Is it dangerous to tighten the flange after relieving pressure from the position?

An explosion-proof hammer can be used to tighten the flange.

It depends on the type of medium; for flammable media, anti-explosion wrenches and hammers are used, as tools like copper wrenches and hammers do not generate sparks.

It is necessary to examine the properties of the medium; for example, hexane is volatile, flammable, and explosive, and even residual amounts of this medium after pressure release can catch fire or explode due to impacts or sparks. For flammable and explosive media, it is recommended to use explosion-proof tools.

Is it dangerous to tighten the flange after relieving pressure from the vessel? It depends on the properties of the medium; for flammable, explosive, or toxic media, it’s best to replace the medium. Use explosion-proof tools, and for toxic media, proper ventilation and protective equipment are necessary. Additionally, temperature effects also need to be taken into account

Generally, it is common to tighten flanges after relieving pressure from a vessel. The poster is probably referring to the situation where pressure is only relieved without any replacement of the fluid. What’s important is to consider the properties of the medium: for volatile and flammable substances, especially those that are prone to escaping, explosion-proof and anti-static tools must be used. At the same time, measures must be taken to ensure the safety of the workers, in order to prevent accidents such as poisoning. Most manufacturers maintain a slight positive pressure when dealing with minor leaks in sealed containers. It should be noted that combustion within an effectively controllable range is not dangerous; what’s truly dangerous is an explosion... Of course, it is still recommended that the poster carry out gas replacement when necessary, as safety is of utmost importance... This post was last edited by jindin312 on 2009-4-24 at 20:30.]

It’s possible, but safety measures must be properly implemented

It is necessary to consider what medium the substance in question is, whether it is toxic or harmful, and whether it is flammable or explosive. When removing, loosen the bolts slowly; do not remove them entirely to prevent residual pressure and harmful substances from causing injury

Generally, tightening screws after pressure release is not dangerous. As long as there is no large-scale leakage of flammable gases, that’s fine.

It is common to tighten the flanges after pressure release; however, our factory usually tightens them without releasing the pressure. We are a fertilizer factory, and the maximum pressure here is 32 MPa. It should be noted that hammering is generally not used; instead, a extension rod is employed for tightening. Prevent the generation of sparks.

It’s possible, but if no replacement is done, it’s necessary to maintain a slight positive pressure, around 0.5 kilograms of pressure; this isn’t dangerous, with the worst that can happen being the release of some flames.