Thursday, March 17, 2011

Replacing Damaged Cylinders

Fire Protection in Industrial applications can be dangerous work, using large equipment to get the job done creates opportunities for accidents. Over the years we have seen many damaged cylinders come through our shop. From fire extinguishers to system cylinders one thing holds true. If a pressurized cylinder has been dented it shall be condemned.

NFPA-10 2007 Edition States:

 8.4.2 Examination of Cylinder Condition. Where a fire extinguisher cylinder or shell has one or more of the following conditions, it shall not be hydrostatically tested but shall be condemned or destroyed by the owner or at the owner's direction:

(1)       Where repairs by soldering, welding, brazing, or use of patching compounds exist

(2)       Where the cylinder threads are worn, corroded, broken, cracked, or nicked

(3)       Where corrosion has caused pitting, including pitting under a removable nameplate or name band assembly

(4)       Where the fire extinguisher has been exposed to excessive heat, flame, or fire

(5)       Where a calcium chloride–type extinguishing agent was used in a stainless steel fire extinguisher

(6)       Where the shell is of copper or brass construction joined by soft solder or rivets

(7)       Where the depth of a dent exceeds of the greatest dimension of the dent if not in a weld or exceeds ¼ in. (6 mm) if the dent includes a weld

(8)       Where any local or general corrosion, cuts, gouges, or dings have removed more than 10 percent of the minimum cylinder wall thickness

(9)       Where a fire extinguisher has been used for any purpose other than that of a fire extinguisher

The Danger lies in that the metal becomes fatigued when it is bent, or dented. Being a pressurised cylinder the chance of the weakened metal rupturing is greatly increased, and so are the chances of a person being hurt if they are in close proximity if the cylinder should burst. Keep in mind most fire protection cylinders have pressures beginning at 195 lbs., and escalating from there.

If you have a damaged cylinder, call your service provider so that we can remove the cylinder, and discharge it in a safe controlled environment.


Crushed by a CatSide ViewBack View




Posted by Rob Read at 2:54 PM


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