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Showing posts with label gas cylinder storage. Show all posts
Showing posts with label gas cylinder storage. Show all posts
Oct 16, 2013
Jul 15, 2010
Chlorine leak from cylinder at Mumbai Port Trust
It is reported in TV and websites of newspapers that on 14.07.2010 at about 0315 hrs, chlorine liquid leaked from one of the 105 cylinders seized by customs in 1994 years ago and kept at Mumbai Port Trust (BPT) scrap yard. Out of 141 cylinders, five were full and others were empty. Chlorine leaked from one of these 5 cylinders. More than 100 persons (126) were admitted in various hospitals and more than 500 persons in the area were evacuated. Services of Fire brigade, National Disaster Response Team and other agencies are utilized to bring the situation under control. Subsequently the chlorine in 5 cylinders was neutralized which could have been done long before.
Disposal of gas cylinders is a major issue and is to be as per Gas Cylinder Rules. The scrolling news in a TV channel mentioned that BPT asked Controller of Explosives to dispose the seized cylinders and as there is no response, cylinders were left as such. Controller of Explosives is not the agency for disposal of cylinders. They are regulators to issue licences for storage and handling. It is not known why the cylinders were seized by customs. However, BPT should have asked the person (consignee) responsible for bringing the cylinders to dispose or BPT should have disposed and collected the charges. Disposal means what we can do?. Either give the cylinders to users of chlorine or neutralize the gas in controlled manner.
Apart from the above incident of leaving gas cylinders in scrap yard, few months back we read that radioactive sources belonging to Delhi University were found in the scrap yard of scrap collector. In a book, I read that when someone was cutting a big pipe, a cylinder was found inside the pipe. There must be several gas cylinders lying for several years in scrap yards and storage areas of several industries where we do not know the contents. They have to kept atleast in shaded areas till such time the history of the cylinders can be established. Else, they may leak after sometime because of exposure sun and rains. If someone is doing hot work near such cylinders not knowing about their presence, cylinders may explode and result in fatalities or injuries. Guidelines were issued by CSB for hot work and a video is available in the website (www.csb.gov) about hazards of hot work. Several videos of CSB are also available on Youtube.
What one can do to such incidents is to dispose the cylinders as soon as they arrive by use or neutraliztion or incineration as the case may be. If not possible, they should be stored properly and history cards maintained. For those cylinders already lying in the backyards for several years, we have to shift them to safe storage areas and efforts are to be put to trace the history. If contents and supplier name are readable from the cylinder, then we can dispose them in a suitable manner.
Disposal of gas cylinders is a major issue and is to be as per Gas Cylinder Rules. The scrolling news in a TV channel mentioned that BPT asked Controller of Explosives to dispose the seized cylinders and as there is no response, cylinders were left as such. Controller of Explosives is not the agency for disposal of cylinders. They are regulators to issue licences for storage and handling. It is not known why the cylinders were seized by customs. However, BPT should have asked the person (consignee) responsible for bringing the cylinders to dispose or BPT should have disposed and collected the charges. Disposal means what we can do?. Either give the cylinders to users of chlorine or neutralize the gas in controlled manner.
Apart from the above incident of leaving gas cylinders in scrap yard, few months back we read that radioactive sources belonging to Delhi University were found in the scrap yard of scrap collector. In a book, I read that when someone was cutting a big pipe, a cylinder was found inside the pipe. There must be several gas cylinders lying for several years in scrap yards and storage areas of several industries where we do not know the contents. They have to kept atleast in shaded areas till such time the history of the cylinders can be established. Else, they may leak after sometime because of exposure sun and rains. If someone is doing hot work near such cylinders not knowing about their presence, cylinders may explode and result in fatalities or injuries. Guidelines were issued by CSB for hot work and a video is available in the website (www.csb.gov) about hazards of hot work. Several videos of CSB are also available on Youtube.
What one can do to such incidents is to dispose the cylinders as soon as they arrive by use or neutraliztion or incineration as the case may be. If not possible, they should be stored properly and history cards maintained. For those cylinders already lying in the backyards for several years, we have to shift them to safe storage areas and efforts are to be put to trace the history. If contents and supplier name are readable from the cylinder, then we can dispose them in a suitable manner.
