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 Indiana Administrative Code (Last Updated: December 20, 2016)
 Title 355. STATE CHEMIST OF THE STATE OF INDIANA
 Article 355IAC3. AGRICULTURAL AMMONIA
 Rule 355IAC3-9. Minimum Rate of Discharge Permitted for Pressure Relief Valves Used on Containers Not in Accordance with DOT Specifications

Section 355IAC3-9-1. Minimum rate of discharge for pressure relief valves

Latest version.

  •    The minimum required rate of discharge in cubic feet per minute of air at one hundred twenty percent (120%) of the maximum permitted start-to-discharge pressure for pressure relief valves to be used on containers other than those constructed in accordance with DOT specifications shall be as follows:

    Surface Area

    Flow Rate

    Square Feet

    CFM Air

    20

    258

    25

    310

    30

    360

    35

    408

    40

    455

    45

    501

    50

    547

    55

    591

    60

    635

    65

    678

    70

    720

    75

    762

    80

    804

    85

    845

    90

    885

    95

    925

    100

    965

    105

    1,010

    110

    1,050

    115

    1,090

    120

    1,120

    125

    1,160

    130

    1,200

    135

    1,240

    140

    1,280

    145

    1,310

    150

    1,350

    155

    1,390

    160

    1,420

    165

    1,460

    170

    1,500

    175

    1,530

    180

    1,570

    185

    1,600

    190

    1,640

    195

    1,670

    200

    1,710

    210

    1,780

    220

    1,850

    230

    1,920

    240

    1,980

    250

    2,050

    260

    2,120

    270

    2,180

    280

    2,250

    290

    2,320

    300

    2,380

    310

    2,450

    320

    2,510

    330

    2,570

    340

    2,640

    350

    2,700

    360

    2,760

    370

    2,830

    380

    2,890

    390

    2,950

    400

    3,010

    450

    3,320

    500

    3,620

    550

    3,910

    600

    4,200

    650

    4,480

    700

    4,760

    750

    5,040

    800

    5,300

    850

    5,590

    900

    5,850

    950

    6,120

    1,000

    6,380

    1,050

    6,640

    1,100

    6,900

    1,150

    7,160

    1,200

    7,400

    1,250

    7,660

    1,300

    7,910

    1,350

    8,160

    1,400

    8,410

    1,450

    8,650

    1,500

    8,900

    1,550

    9,140

    1,600

    9,380

    1,650

    9,620

    1,700

    9,860

    1,750

    10,090

    1,800

    10,330

    1,850

    10,560

    1,900

    10,800

    1,950

    11,030

    2,000

    11,260

    2,050

    11,490

    2,100

    11,720

    2,150

    11,950

    2,200

    12,180

    2,250

    12,400

    2,300

    12,630

    2,350

    12,850

    2,400

    13,080

    2,450

    13,300

    2,500

    13,520

    (1) Surface Area = Total outside surface area of a 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 (1) 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 other than hemispherical heads:

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

    (C) Spherical container:

    Area = outside diameter in feet squared times 3.1416

    (2) Flow Rate CFM Air = Cubic feet per minute of air required at standard conditions, sixty (60) degrees Fahrenheit and atmospheric pressure (14.7 psia).

    The rate of discharge may be interpolated for intermediate values of surface area. For containers with a total outside surface area greater than two thousand five hundred (2,500) square feet, 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. (State Chemist of the State of Indiana; Agricultural Ammonia App A; filed Dec 30, 1965, 2:15 p.m.: Rules and Regs. 1966, p. 26; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1648; errata filed Apr 24, 2001, 9:06 a.m.: 24 IR 2709; readopted filed Jun 20, 2001, 3:22 p.m.: 24 IR 3822; readopted filed Apr 27, 2007, 2:03 p.m.: 20070509-IR-355070039RFA; readopted filed Nov 25, 2013, 3:27 p.m.: 20131225-IR-355130482RFA)