EMERGENCY PRESSURE RELIEF VALVE

Model 2000A
■ Sizes 16,” 20” and 24”
■ Pressure settings 1.5 - 16 oz/in2
■ Vacuum settings 0.5 - 4 oz/in2
■ Available in carbon steel,
stainless steel, fiberglass and
other materials
■ Easy access manway combined
with emergency relief.

MODEL 2000A (PRESSURE)

EMERGENCY PRESSURE
RELIEF VALVE
Model 2000A is designed to provide emergency
relief capacity beyond that furnished by the nor-
mal operating pressure relief valve on the tank.
The valve protects the tank against rupture or
explosion that could result from excessive inter-
nal pressures caused by fire, etc. As excessive
pressure builds up, Model 2000A relieves, then
reseats when over pressure has been dissipated.
MODEL 2050A (PRESSURE & VACUUM)
Removable stops can be provided which restrict
the lift of the cover.

SPECIAL FEATURES
Model 2000A is built of corrosion resistant mate-
rials throughout. A restraining cable connects the
head and flange and also serves as a grounding
cable. Groth’s special Teflon ® 1 “cushioned air”
pallet and peripheral guiding insures proper
alignment and integrity of seating. Model 2050A
incorporates a vacuum breaker.

GROTH, THE CAPABILITY

COMPANY
As with all Groth products, every Model 2000A is MODEL 2050A
factory inspected and tested to meet your critical
requirements and special needs. Inventory is
maintained to insure rapid delivery.

1
Teflon is a registered trademark of DuPont Corporation.

MODEL 2000A
Section 4:400-423.qxd, June, 2002, 2.5m Groth Corporation, a Continental Disc company, Stafford, TX, USA 400
 SPECIFICATIONS

MODEL 2000A Specifications subject to change without notice. Certified dimensions available upon request.

Minimum Maximum A B Approx. Ship.

Pressure Pressure Width Height† Weight Lbs. (kg)
Size* Setting Setting (mm) (mm) (At min. setting)
Weight Loaded Weight Loaded
16” 1.80 oz/in2 23 1/2 ” 11” 62
(400mm) (7.8 mbar) (597) (279) (28)
20” 1.60 oz/in2 16 oz/in2 27 1/2 ” 11” 88
(500 mm) (6.9 mbar) (69 mbar) (699) (279) (40)

24” 1.50 oz/in2 32” 11” 114

(600 mm) (6.5 mbar) (813) (279) (52)

MODEL 2050A Specifications subject to change without notice. Certified dimensions available upon request.

Minimum Setting Max. Settings A BB Height Approx. Ship.

Pressure Vacuum Pressure▲ Width Closed Weight Lbs. (kg)
Size* Weight Loaded Spring Loaded Weight Loaded (mm) (mm) (At min. setting)
16” 2.6 oz/in2 23 1/2 ” 17 3/4 ” 69
(400 mm) (11.2 mbar) (597) (451) (31)
20” 2.1 oz/in2 0.5 oz/in2 8 oz/in2 27 1/2 ” 17 3/4 ” 95
(500 mm) (9.1 mbar) (2.2 mbar) (34.5 mbar) (699) (451) (43)

24” 1.9 oz/in2 32” 17 3/4 ” 120

(600 mm) (8.2 mbar) (813) (451) (55)

* 150# A.N.S.I. or API 650 drilling compatibility. “Caution” — See IOM when mounting to API 650 flange. ▲
Maximum pressure setting on 16” size = 4 oz/sq. in. Max. Vacuum Setting is 4 oz./sq. in.
Fiberglass dimensions on request.

HOW TO ORDER
For easy ordering, select proper model numbers

MODEL # SIZE MATERIAL OPTIONS

O = No Options
2000A Pressure only * Material Z = Special Options
2050A Pressure/vacuum 16" O = No Jacket
20" 3 = Carbon Steel J = Steam Jacket
24" 5 = 316 SS
6 = Vinyl Ester Resin 1 = A.N.S.I. 150# drilled
7 = Furan 2 = A.P.I. 650 drilled
NOTES

Include model number and setting when ordering. Z = Special Diaphragm material (seat)
For special options, consult factory.
When ordering steam jacket, include steam pressure/temperature. B = Buna-N T = Teflon® 1
* Seat material on Carbon Steel base is 316 S.S. weld overlay V = Viton® Z = Special

EXAMPLE 2 0 0 0 A 2 0 5 T 1 J 0

indicates a 20" Model 2000A with 316 SS Material, Teflon® 1 Seat Diaphragm, ANSI 150# Drilled, Steam Jacket and no other options.
1
Teflon is a registered trademark of DuPont Corporation.

