What to do if the drain is blocked?
Thread Content
When starting up or shutting down the device, blockages in the drain flow often occur. For the drainage of fluid pipelines that contain non-toxic and harmless fluids at low pressure or low temperature, it is possible to use a wire to push things out directly. However, when dealing with pipelines containing slurry, heavy oil, or other toxic and harmful substances, using a wire in this way could likely lead to accidents. I would like to ask everyone if there are any good ways to solve such problems? Or invent a simple and practical tool to carry out the operation?
For heavy oil lines or gas lines, use steam to heat the valves, and cover them with other materials such as asbestos sheets to protect the legs. Anyway, there’s no other good way either.
First, sweep the line~~~ clean the medium and relieve pressure~~~ handle the drain and vent valves~~~ then supply steam. It’s troublesome, but safety first
During shutdown, the valve can be turned down a bit, and the pipes can be tapped to dislodge impurities; this task must be done slowly and carefully. A wire can also be used for this purpose, but be careful not to face it directly. It’s one thing if those areas using high-temperature heavy oil are not in use during startup, but an accident could be catastrophic!
If an important drain is blocked, and assuming the valve is of good quality and functional, a short section with external threads can be welded on; the valve should then be opened to its maximum position, and a drill bit suitable for drilling pipes should be connected to it. If the drill bit becomes lighter, it indicates that penetration has been achieved; at that point, the drill bit should be removed, the valve closed, the drill bit taken apart, and the valve tried opening again. (This does not apply to globe valves.) If the quality of the valve seems unreliable, a ball valve or gate valve can be welded in between.
Apply multiple methods together; it will eventually work. Pipelines usually have other drain ports as well, which you can try using. Although it’s dangerous, be sure to take proper safety precautions – safety first after all
For clearing blockages here, the common methods are: first, heating with steam; second, hitting the pipe with a wrench; third, using a thick wire to push out the blockage. They’re usually very effective; these are the methods I use.
There’s no good solution; I often encounter this problem. First, heat the drain valve with steam, and if it still doesn’t work, cover it with a straw mat and then use wire to clear it out. Be careful yourself, keep the valve opening low, and have those behind you move back a bit – that should do it.
Heat the valve with steam, and protect yourself by using materials such as asbestos cloth. Gradually open the valve a little more after it has been heated, and then heat it again ； In short, increase the valve opening while heating ； When it has been turned almost halfway, extra caution is required; it is best to turn the valve a full turn and then half a turn back, using this method to gradually open the valve.
1. Adopt the positive dredging method that everyone mentioned earlier. The method needs to take into account the safety aspects of the medium as well as the conditions at the site. 2. As mentioned earlier, steam heating can be used; flame heating is also an option. Cooling can be achieved by utilizing the principle of thermal expansion and contraction, as well as the difference in expansion coefficients among different materials. Adding impact force should work fine in most cases, especially when dealing with impurities that are relatively hard. 3. There are also some special situations, such as when certain materials crystallize or polymerize, resulting in products with high plasticity. At this point, it is possible to consider using high-pressure nitrogen in reverse flow for purging. This requires considering the design conditions of the equipment
Not bad, thank you! ! Try to study a bit*
If the drain in the heavy oil pipeline is not functioning properly, steam can be used for heating, although it takes some time
This is indeed a very troublesome problem. Especially in the slurry and re-refining systems, the drainage pipes are hardly functional during shutdowns for cleaning. This happens every time we shut down the system; therefore, I ask the construction team to provide me with copper welding rods that have greater toughness. I stay at a distance, keep the drainage pipes slightly open, and use seaweed* to protect against splashes. I then use the copper welding rods to clear the drainage pipes, though sometimes it’s inevitable that my clothes get dirty.
1. Heat with steam first 2. Tap the pipeline 3. Drain slowly