24 www.morbros.com FLAME ARRESTERS 351 S & 748A Flame Arrester Used in conjunction with an emergency vent on aboveground storage tanks. Open (non-pressure type) - vent the transmission of heat and/or an ignition source into the tank. *:6 Body…cast iron Cover…cast iron Cap…brass Arrester Plates…stainless steel ) *) :* 1. Gauge opening cap. 2. Vapor relief capacity at 2.5 PSI = 22,000 CFH \ * 6 ) * } ? $ + < ! $ < @ + $ + ! such as gasoline in air. 2. Routine inspection is required to ensure airways are clear and free of debris. Blocked airways can cause structural deformation of the tank. Fig. 351S Flame Arrester With 748A Pressure Vacuum Vent… used in conjunction with an emergency vent on aboveground storage tanks. Pressure type - vent the transmission of heat and/or an ignition source into the tank. Fig. 748A… same vent featured in pressure/ vacuum vent section. *:6 Fig.351S… Flame arrester Fig. 748A… Pressure/vacuum vent 354 ^ 6 < L M L % M L ZM A! & $ +?$& ! & $ +?$& 2! $& $ +&&& >! $ ? + && 354 T ! & $ +?$& 2! $& $ +&&& Fig. 351S w/748A Updraft Vent “ Open” vent used on underground and aboveground tanks for motor fueling. Vent allows tank to “breathe” $ ^ operations. Fig. 354T… compatible with ? *:6 Body…aluminum; 354T is Cap…aluminum; 354T is Screen…40 mesh brass; 354T stainless steel screen. > ^ #* :* ^ 6::' 6 < L ZM L @ d M L @ d M L % M L $ # M ! & & > && $+$&& > & & > $& $+$&& ? & & > $ $+$&& & & >2 $& $+$&& & & >> $& 2 +&&& ? & & >$ $ 2 +&&& Double Outlet Vent Aluminum T-style vent used primarily on small fuel oil storage tanks. Outlet ports on either side of the inlet with 20 mesh stainless steel screen keeps debris out of the airway. Fig. 155… threaded (NPT) Fig. 155BSP…2" with British Pipe Threads Fig. 155FA Fig. 155S… slip-on NOTE… = , , : * * 6 ) = * ; * ):6 Fig. 354 Size Weight D! $ % ! $& % E! $& % A! $ % ! & % 2! $ % Size Weight 2" NPT 31.0 lbs Fig. 155S NOTE… = , , : * * 6 ) = * ; * ):6 351 S 354 155 S WARNING…? $ $ $ + & are designed only for use on shop fabricated atmospheric tanks which have been built and tested in accordance with UL 142, NFPA 30 & 30A, and API 650 and in accordance with all applicable local, state and federal laws. In normal operation, dust and debris can accumulate in vent openings and block air passages. Certain atmospheric conditions such as a sudden drop in temperature, below freezing temperatures, and freezing rain can cause moisture to enter the vent and freeze which can restrict internal movement of vent mechanisms and block air passages. All storage tank vent air passages must be completely free of restriction and all vent mechanisms must have free movement in order to insure K + $ @ $ $$ !$ $ < $ $ - $ < $ < + < < $ +< & + < $ = conditions, by someone familiar with the proper operation of storage tank vents, is required to insure venting devices are functioning properly ! $ $ $ $$ $ ! $ $ ! = according to NFPA 30 (2008) 21.4.3 OPEN VENTS
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