 2.
2.11 Shafts and bushings
2.11.1 Shafts shall have sufficient strength and rigidity to ensure reliable pump operation. During pump operation, the deflection of the outer shaft of the stuffing box should not exceed 50 μm due to radial loads. Bearing deformation should not be taken into account when calculating shaft deformation. The necessary rigidity of the shaft can be achieved by a combination of shaft diameter, bearing span or cantilever length, and pump body design (eg, double volute housing).
2.11.2 thread on the axis of rotation, the shaft rotation, the nut should be tightened, the shaft should retain the center hole.
2.11.3 The shaft section corresponding to the position of the stuffing box can be protected by a bushing, which the bushing should be securely fastened to the shaft. When installing a soft packing or a mechanical seal, the sleeve should extend beyond the packing gland or mechanical seal end cap.
2.11.4 shaft surface is not allowed to have hair lines, crushing and other defects.
2.11.5 shaft should be used retaining ring or waterproof disk and other appropriate methods to prevent water into the bearings.
2.12 bearings
2.12.1 using GB276-82 "radial ball bearings dimensions." Bearings with thin oil or dry oil lubrication.
2.12.2 The bearing body and all the holes or gaps communicating with the outside in normal operating conditions, should be able to prevent the entry of dust and pumping liquid and lubricant leakage. Bearings with thin oil lubrication, the bearing body to be set at the bottom of the oil drain plug, the upper part of the bearing body to be set to deflate the plug. The oil level should be constant, use the oil cup or oil mark displayed. Dry oil lubrication, the bearing body is not set in principle dry oil replenishment hole.
2.12.3 bearing temperature shall not exceed the ambient temperature 40 ° C, the maximum bearing temperature shall not exceed 80 ° C.
2.13 coupling
2.13.1 Couplings generally adopt flexible couplings. The couplings should be selected to transmit the maximum torque with power, and the coupling speed should be matched with the power speed.
2.13.2 Flange type elastic couplings shall be machined and assembled to a precision not exceeding the limit given by the manufacturer.
2.13.3 The coupling guard should cover all the rotating parts of the coupling.
2.14 base
2.14.1 The foundation shall be rigid enough to ensure that the concentricity of the two couplings of the pump and prime mover does not exceed the limits given by the pump manufacturer.
2.14.2 The base can be cast iron or steel welded structure, if necessary, can be set in its diameter of not less than 100mm or an area of ​​equivalent grouting holes.
2.14.3 base and installation dimensions should be consistent with GB5660-85 "axial suction centrifugal pump base size and installation dimensions" requirement.
2.15 quality castings of the pump Castings quality of the pump should be consistent with the provisions of JB / TQ367-84 "pump cast iron technical conditions". Welding defects can be repaired in accordance with JB / TQ369-84 "pump cast iron welding repair" to repair.
2.16 assembly basic requirements
2.16.1 The pump should be very smooth when turning the rotor after assembly.
2.16.2 The pump is to be rust-proofed and painted as follows before assembly:
a. runner surface is not processed, cast iron coated with anti-rust paint;
b. bearing oil storage room surface should be cleaned up, coated with oil enamel;
c. Shaft, coupling, bushings and other processing surface application of grease or other anti-rust coating.
2.16.3 bearing body oil leakage is not allowed.
2.16.4 The exterior of the pump and common base should be trimmed.
3 material
3.1 Materials Standard pump materials should meet the following standards:
a.GB 976-67 "gray iron casting classification and technical conditions";
b.GB 699-65 "High-quality carbon structural steel things and general technical conditions";
c.GB 700-79 "Common carbon structural steel technical conditions."
3.2 pump material selection Pump main parts recommended selection of materials in Table 3. If the user requests materials other than this form, the supplier and the buyer will discuss otherwise.
4 test methods and inspection rules
4.1 Materials Testing Materials testing shall comply with the provisions of 3.1.
4.2 hydrostatic pressure test pressure parts should be carried out 1.5 times the working pressure of the hydraulic strength test, but the maximum does not exceed 24bar. Test water at room temperature, the pressure lasted 5min, pressure parts may not have leakage and other defects.
