PRESSURE/VACUUM VALVE & FLAME ARRESTER
MODEL 8820A
MODEL 8820A
The Groth Model 8820A Pressure/Vacuum Relief Valve & Flame Arrester are designed to protect your tank from damage created by overpressure or excessive vacuum, at the same time they provide protection from flame propagation. The result is reduced emission level and increased fire protection and safety.
Technical Details
• Sizes: 2” (DN 50) through 12” (DN 300)
• Pressure Settings 0.5oz/in2 to 15 psig
• Vacuum Settings: 0.5 oz/in2 to 12 psig
• Materials: Aluminum, Carbon Steel, Stainless Steel and other materials
Features
• Cushioned Air Seating
• Fluoropolymer seating diaphragms are standard to minimize sticking caused by resinous vapors and atmospheric moisture
• Self draining housing and drip rings
• Spiral-wound, crimped ribbon flame element
• Modular Construction
Options
• Buna-N, Fluoropolymer, FKM
PAGE 2
SPECIFICATIONS
† W.P. = Working Pressure. ‡On spring loaded valves, change model number. ◊150# R.F. drilling compatibility F.F. on aluminum and R.F. on carbon steel and stainless steel alloys. 16 oz/in2 set with spacer. SS set weights-consult factory. *Some sizes require non-ferrous components to achieve 0.5 oz/in2 setting
PAGE 3 A E Inlet Flg◊ In (mm) Outlet Flg◊ In (mm) Max. Set Pressure Weight Loaded oz/in2 (gm/cm2) Max. Set Vacuum Weight Loaded oz/in2 (gm/cm2) Max. Setting Spring Loaded Min. Setting Weight Loaded Max. W.P.† for Min. Vacuum Setting Min. Vac. Setting for Max. W.P.† A Length In (mm) B Height In (mm) C Width In (mm) D In (mm) E In (mm) Approx. Ship Al Wt. Lbs (kg) 2 (50) 3 (76) 11 (48.2) 12 (52.7) See TPD2 for Vacuum Settings and MAWP 14.25 (361) 26.62 (676) 8.75 (221) 20.25 (514) 5.50 (140) 45 (20) 3 (80) 4 (102) 13 (57.0) 11 (48.3) 18 (457) 31.12 (790) 9.50 (241) 23.12 (588) 6 (152) 60 (27) 4 (100) 6 (152) 16 (70.3) 11 (48.3) 19.25 (489) 37 (940) 11.50 (292) 26.75 (679) 6.50 (165) 90 (41) 6 (150) 8 (203) 16 (70.3) 16 (70.3) 26.50 (673) 44.75 (1136) 16.50 (419) 31.50 (800) 8.50 (216) 160 (73) 8 (200) 10 (254) 16 (70.3) 16 (70.3) 32.50 (826) 53.50 (1358) 21 (533) 37.37 (949) 10.75 (273) 270 (123) 10 (250) 12 (305) 16 (70.3) 16 (70.3) 37.25 (959) 64.50 (1638) 24.75 (629) 45.25 (1149) 12.50 (318) 420 (190) 12 (300) 14 (356) 16 (70.3) 16 (70.3) 42.75 (1086) 71.62 (1819) 28.62 (727) 50.12 (1273) 15 (381) 600 (273) 15 psig SPRING LOADED PRESSURE (1.05 kg/cm2) 12 psig SPRING LOADED VACUUM (0.84 kg/cm2) *0.5 oz/in2 WEIGHT LOADED (2.20 gm/cm2)
B D C
PRESSURE RELIEF CAPACITY
Flow Capacity Calculation
Flow capacity values listed above are based on full open valves at 100% overpressure. Read the flow capacity at 100% overpressure directly from the table above. Use linear sted. If the allowable overpressure is less than 100%, modify the flow capacity using the appropriate “C” factor from the table. If allowable overpressure is more than 100%, consult your Groth Representative.
Calculate the percentage overpressure by the following formula. Note that all pressures are gauge pressure expressed in the same units of measure.
Pf = Flowing pressure
Ps = Set pressure
% OP = [(Pf - Ps)/Ps] x 100
Calculate flow capacity at less than 100% overpressure according to the following example.
