Convert Kilopounds per Square Inch to Feet of Water
Convert Kilopounds per Square Inch (ksi) to Feet of Water (ftH₂O) instantly and accurately.
Conversion Formula
ftH₂O = ksi × 2306.658726
About Kilopounds per Square Inch
One ksi (kilopound per square inch) = 1,000 psi ≈ 6.895 MPa - the standard engineering stress unit in the US. ASTM A36 structural steel: 36 ksi yield, 58-80 ksi tensile. ASTM A325 high-strength bolts: 92 ksi proof load. AISC steel construction tables, FAA/MIL-SPEC aerospace allowables, and ASME Section VIII pressure vessel design all use ksi. Fracture toughness (K_IC) for steels: 50-200 ksi·√in. Convenient because it keeps large structural stresses as manageable 3-digit numbers. 1 ksi = 6.895 MPa.
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
| Kilopounds per Square Inch (ksi) | Feet of Water (ftH₂O) |
|---|---|
| 1 ksi | 2306.66 ftH₂O |
| 2 ksi | 4613.32 ftH₂O |
| 5 ksi | 11533.3 ftH₂O |
| 10 ksi | 23066.6 ftH₂O |
| 25 ksi | 57666.5 ftH₂O |
| 50 ksi | 115333 ftH₂O |
| 100 ksi | 230666 ftH₂O |