Stack arrestors

The hazard tree also helps identify protection devices to include in equipment design that may minimize the possibility that a source will develop into a condition. Examples would be flame arrestors and stack arrestors on fire tubes to prevent flash back and exhaust sparks, gas detectors to sense the presence of a fuel in a confined space, and fire... 

Appropriate gas/vapour/fume/pressure venting, e.g. flame arrestors, scrubbers, absorbers, stacks Ensure adequate natural or forced general ventilation of the storage area Provide adequate, safe lighting... 

There are, however, two cases in which flame arrestors in vent stacks are justified ... 

The common theme of many of these items is that blowdown lines and flare and vent stacks should be kept simple because they are part of the pressure relief system. Avoid flame arrestors, molecular seals, water seals, and U-bends. Avoid steam, which brings with it laist and scale and may freeze. 

Spark arrestors are provided at those locations where sparks may constitute a hazard to the surrounding environment. The exhausts of internal combustion engines, incinerator stacks, and chimneys are normal examples. It usually consists of screening material to prevent the passage of sparks or flying brands to the outside atmosphere. 

Spark arrestors are provided on the exhaust of source or fire where a hot particulate might be released (i.e., internal combustion engines, chimneys, incinerator stacks, etc ). The spark arrestor consist of a fine metal screen to prevent the particulate matter from being released from the exhaust mechanism. 

The noncondensable gas separated in the distillation tower is passed through a water scrnbber to remove HCl if PVC is present. Then the NCG is contacted with refrigerated gasoline to condense some light fractions and finally the gas is passed through a flame arrestor to a burner in the flame stack. 

First, connect the gas supply line from the regulator to the fuel cell entry port barb connector. As a general practice, always have some sort of flashback arrestor between the regulator and the fuel cell stack. This can be a small flashback bubbler that you can construct and install, or you can use a commercial flash arrestor. 

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