Deflagration venting

Locate deflagration vents so discharge from them will not endanger personnel or damage equipment. [Pg.2319]

Design ventilation system to keep flammable concentration below lower flammable limit Provide on-line flammable gas detection and activation of inerting system Install automatic sprinkler system Install deflagration vents... [Pg.50]

Provide automatic sprinkler system/inerting gas Provide deflagration vents Provide deflagration suppression system Monitor flammable atmosphere/fire Provide nitrogen blocks (nitrogen injection to stop flame propagation) or other explosion isolation measures... [Pg.51]

Provide automatic sprinkler system Use deflagration vents... [Pg.84]

Deflagration venting (see NFPA 68) is highly applicable to powder operations. This is because most powder operations are at atmospheric pressure, the rate of deflagration pressure rise is usually small enough for vent relief panels to be of a practical size, and the subsequent fire is limited because most powders cannot bum in bulk. [Pg.195]

Procednres for the sizing and design of deflagration vents for pipes and dncts operating at or near atmospheric pressnre (np to 3 psig) are presented in Chapter 8 of NFPA 68 (NFPA 1998). [Pg.28]

Deflagration vents shonld be located close as possible to ignition sonrces where these sonrces can be identified. [Pg.28]

In order to nse the correlations presented later in the gnide, the weight of the deflagration vent closnres shonld not exceed 2.5 Ib/ft-(12.2 kg/m-) of free vent area. [Pg.28]

Deflagration vents shonld discharge to a location that cannot endanger personnel. [Pg.28]

When deflagration venting is nsed, a major hazard of concern is the fireball (flame clond consisting of bnrning gases and/or dnst) discharged from the vent. This can cause harm to personnel or process eqnipment and... [Pg.28]

Flame Front Diverter A device that opens in response to the pressure wave preceding the flame front of the deflagration, venting the flame front and pressure wave. [Pg.201]

Figure 7-63A. Venting nomograph for methane. Reprinteed with permission, NFPA 68-1988, Deflagration Venting, (1988) National Fire Protection Association, Quincy, MA 02269. Note This materiai is not the complete and official position of the National Fire Protection Association on the referenced subject, which is represented only by the standard in its entirety. Note from this author this statement applies to all material referenced for use that originates with the National Fire Protection Association [27].

Figure 7-63B. Venting nomograph for propane. Reprinted with permission, NFPA 68-1988, Deflagration Venting, (1988) National Fire Protection Association, Quincy, MA 02269. See note Figure 7-63A.

Interpolation of exisdng nomographs to determine deflagration vent area of different gas-air mixtures ... [Pg.510]

Note Kg values are not constant and vary with te.st conditions. Kg provides means of comparing maximum rates of pressure rise for various gases, but should only be used for deflagration vent sizing if test data comes from test vessels... [Pg.510]

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