Blind plate location
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When a refinery unit is under maintenance, it is reasonable to install the blind flanges at the inlet and outlet of the unit on which side of the inlet and outlet valves – on the side of the unit or outside the unit? This post was last edited by yfq4308 on 2009-2-21 at 17:06.]
Installing blind flanges is primarily intended to prevent leaks inside valves, as well as to disconnect pipes from equipment and thus avoid any leakage of the fluid inside the pipes into the equipment, which could cause injury to maintenance personnel. Blind flanges on the inlet side of the equipment should be placed near the equipment itself, and those on the outlet side should also be positioned near the equipment；
I think it’s better to install this on the side close to the device, because with the valve flange outside that valve, there’s no need for purging or using open flames. Generally speaking, the blind plate is placed on the side closest to where open flames are used. Or the side that is isolated
Installing blind flanges is primarily intended to prevent harmful substances from causing injury to maintenance personnel due to internal leaks in the valves. The blind plate should be installed on the side where the harmful medium enters the valve; in other words, even if the valve is opened, no harmful gases will escape.
A blind flange is a solid flange used to seal the end of a pipe. It is generally used at the end of water supply branch pipes, as well as for temporarily sealing sections of pipe that need to be pressure-tested first. It is definitely installed on the side closest to the equipment – this is the principle behind using blind flanges.
The shutdown blind plate is generally installed behind the first valve; when repairing a single piece of equipment, it is usually installed behind the valve closest to that equipment (or as an upper plug)
Installing blind flanges is primarily intended to prevent leaks inside valves, as well as to disconnect pipes from equipment and thus avoid the leakage of fluids within the pipes into the equipment. This prevents physical harm to maintenance personnel, reduces energy waste, and avoids environmental pollution. The blind plate should be installed on the side where the harmful medium enters the valve; in other words, even if the valve is opened, no harmful gases will escape.
In fact, it’s decided based on the on-site conditions. The most important thing is complete isolation to ensure safety
Trust the blind flanges, not the valves – this is probably something that must be taught to everyone entering a chemical plant. Installing blind flanges essentially means completely isolating the material flow; on which side should the valve be placed? It must be added to the side that can be removed at any time in the future; otherwise, work will have to stop and the blind flanges will need to be removed, which would lead to laughter from others. Our principle is to ensure that what we do doesn’t become the subject of jokes among others.
If it has to be added on the side of the inlet valve, resulting in shutdown and the need to install a blind flange, that is definitely not correct. At this point, it can only be added after the valve. If adding it before or after the valve has no impact on production, then it doesn’t matter; either location is fine, I think.
The pipeline blind flanges for the inlet and outlet devices are installed on the side facing the inside of the device!
It should be installed behind the valve to facilitate control, as the installation and removal processes also need to be taken into consideration. By installing it behind the valve, one can control the installation and removal process themselves, which ensures safety; if it is installed in front of the valve, one is at a disadvantage and it is not safe either.
When maintaining a refinery unit, it is reasonable to install blind flanges on the inlet and outlet valves of the unit on which side – on the side of the unit itself or outside the unit? Two valves should be installed at the inlet and outlet of the refinery unit, and the blind flanges should be placed between these two valves, as this makes it convenient to install and remove them.
It is generally installed on the side close to the equipment, such as on the flare line. After the equipment has been purged, the valve at the point where the flare main pipe meets the equipment is closed; installing it on the side close to the equipment is the appropriate approach. If it is installed on the outside side, pressure cannot be applied to the flare line, unless the flare main pipe has also been thoroughly purged.
It should be installed after the first valve entering the boundary area, as there are uncertainties regarding external conditions; the first valve allows the system to be isolated, which provides a favorable guarantee for carrying out operations related to the installation and removal of blind flanges. Usually, access to the inner zone of the device should be controlled by a double-valve system.
During maintenance, blind plates are theoretically only applied to the inside of the unit. Because you can’t be in charge of the external pipelines; it’s possible for them to be connected in parallel with other pipelines, and it’s not impossible for there to still be fluid inside them as well.
The location of the blind plate should be determined based on specific requirements; it is generally placed in the direction of material feed
It depends on the actual circumstances; if the piping design connected to the equipment permits it, it should be installed on the pipeline side rather than on the equipment side, as installing it on the equipment side can cause problems with the equipment’s airtightness in the future. In principle, it is not added on the device side.
It is installed on the inside of the device, as there are other components on the main pipe; if material is present in the main pipe, installing it on the outside of the device would make it impossible to remove the blind plate.
Inlet and outlet devices usually consist of dual valves, with blind plates being commonly installed after the first valve in the inlet device!