COVER EQUIPMENT. VAREC BIOGAS 400W Series EMERGENCY RELIEF MANHOLE COVERS

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1 COVER EQUIPMENT VAREC BIOGAS 400W Series EMERGENCY RELIEF MANHOLE COVERS The 400W Series is designed to provide emergency pressure and/or vacuum relief in storage tanks and vessels. Introduction The Varec Biogas 400W Series is designed to provide emergency pressure venting and vacuum relief in storage tanks and vessels, while allowing easy access for tank inspection and maintenance. Operation The constant mixing of the biosolids in the digester creates excessive foam build-up, which has the potential to clog digester cover equipment. The foam could clog the flame arresters installed with the Pressure and Vacuum Relief (PVR) Valves, especially without proper and routine maintenance. This leaves the PVR valves unable to perform their intended function of emergency pressure and vacuum relief. Without a secondary safety net, the tank is susceptible to explosion and implosion as pressure or vacuum rises in the tank. As the set pressure is reached, the cover initially floats on the seating area and then lifts to relieve the over-pressure. The hinged design allows for automatic re-seating of the cover once normal operating conditions have been restored. For vacuum relief, a spring-loaded vacuum relief valve is provided that will relieve the vacuum condition in the vessel. Pressure Only Design Features The unit is provided with interchangeable components to ensure standard parts are easily maintained and replaced. All products are factory tested and fully certified. All products are designed to ensure that condensate drains away from all seating areas. Standard seating design ensures maximum leakage of less than 1 scfh at 90% of set pressure. Technical Data Pressure & Vacuum Self Draining Hinged Pivot Design for Automatic Re-Seating Combination Emergency Pressure and Vacuum Relief Available (18 and larger sizes only) Size Range: 10 (250mm), 12 (300mm), 16 (400mm), 18 (450mm), 20 (500mm), 24 (600mm), 30 (750mm) & 36 (900mm) Minimum Leakage Rate 1

2 Specifications Size Range 10 (250mm), 12 (300mm), 16 (400mm), 18 (450mm), 20 (500mm), 24 (600mm), 30 (750mm), 36 (900mm) Standard Pressure Settings 2-60 WC (0.5 kpa - 15 kpa) Available pressure setting range is shown on part number ordering information. Vacuum Set Range 2-20 WC (0.5 kpa - 10 kpa) Combined Pressure & Vacuum Models Only available in 18 and larger sizes Flange Connections API 650 or ANSI 150 lbs. Flat Face (Aluminum) RF Flanges (Steel and Stainless Steel) Special Flange Drilling Available Upon Request Pressure Only Dimensions and Weights, inches [mm] and lbs. (kg) Size Code A B Hole # Hole Ø Shipping Weight (AL) Shipping Weight (CS/SS) 16 [406] 14 1 / 4 [362] 12 1 [25] 51 (23) 106 (48) 19 [483] 17 [432] 12 1 [25] 60 (27) 128 (58) 23 1 / 2 [597] 21 1 / 4 [540] / 8 [29] 74 (34) 165 (75) 25 [635] 22 3 / 4 [578] / 4 [32] 79 (36) 177 (80) 27 1 / 2 [699] 25 [635] / 4 [32] 86 (39) 196 (89) 32 [813] 29 1 / 2 [750] / 8 [35] 103 (47) 239 (108) 38 3 / 4 [985] 36 [915] Flanges supplied in accordance with ANSI / API 650. Other flange standards available on request. Flanges are drilled only / 8 [35] 137 (62) 329 (149) 46 [1169] 42 3 / 4 [1086] / 8 [41] 167 (76) 408 (185) 1 2 C Materials of Construction 1. Hinged Arm SS 2. Cover CS/ SS/ AL 3. Base CS/ SS/ AL 4. Gasket Neoprene 5. Drip Ring SS/ AL 6. Pressure Diaphragm PTFE 7. Diaphragm Seat SS/ AL Ø B FLANGE HOLES DIAMETER Ø A FLANGE O.D. DETAIL C SCALE 1:2 2

3 Specifications Pressure & Vacuum Dimensions and Weights, inches [mm] and lbs. (kg) Size Code A B Hole # 25 [635] 22 3 / 4 [578] / 2 [699] 25 [635] [813] 29 1 / 2 [750] / 4 [985] 36 [915] [1169] 42 3 / 4 [1086] C Hole Ø Shipping Weight (AL) Shipping Weight (CS/SS) 1 1 / 4 [32] 95 (43) 188 (85) 1 1 / 4 [32] 101 (46) 205 (93) 1 3 / 8 [35] 117 (53) 251 (114) 1 3 / 8 [35] 152 (69) 349 (158) 1 5 / 8 [41] 186 (84) 442 (200) Flanges supplied in accordance with ANSI / API 650. Other flange standards available on request. Flanges are drilled only. Ø B FLANGE HOLES DIAMETER Ø A FLANGE O.D. 7 D Materials of Construction Protection Mesh SS 2. Spring Holder SS 3. Spring SS 4. Weather Hood AL 5. Vacuum Body SS/ AL 6. Cover CS/ SS/ AL 7. Base CS/ SS/ AL 8. Pressure Diaphragm PTFE 9. Diaphragm Seat SS/ AL 10. Drip Ring SS/ AL 11. Vacuum Diaphragm PTFE 12. Hinged Arm SS 13. Gasket Neoprene DETAIL D SCALE 1:2 DETAIL C SCALE 1:2 3

4 Flow Capacity (Pressure) 10" "

5 Flow Capacity (Pressure) 16" "

6 Flow Capacity (Pressure) 20" "

7 Flow Capacity (Pressure) 30" "

8 Flow Capacity (Vacuum) Mbar 10% 20% 50% Note: Vacuum relief available from 18" size and larger and capacity shown is for all sizes. 8

9 Ordering Information Model 400W Description Emergency Relief Manhole Covers Code Size (250mm) (300mm) (400mm) (450mm) (500mm) (600mm) (750mm) (900mm) Code Material (Base / Cover) 11 Aluminum / Aluminum 12 Steel / Aluminum 22 Steel / Steel SS / 316 SS Code Settings 1, WC (AL, CS, SS) WC (AL, CS, SS) WC (AL, CS, SS) WC (CS, SS) WC (CS, SS) WC (CS, SS) Code Vacuum Requirements 2 0 No Vacuum Required 1 Vacuum Required (Range WC) Code Flange Options 0 API ANSI 150# 2 Special (Specify) Code F R Flange Facing Options Flat Faced Raised Face (Steel and SS Base Only) 400W F (Example) Example: 24 Emergency Relief Manhole Cover, Aluminum Construction, Set Range WC Pressure, Vacuum Required, ANSI 150 FF Flanged Connection. NOTE: *Carbon Steel Base for welded connection only - for Drilled Base Consult Factory. 1. Consult Factory if pressure settigns greater than 1 PSIG are required for Aluminum. 2. Specify Pressure and Vacuum (When Applicable) Setting. 9

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