MIL-STD-1411 Inspection And Maintenance Of Compressed Gas CylindersThis standard defines the requirements and procedures for the inspection, maintenance, and charging of government-owned cylinders by gas suppliers. This standard is intended to assure that the cylinders are serviced to meet safety standards and to assure that the quality of the gas supplied is not degraded by a government container. This standard is also applicable to cylinders that require reconditioning, repair, and rebuilding to assure a level of renewal that meets the needs of the government and industry in gas handling. This standard is also to be a guide when cylinders are sorted, graded, and classified for storage, salvage, or disposal in depot facilities.

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MIL-STD-1411B

FOREWORD

1. This standard practice is approved for use by all departments and agencies of the

Department of Defense (DoD).

2. MIL-STD-1411B, "Inspection and Maintenance of Compressed Gas Cylinders", presents definitions, general requirements, and detailed procedures for the inspection, maintenance, and recharging of government-owned cylinders for the procurement of compressed gases. The standard presents guidelines that recognize and define precise variations from plant

to plant. It is a standard practice for the inspection and maintenance of compressed gas

cylinders, which are defined in procurement specifications that may present confusing or unclear inspection and maintenance methods. It is intended to resolve problems encountered by compressed gas suppliers and government procurement and inspection activities in agreeing on acceptable procedures for servicing compressed gas containers.

3. MIL-STD-1411B addresses receiving and serviceability inspection and sets standards for acceptance and rejection of gas cylinders. It establishes procedures for internal and external maintenance. It classifies and details the recharging of cylinders and the purging and evacuating of air and residual gas from previous charging. Details are presented as guidelines for cylinder handling.

4. Instructions are given for condemnation and disposal of cylinders declared to be unfit for further use as pressure vessels.

5. The intent of this document is to provide government agencies and the compressed gas industry supporting the government with a standard practice for cylinder inspection and maintenance that is compatible with government requirements as well as industry practice.

6. This revision has resulted in many changes but the most significant are:

a. Revised sections of this document, where applicable, to include the use of ultrasonic examination (UE) for compressed gas cylinder inspection and maintenance. The primary focus of this revision was to prescribe which instances UE may or may not be used in lieu of the currently required hydrostatic testing, as well as any additional inspection or preparatory requirements necessary to insure continued safe use, reliability and cylinder longevity.

b. Added paragraph 5.3.2.1, requiring cylinder neck threads to be cleaned upon the removal of a valve and prior to any subsequent process.

c. Revised paragraph 5.3.2.6.3 to limit the use of anti-seize thread compound for valve installation and require valve inlet threads to be cleaned prior to applying tape or thread compound.

d. Revised paragraph 5.4.1 to increase the required number of pre-charging evacuations for cylinders in aviator breathing oxygen (ABO) service to three.