In installations where the level of fluid intake is below the axis of the circulator pump used to fill in two ways:
1) in aggregates of a small filing with the diameter of the suction pipe of 250 mm at the end of her under the water level have a foot valve. In this case, make the filling through a funnel and a crane at the top of the pump casing from the PEX Plumbing system or special filler tank;
2) in the aggregates with d> 250 mm receiving valves do not put produce and fill with suction air from the pump is a special expansion pump (commonly used types of Grundfos pumps and Taco, creating a expansion to 97%).
If there is contamination of the liquid intake funnel on the suction tube is combined with a slit or a strainer. Control over the operation of the pump is over the testimony of the gauge and pressure gauge attached to the suction by the discharge nozzle, flow measurement is made on the flow-meter mounted in the pump discharge line.
So how about a load of the pump can be measured by manometer readings, are often reluctant to install meters on each pump and have a meter on the common plumbing pipeline, controlling for his testimony filing unit as a whole. As the flow meters are used diaphragms, Venturi tubes and wing water meters. Power expended by the unit, is determined by the voltmeter, ammeter or wattmeter, disposable on an Taco board assembly cli install.
To start the pumping unit should produce preliminary tasks: to ensure free rotation of the shaft, check the tap and manometer gauge, fill pump and suction pipe, open the flow of cooling water into the bearings (in units with a cooled bearings), to check the position of the oil in the bearings (at bearings lubricated). Valve on the discharge plumbing pipeline Circulating pump during start-up must be closed (for n <250 br="">
Start the pump is as follows: turn on the motor and speed it is brought to normal, slowly open valve on the pump discharge nozzle to achieve the required filing date; open valves that lead to the cooling water pump seal. When the pump should monitor the temperature of the bearings and the motor housing, which under normal circumstances should not exceed 60 ° C, the presence of oil in the chamber bearing (with oil lubrication), the density of glands (tightening of the packing is considered normal if he misses a few drops of water and temperature it is low).
Stop pumping unit is closing the valves on the discharge pipe, turn off the engine, close the valve on the suction tube and the cooling off seals and bearings). Start, the service at work and stop assemblies considerable power necessarily governed by special instructions. Special instructions subject to the exploitation of nutrient pumping units of steam boilers and pumps for hot liquids.
With modern technology development of automatic process control automation of pumping units is not difficult. Automatic pump control provides the following operations:
1) preparation of pumps to start, is to monitor the position of valves and pumps filled with liquid;
2) starting and stopping of pumps depending on the flow required by customers;
3) Stop the pump at fault it and start another pump to replace a faulty;
4) protection against overheating, seals and bearings;
5) the protection of hydraulic pumps, it becomes impossible to start the pump, not filled with fluid.
In developing the scheme of automation and protection of pumps may be provided for the necessity of pumping unit for the intended program. Automation improves the efficiency and reliability of the pumping unit, reduces the number of attendants.
