After a chlorine leak

Leak in a liquid chlorine cylinder? Is it a valve leak? Is it still the bottle that’s leaking? Isn’t there a set of specialized tools for dealing with valve leaks? It shouldn’t be difficult! Yibin Tianyuan has such tools, but they are owned by individuals; the cost might be high. For a chlorine leak, money shouldn’t be a concern!

The gas cylinder is floating on the surface, but the leak point can be below the water level. Where is the leakage point of the owner’s gas cylinder? For gas cylinder leaks, aren’t there many materials available to seal them?

If it really needs to be thrown into the alkali tank, turn its leak points below the liquid surface; if possible, use an object to secure it. But usually, other methods are used to deal with it; it’s best to remove the chlorine gas as quickly as possible! :Lol, throwing it into the pool is also a hassle; I ran into that once before!

Throwing it into an alkali tank is not a good solution either; the best approach is to seal the leak. If that’s not possible, the scientific method is to place the steel cylinder in a sealed space, extract the leaking chlorine gas, and absorb it with an alkali. This post was last edited by haining on 2009-4-7 09:42]

The leak point must be submerged below the liquid surface, and the amount of gas cannot be too large. If the leakage is severe, other measures will still need to be taken.

If the gas cylinder is floating on top of the alkali pool, it can be sprayed with a fire hose, but proper protective measures must be taken.

If the valve of the chlorine cylinder is leaking, it can be replaced while wearing a gas mask. If it is a leak in the bottle body, it can be placed in an alkaline solution; be sure to ensure safety during the treatment.

Actually, you can put half of the gas cylinder in the alkali tank, so that the leakage point of the cylinder will remain under the alkaline solution.

This post was last edited by limingshuguang on 2009-5-17 08:13. OP, don’t panic. Based on what you’ve described, it indicates that there is relatively little chlorine in the bottle. Still, the leak point on the bottle must be pointed downward so that chlorine can come into effective contact with the alkaline solution. If it is only the bottle valve that is leaking, the valve can be replaced using specialized tools; if replacement is not possible, the chlorine gas can be removed using those same specialized tools. I know that chemical treatment plants have such tools.

This post was last edited by limingshuguang on 2009-5-17 08:14. If the leakage is on the back side of the valve, the sealing cover can be used directly; if the leakage is at the threaded end on the front side of the valve, as mentioned by a few people above, alkali solution can be poured into the leaking area.

It can be thrown into an alkali tank to be absorbed by the alkali.

