8 CCR 1202-5-A

Minimum required rate of discharge in cubic feet per minute of air at 120 per cent of the maximum permitted start to discharge pressure for safety relief valves to be used on containers other than those constructed in accordance with United States Department of Transportation cylinder specifications.

Surface

Area

Sq. Ft.

Flow

Rate

CFM Air

Surface

Area

Sq. Ft.

Flow

Rate

CFM Air

Surface

Area

Sq. Ft.

Flow

Rate

CFM Air

Surface

Area

Sq. Ft.

Flow

Rate

CFM Air

20

258

145

1,310

340

2,640

1,350

8,160

25

310

150

1,350

350

2,700

1.400

8,410

30

360

155

1,390

360

2,760

1,450

8,650

35

408

160

1,420

370

2,830

1,500

8,900

40

455

165

1,460

380

2,890

1,550

9,140

45

501

170

1,500

390

2,960

1,600

9,380

50

547

175

1,530

400

3,010

1,650

9,620

55

591

180

1,570

450

3,320

1,700

9,860

60

638

185

1,600

500

3,620

1,750

10,090

65

678

190

1,640

550

3,910

1,800

10,330

70

720

195

1,670

600

4,200

1,850

10,560

75

762

200

1,710

650

4,480

1,900

10,800

80

804

210

1,780

700

4,760

1,950

11,030

85

845

220

1,850

750

5,040

2,000

11,260

90

885

230

1,920

800

5,300

2,050

11,490

95

925

240

1,980

850

5,590

2,100

11,720

100

965

250

2,050

900

5,850

2,150

11,950

105

1,010

260

2,120

950

6,120

2,200

12,180

110

1,050

270

2,180

1,000

6,380

2,250

12,400

115

1,090

280

2,250

1,050

6,640

2,300

12,630

120

1,120

290

2,320

1,100

6,900

2,350

12,850

125

1,160

300

2.380

1,150

7,160

2,400

13,080

130

1,200

310

2,450

1,200

7,410

2,450

13,300

135

1,240

320

2,510

1,250

7,660

2,500

13,520

140

1,280

330

2,570

1,300

7,910

Surface Area = Total Outside Surface Area of Container in Square Feet. When the Surface Area is not stamped on the name plate or when the marking is not legible, the area can be calculated by using one of the following formulas:

(1) Cylindrical container with hemispherical heads

Area = overall length in feet times outside diameter in feet times 3.1416.

(2) Cylindrical container with other than hemispherical heads

Area = (overall length in feet plus 0.3 outside diameter in feet) times outside diameter in feet times 3.1416.

(3) Spherical container

Area = outside diameter in feet squared times 3.1416.

Flow Rate- CFM Air = cubic feet per minute of air required at standard conditions, 60°F and atmospheric pressure (14.7 psia).

The rate of discharge may be interpolated for intermediate values of surface area. For containers with total outside surface area greater than 2.500 sq. ft., the required flow rate can be calculated using the formula, Flow Rate CFM Air = 22.11 A0.82 where A = outside surface area of the container in square feet.

Notes

8 CCR 1202-5-A
38 CR 23, December 10, 2015, effective 12/30/2015 43 CR 22, November 25, 2020, effective 12/15/2020

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