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ASTM/Uni-Bell Deflection Test Specifications

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Important Definitions:

Nominal Pipe Size:  Refers to the general description of pipe sizes such as 8", 10", 12", etc.

Average Inside Diameter:  For solid wall pipe, the average inside diameter is calculated using the average wall thickness rather than the minimum wall thickness.  The average wall is 6% thicker than the minimum wall thickness.  For profile pipe, the average inside diameter is the intended inside diameter.

Base Inside Diameter:  Mandrel is sized from the base inside diameter so that a statistical average of the manufacturing tolerances are accounted for so that the deflections measured reflect the quality of the installation and are not influenced by the manufacturing tolerances recognized in the pipe standard.

ASTM:  Refers to the American Society for Testing and Materials.  (100 Barr Harbor Drive, West Conshohocken, PA  19428, 610-832-9500)

Uni-Bell:  Refers to the Uni-Bell PVC Pipe Association.  (2655 Villa Creek Drive, Suite 155, Dallas, TX  75234, 972-234-3902) 

ASTM D-3034 SDR35

Deflection test off of base inside diameter

(Ultra-Rib pipe - same dimensions)
PIPE SIZE BASE I.D. 5% TEST 7.5% TEST
4 3.874 3.68 3.58
6 5.742 5.54 5.31
8 7.665 7.28 7.09
10 9.563 9.08 8.84
12 11.361 10.79 10.51
15 13.898 13.20 12.86

ASTM F-679 (T1 WALL)

Deflection test off of base inside diameter
PIPE SIZE BASE I.D. 5% TEST 7.5% TEST
18 16.976 16.13 15.70
21 20.004 19.01 18.50
24 22.480 21.36 20.80
27 25.327 24.06 23.44
ASTM D-3034 SDR26

Deflection test off of base inside diameter
PIPE SIZE BASE I.D. 5% TEST 7.5% TEST
6 5.612 5.33 5.19
8 7.488 7.12 6.93
10 9.342 8.87 8.64
12 11.102 10.54 10.27
15 13.575 12.90 12.56
18 16.586 15.76 15.34
21 19.545 18.57 18.08
24 21.964 20.87 20.32

ASTM F-794 for Ribbed Pipe

Deflection test off of base inside diameter (taken from UNI-B-9)
PIPE SIZE BASE I.D. 5% TEST 7.5% TEST
4 3.869 3.68 3.58
6 5.720 5.43 5.29
8 7.637 7.26 7.07
10 9.529 9.08 8.82
12 11.322 10.75 10.47
15 13.849 13.16 12.81
18 17.003 16.15 15.72
21 19.985 18.99 18.49
24 22.613 21.48 20.91
27 25.490 24.22 23.58
30 28.367 26.95 26.24
33 31.249 29.69 28.91
36 34.126 32.42 31.57
39 37.003 35.15 34.22
42 39.880 37.89 36.89
45 42.762 40.62 39.55
48 45.639 43.36 42.22
ASTM F-789

(4" T1 Wall - 6"-15" T2 Wall)

Deflection test off of base inside diameter (taken from UNI-B-10)
PIPE SIZE BASE I.D. 5% TEST 7.5% TEST
4 3.91 3.71 3.62
6 5.80 5.51 5.36
8 7.73 7.34 7.15
10 9.64 9.15 8.92
12 11.46 10.88 10.60
15 14.01 13.30 12.96

ASTM F-894

Deflection test off of base inside diameter
PIPE SIZE BASE I.D. 5% TEST 7.5% TEST
18 17.42 16.55 16.11
21 20.34 19.32 18.81
24 23.25 22.09 21.51
27 26.15 24.84 24.19
30 29.07 27.62 26.89
33 31.98 30.38 29.58
36 34.89 33.15 32.27
42 40.72 38.68 37.67
48 46.54 44.21 43.05
54 52.35 49.73 48.42
60 58.18 55.27 53.82
66 63.99 60.79 59.19
72 69.81 66.32 64.57
84 81.46 77.38 75.34
96 93.08 88.43 86.10
120 116.05 110.25 107.35
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