1. Chlorine leakage 1.1 Emergency handling for chlorine leakage due to a failure in the negative water seal for electrolysis 1.1.1 All interlocks are currently in place; in the event of chlorine leakage, it is usually caused by one of the following situations: The level of the negative water seal is low, resulting in the interlock threshold not being reached and thus chlorine leakage occurring； In this case, the pressure in the chlorine main pipe rises sharply in an instant, which may lead to a chlorine leak even though the interlock system is activated and the plant shuts down as a result of reaching the set interlock value ； ? The interlock function did not activate; the interlock value was reached but the interlock was not triggered. 1.1.2 Steps for handling accidents? The head of the electrolysis team shall instruct the relevant system to carry out an emergency shutdown immediately (the emergency shutdown procedures are provided separately) ； ? Reporting and coordination: The team leader and operators report to the dispatchers and department heads; the dispatchers immediately inform the department, production department, safety and environmental protection department, equipment and power department, as well as the company’s senior management to rush to the scene, and also notify the labor union and hospital to make all preparations necessary for treating the injured ； ? The team leader wore an air respirator and used a chlorine absorber to capture the chlorine gas ； ? Immediately after stopping the machine, open the valve connecting chlorine to the exhaust gas; use the negative pressure created by sodium hypochlorite to absorb the chlorine, thereby preventing large amounts of chlorine from escaping ； ? The team leader immediately added water to the negative water seal ； ?On-site command announcement: Upon receiving a report, the dispatcher will, as appropriate, use loudspeakers to inform nearby unauthorized personnel and residents to prepare for emergencies and evacuate the area. Personnel at their posts must wear gas masks (in the event of a significant leak, they should be instructed to initiate an emergency shutdown before evacuating). A temporary emergency response command team is formed consisting of the team leader and the dispatcher; once the department heads, functional departments, and company executives arrive, an official emergency response command team is established to organize rescue efforts, and it is decided as appropriate whether to seek assistance from external forces such as the fire department (119 for fires, 120 for medical emergencies). 1.2 Chlorine leakage caused by the rupture or disconnection of the chlorine treatment main pipe due to electrolysis. Once a pipeline leaks, a large amount of chlorine will escape; the allowable concentration of chlorine in the air is 1 mg/l, while levels of 30 mg/l can be life-threatening. Therefore, it is necessary to control and address this situation as quickly as possible. 1.2.1 Emergency response measures: The supervisor shall immediately contact all caustic soda workers, security personnel, and those working in nearby areas, and instruct them to wear filter-type gas masks ； ?The electrolysis team leader immediately pressed the emergency stop button ； ? The operator must immediately contact the dispatch team, those in charge of chlorine and hydrogen handling, maintenance staff, relevant departments, business units, and company leadership to arrive at the scene ； ? The head of the electrolysis team turned on the amplification equipment, activated the alarm, and made an announcement asking the villagers in the vicinity as well as anyone not related to the factory to evacuate promptly to safe areas upwind ； ? Security personnel went to the site to set up barriers to prevent unauthorized persons from entering; these barriers were placed at concentrations of chlorine in the air below 1 mg/l ； The team leader immediately organized personnel to turn on the fire extinguishing water and use it to flush and dilute the area where the connection was broken, while the chlorine safety officers promptly used chlorine scrubbers to remove the chlorine gas from the air ； ? Notify maintenance to arrive on site for handling when the chlorine concentration in the air is below 1mg/l. 1.3 Chlorine leakage in the outer tube: Any leakage in the outer tube, including pitting, cracks, or fractures, requires the plant to be shut down for repairs. Upon receiving notification of a leak in the outer tube used for hydrogen chloride treatment, the personnel in the control room immediately initiate an emergency shutdown procedure ； 1.3.2 In case of electrolysis operation issues, promptly contact the dispatch team, maintenance staff, relevant department heads, and company executives ； 1.3.3 The personnel responsible for inspecting the outer pipes should immediately go to the scene and set up warning barriers to prevent passersby from accidentally coming into contact with the toxic substance. Handheld chlorine detectors should be used to measure the chlorine concentration in the air; the warning barriers should be installed at a level below 1 mg/l ； 1.3.4 Once the current drops to 0, the chlorination process directs the chlorine pump outlet from the distribution station to the hyposodium solution, after which the chlorine pump is stopped. The chlorohydrogen treatment notification instructs PVC to disconnect the original chlorine users from the external pipeline ； 1.3.5 Electrolysis: Chlorine gas is directed tangentially toward hyposodium via HV2001 and HV2002 ； 1.3.6 Open the valve that connects the distribution station to the outer tube, and use the sodium hypochlorite system to absorb the chlorine gas in the outer tube ； 1.3.7 Notify the maintenance worker to carry out repairs and seal leaks, being careful not to use welding ； 1.3.8 The method for purging when welding is necessary is as follows: Drain the liquid level in the negative water seal, use a chlorine pump to extract air and direct it from the PVC chlorine distribution station to the sodium hypochlorite