Water supply and drainage design of the pump selection examples

Abstract: The choice of pump in building water supply and drainage design is very important. Feed pumps, sewage pumps, fire pumps in the selection should be based on the characteristics of their systems and pump parameters, maintenance and other aspects of factors to consider. 1, Project Overview Xiangya Hotel is located in Hangzhou's bustling commercial and financial center, located in the middle of the old city Jiefang Road, east of the train station, west of West Lake. The building consists of 2 floors underground, 21 floors above ground and 2 middle technical layers. It is a four-star hotel integrating guest rooms, recreation, conference, catering and bar. The building area is 32,000 m2 and the building height is 75m. Hotel podium Water Supply System, the main building water supply system, basement wastewater discharge system, fire hydrants, sprinkler system designed to meet the use of functional, the system of choice of the pump is more critical. Pump characteristics, parameters, prices, after-sales service is directly related to the system is put into operation at a stable, safe and fixed equipment, one-time investment and Water Pump routine maintenance and repair. In the design of the research process, we through the pump parameters analysis and comparison of the practical application of the project inspection, the final selection of DL, QW, XB series of pumps. Now put forward the design of the pump to use a little understanding and experience for your reference. 2, the choice of water pump Sunny hotel water supply to the use of the way down, that is, municipal water supply network to two underground ring network to the living pool, pump were raised to the podium, the main roof water tank, and then by gravity to the Water point. Pump start and stop by the level controller to control. The use of upside down to this type of water supply, the roof of the water tank has played an intermediate role in the pump start-up operation Q ~ H value is more constant, Q ~ H value does not vary with the size of the water point changes in water, as long as the design of the pump to meet the calculation of Q ~ H value can be. However, it should be noted that the Q ~ H value of the selected pump should not be larger than the Q ~ H value of the design and calculation, and should generally be controlled at about 5% of the designed Q ~ H value. According to the above principle, we design the podium, the main building water supply system pumps selected as 65DL32-15 × 3 and 80DL50-20 × 5 type pump. 3, the choice of drainage pump Sunny hotel on the second floor with the underground pump room, air-conditioned room and other equipment room and laundry, staff restaurant, bathroom, toilet and other service rooms. Design to set sewage sludge collection pond to collect wastewater, and then use the Submersible sewage pump were raised to the outdoor septic tank and municipal drainage network. In order to make the basement wastewater discharge unobstructed, it is necessary to take into account that underground sewage wastewater, especially stool water, contains more linear substances when selecting a Sewage Pump. Sewage pump to have a certain degree of suction, tear the function of linear substances, or easily lead to plug the sewage pump, damaging the motor. After a comprehensive analysis, the design selected 100QW series Submersible Sewage Pump. This series of pumps have the function of pumping linear objects below 20cm, and equipped with automatic probe inside, which can effectively control overload, leakage and short circuit, and is especially suitable for sucking sewage in basement. Sewage pump selection should also consider a suction time, which is related to the sewage pump starts the number of times per hour and set the pool size. Reference to the relevant information, the general suction pump a suction time of not less than 5min, we will design a sewage pump suction time as 10min, set the reservoir volume of 5m3. This sewage pump start about 2 times / h. Set the pool depth is generally 1.2m more appropriate. 4, the choice of Fire Pump Sunny Hotel is a high-rise civil buildings, according to "high-rise civil building fire code" requirements, fire water consumption as follows: a, outdoor fire hydrant Q = 30L / s, fire 3h; b, indoor Fire hydrant Q = 40L / s, the fire continued 3h; c, automatic sprinkler system Q = 30L / s, the fire continued 1h. Fire water supply system according to "high regulation" requirements: "When the hydrostatic pressure is greater than 0.8MPa to take zoning water supply," for this design partition parallel water supply. Fire water supply system is determined, the key to fire system design is the choice of fire fighting equipment. According to "high regulation" requirement, fire pump need 1 with 1 prepared. This fire hydrant area, the lower zone to set 4 fire pumps, automatic sprinkler system high zone, low zone to set 4 fire pump, two fire fighting system to be set up 8 high-power, high flow fire pump. In the design of the survey, we found that the pump industry has introduced a new type of multi-outlet fire pump that has the ability to supply water to both high and low areas so that only four fire pumps can be used to satisfy fire hydrant and automatic sprinkler Large system of water supply requirements. After consulting the manufacturer's technical parameters of the multi-outlet fire pump, there was a problem that confused the designer, that is, the fire location of each building was unknown. If the fire broke out at the level of the demarcation zone, the high and low zone fire hydrants , Automatic sprinkler system at the same time start sprinkler, fire water level outlet at the same time the beginning of the water outlet, fire pump flow, head can meet the design requirements? The production of such fire pumps manufacturers of technical advice , Have not been satisfied with the answer. Puzzled with this fire pump manufacturers to fire pump for the demarcation of the technical parameters of the test. January 19, 1998, we designed the design of the selected "XB" series of multi-outlet fire pump flow, lift test. "XB" series multi-outlet fire pump Q ~ H curve changes more smoothly, fully meet the partition at the same time the upper and lower water requirements. Multi-outlet fire pump for high-rise building indoor fire water supply system is reliable, the system is economical, can be said to be the ideal fire water supply system. 5 Summary Water supply and drainage design, especially for high-rise building water supply and drainage design, each system has a different pump technology, the use of requirements. To make each system can be normal, safe and efficient operation, water supply and drainage design of the pump should take into account the selection of pump characteristics, parameters, the scope of application, the pump manufacturer's production technology and pump prices and other factors. For the newly developed pump, in particular, to understand clearly a variety of technical parameters, scope, so that the drainage system put into use in order to stable, safe and economical.