MIL-STD-1411B
MASTER PAINTERS INSTITUTE (MPI)
MPI Reference 9 - Exterior Alkyd Enamel
(Copies of this document are available from https://www.paintinfo.com/mpi/ or from Painting & Decorating Contractors of America - National Office (PDCA), 3913 Old Lee Highway, Suite 33- B, Fairfax, VA 22030-2433.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. DEFINITIONS
3.1 Acetylene cylinders. Acetylene cylinders are fabricated in accordance with DOT 8 or DOT 8AL specifications. They are low-pressure cylinders limited in service pressure to
250 psig and equipped with PRDs that will melt at 212 °F to relieve internal pressure in case of excessive heat or fire. Acetylene is a flammable gas that will detonate on impact. Because of this property, the compressed acetylene gas must be finely divided and cushioned if safe handling is to be achieved. An efficient way to meet this requirement is to dissolve acetylene gas in a liquid. Acetone is the solvent of choice. For increased safety and to guard against separation of a volume of acetylene, the steel cylinder is filled with a porous inert material. An acetylene cylinder charged with acetone, under 250 psig pressure, will absorb up to 400 times the volume of the liquid acetone in acetylene gas.
3.2 Authorized repair and rebuild facilities. 49 CFR limits repair and rebuild activities very specifically. Repair and rebuilding can only be performed by a manufacturer of these types of DOT cylinders or by a repair facility approved by the Associate Administrator for Hazardous Materials Safety, U.S. Department of Transportation, Washington, DC 20590-0001.
3.3 Borescope. A borescope is an inspection device that can be of great assistance in inspecting questionable cylinders. This optical device, which is similar to a periscope, can, by a system of lenses, mirrors, and high intensity light, effectively place the eye inside the cylinder and even magnify the surface under inspection.
SAFETY PRECAUTION: Any light source that enters the cylinder must be one designed for use in an explosive environment.
3.4 Calibrated cylinder. A calibrated cylinder is a device used to insure that measurements made by cylinder testing equipment are accurate to an established standard. A calibrated cylinder is an instrument of calibration and must be handled with care to guard against dents, over-pressurizing, and corrosion.
3.4.1 Calibrated cylinder for hydrostatic testing. The calibrated cylinder used in hydrostatic testing is a cylinder that has been pre-stressed until the expansion pattern becomes
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