From: Benjamin G Owens <bowens**At_Symbol_Here**UNR.EDU>
Subject: Re: [DCHAS-L] Gas Cylinder Hydrostatic Testing
Date: Wed, 5 Feb 2014 15:02:01 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 852F486739ECB34484E384E1D009D97D0346EBA5**At_Symbol_Here**

Just to summarize the responses, regulations allow a compressed gas cylinder that was filled before expiration of its hydrostatic test date to remain in service until it is emptied and such a cylinder with an expired test date can be transported (e.g., to be tested and refilled).  Of course prudent practice dictates that cylinders that have been damaged or subjected to extreme stress of any kind be inspected/tested sooner. 


Thank you to everyone who responded.


Ben Owens


From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Dan Kuespert
Sent: Wednesday, February 05, 2014 3:45 AM
Subject: Re: [DCHAS-L] Gas Cylinder Hydrostatic Testing


While, as the fellow from Airgas (and others) pointed out, it is legal to transport and generally safe to continue to use the cylinder after its expiry date (probably—assuming the user hasn’t used it for target practice!), I still like to point to the need for recertification with our labs because it helps me encourage them to get rid of cylinders they’ve had since 1982 (really!) and consequently it reduces demurrage charges for cylinders kept for 32 years. 





Daniel R. Kuespert, Ph.D.

Homewood Laboratory Safety Advocate

Krieger School of Arts & Sciences/G.W.C. Whiting School of Engineering

The Johns Hopkins University

Shaffer Hall 103G

3400 N. Charles St.

Baltimore, MD 21218

(410) 516-5525



On 2/4/14, 8:54 PM, "Benjamin G Owens" <bowens**At_Symbol_Here**UNR.EDU> wrote:




I understand that compressed gas cylinders must have a current hydrostatic test to be filled.  I have read a vendor site that indicates that a cylinder may be transported after the hydrostatic test expiration date if it was filled prior to the expiration date.  If cylinders that have exceeded the hydrostatic test date are considered safe to transport are they considered safe to continue using?  In other words, if a compressed gas cylinder is not empty but has exceeded the hydrostatic test expiration date is it required by regulation or prudent practice to be returned for testing or can it continue to be used? 






Ben Owens

Assistant Director, Laboratory Safety

University of Nevada, Reno

EH&S Dept., MS 328

Reno, NV 89557

775-327-5196 (office)

775-843-2113 (cell)



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