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36.21.640    WELL CASING

(1) All casing installed, other than plastic casing set forth in ARM 36.21.641 and 36.21.645, shall be of steel, in new or like new condition, being free of pits, breaks, or contamination, and shall meet minimum American society of testing materials (ASTM A-120) specifications for line pipe, for the following sizes: Minimum specifications for steel well casing

 

Nominal Size 

(inches

Outside

Diameter

(inches)

Wall

Thickness (inches) 

Weight

Per Foot (pounds)

2

2.375

.154

3.56

2

2.875

.203

5.79

3

3.500

.216

7.58

3

4.000

.226

9.11

4

4.500

.237

10.79

5

5.563

.244

13.70

6

6.625

.250

17.02

8

8.625

.250

22.36

10

10.750

.250

28.04

12

12.750

.312

41.45

14

14.000

.312

45.68

16

16.000

.312

52.27

18

18.000

.375

70.59

20

20.000

.375

78.60

(2) All casing having a diameter larger than 20 inches shall have a wall thickness of at least .375 inch.

(3) Well casing installed in a well greater than a nominal diameter of 10 inches, may have a wall thickness of .250 inch as long as it otherwise meets ASTM A-120 specifications and does not exceed the following depth limitations:

 

Diameter 

Maximum Depth

12 inches

250 feet

14-16 inches

150 feet

18-20 inches 

100 feet

  

(4) Casings of other specifications may be considered under the provisions of variances ARM 36.21.680.

History: 37-43-202 (3), MCA; IMP, Sec. 37-43-202 (3), MCA; NEW, 1986 MAR p. 1699, Eff. 10/17/86.

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