In many instances, emergency venting is provided through pressure relieving devices such as weighted cover style emergency vents, loose manhole covers, rupture or burst disks, remote-actuated relief devices, or other pressure relieving equipment that may be used in place of pressure relieving tank designs. Although less recognized, in legacy installations the weak roof-to-shell seam construction technique may be used as emergency venting. Remember that in double-walled tanks, equal capacity venting must be provided for both the primary tank and the secondary containment vessel.

  http://www.usfa.fema.gov/downloads/pdf/coffee-break/cb_fp_2013_9.pdf<;/object>

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