TITLE 8: AGRICULTURE AND ANIMALS
CHAPTER I: DEPARTMENT OF AGRICULTURE
SUBCHAPTER e: FERTILIZERS
PART 215 ANHYDROUS AMMONIA, LOW PRESSURE NITROGEN SOLUTIONS, EQUIPMENT, CONTAINERS, AND STORAGE FACILITIES
SECTION 215.TABLE A RATE OF DISCHARGE

Section 215.TABLE A   Rate of Discharge

 

Minimum required rate of discharge in cubic feet per minute (CFM) of air for safety relief valves.  Discharge measured at 60 degrees F. and atmospheric pressure (14.7 pounds per square inch).

 

Surface Area Sq. Ft.

CFM

Surface Area Sq. Ft.

CFM

Surface Area Sq. Ft.

CFM

 

 

 

 

 

 

20

258

185

1,600

900

5,850

25

310

190

1,640

950

6,120

30

360

195

1,670

1,000

6,380

35

408

200

1,710

1,050

6,640

40

455

210

1,780

1,100

6,900

45

501

220

1,850

1,150

7,160

50

547

230

1,920

1,200

7,410

55

591

240

1,980

1,250

7,660

60

635

250

2,050

1,300

7,910

65

678

260

2,120

1,350

8,160

70

720

270

2,180

1,400

8,410

75

762

280

2,250

1,450

8,650

80

804

290

2,320

1,500

8,900

85

845

300

2,380

1,550

9,140

90

885

310

2,450

1,600

9,380

95

925

320

2,510

1,650

9,620

100

965

330

2,570

1,700

9,860

105

1,010

340

2,640

1,750

10,090

110

1,050

350

2,700

1,800

10,330

115

1,090

360

2,760

1,850

10,560

120

1,120

370

2,830

1,900

10,800

125

1,160

380

2,890

1,950

11,030

130

1,200

390

2,950

2,000

11,260

135

1,240

400

3,010

2,050

11,490

140

1,280

450

3,320

2,100

11,720

145

1,310

500

3,620

2,150

11,950

150

1,350

550

3,910

2,200

12,180

155

1,390

600

4,200

2,250

12,400

160

1,420

650

4,480

2,300

12,630

165

1,460

700

4,760

2,350

12,850

170

1,500

750

5,040

2,400

13,080

175

1,530

800

5,300

2,450

13,300

180

1,570

850

5,590

2,500

13,520

 

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:

 

a)         Cylindrical container with hemispherical heads area = (overall length in feet times outside diameter in feet times 3.1416)

b)         Cylindrical container with semi-ellipsoidal heads. Area = (overall length in feet plus 0.3 outside diameter in feet) times diameter in feet times 3.1416.

c)         Spherical Container. Area = Outside diameter in feet squared times 3.1416

 

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

 

The rate of discharge may be interpolated for intermediate values of surface area.  For container with total outside surface area greater than 2,000 sq. ft., the required flow rate can be calculated using the formula, Flow Rate SCFM Air = 22.11A degrees .82, where A= outside surface area of the container in square feet.