401 Groth Corporation, a Continental Disc company, Stafford, TX, USA

 EMERGENCY PRESSURE RELIEF VALVE
Model 2000A
Emergency Pressure Relief Capacity

Set Pressure/Vacuum Air Flow Capacity at 100% Over-pressure (Double Set Pressure/Vacuum)
(Ps) 1000 Standard Cubic Feet per Hour at 60° F
2050
In WC Oz/Sq In 16” Pressure 20” Pressure 24” Pressure All Vacuum Only

0.87 0.50 * 65 Use

1.73 1.00 * 91 “C”
2.60 1.50 422 668 970 Factor
Chart
3.00 1.73 454 718 1043 on
3.46 2.00 * 487 771 1120 129 Page
4.00 2.31 524 829 1204 412
for
4.33 2.50 545 862 1252 Vacuum
5.00 2.89 585 926 1345 Flow
5.19 3.00 * 597 944 1371 157
6.93 4.00 * 689 1090 1583 180
10.4 6.00 843 1334 1937
13.9 8.00 973 1539 2236
17.3 10.0 1087 1720 2498
20.8 12.0 1190 1883 2735
24.2 14.0 1284 2033 2952
27.7 16.0 1372 2172 3154
* Standard vacuum settings, consult factory for other settings.
Flow capacity is certified by Groth Corporation, based on actual tests conducted in compliance with API Std. 2000.
Flow measurement accuracy has been verified by an independent testing laboratory.

Flow capacity values listed above are based on full open valves at 100% over-pressure. Example—To find “C” factor from table:
Read “C” factor for 75% Over-pressure at intersection of row 70 and column 5
Vacuum flow rating applies only to Model 2050A. “C” factor at 75% OP = 0.95

Read the flow capacity at 100% over-pressure directly from the table above. Use linear “C” Factor Table - Pressure Only
interpolation if the set pressure is not listed. (Ref: Page TPD1) %OP 0 1 2 3 4 5 6 7 8 9
If the allowable over-pressure is less than 100%, modify the flow capacity using the 10 0.70 0.71 0.71 0.72 0.72 0.73 0.73 0.74 0.74 0.75
appropriate “C” factor from the table. If allowable over-pressure is more than 100%, consult 20 0.75 0.76 0.76 0.77 0.77 0.78 0.78 0.79 0.79 0.80
page TPD1 or your Groth Representative. Note: Vacuum capacity is modified using the “C”
factor on page 412. 30 0.80 0.81 0.81 0.82 0.82 0.83 0.83 0.84 0.84 0.85
40 0.85 0.86 0.86 0.87 0.87 0.88 0.88 0.89 0.89 0.90
Calculate the percentage over-pressure by the following formula. Note that all pressures are
gage pressure expressed in the same units of measure. 50 0.90 0.90 0.90 0.91 0.91 0.91 0.91 0.91 0.92 0.92
60 0.92 0.92 0.92 0.93 0.93 0.93 0.93 0.93 0.94 0.94
Pf = Flowing pressure
Ps = Set pressure 70 0.94 0.94 0.94 0.95 0.95 0.95 0.95 0.95 0.96 0.96
% OP = [(Pf - Ps)/Ps] x 100 80 0.96 0.96 0.96 0.97 0.97 0.97 0.97 0.97 0.98 0.98
Calculate flow capacity at less than 100% over-pressure according to the following example. 90 0.98 0.98 0.98 0.99 0.99 0.99 0.99 0.99 1.00 1.00

Example—Flow Capacity Calculation 1. Read flow capacity at Type 2000A 2050A

set pressure from table Flow = 829,000 SCFH
20” Model 2000A 2. Calculate over-pressure % OP = [(7 - 4)/4] x 100 = 75% Pressure ✔ ✔
4 In WC set pressure [Ps] 3. Read “C” factor from table “C” = 0.95
7 In WC flowing pressure [Pf] 4. Calculate flow capacity Flow = 0.95 x 829,000 = 787,550 SCFH Vacuum ✔

