Door to Compressed Gas Storage Rooms

Q: I have an oxygen/med gas storage room that is attached to the hospital, and can only gain access to the room by way of the exterior of building. Does the room have to have a fire-rated door assembly?

A: Well… that depends. If the storage room contains 3,000 cubic feet or more of compressed medical gases, and the room is located indoors, then the room must be constructed with 1-hour fire-rated construction and the door to the room is required to be 1-hour fire rated if new construction, and 3/4-hour rated if existing conditions. (See of NFPA 99-2012).

However, the intent of is to separate the compressed gas storage room from the rest of the facility by requiring 1-hour fire rated barriers, and if the door opening to the storage room opens into the facility, one could easily understand why a fire-rated door is required. However, if the door to the storage room opens to the outdoors (i.e. receiving dock) then one could make a point that the door is not required to be fire-rated, because there is no separation between the storage room and the rest of the facility at that point.

But the problem is, NFPA 99-2012 section does not say that and does not appear to have any exception for a door to the storage room that opens to the outdoors. I think a rational, smart, understanding surveyor would agree with that point and not cite you for not having a fire-rated door that opens to the outdoors.

But will you always have a rational, smart, and understanding surveyor?

Compressed Flammable Gas

Q: Can we store compressed butane gas cylinders used for food-warming and heating in the kitchen or do they require special storage?

 A: NFPA 30 requires all flammable gases and liquids exceeding 1 gallon (aggregate total) must be stored in a proper fire rated cabinet, or in a hazardous room with 1-hour fire rated barriers. You are not allowed to store mixed substances, such as combustibles with flammable liquids and gasses. For quantities less than 1 gallon, they must be stored in their original container, or in a special safety can. Joint Commission does have a standard (EC.02.01.01) whereby they could cite you for having any flammable liquid or gas stored outside a fire rated cabinet regardless of the quantity.  

Oxygen Cylinders

Q: Several of our department have stretchers with onboard E-size oxygen cylinders.  Can these be considered “in use” and not count against the smoke compartment’s 300 cubic feet limit? Also, our nursing staff currently checks oxygen inventory daily and documents it on a log.  Is this a written code requirement?

A: Yes and No. All O2 cylinders that are mounted on gurneys, wheelchairs and medical equipment but are not actively used by patients are considered by CMS to be in use, and therefore are not subject to the 300 cubic feet threshold for stored medical gas cylinders. They explained their position on this issue in a memorandum called S&C-07-10, dated January 12, 2007. The Joint Commission has endorsed this position as well and has said as much at various opportunities.  In regards to the nurses checking oxygen levels on a daily basis, I am not aware of any LSC or Joint Commission requirement for this action. Perhaps there may be something about this from the state. I do know that plant operators frequently record the level of liquid oxygen in the bulk storage tanks but that is more for tracking purposes and to ensure they do not run out.

Compressed Gas Cylinders in Business Occupancies

I was recently asked what the requirements were for storing compressed gas cylinders in a business occupancy. According to section 1-2, NFPA 99 (1999 edition) applies to all health care facilities, and section 2-1 defines a health care facility where medical care is provided. Therefore a clinical business occupancy such as those which provides services for cardiac rehab, physical therapy, physician’s office, and pulmonary rehab programs is considered to be a health care facility. Assuming you are either Joint Commission accredited, or receive federal reimbursement monies for Medicare or Medicaid services, you are required to comply with NFPA 99 (1999 edition) Health Care Facilities standard.

Chapter 13 in NFPA 99 is the chapter for “other” health care facilities which are not hospitals, nursing homes and limited care facilities. Section 13-3.8 requires all gas equipment to conform to chapter 8. Section 8-3.1.11 lists the storage requirements for nonflammable gases greater than 3000 cubic feet and quantities less than 3000 cubic feet which are similar (but not the same) as those requirements for hospitals.

For storage of quantities of nonflammable gas greater than 3000 cubic feet, the requirements are the same as those for hospitals, which are found in section 4- of NFPA 99. However, for quantities less than 3000 cubic feet, there is a difference in storing nonflammable gas cylinders is in the 300 cubic feet or less quantity. Hospitals have the advantage of having a special dispensation granted by The Centers for Medicare & Medicaid Services (CMS), in the form of S&C Letter 07-10, published January 12, 2007. In this letter, CMS allows hospitals (but not medical offices or clinics) the advantage of following the 2005 edition of NFPA 99, which permits quantities up to 300 cubic feet of nonflammable gas per smoke compartment to not be stored in any special rooms or areas. This exception for ‘up to 300 cubic feet’ is not found in the 1999 edition of NFPA 99. Therefore, your business occupancy must store all nonflammable gas cylinders in quantities from 0 to 3000 cubic feet in accordance with section 8-, which requires a specially designated room which has a door capable of being locked, and all oxidizing gases in this room must be separated from combustibles by 20 feet (or 5 feet if the room is protected with automatic sprinklers), or the oxidizing gases are to be stored in a flammable cabinet with a fire rating of at least 30 minutes.

