Source: http://www.law.cornell.edu/cfr/text/33/part-154/appendix-A?qt-cfr_tabs=3
Timestamp: 2014-03-07 16:17:53
Document Index: 10255584

Matched Legal Cases: ['art 154', 'art 154', 'art 154', 'art 154', 'art 154', 'art 154']

33 CFR Part 154, Appendix A to Part 154 - Guidelines for Detonation Flame Arresters | LII / Legal Information Institute
CFR › Title 33 › Chapter I › Subchapter O › Part 154 › Appendix A 33 CFR Part 154, Appendix A to Part 154 - Guidelines for Detonation Flame Arresters
Appendix A to Part 154—Guidelines for Detonation Flame Arresters
This appendix contains the draft ASTM standard for detonation flame arresters. Devices meeting this standard will be accepted by the Commandant (CG-522).
1.1This standard provides the minimum requirements for design, construction, performance and testing of detonation flame arresters.
2.1This standard is intended for detonation flame arresters protecting systems containing vapors of flammable or combustible liquids where vapor temperatures do not exceed 60 °C. For all tests, the test media defined in 14.1.1 can be used except where detonation flame arresters protect systems handling vapors with a maximum experimental safe gap (MESG) below 0.9 millimeters. Detonation flame arresters protecting such systems must be tested with appropriate media (the same vapor or a media having a MESG no greater than the vapor). Various gases and their respective MESG are listed in attachment 1.
2.2The tests in this standard are intended to qualify detonation flame arresters for all in-line applications independent of piping configuration provided the operating pressure is equal to or less than the maximum operating pressure limit specified in the manufacturer's certification and the diameter of the piping system in which the detonation arrester is to be installed is equal to or less than the piping diameter used in the testing.
Detonation flame arresters meeting this standard as Type I devices, which are certified to be effective below 0 °C and which can sustain three stable detonations without being damaged or permanently deformed, also comply with the minimum requirements of the International Maritime Organization, Maritime Safety Committee Circular No. 373 (MSC/Circ. 373/Rev.1).
3.1ASTM Standards 1
A395 Ferritic Ductile Iron Pressure-Retaining Castings For Use At Elevated Temperatures.
F722 Welded Joints for Shipboard Piping Systems
3.2ANSI Standards 2
B16.5 Pipe Flanges and Flanged Fittings.
3.3.1ASME Boiler and Pressure Vessel Code 2
Section IX, Welding and Brazing Qualifications.
3.3.2International Maritime Organization, Maritime Safety Committee 3
MSC/Circ. 373/Rev. 1—Revised Standards for the Design, Testing and Locating of Devices to Prevent the Passage of Flame into Cargo Tanks in Tankers.
3.3.3International Electrotechnical Commission 4
Publication 79-1—Electrical Apparatus for Explosive Gas Atmospheres.
4.1Δ P/Po—The dimensionless ratio, for any deflagration and detonation test of 14.3, of the maximum pressure increase (the maximum pressure minus the initial pressure), as measured in the piping system on the side of the arrester where ignition begins by the device described in paragraph 14.3.3, to the initial absolute pressure in the piping system. The initial pressure should be greater than or equal to the maximum operating pressure specified in paragraph 11.1.7.
4.2Deflagration—A combustion wave that propagates subsonically (as measured at the pressure and temperature of the flame front) by the transfer of heat and active chemical species to the unburned gas ahead of the flame front.
4.3Detonation—A reaction in a combustion wave propagating at sonic or supersonic (as measured at the pressure and temperature of the flame front) velocity. A detonation is stable when it has a velocity equal to the speed of sound in the burnt gas or may be unstable (overdriven) with a higher velocity and pressure.
4.4Detonation flame arrester—A device which prevents the transmission of a detonation and a deflagration.
4.5Flame speed—The speed at which a flame propagates along a pipe or other system.
4.6Flame Passage—The transmission of a flame through a device.
4.7Gasoline Vapors—A non-leaded petroleum distillate consisting essentially of aliphatic hydrocarbon compounds with a boiling range approximating -65 °C/75 °C.
5.1The two types of detonation flame arresters covered in this specification are classified as follows:
5.1.1Type I—Detonation flame arresters acceptable for applications where stationary flames may rest on the device.
5.1.2Type II—Detonation flame arresters acceptable for applications where stationary flames are unlikely to rest on the device, and further methods are provided to prevent flame passage when a stationary flame occurs. One example of “further methods” is a temperature monitor and an automatic shutoff valve.
6.1Orders for detonation flame arresters under this specification shall include the following information as applicable:
6.1.1Type (I or II).
6.1.2Nominal pipe size.
6 1.3Each gas or vapor in the system and the corresponding MESG.
6.1.4Inspection and tests other than specified by this standard.
6.1.5Anticipated ambient air temperature range.
6.1.6Purchaser's inspection requirements (see section