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Sanitary Tube
Specifications, Grit & Finish Guide
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Tube vs. Pipe?
Manufactured to a set outside diameter, tube is expressed as 1.5" OD,
.065" wall. Pipe is specified by a
nominal, not actual, inside diameter. The wall thickness of pipe is
described by the "schedule" such as schedule 40.
|
Tube OD |
Tube ID |
Wall Thickness |
Weight Dry |
Volume |
Weight with Water |
Flow at a Mean Velocity GPM |
||
| Inches | Inches | Inches | lbs/100 ft | gal/100 ft | lbs/100 ft | 5 fps | 7 fps | 10 fps |
| 1/4 | 0.180 | 0.035 | 8.1 | .013 | 9.2 | 0.40 | 0.56 | 0.79 |
| 3/8 | 0.305 | 0.035 | 12.9 | .038 | 16.0 | 1.14 | 1.59 | 2.28 |
| 1/2 | 0.370 | 0.065 | 30.6 | 0.56 | 35.3 | 1.7 | 2.3 | 3.4 |
| 3/4 | 0.620 | 0.065 | 48.2 | 1.57 | 61.3 | 4.7 | 6.6 | 9.4 |
| 1 | 0.870 | 0.065 | 65.8 | 3.09 | 91.5 | 9.3 | 13 | 19 |
| 1 1/2 | 1.370 | 0.065 | 100.9 | 7.66 | 164.8 | 23 | 32 | 46 |
| 2 | 1.870 | 0.065 | 136.1 | 14.27 | 255.1 | 43 | 60 | 86 |
| 2 1/2 | 2.370 | 0.065 | 171.2 | 22.92 | 362.4 | 69 | 96 | 138 |
| 3 | 2.870 | 0.065 | 206.4 | 33.60 | 486.7 | 101 | 141 | 202 |
| 4 | 3.834 | 0.083 | 351.8 | 59.97 | 851.9 | 180 | 252 | 360 |
| 6 | 5.782 | 0.109 | 694.7 | 136.39 | 1832.2 | 409 | 573 | 818 |
| 8 | 7.782 | 0.109 | 930.6 | 247.07 | 2991.1 | 741 | 1038 | 1482 |
Grit & Finish
| Grit | Ra (Range, micro-inch) |
| 150 | 30-35 |
| 180 | 20-25 |
| 240 | 15-20 |
| 320 | 9-11 |
Sanitary Tubing: Brief Description by Finish Number
| No. | Description |
| 1 | Industrial
or mill finish. Bright annealed, pickled, sand blast or tumbled. |
| 3 | Sanitary.
ID polished to #150 grit or 32 Ra, OD mill finish. |
| 3A | Polished 150 grit OD, 180 grit ID |
| 5 | Industrial. ID mill finish, OD polish to#150 grit or 32 Ra. |
| 7 | Sanitary. ID and OD polished to #150 grit or 32 Ra. |
Finish Specifications
| Process | RA Micro Inch | RA Micron | ISO designation |
| 150 grit 150 grit + Electropolish |
30 - 35 12 - 20 |
0.75 - 0.875 0.3 - .05 |
N6 |
| 180 grit 180 grit + Electropolish |
20 - 25 10 - 16 |
0.5 - .0625 0.25 - 0.4 |
|
| 240 grit 240 grit + Electropolish |
15 - 20 8 - 12 |
0.375 - 0.5 0.2 - 0.3 |
N5 |
| 320 grit 320 grit + Electropolish |
8 - 12 6 - 12 |
0.2 - 0.3 0.15 - 0.3 |
N4 |
Metal Chemistry of Stainless Steel
Related: Fitting Guide, Gasket Guide, Stainless Steel Grades