Table T4. CORK stinger tubular strength comparison, Expedition 336.
| Nominal pipe size (inches) |
Weight (lb/ft) |
OD (inches) |
ID (inches) |
Area (inch2) |
Area of moment of inertia (inch4) |
Critical column load (lb) |
Critical column length (m) |
Joint strength (lb) |
Modulus of elasticity (lb/inch2) |
Yield or tensile strength (lb/inch2) |
|---|---|---|---|---|---|---|---|---|---|---|
| 4-1/2 csg | 10.5 | 4.500 | 4.052 | 3.009 | 6.884 | 1,152 | 33.4 | 132,000 | 30,000,000 | 55,000 |
| 5-1/2 csg | 17.0 | 5.500 | 4.892 | 4.962 | 16.775 | 2,136 | 38.3 | 229,000 | 30,000,000 | 55,000 |
| 5 DP | 22.1 | 5.000 | 4.250 | 5.449 | 14.639 | 2,432 | 33.5 | 735,576 | 30,000,000 | 135,000 |
| 5-1/2 DP | 31.9 | 5.500 | 4.500 | 7.854 | 24.745 | 3,700 | 35.4 | 1,060,290 | 30,000,000 | 135,000 |
| 4-1/2 FG | 3.5 | 4.570 | 3.980 | 3.962 | 9.078 | 421 | 36.7 | 118,859 | 10,000,000 | 30,000 |
OD = outside diameter, ID = inside diameter. csg = casing, DP = drill pipe, FG = fiberglass. Area = (OD2 – ID2) × (π/4). Area of moment of inertia = (π/64) × (OD4 – ID4). Critical column load = critical column length × weight per foot. Critical column length = [(π2 × modulus of elasticity × area of moment of inertia)/(weight per foot/12 inches/ft)]0.3. Joint strength = published data or calculated – area × yield or tensile strength.
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