Convert Technical Atmospheres to Feet of Water
Convert Technical Atmospheres (at) to Feet of Water (ftH₂O) instantly and accurately.
Conversion Formula
ftH₂O = at × 32.80839895
About Technical Atmospheres
One technical atmosphere (at) = exactly 1 kgf/cm² = 98,066.5 Pa ≈ 0.968 standard atmospheres. The metric technical pressure unit used in pre-SI European and Japanese engineering for boilers, hydraulic cylinders, and compressed gas systems. A steam boiler at 10 at operates at 0.981 MPa; hydraulic presses are rated at 200-600 at. Still used parenthetically in old German and Japanese machinery manuals and standards (DIN 1301-3 legacy). Converts simply from kgf/cm²: 1 at ≡ 1 kgf/cm². 1 at = 98,066.5 Pa.
About Feet of Water
One foot of water column (ftH₂O) ≈ 2,989 Pa - the US customary equivalent of cmH₂O used in civil and hydraulic engineering. Municipal water supply systems are designed for 40-80 psi head ≈ 92-184 ft; fire suppression sprinkler systems require minimum 7 psi ≈ 16 ft. Well pump specifications, sump pump head ratings, irrigation mainline pressure, and drainage calculations all use feet of head. 1 ft of water = 12 in WC = 0.4335 psi ≈ 2,989 Pa.
Quick Reference Table
| Technical Atmospheres (at) | Feet of Water (ftH₂O) |
|---|---|
| 1 at | 32.8084 ftH₂O |
| 2 at | 65.6168 ftH₂O |
| 5 at | 164.042 ftH₂O |
| 10 at | 328.084 ftH₂O |
| 25 at | 820.21 ftH₂O |
| 50 at | 1640.42 ftH₂O |
| 100 at | 3280.84 ftH₂O |