What should be paid attention to when removing flange or valve discharge

What should be paid attention to when removing flange or valve discharge

Disassembly of flange or valve drainage belongs to the routine work of chemical enterprises. Before we work, we should understand what hidden dangers exist in this work:
Spray liquid or gas, burn yourself or a colleague
Heavy objects fall and injure
The surrounding obstacles are bruised
(We need to understand that any accident that is not prevented can lead to any accident that has the potential to become a major injury, and these three simple dangers are in everyday life
We need to take active measures against the hidden dangers we anticipate:
When removing the flange, regardless of whether there is medium in it, we must start from our opposite side to remove the flange, ensure that there is no other colleagues or electrical equipment in the direction of flange opening; Two people must ensure that the flange of the *** opening is not personnel; When draining the valve, ensure that there is no person at the valve opening
When working, you must wear a protective cover, never wear no or only wear goggles
Before work, we need to be familiar with the working environment to avoid the collision with the surrounding obstacles due to panic in the operation process. In addition, when entering the work area, we must wear the safety hat, and avoid not wearing or wearing non-standard
When entering the working area, you must wear anti-smashing shoes to avoid flanges falling off or peers falling down and injuring during the operation
The nitrogen sealing device is composed of three parts: nitrogen supply valve, nitrogen discharge valve and breathing valve. The nitrogen supply valve is composed of two parts: a conductor and a main valve. The nitrogen relief valve is composed of a pressure-open micro-pressure regulator with internal feedback. The nitrogen pressure is generally set to 100mmH2O, which is controlled by a nitrogen sealing device.
Nitrogen seal valve principle: when the tank into the liquid valve open, add material to the tank, the liquid level rising, gas phase partial volume decreases, and the pressure increases, when the tank pressure above its discharge nitrogen valve pressure setting, nitrogen discharge valve to open, release nitrogen to the world and make the tank pressure drop, drop to drain valve of nitrogen pressure set point, shut down automatically.
When the liquid outlet valve of the storage tank is opened and the material is discharged, the liquid level drops, the volume of the gas phase increases, and the pressure in the tank is reduced. The nitrogen supply valve is opened and nitrogen is injected into the storage tank, so that the pressure in the tank rises to the set point of the nitrogen supply valve pressure and automatically closes.
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