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{short description of image}     MORRISON BROS - EMERGENCY VENTS
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Emergency Vent

Figure 244
Figure 244
Figure 244M

Figure 244M
  Figure 244F

Figure 244F
  Emergency vent (pressure relief only) used on aboveground storage tanks, as a code requirement that helps prevent the tanks from becoming over-pressurized and rupturing if exposed to fire. UL listed except for 2".

Figure 244 - The 244 Emergency Vent consists of a body and a black powder coated cover (2" not powder coated) that moves up and down on a center pin. Pressure inside the tank forces the cover to lift up off the vent seat, allowing air to exhaust. The center pin guides the movement. When pressure falls, the cover lowers back down onto seat and the vent is automatically reset.

When properly sized for the tank, this vent will conform to the requirements of NFPA 30, 30A, UL 142, UL 2244, API 2000 and PEI RP200.
In sizes from 2" to 10".

Also available:
  • Aluminum or Iron Body - (I) denotes iron
  • Metal-to-metal Seat (brass) or Soft Seat (Viton®) - (O) denotes o-ring
  • Male/Female NPT/BSP (M) or Flanged Mounting Connection (F)
  • Opening Pressure Settings
  • Tall Body (T) - 8" only; order for use on tite wrapped tank.

Download Product Specifications (PDF):
2", 3" & 4" Models  6" Model 8" & 10" Models

The 244 Emergency Vent is for "emergency pressure relief only" and must be used in conjunction with a "normal vent" or pressure vacuum vent such as a Morrison Fig. 354, 548, 748 or 749.

The 244 Emergency Vent must be properly sized and selected for each specific tank application in order to meet the proper "venting capacity" requirements. See the Morrison Vent Guide for further instructions.

Do not fill or unload fuel from a storage tank unless it is certain that the tank vents will operate properly. Morrison tank vents are designed only for use on shop fabricated atmospheric tanks which have been built and tested in accordance with UL 142, NFPA 30 & 30, 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 proper operation. Any restriction of airflow can cause excessive pressure or vacuum to build up in the storage tank, which can result in structural damage to the tank, fuel spillage, property damage, fire, injury and death. Monthly inspection, and immediate inspection during freezing conditions, by someone familiar with the proper operation of storage tank vents, is required to insure venting devices are functioning properly before filling or unloading a tank. Normal vents such as pressure vacuum and updraft vents for aboveground storage tanks should be sized according to NFPA 30 (2008) 21.4.3

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