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PRASURE-VACUUM VEAS - - 548 & 548A748 & 748 A PRESSURE-VACUUM -# ESSURE-VACUUM VENT VENT WITH GAUGE HATCH For"normal"venting of Aboveground Stor- For"normal"venting of Aboveground Stor- age Tanks. Allows tank to"breath"during age Tanks. Allows tank to"breath"during filling and withdrawing operations.Pressure- filling and withdrawing operations.Pressure- vacuum poppets seal vapors in the tank when vacuum poppets seal vapors in the tank when pressure is equalized. This.vent must be pressure is equalized. This vent must be FIG 548 used in conjunction with an emergency vent FIG 748 used in conjuction with an emergency vent and it is RECOMMENDED that the opening and it is RECOMMENDED that the opening pressure setting is set below that of the emer- pressure setting is set below that of the emer- gency vent so the normal vent relieves first. gency vent so the normal vent relieves first. CONSTRUCTION DETAILS CONSTRUCTION DETAILS FIG 548...................Brass Body and Hood. FIG 748...................Stainless Steel Poppets. FIG 548 A................Aluminum Body and Hood. FIG 748 A...............Brass Poppets Standard Features: (Fig 748 available in 2.0 oz/sq in pressure-1.0 oz/sq in Vacuum only) 1. Brass(raised)metal-to-metal Seats/Poppets. Standard Features: 2. Threaded Gauge Hatch for manual gauging access. 1. Aluminum Body and Hood. 3. Horizontal Discharge and field-adjustable,tripolar orientation. 2. Horizontal Discharge with field-adjustable tripolar orientation. Size Pressure Vacuum Fig 548 Fig 548A Venting Size Pressure Vacuum Fig 748 Fig 748A Venting Setting Setting Ship Ship Capacity Setting Setting Ship Ship Capacity (oz/sq in) (oz/sq in) Weight Weight (CFH) (oz/sq in) (oz/sq in) Weight Weight (CFH) (LBS) (LBS) (@2.5 PSI) (LBS) (LBS) (@2.5 PSI) 2" 2.0 1.0 13.25 7.00 20,200 2" 2.0 1.0 13.25 7.00 20,200 2" 4.0 1.0 13.75 8.75 20,200 2" 4.0 1.0 NA 8.75 20,200 2" 6.0 1.0 14.25 8.50 20,200 2" 6.0 1.0 NA 8.50 20,200 -t 2" 8.0 1.0 14.75 9.50 20,200 2" 8.0 1.0 NA 9.50 20,200 j 2" 12.0 1.0 15.75 10.50 18,600 2" 12.0 1.0 NA 10.50 18,600 2" 16.0 1.0 17.00 11.25 18,000 2" 16.0 1.0 NA 11.25 18,000 l 3" 2.0 1.0 26.25 12.25 43,000 WARNING: Obstruction of airflow through vents can '� 3" 4.0 1.0 27.25 13.75 43,000 g 3" 6.0 1.0 28.25 15.00 43,000 result in structural deformation of the tank. Atmo- 3" 8.0 1.0 28.75 15.75 43,000 spheric conditions and below freezing temperatures 3" 12.0 1.0 29.25 15.75 40,000 may cause condensation to occur and freeze. Freezing 3" 16.0 1.0 33.25 20.50 40,000 y 9 action can restrict movement of poppets and block " screened air passages. Monthly inspection and more L 749 SERIES frequent inspection in cold weather by someone famil- iar with the proper operation of this vent is required to help guard against accidental damage to the tank. For PRESSURE-VACUUM further instructions contact: Morrison Bros. Co. VENT Dubuque Iowa(319)583-5701. Vent valve used on underground&low volume aboveground tanks for motor 748 ALT fueling. Vent allows tank to"breath" during filling/dispensing operations. Poppets seal vapors in the tank whenPRESSURE-VACUUM pressure is equalized. Settings are VENT FIG 749 approximate. Warning:FIG 749 PN Vent must only FOR AG-CHEMICAL CONSTRUCTION DETAILS be used in conjunction with motor Vent valve used with aqua-amonia and FIG 749-2"NPT fueling and/or low capacity flow.Fluid ag-chemical products allowing tank to handling in lines largerthan that used 'breathe"during loading/unloading op- FIG 749 S-2"Slip-on style for retail service station can cause erations. Poppets seal vapors in the FIG 748 ALT FIG 749 CRB-2"NPT tank to rupture or implode. tank when pressure is equalized. Set- tings are approximate. 4 C.A.R.B.approval(95-15A) Pressure Vacuum Ship Venting CONSTRUCTION DETAILS for Stage I and II.Viton 0-rings Setting Setting Weight Capacity Size....................................2"NPT on pressure poppet. (oz/sq in) (oz/sq in) (LBS) (CFH) Body and Cap...............Aluminum Pressure Vacuum Ship Venting (@2.5 PSI) Poppets.........Teflon Coated Alum Setting Setting Weight Capacity Body..................... Aluminum FIG 749&749 S Screens.................Stainless Steel Ibs/s m oz/s in ( q� )( 4� ) (LBS) (CFH) Pressure Poppet...Aluminum 8.0 0.5 1.0 8,500 (@2.5 PSI) Vacuum Po 12.0 0.5 1.0 8,500 ppet.......... Brass FIG 749 CRB Option: (Must specify) male 0.5 1.0 5.5 20,200 Seal........................... Buna-N 3"W.C. 8"W.C. 1.2 NPT connection for dryer appli- 1.0 1.0 5.5 18,000 Screen...........................Brass 8 oz. 5 oz. 1.2 cation. 2.0 1.0 6.0 NA 25