Water Pump Stationشرکت فنی مهندسی طرح و کار
Water pump stations are designed and built to provide the required pressure for water and sewage transmission lines. The main task of pump station the head is required in the transmission line. This head depends on the length of the track, the height difference, the path equipment and the type of fluid.
In water pump station equipment such as water or sewage transmission pumps, inlet valves (suction valves), exit valves (deliverability), there are buffer tanks for controlling the ram, storage tanks, or sewage and instrumentation. All the station equipment is said Pumping.
After designing and simulating water transmission lines and determining the amount of flow and the required pressure, designing and building type of transmission lines a water pump station is accomplished. TARHOKAR Engineering Company has a successful work history in designing, manufacturing, and installing various transmission lines and water pumping station.
Design of water pump station
A water pump station or pumping house is constructed under pressure lines for water or sewage. In fact, Pump station of flow provides the required pressure that is calculated and estimated in the design of the transmission lines. For this purpose, a number of pumps is considered that part of these pumps is in standby mode (Stand by) and some in the state Work (Duty).
The choice of the number of pumps at the water pump stations takes into account due to the pattern of consumption throughout the day. Also emergency conditions such as equipment and pumps fail to accommodate the stand. For example in the conditions that pump station provides drinking water to a city. It is necessary to select 50% of the station capacity for Standby. In addition to selecting the number of pumps, at a pump station, the storage tank should be considered. The tank can be made of polyethylene, metal or concrete. However, the water or sewage entering the pump station is stored in this reservoir and when the pump is turned on; they are sent to the transmission lines.
Other essential facilities are at the water pumping station or sewage valves. The most important duties of the pumping station’s valves include these cases:
1. Controlling the flow rate and the pressure of transmission lines
2. Opening and closing the flow during failure and repair of the pump
3. Avoid of water reversal and control of ram blow
4. Prevent sand entering the pump with the help of a filter tap
5. Discharged air inside the water or sewage transmission lines
At each water or sewage pumping station, there are two collectors, one for suction and one for delivery. These collectors operate pumps at the water and sewage pumping stations in parallel. The suction system of the pump station should be such that it does not cause the cavitation phenomenon in the pump. Choosing the valves at the inlet of the pumps and considering the suction collector height of the reservoir is one of the important parameters in designing the water and sewage pump stations. The system must also be designed in such a way that the pump always operates at its own point of view to increase the useful life of the pump station.
Control of the water hammer on the pump station
The water hammer actually causes a sudden change in fluid velocity along the fluid transmission line. This sudden change can be caused by speed of the various factors, the most important are pump shutdowns, power outages at the pumping station, errors in the closing of the gates of the transmission lines by operator and so on.
During the sudden stopping of the pumps at the pumping station, the fluid speed (water or sewage) reaches zero in the transmission lines which causes the occurrence of a water hammer which severely damages the equipment especially the propeller pumps. To prevent this problem some installations are located at the pumping station so that, with the sudden shutdown of the pumps, the flow of length of the pipeline is amortized. Some of the most commonly used equipment to control the ram’s impact are as follows:
1. The use of pressurized bunker tanks filled with pressurized weather. This shockwave is a return shock wave
The water hammer is controlled and immobilized inside the pump station.
2. The use of a flywheel on a pump coupling increases the electromotor inertia for a period of time and avoiding from the changes in the fluid velocity
3. The use of the Surge tank at the locations of the transmission lines that interrupts the energy system of the earth when it is off.
Operation of water pump station
The pump station is essential in a distribution network and transmission lines as the main supplier of water and sewage. Hence a benefit principles of structural analysis is essential especially in cases where the pump station is used for water supply to residential areas or industrial complexes. The first problem in the operation of the pump station is the pressure regulation and pump operation. It should be noted that the pump in a certain range of pressure and discharge has a high efficiency and continuous operation on other pressure and discharge conditions causes the pump to be depleted.
To solve this problem, a control valve with an automatic actuator is used to adjust the pressure and pump flow rate.
When the pump is switched on and the pressure in the transmission lines is low. The pump operates at a maximum flow rate and minimum pressure. In this condition, the control valve automatically is semi-closed until the pump is damaged. After the transmission lines are pressurized, the control valve is open.
Another issue is the control and operation of the pump station which controls the level of the reservoirs and their relationship with the pump. This is important from now on the periodic lubrication bearings, pump coupling control, electromotor temperature control, valve controls and instrumentation from other points. Important in the operation of the pumping station. Design of automatic control systems and monitoring of pumping station in engineering company the design and operation are done with the help of instrumentation and command circuits.
Select equipment material at the water and sewage pump station
The purpose of the equipment is in fact the type of pipes, valves, butterflies and charging pumps. The kind of equipment in the first place depends on the quality of water or sewage. Salinity or EC, the concentration of chloride ion, acidity or the same pH and the amount of solids present in water or sewage play a role in the selection of equipment. The equipment generally includes the following:
Stainless steel (AISI 316, 304), anti-corrosive for saline water with high chloride and low pH
Polyethylene (HDPE) for use with high solids
Steel and cast iron materials with color coating for ordinary water and cost efficiency.
Applications of water pump station
Since the pump station is classified as the general industry; therefore, there are several uses that some of them are mentioned:
1. Using in the distribution network and urban and rural water pipelines.
2. Using in the transfer of wastewater collected to municipal or industrial waste water treatment plant.
3. Supply of water for industries and mines in remote areas that do not have access to the water network.
4. Transferring water from the sea, river or lakes for industrial and agricultural uses.