From: ILPI Support <info**At_Symbol_Here**>
Subject: Re: [DCHAS-L] Gas Cylinder Hydrostatic Testing
Date: Tue, 4 Feb 2014 21:26:19 -0500
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: FD2560D2-A6FF-4A45-B1B4-33D443B0B933**At_Symbol_Here**
In-Reply-To <852F486739ECB34484E384E1D009D97D0346C7B0**At_Symbol_Here**>

Here's a quick summary at Grainger - according to this, most steel and aluminum cylinders have an indefinite service life until they fail a hydro test:

See 49 CFR 108.205,  General requirements for requalification of specification cylinders.  ( )

(c) Periodic requalification of cylinders. Each cylinder bearing a DOT specification marking must be requalified and marked as specified in the Requalification Table in this subpart. Each cylinder bearing a DOT special permit number must be requalified and marked in conformance with this section and the terms of the applicable special permit. No cylinder may be filled with a hazardous material and offered for transportation in commerce unless that cylinder has been successfully requalified and marked in accordance with this subpart. A cylinder may be requalified at any time during or before the month and year that the requalification is due. However, a cylinder filled before the requalification becomes due may remain in service until it is emptied. A cylinder with a specified service life may not be refilled and offered for transportation after its authorized service life has expired.

Rob Toreki

Safety Emporium - Lab & Safety Supplies featuring brand names
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On Feb 4, 2014, at 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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