APPENDIX |
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| DIMENSIONAL TOLERANCES |
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| of Steel Butt Welding Fitting Listed in This Catalogue |
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| Listed below are the Dimensional Tolerances which our fittings are manufactured. These tolerance are in accordance with the American Standards Association's Specifications A. S. A. B16.9 for all dimensions that have been established by that standard. The limits givem are the maximum permitted and our products will normally run much closer to nominal dimensions than to permitted extremes. |
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| WALL THICKNESS |
| The wall thickness shall not at any point be less tahn 87.1/2% of nominal thickness |
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| OUTSIDE DIAMETER |
| The outside diameter to beginning of chamfer shall not vary from nominal more than : |
| For Sizes up to and incl. 22" ..................... + 1.16:-1/32" |
| For Sizes 3" thru 4" ..................................... + 1/16"-1/16" |
| For Sizes 5" thru 8" ..................................... + 3/32" - 1/16" |
| For Sizes 10" thru ...................................... + 5/32 - 1/8" |
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| INSIDE DIAMETER |
| The inside dimeter at welding ends shall not vary from nominal more than : |
| For sizes up to and including 22" ............................. ± 1/32" |
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| WELDING BEVEL |
| The welding bevel dimensuons shall not vary from nominal more than : |
| Bevel angles, 3720 and 200.......................... ± 22% |
| 100.......................................................... ± 10 |
| 1/16" land on end ...................... ± 1/32" |
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| CENTER - TO - END OF 900 ELBOWS, 450 ELBOWS, TEES. |
| The center to - end dimension shall not vary from nominal more than : |
| For sizes up to and including 8" ........................... ± 1/16" |
| For sizes 10" thru 24" ................................... ± 3/32" |
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| CENTER - TO - CENTER OF 1800 RETURNS |
| The center - to- center dimension shall not vary from nominal more than : |
| Sizes up to and including 8" .................................. ± 1/4" |
| Sizes 10" and large* ................................................. ± 3/8" |
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| BACK - TO - FACE OF 180 RETURNS |
| The back -to - face dimension shall not vary from nominal more than : |
| All sizes* ................................ ± 1.4" |
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| BEVEL DETAILS |
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