Jan 19, 2009
Why Gas cylinders should be kept in sun shade?
I read in Rules for gas cylinders that gas cylinders should be kept under sun shade, should not be exposed to direct sun light, the storage area should have good ventilation, etc. Though the reasons are known, i.e to avoid over pressurization due to the exposure to sun, I saw practically how over pressurization takes place in the cylinder when exposed to sun light directly.
Recently, I was on a visit to one of our sites under construction. After my visit to the construction site, at about 1230 hrs in the noon, I was going back to the office where I normally sit. I don't have permanent table and chair as I visit the site occasionally and there are permanent safety officers already appointed at site. On the way, I saw some argon cylinders stored on the road side under direct sun light, without valve caps. I enquired with the contractor nearby about the cylinders and I was told that they are empty and are to be sent to the supplier. On close observation, I found that the valve discharge nozzle is having some water (there was rain on previous night) and small bubbles were being formed continuously.
From this I understood that though the cylinder is empty, it is not 100% empty and some leftover gas in the cylinder is getting expanded due to rise in ambient temperature. As the valve is not totally closed, the expanded gas is leaking out as bubbles through the water in the discharge nozzle.
This clearly demonstrates that though we assume empty cylinders are safe, they are not actually 100% empty and if the gas is toxic, then the little amount of gas leaking out due to sunlight exposure can harm the persons nearby. If the cylinders are full then they are hazardous and can endanger the persons around.
Similarly, being found on the roadside, any damage to the valve (breakage) can rocket the cylinder like missile and can hurt persons / damage equipment or property nearby or can have a domino effect. For this reason, the rules are specific that the unused cylinder valves should be protected with valve caps so that valves can't be exposed directly.
People talk about safety culture so much, but these small issues like valve caps, cylinder storage under sunshade, chaining the cylinders to prevent their fall, etc are not given due attention. Lip service alone will not improve safety culture. May be, talking about safety will bring admiration from listeners and even some appreciation by way of reward, but this will not help in improving the safety at ground level and all this admiration / appreciation / rewards will be washed off by any single accident and the same persons will admonish the in-charges of the area for not visualizing the hazards and not taking corrective measures for the safety of the people.
Recently, I was on a visit to one of our sites under construction. After my visit to the construction site, at about 1230 hrs in the noon, I was going back to the office where I normally sit. I don't have permanent table and chair as I visit the site occasionally and there are permanent safety officers already appointed at site. On the way, I saw some argon cylinders stored on the road side under direct sun light, without valve caps. I enquired with the contractor nearby about the cylinders and I was told that they are empty and are to be sent to the supplier. On close observation, I found that the valve discharge nozzle is having some water (there was rain on previous night) and small bubbles were being formed continuously.
From this I understood that though the cylinder is empty, it is not 100% empty and some leftover gas in the cylinder is getting expanded due to rise in ambient temperature. As the valve is not totally closed, the expanded gas is leaking out as bubbles through the water in the discharge nozzle.
This clearly demonstrates that though we assume empty cylinders are safe, they are not actually 100% empty and if the gas is toxic, then the little amount of gas leaking out due to sunlight exposure can harm the persons nearby. If the cylinders are full then they are hazardous and can endanger the persons around.
Similarly, being found on the roadside, any damage to the valve (breakage) can rocket the cylinder like missile and can hurt persons / damage equipment or property nearby or can have a domino effect. For this reason, the rules are specific that the unused cylinder valves should be protected with valve caps so that valves can't be exposed directly.
People talk about safety culture so much, but these small issues like valve caps, cylinder storage under sunshade, chaining the cylinders to prevent their fall, etc are not given due attention. Lip service alone will not improve safety culture. May be, talking about safety will bring admiration from listeners and even some appreciation by way of reward, but this will not help in improving the safety at ground level and all this admiration / appreciation / rewards will be washed off by any single accident and the same persons will admonish the in-charges of the area for not visualizing the hazards and not taking corrective measures for the safety of the people.
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