Compressed Gas Stored in Dialysis Unit

Q: We have a contractual Dialysis Unit on the 2nd Floor of our Medical Office Building which consists mainly of one large open room. Very often in the treatment area they have more than 12 ‘E’ size cylinders of oxygen stored, that are not in use. Does the 12 cylinder rule apply to them even though they are an ambulatory care occupancy?

A: By saying the 12 cylinder rule, you are referring to the NFPA 99 requirement that requires quantities of compressed medical gas that exceed 300 cubic feet per smoke compartment to be stored in a designated room that has 30 minute fire rated walls, a door with a lock on it, and kept separate from combustibles by 20 feet (5 feet if the room is sprinklered). 12 full ‘E’ size cylinders contain slightly less than 300 cubic feet of compressed gas, so 12 ‘E’ size cylinders per compartment could be stored outside of the designated room, but once there are 13 of them, then they would all have to be stored in the designated room. The healthcare occupancy chapters in the LSC do require compliance with NFPA 99 in regards to medical gas storage (see, but the ambulatory care occupancy chapters (20 and 21) do not. But that is not the end of the story. Oxygen by itself is not a flammable gas, but it can make other items burn faster and at a lower temperature. Therefore, it is considered a hazard, and must be protected in a room designated as a hazardous room. But at what point does the quantity of compressed oxygen stored in the cylinders becomes a hazard? If this were healthcare occupancy, the answer to that question is made for us by NFPA 99 which sets a threshold of 300 cubic feet of compressed gas. But that standard is not listed as a requirement in the ambulatory care chapter of the LSC, so the authority having jurisdiction (AHJ) will have to decide for themselves what standard to use. I suggest you follow NFPA 99 requirements for oxygen cylinder storage until such time an AHJ says otherwise.

Securing Compressed Gas Cylinders

Q: At our hospital, we have differing opinions concerning the proper method to restrain compressed gas cylinders. Would you please provide us the code reference regarding the correct method to secure compressed gas cylinders? Some of us say the cylinders are permitted to be restrained in a group with a single chain, and others say they have to be individually secured. Which is correct?

A: The issue of securing compressed gas cylinders is widely misunderstood. This is because at one time the technical committee for NFPA 99 themselves were not sure what they wanted. In one edition they allowed a group chain around all the cylinders then in another edition they required individual racks or chains per cylinder. It appears they eventually got back to allowing a group chain in the 2005 edition, but for those of us who are stuck on the 2000 edition of the Life Safety Code (LSC), the 1999 edition of NFPA 99 is the edition that we must follow. Section 4- of NFPA 99 (1999 edition) states “Provisions shall be made for racks or fastenings to protect cylinders from accidental damage or dislocation”. Also, section 4- states: “Cylinders in storage shall be secured and located to prevent them from falling or being knocked over”. None of these references mandates individual racks or chains for each cylinder, so the conclusion is a single chain that secures a group of cylinders is permitted, PROVIDED the chain is effective and prevents every cylinder from falling or being knocked over. Make sure the chain does not ‘loop’ too low to the floor where it is ineffective in preventing the cylinders from falling over.

Looking ahead to the 2012 edition of NFPA 99 (when it will be eventually adopted by the authorities), we find section which has this requirement for cylinder storage: “Freestanding cylinders shall be properly chained or supported in a proper cylinder stand or cart.” Even though the authorities having jurisdiction (AHJ) have not adopted the 2012 editions of the Life Safety Code, or NFPA 99, it is clear that the new edition of NFPA 99 will not have any surprises involving compressed gas cylinder restraints.

Medical Gas Cylinder Storage Room

Q: Our gas storage room has little mini-helium tanks which are full and under pressure. Are these tanks required to be restrained in the same way that the larger ‘E’ size cylinders are? The same room has a lot of O2 and CO2 tanks secured and stored. Is this room considered a hazardous room and does the door require a closer in existing healthcare occupancy?

A: Yes, the mini-helium tanks have to follow the same regulations as the larger compressed gas cylinders, and need to be properly secured. In regards to hazardous room… not necessarily. Once the total aggregate volume of non-flammable compressed gas exceeds 3,000 cubic feet, then the room has to be 1-hour fire rated and of course, the door would have to be fire-rated, positive latching and self-closing. If the quantity of compressed gas exceeds 300 cubic feet, but is less than 3,000 cubic feet, then the cylinders need to be stored in a designated room with 30-minute fire rated walls, have a lockable door and all cylinders must be separated from combustibles by 20 feet, or by 5 feet if the room is protected with automatic sprinklers.