US chemical pump commonly used standard ASME B73 (foreign trade essential) American chemical pump standard ASME B73 is the American Society of Mechanical Engineering (ASME) compiled a set of important standards, since 1962 as the standard of volunteers after the publication of several amendments. Detailed and detailed provisions, the data is accurate and reliable. Now it has been widely accepted by foreign chemical process pump manufacturing industry and become an important technical document based on chemical pump design, manufacturing procurement and trade negotiations. ASMEB73.3 is a metal seal pump standard. Pump limited to horizontal, end suction (axial inhalation type). This standard refers to the sealless pump includes: shielded motor pump (CMP, hereinafter referred to as "shielded pump") and magnetic drive pump (MDP, hereinafter referred to as "magnetic pump"). I. CLASSIFICATION 1.1 Shielded Pumps (CMP) In a sealed housing, there is a pump section and a motor section. The pump and the motor have a common shaft that circulates the pumped liquid through the gap between the stator and rotor of the motor. Motor stator, rotor respectively with a corrosion-resistant isolation sleeve (also known as shielding sleeve) closed up. Since the rotating part is completely enclosed in a one-piece housing, no drive shaft penetrates the pump housing and thus no moving parts are sealed, completely eliminating leakage. 1.2 Magnetically driven pump (MDP) This pump utilizes a permanent magnet or electromagnet outer ring through a corrosion-resistant isolation sleeve to drive the two inner rotor components, the rotor components from the impeller, shaft and inner drive components (inner magnetic Ring). Second, the pressure limit 2.1 Hydrostatic pressure test pressure vessels should undergo at least 1.5 times the maximum design pressure of the hydrostatic test, and should have the ability to withstand the vacuum of 760 mm Hg column. The limit liquid temperature at the pump inlet flange should be specified by the pump manufacturer. Pump applications consider the properties of liquids such as specific heat and saturated steam pressure. Third, a number of design features 3.1 Removal of the pump rotor should be removed from the rear of the pump housing (that is, "back door" type), without the need to dismantle the inlet and outlet pipelines or drivers. Driven by a separate coupling, the drive has a leg-mounted magnetic pump unit that should also be able to disassemble the rotor without affecting the drive unit. Flange should have demolition screw holes. 3.2 jacket (heating or cooling chamber) heating or cooling jacket as needed, the jacket should be 170 especially below the minimum press 690kPa to design. Seal jacketed for motor cooling Designed for a minimum pressure rating of 345 kPa 3.3 Pad All pads should be restrained on the atmosphere side to prevent air leakage. 3.4 Hole marking All openings in the pump shall have the following uniform markings as follows: Symbol - Use I - Pump discharge hole n - Outlet pressure gauge or flush fitting a - Inlet pressure gauge or flush fitting IV - Isolation Set drain hole V - Return flushing temperature and outlet IX - Isolation sleeve Flushing population hole X - Oil drain hole XI - Holder cooling water hole VI - Spacer temperature hole M - Frame connector: Top Ml - rack connector: discharge hole Fourth, the internal drive components 4.1 Magnetic components (ie, the inner magnetic) should be rigidly fixed on the impeller drive shaft. 4.2 Bearing Design Bearing system should be able to absorb the forward and reverse thrust and radial load. Bearing design should consider the fluid characteristics, unit load, corrosion, erosion, heat exchange, with the friction characteristics. 4.3 Clearances The material used for the shaft bushings, thrust rings and bearings and the shaft and other mating parts shall have different coefficients of expansion and the limits of use shall be specified by the manufacturer to prevent damage at the specified operating temperature "= 4.4 Heat input should provide a sufficient amount of pressure and pressure circulating fluid bearings, should pay attention to the maximum heat input of the drive components (including bearing friction) and the fluid properties such as specific gravity, specific heat, viscosity, saturated vapor pressure, flow characteristics. 4.5 bearing environment bearing design should provide air and other non-condensable flow can cause changes in the fluid phase and solid content or viscosity changes. 