ALUMINUM SPECIFICATIONS
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Tolerance, Inches
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Pipe
Size Inches |
Allowable deviation
of mean1 diameter from nomial diameter.  Difference between
1/2 (AA + BB) and nominal diameter |
Allowable deviation
of diameter at any point from nominal diameter.  Difference between
AA and nominal diameter |
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Schedule 5 and 10
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Schedule 20
and greater |
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Under 2
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+.015 – .031
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+.015 – .031
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2-4
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+.031 – .031
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+1% – 1%
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5-7
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+.062 – .031
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+1% – 1%
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8-12
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+.093 – .031
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+1% – 1%
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WALL THICKNESS — PIPE
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Schedule
Number |
Tolerance
|
|
Allowable deviation of wall thickness
at any point from nominal wall thickness |
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5 and 10
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±12-1/2%, ±0.12 in. min.
|
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20 and greater
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-12-1/2%2
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WEIGHT — PIPE
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Schedule
Number |
Tolerance
|
|
Allowable deviation
from theoretical weight |
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5 and 10
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For schedule 5 and 10, only diameter, wall thickness, and length tolerances apply.
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20 and greater
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+8%
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1 Mean diameter is the average of any two diameter measurements taken at right angles to each other at any point along the length.
2 Maximum wall thickness is controlled by weight tolerance
3 For schedule 5 and 10, only diameter, wall thickness, and length tolerances apply.
4 Minimum weight is controlled by tolerances for outside diameter and wall thickness.
LENGTH — PIPE
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Specified
length Ft |
Tolerance, Inches plus
|
|
Allowable deviation
from theoretical length |
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Up thru 20
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1/4
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Over 20 thru 40
|
1/2
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STRAIGHTNESS — PIPE
|
Pipe
size Inches |
Tolerance5, Inches
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|
Allowable deviation from straight
 D (max) |
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In total length or in any
measured segment of one ft. or more of total length |
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Under 6
|
.010 x measured length, ft.
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6 thru 12
|
.020 x measured length, ft.
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STANDARD WELDING BEVELS — PIPE
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DOUBLE BEVEL
For wall thickness over 0.750 in. |
STRAIGHT BEVEL
For wall thickness 0.750 in. and less |
 |
 |
When weight of pipe on flat surface minimizes deviation.