4.3 type test or factory test
4.3.1 For any one of the following circumstances, the type test or factory test must be carried out:
a. New product trial should be all type test;
b. Due to design or process changes, causing some changes in the characteristics, the full type test should be carried out;
c. Mass production of products, generally in accordance with the provisions of the proportion of Table 4 type test and factory test; test unqualified products according to the nature of the problem decided to double test or all the tests.
Table 4
Note: The number of type test stations included in the number of factory test.
4.3.2 Test methods and performance deviations, test accuracy should be consistent with GB 3216-82 "centrifugal pump, mixed flow pump, axial flow pump and vortex pump test method" C-class precision requirements. When the measured performance point is higher than the specified performance point is judged to be unqualified, if only for the purpose of turning the impeller diameter so that the lift to reach the tolerance range, do not have to retry; but impeller diameter turning amount of not more than 5% of the original diameter, .
4.4 test before and after the pump coating
4.4.1 Pumps and their parts Before the test and inspection in addition to rust primer, should not paint other paint.
4.4.2 pump after passing the performance test should be in addition to the net water pump, and the following factory coating treatment:
a. Internal processing surface coated with anti-rust grease;
b. Exposed surface coated hardened anti-rust oil;
c. External rust and oil should be removed and primed and painted, and putty should be applied when needed.
4.4.3 After anti-rust treatment and surface coating, the pump inlet and outlet should be sealed.
4.5 Field Test Factory due to equipment conditions can not be tested, the user should test, the specific test methods agreed by the manufacturer and user.
4.6 Final Inspection Every pump shall be inspected by the manufacturer's technical inspection department in accordance with the product's delivery, the completeness of the complete range and the completeness of the packing information. The product shall be shipped after the product quality certificate is issued.
5 logo, packaging, shipping and storage
5.1 mark
5.1.1 signage Pump signage should be corrosion-resistant, to ensure that the use of period clear writing; to be firmly fixed on the pump, the signage should include:
a. the name of the manufacturer
b. pump name and model;
Pump specifications: flow (m3 / h), head (m), speed (r / min), with the power (kW), pump NPS (m), pump weight
d. Pump's serial number and date of manufacture.
5.1.2 Direction of rotation The direction of rotation of the pump should be in a prominent position, with a well-marked arrow.
5.2 Packaging and shipping
5.2.1 product packaging by JB2759-80 "General Mechanical and Electrical Products Packaging" implementation.
5.2.2 Measures should be taken to avoid bearing damage caused by vibration and collision during transportation.
5.3 Packing Information Each pump should be shipped with the following packing information and installed in a waterproof, moisture-proof document bag;
a. product certificate of conformity
b. packing list (including: a complete assembly of pumps, motors, special tools for removal, the necessary spare parts and accessories and packing details, etc.);
c. Manual (including: structure, installation, instructions for use, pump performance curve, etc.), the overall plan, installation dimensions and major consumable plans.
5.4 Storage pump should be stored in the storage to prevent corrosion and damage, the pump seal is valid for 12 months, due inspection should be re-sealed.
6 sets of scope and assurance issues
6.1 Complete Range Users may order all or part of the following set of supply ranges as required and specify in the purchase order:
a. pump
b. prime mover
c. Couplings and shields;
d. common base
e. anchor bolts
f. Necessary wearing parts and accessories (such as gate valve, check valve, bottom valve, filter, discharge cone, etc.);
g. Assembly and disassembly of the special tools needed.
6.2 Guarantees In the user selection of products appropriate and comply with the custody and use of the rules of the conditions, from the manufacturer shipped within 18 months from the date of continuous operation of not more than 12 months, due to poor manufacturing quality of products damaged and can not work properly , The manufacturer should be responsible for the replacement of users for free, repair products or parts, but the normal wear and tear of parts not included.
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