Example Flow Capacity Calculation
6” Model
4 InWC
pressure
7 InWC flowing pressure [Pf]3.Read “C” factor from table
Example to find “C” factor from table: Read “C” factor for 75% overpressure at intersection of row 70 and column 5
“C” factor at 75% OP = 0.87
PAGE 4
table
8820A 1.Read flow capacity at set pressure from
Flow = 58,000 SCFH
set
[Ps]2.Calculate overpressure % OP = [(7 - 4)/4] x 100 = 75%
= 0.87 4.Calculate flow capacity Flow = 0.87 x 58,000 = 50,460 SCFH Air
1000
Set
Size
InWCoz/in2 2 (50)3 (80)4 (100)6 (150)8 (200)10 (250)12 (300) 0.870.502.925.6810.320.732.351.559.1 1.000.583.196.3411.523.336.257.667.8 1.731.004.459.2316.834.453.084.4105 2.001.164.8410.118.537.858.292.6116 2.601.505.6411.921.744.668.5109138 3.001.736.1213.023.748.874.8119151 3.462.006.6514.125.953.281.6130165 4.002.317.2115.428.258.088.9141180 6.003.479.0719.535.773.6113179230 8.004.6210.723.042.186.8133211272 10.05.7812.126.147.798.6151240309 12.06.9313.328.952.9109167266343 15.08.6615.132.760.0124189301389 20.011.617.738.470.4146222354457 25.014.420.043.579.7165252400518 30.017.322.248.188.2182278443574 “C” Factor Table %OP0123456789 10 ••• Consult Factory••• 20 30 40 500.720.730.730.740.750.750.760.770.770.78 600.780.790.800.800.810.810.820.820.830.84 700.840.850.850.860.860.870.880.880.890.89 800.900.900.910.910.920.920.930.930.940.94 900.950.950.960.960.970.970.980.990.991.00
“C”
Flow Capacity at 100% Overpressure (Double Set Pressure)
Standard Cubic Feet per Hour at 60° F
Pressure (Ps)
In (mm)
PRESSURE RELIEF CAPACITY
Flow Capacity Calculation
Flow capacity values listed above are based on full open valves at 100% overpressure. Read the flow capacity at 100% overpressure directly from the table above. Use linear interpolation if the set pressure is not listed. If the allowable overpressure is less than 100%, modify the flow capacity using the appropriate “C” factor from the table. If allowable overpressure is more than 100%, consult your Groth Representative.
Calculate the percentage overpressure by the following formula. Note that all pressures are gauge pressure expressed in the same units of measure.
Pf = Flowing pressure
Ps = Set pressure
% OP = [(Pf - Ps)/Ps] x 100
Calculate flow capacity at less than 100% overpressure according to the following example.
Example Flow Capacity Calculation
Example to find “C” factor from table: Read “C” factor for 67% overpressure at intersection of row 60 and column 7
“C” factor at 75% OP = 0.82
6” Model 8820A 1.Read flow capacity at set pressure from table Flow = 2,080 NCMH
150 mmWC Set Pressure [Ps]2.Calculate overpressure % OP = [(250 - 150)/150] x 100 = 67%
250 mmWC Flowing Pressure [Pf] 3.Read “C” factor from table “C” = 0.82
4.Calculate flow capacity Flow = 0.82 x 2,080 = 1,706 NCMH
PAGE 5 “C” Factor Table %OP0123456789 10 ••• Consult Factory••• 20 30 40 500.720.730.730.740.750.750.760.770.770.78 600.780.790.800.800.810.810.820.820.830.84 700.840.850.850.860.860.870.880.880.890.89 800.900.900.910.910.920.920.930.930.940.94 900.950.950.960.960.970.970.980.990.991.00 Air Flow Capacity at 100% Overpressure (Double Set Pressure) 1000 Normal Cubic Meters per Hour at 0° C Set Pressure (Ps) Size In (mm) mmWC2 (50)3 (80)4 (100)6 (150)8 (200)10 (250)12 (300) 22.00.080.170.310.620.961.531.80 50.00.140.290.521.071.652.623.28 75.00.170.370.671.382.123.374.27 1000.200.440.801.642.524.015.11 1500.260.551.012.083.195.076.51 2000.300.651.192.463.765.987.70 2500.340.741.352.794.276.798.75 3000.380.821.503.104.737.529.70 3750.430.931.703.515.368.5311.0 5000.501.092.004.126.2910.013.0 6250.571.232.264.677.1311.314.7 7500.631.362.505.177.8912.516.3
VACUUM RELIEF CAPACITY
Flow Capacity Calculation
Flow capacity values listed above are based on full open valves at 100% over-vacuum. Read the flow capacity at 100% over-vacuum directly from the table above. Use linear interpolation if the set vacuum is not listed. If the allowable over-vacuum is less than 100%, modify the flow capacity using the appropriate “C” factor from the table. If allowable over-vacuum is more than 100%, consult your Groth Representative.
Calculate the percentage over-vacuum by the following formula. Note that all pressures are gauge pressure expressed in the same units of measure.
Pf = Flowing pressure
P s = Set pressure
% OV = [(Pf - Ps)/Ps] x 100
Calculate flow capacity at less than 100% over-vacuum according to the following example.