absorber; welding can be carried out only after analysis shows that the samples meet the required standards ； 1.3.9 Welding is strictly prohibited without prior analysis confirming compliance ； 1.4 Internal pipeline leaks in the system: Leaks that occur mainly after the chlorine pump, including erosion, cracks, and breaks, require the system to be shut down for repair. Upon receiving notification of a large-scale leak in the internal chlorine treatment pipelines, the personnel in the control room immediately initiated an emergency shutdown procedure ； 1.4.2 In the event of an electrolysis operation issue, promptly contact the dispatch team, maintenance staff, relevant department heads, and company executives in charge ； 1.4.3 The personnel responsible for handling chlorine should immediately go to the scene and set up a warning barrier to prevent passersby from coming into contact with the toxic substance. A handheld chlorine detector should be used to measure the chlorine concentration in the air; the warning barrier should be established at a level of less than 1 mg/l ； 1.4.4 Once the current drops to 0, electrolysis passes through HV2001 and HV2002 to convert the electrolyzed chlorine into hyposodium. For chlorine treatment, direct the chlorine pump outlet from the distribution station to hyposodium, then stop the chlorine pump. The chlorine treatment notice instructs PVC to disconnect the original chlorine users from the external pipeline ； 1.4.5 Notify the maintenance worker to carry out repairs and seal leaks; be careful not to use welding ； 1.4.6 The method for purging when welding is necessary is as follows: Drain the liquid level in the negative water seal, use a chlorine pump to extract air and direct it from the PVC chlorine distribution station to the sodium hypochlorite absorber; welding can be carried out only after analysis shows that the samples meet the required standards ； 1.4.7 Hot work is strictly prohibited in the absence of a satisfactory analysis result ； 1.5 Emergency Plan for Chlorine Leakage from the Atmospheric Compensation Valve of the Electrolytic Chlorine Main Pipe 1.5.1 Analysis of the Causes of Chlorine Leakage from the Atmospheric Compensation Valve of the Electrolytic Chlorine Main Pipe The atmospheric compensation valve of the electrolytic chlorine main pipe is used to prevent excessive negative pressure of chlorine in the electrolyzer when the chlorine pump continues to operate after an emergency shutdown of the electrolysis process; its purpose is to maintain a stable chlorine pressure and thus protect the ion exchange membrane. However, since the pressure of electrolytic chlorine is more volatile after parking compared to normal conditions, when the chlorine pressure is positive, chlorine escapes from the compensation valve. The reasons for this leakage are as follows: ? The compensation valve opens at the wrong time. It is strictly prohibited to open the valve immediately after the rectifier has stopped operating, as there is a strong negative pressure at that moment. Operators tend to make large adjustments, which may result in a slight positive pressure. If the compensation valve is opened under such conditions, there is still a large amount of chlorine remaining in the chlorine main pipe, increasing the risk of chlorine leakage ； The compensation valve also needs to be closed promptly when the current starts to increase during electrolysis. Chlorine is generated as soon as voltage is applied to the electrolyzer; at this stage, the amount of chlorine is low, so the chlorine pressure is prone to fluctuation, which can lead to a positive pressure condition, increasing the likelihood of the compensation valve leaking chlorine ； ? The compensation valve did not close in time. When the chlorine pressure fluctuates significantly, it should be shut off promptly; it must be turned off before starting up, and after stopping, it should be shut off again once the chlorine to exhaust gas valve is opened ； Due to large fluctuations in exhaust gas pressure, it is necessary to prevent backflow of waste chlorine gas from the sodium hypochlorite exhaust pipe and avoid chlorine gas leakage from the compensation valve ； 1.5.2 Emergency response plan for chlorine leaks: Immediately put on a gas mask and close the relief valve of the relevant system ； ? Wear a gas mask and use a chlorine absorber to capture chlorine gas ； ? Open the window for ventilation ； 1.5.3 Preventive measures to avoid chlorine leakage from the atmospheric compensation valves of the electrolytic chlorine main pipe: Place warning signs at both compensation valves to indicate the potential hazards, and operate these valves with caution ； Under normal circumstances, it is strictly prohibited to open this valve. Before doing so, explicit permission must be obtained from the dispatch team and technicians, in order to prevent chlorine leakage and avoid air entering the system, which could result in low chlorine purity in another system and affect production in subsequent stages ； ?Before opening this valve, call to inform the operator responsible for adjusting the chlorine pressure to be vigilant regarding the pressure, and check that the valve for hypochlorite is fully closed, especially to maintain a negative chlorine pressure and prevent chlorine leakage due to positive pressure.

13# wenlong999 It turns out that using an alkali tank to absorb accidental chlorine gas is not a very appropriate approach. This is because as the amount of liquid chlorine in the cylinder decreases, the cylinder becomes lighter; moreover, as the liquid chlorine continues to vaporize, its density drops further, causing the cylinder to float on the surface of the pool. In addition, the leakage opening on the cylinder faces upward, resulting in very poor absorption efficiency. Now, many factories in China have stopped using alkali tanks. Technology is constantly advancing!

The previous chlorine absorption setup used a hose to connect to negative pressure. Place the tube at the leak site when chlorine leaks. And then process it.