20 www.morbros.com E E ENCY VENTS Emergency Vent 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 re. Description 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. Code Compliance When properly sized for the tank, this vent will conform to the requirements of NFPA 30, 30A, UL 142, UL 2244, ULC S601, API 2000, and PEI RP200. California Air Resources Board Phase I AST EVR. Material and Configuration Options Aluminum Body or Iron Body… suf x (I) indicates iron. Standard Seat ( Viton®)… suf x (O) indicates o-ring. EVR models are Viton® B. Male/Female NPT/BSP or Flanged Mounting Connection… suf x ( M) indicates male, and suf x (F) indicates anged. BSP threads available. Opening Pressure Setting… settings indicated are approximate. Screens... 4 mesh stainless steel screens available in 2". 3 mesh stainless steel screens available in 3", 4", 5", and 6". WA NIN 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. WA NIN 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, 749 or 922. se EV models to comply ith pressure decay test Contact actory or assistance Emergency vent should e set higher than the normal vent so the normal vent operates first Series WA NIN 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 & 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 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 Opening Pressure Ship Venting Mounting Fig. No. Size Setting Weight Capacity Connection ( oz/sq in) ( lbs) (* Est. CFH @ 2.5 PSI) O 4" 8.0 10.00 131,700 Female NPT 16.0* 18.00 103,799 Female NPT 5" 8.0 14.00 184,651 Female NPT 16.0* 27.00 184,651 Female NPT 6" 8.0* 19.00 278,660 Female NPT 16.0* 36.00 278,660 Female NPT 8" 8.0* 33.00 504,818 Female NPT 16.0* 62.00 504,818 Female NPT O 4" 8.0 11.00 131,700 Flanged 16.0 20.00 103,799 Flanged 6" 8.0 21.00 278,660 Flanged 16.0 38.00 278,660 Flanged 8" 8.0 33.00 504,818 Flanged 16.0 67.00 504,818 Flanged 10" 2.5 25.00 881,670 Flanged 8.0 57.00 881,670 Flanged 16.0 103.00 881,670 Flanged O 2" 8.0 1.0 31,917 Male NPT 16.0* 0.4 31,917 Male NPT 3" 8.0 7.00 60,994 Male NPT 16.0* 11.00 60,994 Male NPT 4" 8.0 10.00 131,700 Male NPT 16.0* 19.00 103,799 Male NPT 5" 8.0 15.00 184,651 Male NPT 16.0* 28.00 184,651 Male NPT 6" 8.0* 20.00 278,660 Male NPT 16.0* 37.00 278,660 Male NPT 8" 8.0* 34.00 504,818 Male NPT 16.0* 63.00 504,818 Male NPT Opening Pressure Ship Venting Mounting Fig. No. Size Setting Weight Capacity Connection ( oz/sq in) ( lbs) (* Estimated CFH @ 2.5 PSI) OI 4" 8.0 12.00 131,700 Female NPT 16.0 21.00 103,799 Female NPT 6" 8.0 22.00 278,660 Female NPT 16.0 39.00 278,660 Female NPT 8" 8.0 39.00 504,818 Female NPT O I 3" 8.0 8.00 60,994 Male NPT 4" 8.0 13.00 131,700 Male NPT 16.0 22.00 103,799 Male NPT 6" 8.0 26.00 278,660 Male NPT 16.0 43.00 278,660 Male NPT 8" 8.0 42.00 504,818 Male NPT 16.0 71.00 504,818 Male NPT Fig.244OM Fig.244O Fig.244OF * indicates EVR models available. NOTE: 4" CFH to increase to 131,700 in the second quarter of 2012.
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