4.6 Filtering When the bearing lubricant is required to be filtered, an automatic clean interior design can be used for filtration. If external filtration is required, the filtration system should advise that flow losses to the drive side should be avoided. Fifth, isolation 5.1 Isolation on the first isolation magnetic pump and shielding pump shielding sleeve is the first pump isolation measures. It should be made of the same or higher material than the corrosion resistance of the pump body. 5.2 Second Isolation In the event of the failure of the first isolation facility (shielding sleeve of a magnetic pump or shielded pump) in some equipment, it may be necessary to take backup facilities to control or collect leakage. There are two ways to use the second guard. One method is to provide a structure outside the first isolation sleeve to limit the escape of liquid through the first pressure isolation sleeve but not fully collect some of the leakage fluid through the second structure but the fast Escape is blocked. This method is called secondary control. The second method is to surround the periphery of the first pressure vessel with a structure that fully collects all of the escaping liquid passing through the first pressure barrier. Do not allow leakage through the second structure, this method is called secondary isolation. If liquid leaks through the first pressure barrier, the pump should be stopped immediately regardless of the method described above. 5.3 The buyer is responsible for providing the closing device and the necessary safety procedures. 5.4 Detection There should be facilities to install the instrument, in order to monitor the temperature of the magnetic pump isolation sleeve. Sixth, the outer bearing (magnetic pump) 6.1 Magnetic pump should have two outer bearings, bearings should be able to withstand radial thrust and axial thrust. The minimum bearing life Lw should be 17,500 hours, the bearings can be thin oil or grease lubrication, such as thin oil lubrication should have oil level indicator, and drainage holes. The manufacturer should set a suitable oil level outside the bearing chamber. Such as the use of grease lubrication and require replacement, there should be replacement measures. Seven, the stator components (shielding pump) 7.1 stator windings should be used for the provisions of the working conditions of the corrosion protection sleeve (ie shield) to protect. The oil filled stator should have facilities for safely sealing the process fluid leaking through the first isolation sleeve. If an enlarged container is used, it should be designed to accommodate a maximum allowable pressure of T for up to 48 hours. The manufacturer must prompt the user about possible leaks in the event of failure of the first isolation sleeve. 7.2 The design life of the motor under the conditions of use specified minimum 40,000 hours. Eight, the outer ring (magnetic pump) 8.1 outer ring should have sufficient axis constraints to ensure that the axis of magnetic components and axis of millet to maintain concentric. External magnetic parts should be balanced to ISO 1940, G6.3 level. The surfaces of ferrous metal parts should be sealed or coated to protect these surfaces from corrosion. IX Materials of Construction 9.1 Parts of pump overcurrent materials include ductile iron, carbon steel, 316 austenitic stainless steel, alloy No. 20, Haslelloy (a low-carbon nickel-chromium molybdenum alloy) and the like. Plugs, pressure parts, and hydraulic parts are not allowed. The contact parts with the liquid should have a corrosion allowance, the size can be determined by the buyer and the manufacturer. X. Installation 10.1 The equipment should be installed outdoors in an unobstructed outdoor environment and at a specified ambient temperature. 11 Bracket (Magnetic Pump) 11.1 The bracket should be designed to withstand the torque of the largest magnetic ring and should be made of ductile metal, such as ductile iron or carbon steel. 12. Test Devices 12.1 If there is a regulation, instructions or control of non-sealed pump to prevent malfunction or malfunction of the device or instrument should be effective and reliable, such as: ①circulating fluid or isolation sleeve temperature sensor; ② bearing axial wear And radial wear monitoring device; ③ For handheld or permanent vibration detectors notch or fixed facilities; ④ motor detection device should be able to detect: power, unbalanced phase, rotation, low current, 趄 current, Single-phase, short circuit or internal fault; ⑤ on the use of external circulation pump, as well as circulating fluid detection; ⑥ steering indicator (shield pump). XIII. TEST 13.1 All pressure vessel parts shall be hydrostatically tested after machining, at a pressure of 1.5 times the maximum design pressure for at least 10 minutes. The hydraulic pressure in the jacket (cooling or heating chamber) can be different from the pump body. Installed pump, if there are provisions, the machine can be sealed and hydrostatic pressure test. If there are regulations, mechanical testing machine can be used. Performance tests and NPSHR (Necessary NPSH) tests, if required, shall be carried out as specified. For NPSHR test, you must conduct performance tests. If secondary control or secondary isolation is provided, the relevant parts shall also be hydrostatically or pneumatically tested. Fourteen, the file 14.1 For each project should provide the following documents: ①pump drawing; ② centrifugal pump data sheet; ③ if there is cooling or heating pipelines should be provided; ④ pump liquid circulation program; ⑤ have Rated performance curve; ⑥ profile and parts list; ⑦ installation instructions; ⑧ motor winding diagram (shield pump); ⑨ coupling outline drawings, parts lists and combinations of tolerance limits; ⑩ special performance test documents.
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