ALUMINUM SPECIFICATIONS
Tolerance, Inches | ||
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 |
Schedule 5 and 10 | Schedule 20 and greater | |
Under 2 | +.015 – .031 | +.015 – .031 |
2-4 | +.031 – .031 | +1% – 1% |
5-7 | +.062 – .031 | +1% – 1% |
8-12 | +.093 – .031 | +1% – 1% |
WALL THICKNESS — PIPE
Schedule Number | Tolerance |
Allowable deviation of wall thickness at any point from nominal wall thickness | |
5 and 10 | ±12-1/2%, ±0.12 in. min. |
20 and greater | -12-1/2%2 |
WEIGHT — PIPE
Schedule Number | Tolerance |
Allowable deviation from theoretical weight | |
5 and 10 | For schedule 5 and 10, only diameter, wall thickness, and length tolerances apply. |
20 and greater | +8% |
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
Specified length Ft | Tolerance, Inches plus |
Allowable deviation from theoretical length | |
Up thru 20 | 1/4 |
Over 20 thru 40 | 1/2 |
STRAIGHTNESS — PIPE
Pipe size Inches | Tolerance5, Inches |
Allowable deviation from straight  D (max) | |
In total length or in any measured segment of one ft. or more of total length | |
Under 6 | .010 x measured length, ft. |
6 thru 12 | .020 x measured length, ft. |
STANDARD WELDING BEVELS — PIPE
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.