Groth Corporation, a Continental Disc company, Stafford, TX, USA 402

 EMERGENCY PRESSURE RELIEF VALVE
Model 2000A
Emergency Pressure Relief Capacity

Set Pressure/Vacuum Air Flow Capacity at 100% Over-pressure (Double Set Pressure/Vacuum)
(Ps) 1000 Standard Cubic Meters per Hour at 0° C
2050
mm WC mb 16” Pressure 20” Pressure 24” Pressure All Vacuum Only

22 2.16 * 1.83 Use

44 4.31 * 2.58 “C”
88 8.63 * 13.8 21.9 31.7 3.63 Factor
Chart
100 9.80 14.7 23.3 33.8 on
132 12.9 * 16.9 26.8 38.9 4.42 Page
176 17.3 * 19.5 30.9 44.9 5.08 413
for
200 19.6 20.8 32.9 47.8 Vacuum
250 24.5 23.2 36.8 53.4 Flow
300 29.4 25.5 40.3 58.5
350 34.3 27.5 43.5 63.2
400 39.2 29.4 46.5 67.5
500 49.0 32.8 51.9 75.4
600 58.8 35.9 56.9 82.6
700 68.6 38.8 61.4 89.1
* Standard vacuum settings, consult factory for other settings.

Flow capacity is certified by Groth Corporation, based on actual tests conducted in compliance with API Std. 2000.
Flow measurement accuracy has been verified by an independent testing laboratory.

Flow capacity values listed above are based on full open valves at 100% over-pressure. Example—To find “C” factor from table:
Read “C” factor for 75% Over-pressure at intersection of row 70 and column 5
Vacuum flow rating applies only to Model 2050A. “C” factor at 75% OP = 0.95

Read the flow capacity at 100% over-pressure directly from the table above. Use linear “C” Factor Table - Pressure Only
interpolation if the set pressure is not listed. (Ref: Page TPD1) %OP 0 1 2 3 4 5 6 7 8 9
If the allowable over-pressure is less than 100%, modify the flow capacity using the 10 0.70 0.71 0.71 0.72 0.72 0.73 0.73 0.74 0.74 0.75
appropriate “C” factor from the table. If allowable over-pressure is more than 100%, consult 20 0.75 0.76 0.76 0.77 0.77 0.78 0.78 0.79 0.79 0.80
page TPD1 or your Groth Representative. Note: Vacuum capacity is modified using the “C”
factor on page 413. 30 0.80 0.81 0.81 0.82 0.82 0.83 0.83 0.84 0.84 0.85
40 0.85 0.86 0.86 0.87 0.87 0.88 0.88 0.89 0.89 0.90
Calculate the percentage over-pressure by the following formula. Note that all pressures are
gage pressure expressed in the same units of measure. 50 0.90 0.90 0.90 0.91 0.91 0.91 0.91 0.91 0.92 0.92
60 0.92 0.92 0.92 0.93 0.93 0.93 0.93 0.93 0.94 0.94
Pf = Flowing pressure
Ps = Set pressure 70 0.94 0.94 0.94 0.95 0.95 0.95 0.95 0.95 0.96 0.96
% OP = [(Pf - Ps)/Ps] x 100 80 0.96 0.96 0.96 0.97 0.97 0.97 0.97 0.97 0.98 0.98
Calculate flow capacity at less than 100% over-pressure according to the following example. 90 0.98 0.98 0.98 0.99 0.99 0.99 0.99 0.99 1.00 1.00

Example—Flow Capacity Calculation 1. Read flow capacity at Type 2000A 2050A

set pressure from table Flow = 23,300 NCMH
20” Model 2000A 2. Calculate over-pressure % OP = [(175 - 100)/100] x 100 = 75% Pressure ✔ ✔
100 mm WC Set Pressure [Ps] 3. Read “C” factor from table “C” = 0.95
175 mm WC Flowing Pressure [Pf] 4. Calculate flow capacity Flow = 0.95 x 23,300 = 22,135 NCMH Vacuum ✔

403 Groth Corporation, a Continental Disc company, Stafford, TX, USA