Abstract: This paper introduces the main principles and contents of compiling National Standard Atlas for Selection and Installation of Small Submersible Sewage Pumps, and explains the related problems. According to "2000 National Building Standard Design Compilation Work Plan" issued by the Ministry of Construction, China National Machinery Design Institute No.1 and Jiangsu Institute of Fluid Mechanics Institute jointly assume the national standard of "Small Submersible Sewage Pump Selection and Installation" (01S305) The preparation of the task. The Atlas has been published by China Institute of Building Standards Design Institute since July 28, 2001 in all parts of the country. Compared with the traditional horizontal sewage pump (PW type), submersible sewage pump has the following salient features: (1) the use of new sealing materials and sealing process, so that the pump body can work long-term diving into the water. (2) Adopting a large passage, an impeller with anti-winding anti-clogging function greatly expands its application range. (3) The use of advanced electronic control technology, so that the pump overload, lack of phase, leakage, water level alarm and other automatic protection and automatic level control. (4) The use of mobile installation and automatic coupling device with a fixed installation, to meet the engineering construction of a variety of sewage, wastewater lifting sites, and for the pump maintenance, maintenance, overhaul great convenience. It is precisely because of the above several characteristics, so that the pump in the 20th century, 90's has been rapid development and extensive application. With the widespread application of submersible sewage pumps in construction projects, engineering designers all over the country have reflected in recent years, hoping to have a book to solve the large-scale selection of submersible sewage pumps used in construction design And install the standard atlas to regulate the selection and installation methods to reduce the duplication of efforts in the design process. It is for this reason that the Ministry of Construction formally approved the establishment of the national standard atlas for selection and installation of small submersible sewage pumps in 2000. 1 Atlas apply (1) The Atlas applies to the basement of buildings and outdoor sewage pools, sewage collection wells, sewage pumping emissions. (2) is drained, wastewater temperature does not exceed 40 ℃, pH is 5 ~ 9 (QX series is 6.5 ~ 8). (3) When used for pumping up and discharging industrial wastewater, the quality of waste water should not cause corrosion to submersible sewage pumps and pipes. (4) QDX, QX series small submersible pump is only applicable to pumping pumping of cleaner wastewater in the basement pump room, bicycle garage and other places. 2 into the Atlas of submersible sewage pump types (1) Small submersible pump [QX (WQK), QDX (WQKD) series], should be used for cleaner wastewater pumping. (2) ordinary submersible sewage pump (AS, AV, QW, WQ series) should be used for shorter residence time of sewage, wastewater pumping. (3) Automatically submersible submersible sewage pump (JYWQ series), should be used for more sediment, longer residence time, the density of 1 ~ 1.3 t / m3 of sewage, wastewater pumping. 3 Atlas submersible sewage pump installation Indoor sewage pool (sump) with mobile installation (hoses) (single pump), fixed installation (pipe) (single pump, double pump) and with automatic coupling device fixed installation (single pump, double pump) 3 kinds of forms. Hose connection is only limited to the mobile installation of motor power? N?? 7.5 kW submersible sewage pump and exhaust pipe? DN? ≤ 100 mm occasions. Outdoor sewage tank only with automatic coupling device with a fixed installation (double pump) a form. For the installation of submersible sewage pumps for fire elevator drainage pits, two rigid pipe connections or two fixed auto-couplings shall be adopted, and the effective volume of the water collection wells is not less than 2.0 m3 and the rated flow of the submersible sewage pump is not less than 36 m3 / h 4 into the Atlas of submersible sewage pump flow, head and motor power range As the compilation of this Atlas of the starting point is to solve the basement and outdoor sewage pools, sump sewage, waste water pumping up and exhausting does not involve independent municipal engineering rain, sewage pumping stations and water projects required for the use of Submersible sewage pump, therefore, included in the Atlas of this submersible sewage pump (including small submersible pump) specifications: discharge diameter? DN? 20 ~ 150, flow 1.5 ~ 200 m3 / h (including small submersible pump discharge diameter For DN 20 ~ 50, flow 1.5 ~ 15 m3 / h; submersible sewage pump discharge