Summary:Introduction to antifreeze and maintenance of valves
After entering winter, the temperature drops rapidly, and the valv...
Introduction to antifreeze and maintenance of valves
After entering winter, the temperature drops rapidly, and the valve often freezes. If not dealt with at this point, the pipeline is prone to failure.
After entering winter, the temperature drops rapidly, and the valve often freezes. If not dealt with at this point, the pipeline is prone to failure. If it is in some high-risk conditions, accidents may also occur. Therefore, the antifreeze treatment of the valve is very important.
Before the temperature drops, it is necessary to carry out an all-round thermal insulation work on the valve device to make "winter preparations".
Prepare the required tools: insulation cotton, iron wire, vise, utility knife, and carry an effective gas alarm in the gas area.
According to the size of the valve, use a utility knife to cut the appropriate insulation cotton. Then use the vise to cut the wire that needs to be tied. When wrapping the thermal insulation cotton, tear the thermal insulation cotton a little so that it goes around the valve handle to better wrap the valve body. After wrapping the insulation, secure it with wire.
In the process of use, if you find that there is freezing phenomenon and cannot operate normally, do not hit the valve with a wrench or other heavy objects. The correct way is to close the valve, thaw the valve with steam or hot water, and then open the valve.
If the valve is not used for a long time, the medium in the pipeline should be completely removed to prevent the pipeline and valve from freezing. Ensuring safe production is the obligation and responsibility of every enterprise. The issue of valve antifreeze can be big or small. We must not cause an irreversible situation due to temporary carelessness.
Antifreeze should also be divided into regions, and the difference between north and south is not small. According to the characteristics of winter and the actual situation of the project, antifreeze measures for boilers, pressure vessels, pressure pipelines and their auxiliary valves, and safety relief devices in winter should be formulated, and the measures should be put into practice. .
For the parts that are prone to frost cracks, increase the daily inspection efforts. Pay close attention to the sudden and large cooling weather, take thermal insulation and countermeasures in advance, and use thermal insulation materials to strengthen the thermal insulation of the device.
The water in the equipment must be drained after deactivation or maintenance to avoid freezing and cracking; the pressure vessel that may contain water in the medium should be drained regularly, and the water discharge valve should be kept warm; Good thermal insulation; the pouring pipes of chemical systems need thermal insulation; safety valves on boilers, pressure vessels, and pressure pipelines need thermal insulation to avoid being frozen and causing failure; pay attention to keeping warm when doing hydrostatic tests, especially antifreeze for thinner pipes Problem: When the ambient temperature is low, install a liquid level gauge on the pressure vessel that is easy to freeze or install a steam tracer on the pressure pipe, and pay attention to the smooth flow of steam.
It should be noted that if the pipeline is frozen, the valve that does not switch on and off cannot be hard-switched. The frozen cracked valve should be purchased urgently, and the maintenance team should be arranged to bake the pipe.