Example Flow Capacity Calculation
Example to find “C” factor from table: Read “C” factor for 75% Over-vacuum at intersection of row 70 and column 5
“C” factor at 75% OV = 0.87
6” Model 8820A 1.Read flow capacity at set vacuum from table Flow = 46,700 SCFH
4 InWC Set Vacuum [Ps]2.Calculate over-vacuum %
PAGE 6
OV = [(7 - 4)/4] x 100 = 75% 7 InWC Flowing Vacuum [Pf]3.Read “C” factor from table “C” = 0.87 4.Calculate flow capacity Flow = 0.87 x 46,700 = 40,629 SCFH Air
100% Over-vacuum
Vacuum) 1000 Standard Cubic Feet per Hour at 60° F Set Vacuum (Ps) Size In (mm) InWCoz/in2
(150)8 (200)10 (250)12 (300) 0.870.502.555.198.8017.928.644.353.9 1.000.582.775.739.7019.831.648.960.4 1.731.003.788.1513.628.345.169.490.7 2.001.164.108.9014.931.049.375.899.0 2.601.504.7410.417.436.257.788.6117 3.001.735.1411.318.939.562.996.0128 3.462.005.5612.320.542.968.4105139 4.002.316.0313.422.346.774.4114152 6.003.477.5416.928.158.993.8144193 8.004.628.8419.933.069.4110169227 10.05.7810.022.537.478.6125192258 12.06.9311.124.941.587.1139212286 15.08.6612.528.246.998.6157240324 20.011.614.733.155.1116184282381 25.014.416.637.562.3131209319432 30.017.318.341.568.9145231353478 “C” Factor Table %OV0123456789 10 ••• Consult Factory••• 20 30 40 500.720.730.730.740.750.750.760.770.770.78 600.780.790.800.800.810.810.820.820.830.84 700.840.850.850.860.860.870.880.880.890.89 800.900.900.910.910.920.920.930.930.940.94 900.950.950.960.960.970.970.980.990.991.00
Flow Capacity at
(Double Set
2 (50)3 (80)4 (100)6
VACUUM RELIEF CAPACITY
Flow Capacity Calculation
Flow capacity values listed above are based on full open valves at 100% over-vacuum. Read the flow capacity at 100% over-vacuum directly from the table above. Use linear interpolation if the set vacuum is not listed. If the allowable over-vacuum is less than 100%, modify the flow capacity using the appropriate “C” factor from the table. If allowable over-vacuum is more than 100%, consult your Groth Representative.
Calculate the percentage over-vacuum by the following formula. Note that all pressures are gauge pressure expressed in the same units of measure.
Pf = Flowing pressure
P s = Set pressure
% OV = [(Pf - Ps)/Ps] x 100
Calculate flow capacity at less than 100% over-vacuum according to the following example.
Example Flow Capacity Calculation
Example to find “C” factor from table: Read “C” factor for 67% over-vacuum at intersection of row 60 and column 7
“C” factor at 67% OV = 0.82
6” Model 8820A 1.Read flow capacity at set vacuum from table Flow = 1,660 NCMH
150 mmWC Set Vacuum [Ps]2.Calculate over-vacuum %
PAGE 7
OV = [(250 - 150)/150] x 100 = 67% 250 mmWC Flowing Vacuum [Pf]3.Read “C” factor from table “C” = 0.82 4.Calculate flow capacity Flow = 0.82 x 1,660 = 1,361 NCMH Air Flow Capacity at 100% Over-vacuum (Double Set Vacuum) 1000 Normal Cubic Meters per Hour at 0° C Set Vacuum (Ps) Size In (mm) mmWC2 (50)3 (80)4 (100)6 (150)8 (200)10 (250)12 (300) 22.00.070.150.260.520.841.291.60 28.00.080.170.280.580.921.432.00 50.00.120.250.420.871.392.132.78 75.00.140.320.531.111.772.723.59 1000.170.380.631.322.093.214.27 1500.210.480.791.662.644.055.42 2000.250.560.931.953.114.766.40 2500.280.631.052.213.535.407.27 3000.310.701.172.453.905.978.06 3750.350.801.322.784.426.779.10 5000.410.931.553.265.197.9410.7 6250.471.061.763.695.878.9812.2 7500.521.171.944.086.509.9013.5 “C” Factor Table %OV0123456789 10 ••• Consult Factory••• 20 30 40 500.720.730.730.740.750.750.760.770.770.78 600.780.790.800.800.810.810.820.820.830.84 700.840.850.850.860.860.870.880.880.890.89 800.900.900.910.910.920.920.930.930.940.94 900.950.950.960.960.970.970.980.990.991.00
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Groth Corporation, LLC reserves the right to alter the information in this publication without notice. // © 2021 Groth Corporation, LLC Reproduction without written permission is prohibited. LIT1307 // 0321 GROTHCORP.COM
HOW TO ORDER
For easy ordering, select proper model numbers
MODEL #
Flame Element Pallet Seat Body*
1 = Aluminum
3 = Carbon Steel
5 = 316 SS
Z = Special
Notes
• Include model number and setting when ordering.
• For special options, consult factory.
• When ordering steam jacket, include steam pressure/temperature.
O = No Options
Z = Special Options
Diaphragm Material (Seat):
B = Buna-N
T = Fluoropolymer
V = FKM
Z = Special
* Stainless steel guides, stems are standard with aluminum and carbon steel bodies. Stainless steel seats standard with carbon steel bodies.
Example
8820A 8 8 2 0 0 2 1 1 A 02 = 2” thru 12 = 12" T O 5 1
Indicates a 2” Model 8820A with Aluminum Body and Seat, 316 SS Pallet, Fluoropolymer Seat Diaphragm, and no other options.
GROTHCORP.COM
SIZEMATERIAL
OPTIONS
Groth Corporation, LLC reserves the right to alter the information in this publication without notice. // © 2021 Groth Corporation, LLC Reproduction without written permission is prohibited. LIT19159 // 0321