diameter? DN? 50 ~ 150, flow 10 ~ 200 m3 / h). Head 6 ~ 32 m, motor power 0.18 ~ 22 kW (including small submersible pump 0.18 ~ 1.5 kW, submersible sewage pump 0.75 ~ 22 kW). In order to facilitate the flexible selection of designers based on the quality of the sewage to be lifted, we believe that the submersible sewage pumps of different discharge diameters should overlap in a certain range. Atlas of this book into a variety of discharge diameter submersible sewage pump flow range is so determined: DN 20 ~ 45, flow rate 1.5 ~ 15 m 3 / h; DN 50, flow 10 ~ 25 m 3 / h; DN? 65, flow 20 ~ 40 m 3 / h; DN? 80, flow rate of 25 ~ 60 m 3 / h; DN? 100, flow rate of 45 ~ 100 m 3 / h; DN 150, flow 100 ~ 200 m 3 / h. According to the design of the project completed by our hospital and brotherhood over the years, the scope of the above specifications can meet the needs of the vast majority of architectural engineering design in all walks of life. 5 on the automatic mixing submersible sewage pump JYWQ series of automatic uniform submersible sewage pump is designed on the basis of ordinary submersible sewage pump a special water diversion device, the use of pressure in the pump cavity flow, with the motor speed of rotation to 10 ~ 20 m / s swirl speed Rinse the bottom of the sump (sump) to disperse the sediment and mix it with the water to prevent the sediment of the sump (sump) from accumulating and solidifying. The pump is suitable for the kitchen restaurant oil separation waste water and domestic sewage containing manure, with more mud sediment underground garage waste water and other sediments, longer residence time of sewage, waste water discharge. Compared with the conventional design of a submersible sewage pump discharge pipe connected to a DN25 short-cut valve and rubber hose used to wash the sewage pool compared to the practice of submersible sewage pump with automatic mixing, often Rinse, without special operations, to ensure that the bottom of the accumulation of sediment accumulation and many other advantages. 6 Submersible sewage pump pipe diameter calculation principle According to relevant regulations, the calculation principle of submersible sewage pump discharge pipe diameter in this Atlas is that the submersible sewage pump flow is calculated according to the nameplate flow (high efficiency point flow) of the submersible sewage pump, and the flow rate of single pump discharge pipe is controlled at 1.2 ~ 1.8 m / s ; In the case of dual-pump installation, basically one by one for the preparation of consideration, but in special circumstances (such as fire and short-term displacement greater than the design of the second flow) there are 2 pumps may work simultaneously. At this time, the common discharge pipe is superimposed on the nameplate flow, irrespective of the work point offset. Therefore, the dual pump common discharge pipe when the single-pump working speed control in the 0.75 ~ 1.2 m / s, dual-pump working speed control in 1.5 ~ 2.4 m / s. 7 Submersible sewage pump pipe material According to the relevant provisions of the specification, in addition to the mobile installation of hose connection parts using fabric reinforced rubber hose, the discharge pipe can be hard plastic water supply pipe, centrifugal casting ductile iron drainage pipes, steel pipe, steel-plastic composite pipe. The pressure capacity of pipes and fittings shall not be less than 0.6 MPa. What kind of pipe, selected by a single project design staff. 8 on the submersible sewage pump pipe line attachment settings Atlas, submersible sewage pump discharge lines are provided with control valves, check valves, flexible rubber pipe joints and pressure gauges. The control valve recommended gate valve, but also can be used according to the need of butterfly valve; Check valve recommended spherical sewage check valve; The pressure rating of pipe fittings are considered according to 1.0 MPa. In the process of drawing atlas, many experts and manufacturers suggest that the best not to gate valve, check valve and other piping accessories arranged in the sewage pool, in order to facilitate maintenance and management. Therefore, in the album, the indoor sewage tank will be the valve and other accessories arranged in the pool outside the pipeline; outdoor sewage pond is another set up a valve well for user maintenance and management to create favorable conditions. 9 Determination of the effective volume of the sump (sump) The effective volume of the sump (sump) when the pump is switched on and off automatically (not including the part below the stoppump water level) is not less than the output of the maximum one pump for 5 min and the number of starts of the pump per hour can not exceed 6 times; when the pump is manually The effective volume of the sump can be controlled not to exceed