Fire pump selection points know that these are no longer afraid of being fooled!
Wuxi Yuda Polyethylene Welder can meet ISO21307 welding standard. There is a need to examine current practice on a global scale and establish the best procedure(s) for the highest-quality, most reliable and efficient construction of PE butt fusion systems for gas and water distribution.
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2, according to the purpose can be divided: a water supply fire pump group b voltage regulator fire pump group c hand to lift the mobile fire pump unit;
3, according to the pump group's auxiliary features can be divided into: a general fire pump group b deep well fire pump group c submersible fire pump unit.
The above is the basic classification, but various types can be combined with each other, such as low-pressure fire pump, high and low pressure vehicle fire pump, general fire pump group, electric submersible fire pump group and so on.
Selection points 1) Fire pump performance parameter requirements (1) Common fire pump operating conditions 1: When the suction depth is 1m, the rated flow (Qn) and rated pressure (Pn) requirements should be met, and the working pressure should not exceed 1.05 of the rated pressure. Times;
Condition 2: When the suction depth is 1m, the flow rate is 1.5Qn and the working pressure should not be less than 0.65Pn. The maximum working pressure must not exceed 1.4Pn.
(2) Working condition of deep well and submersible fire pump: When the suction depth is 0m, the rated flow (Qn) and rated pressure (Pn) requirements shall be met, and the working pressure shall not exceed 1.05 times the rated pressure.
Condition 2: When the suction depth is 0m, the flow rate is 1.5Qn and the working pressure should not be less than 0.65Pn. The maximum working pressure must not exceed 1.4Pn.
2) Testing of structural requirements, corrosion resistance, mechanical properties, continuous operation, etc. shall comply with the requirements of the standard GB6245-2006.
3) The pump used in the pump unit should be subjected to type identification and type inspection and comply with relevant standards.
The selected prime movers should be identified and conformed to the relevant standards. The engine should have a good start-up performance at room temperature and should be guaranteed to start smoothly within 5s. Within 20s after the introduction of water, the fire pump should be able to reach the rated condition.
4) The water pump impeller rotates flexibly without any jamming.
5) The designer should select and determine the type of fire pump according to the location, area and the specific conditions of the fire water supply system of the fire pump room in the project.
6) The flow rate and pressure of the fire pump shall be calculated and determined according to the requirements for the fire-fighting water volume and water pressure of the service buildings (or factory areas, residential quarters), storage yards, and storage tanks. Fire-fighting pumps should meet the fire water pressure and flow requirements. The flow rate and head of the pump are not lower than the design requirements and not lower than the given value of the performance curve.
7) The fire-fighting water pump of the temporary high-pressure fire-fighting water supply system shall be prepared for one or more use or be prepared for use. The standby fire pump's working ability should not be less than the largest one of the fire fighting working pumps. When more than one equipment is used, the impact of multiple fire pumps in parallel on system flow and pressure should be considered.
8) When selecting a fire pump, its flow rate ~ pressure (Q ~ P) characteristic curve should be flat without a hump. When conditions permit, the pump unit can be integrated with a tangential pump or pump valve (reduced pressure regulator valve).
There are 3 following types of butt fusion welders to meet the standard ISO 21307 : 1. Single Low Pressure Fusion Jointing Welding Machines 2. Double low-pressure Fusion Welders 3. Sigle High Pressure Plastik Welding Equipment. As shown in the graphs of the various systems, the high pressure method of butt welding takes less time to make a weld than low pressure welding fusion. This is a very important factor in lowering the cost of installation, since the cycle times necessary for butt welding large diameter pipes are long. Using the high pressure poly welders means that daily productivity can be significantly increased. Here you can choose relevant SHP series high pressure hdpe welding machines from 40mm-1600mm.
