Deflagration test

An additional finding by Lapp and Vickers (1992) is that a change in pipe diameter (as above) has the largest detrimental effect during restricted-end deflagration testing. 

The deflagration flame arrester must he subjected to a series of at least 10 explosion (deflagration) tests in a rig with a pipe at least 5 feet (1.5 meters) long with various mixtures of propane in air and different test conditions to test the entire spectrum of possible deflagrations. Also, a series of 3 flashback tests, using a mixture of 4.2 volume percent of propane in air, must be conducted. 

Standard Test Rig Test Gas Deflagrations Test Pressure Endurance Burn Test... 

There is a need to have all accepted test standards require that deflagration testing he done with a restricted outlet. More research is needed to evaluate the effect of restriction size and location on flame arrester effectiveness. Not all test standards require this for deflagration testing. This is important since protected side restrictions severely reduce flame arrester capability. 

Verpuffungs-apparat, m. explosion apparatus, -motor, m. explosion engine, internal-combustion engine, -probe, /. deflagration test, -rohre, /. explosion tube. 

To estimate pressures resulting from a detonation and pressure piling, we estimate the original deflagration test pressure px using Equation 12-2 ... 

A substance or mixture is potentially capable of deflagration if it has a AHd greater than 250 cal/g (-1000 J/g), a "yes" in Box 8. Deflagration tests (Box 7) then should be carried out as well as tests for sensitivity to impact and friction. 

Specific explosibility tests are discussed in this section. It is emphasized that detonation tests in particular and a number of deflagration tests are of the type that must be run by experts in specialized facilities. 

Deflagration tests run under ambient pressure are relatively rudimentary. They provide information concerning only the propagation rate of deflagration after forced initiation. Examples of these tests are the UN deflagration test [143], dedicated to classification of organic peroxides, and the UN trough test [145], dedicated to classification of fertilizers. 

The UN deflagration test consists of a Dewar vessel with a volume of about 400 cm3. The vessel is filled with preheated material (standard temperature is 50°C if the stability of the substance permits), and the substance is initiated at the top of the vessel with a flame. The propagation of deflagration is recorded by temperature sensors that are located in the substance at preset distances. From the time required for passing two temperature sensors and from the known distance between them, the deflagration velocity can be calculated. 

The results obtained from deflagration testing are either pressure-time data or deflagration rates as a function of pressure and/or temperature. 

The liquid phase deflagration testing resulted in a temperature-concentration relation which divided the regimes at which the peroxide does and does not sustain a deflagration. This relation depended on the test tube diameter (2.5-cm and 7.6-cm tubes were used), and thus extrapolation of the diameter of interest is required. 

Heat Tests. Under this term may be placed all the stability tests which involve heating an explosive, eg Abel Heat Test, Acidity Measurements (pH measurements), American Test at 65.5° or 80°, Bergmann-Junk Test, Brame s Test, Brunswig s Test, Chiaraviglio Corbino Test, Conductivity Method (De Bruin de Pauw) Continuous Test, Deflagration Test, Desmaroux Test, Dupre s Vacuum Test, Dutch Test,... 

HESS, P. German scientist who designed several tests for explosives, such as Hess Crusher Test, Deflagration Test etc. Author of several publications on physical testing of explosives ... 

Jensen s Test is a combination of the deflagration test of Sy and the Abel Heat Test Ref Reilly (1938), pp 80 83... 

Deflagration Test or Deflagration Temperature Test. See Ignition Temperature Test in this section Deliquescence Test. See Hygroscopicity Test in this section Density Determinations will be discussed In Vol U, under D... 

Deflagration Test (Essai de defragration, in Fr). See under Ignition (or Explosion)... 

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