Role of lateral seismic support
Scrap seismic support is a support with seismic function. When encountering severe vibration, the seismic support will not be affected by the vibration and has reached the seismic purpose. In short, it is the seismic measures installed on the electromechanical pipeline equipment. The seismic support of the device can prevent and reduce the damage of earthquake to the electromechanical equipment in the building. Reduce the damage of earthquakes and safeguard people's lives and wealth.
Mechanical and electrical engineering equipment such as building water supply and drainage, fire protection, heating, ventilation, air conditioning, gas, heat, electricity, communication, etc. after seismic reinforcement, when encountering an earthquake of local seismic fortification intensity, can reduce earthquake damage, reduce and avoid the occurrence of secondary disasters as far as possible, so as to reduce casualties and wealth losses. Electromechanical seismic support is used to limit the displacement of electromechanical engineering equipment, control the vibration of equipment, and transfer the load to various components or installations on the bearing structure.
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The design and selection of compensator is one of the six key technologies in the heat supply network. Tetrafluoroethylene compensator is also the place where accidents of directly buried pipeline heat supply network occur frequently, and is the weakest link in the pipeline system. The design selection must adhere to:
1) Tectonic science and mature technology;
2) Material guarantee and rigorous process;
3) The parameters are correct (pressure, temperature, displacement, allowable fatigue life, pre deformation, etc.), and the design is correct; 4) Inspection standard, safe and reliable;
5) Anticorrosion and thermal insulation ensure the quality.
In addition, the correct device and reasonable operation will reduce or eliminate the potential accidents brought to us by the compensator.
2、 Allowable fatigue life of contraction joint
The corrugated pipe fittings in the compensator work under the high stress state of data submission limit, and each change cannot restore its original free length, leaving residual deformation. When the residual deformation accumulates to a certain level, the corrugated pipe will be destroyed, and the number of cycles destroyed is called the fatigue life Nc of the compensator. In practical application, a certain safety factor nf (multiple) is taken. The allowable fatigue life [N] of the compensator is N]=Nc/nf and nf is generally 10~15. Because some manufacturers choose different nf values for design, the practical compensator [N] is also very different. In the industrial standard "Technical Specification for Prefabricated Steam Insulation Pipe for Urban Heat Supply", the service life of the pipeline is required to be more than 25 years. In practice, the pipeline is directly buried. Due to the change of operating load, the operating frequency is large, and the consumption is uneven day and night, so the manufacturer is requested to provide products [N] ≥ 1000 times.
3、 The compensation amount of contraction joint (compensator) is determined
In conclusion, the compensation amount of the contraction joint is not a fixed number, and the working temperature affects the pressure as well as the displacement. This requires us to consider the allowable fatigue life (times), safety coefficient, practical working temperature, pressure and displacement (compensation amount) that can be provided by the compensator when designing. It is suggested that, according to the requirements of CJJ34-2002 (J216-2002) design standard [10], the compensator for directly buried steam insulation pipeline should be selected according to: normal working pressure/nominal pressure=0.75, normal working displacement/rated displacement=0.70, so as to ensure the extraordinary safety margin, make the life of the pressure pipeline of urban heat supply network more than 25 years, and the number of point stress cycles 7000 times.