The drill pipe is an industrial tubular used in ground drilling. Its most common use is in the oil and gas industry where lengths of drill pipe are screwed together and collectively referred to as the drill string. The drill bit at the bottom of the drill string is responsible for the actual underground boring. Drill pipe is often pushed to extreme depths and therefore endures the toughest subterranean conditions.
Drill pipe is compliant with the specifications developed by organizations such as the American Petroleum Industry (API). These specifications include the steel’s mechanical properties, the manufacturing details, and the new drill pipe dimensional data. Such dimensions are the external and internal diameters, the upset dimensions for the nominal size, the weight and grade, and the wall thickness.
New Drill Pipe Classifications
Because of the working conditions that drill pipe is subjected to, it has to be carefully and regularly monitored for wear and tear. An instrument used to assess the drill pipe, particularly the sphere’s radius, is a spherometer.
Under the Recommended Practice 7G guidelines established by API, new drill pipe classifications include the following:
New Pipe
This pipe has not been used and therefore is at its strongest grade.
Premium Pipe
The premium pipe is lower than the N-class pipe and endured some uniform wear but still functions favorably. It must have 80% minimum wall thickness.
Class 2 Pipe
All wear must be on one side of the pipe, with the cross-sectional area being the same as the premium pipe, which has no more than 20% reduction on the uniform wall. The minimum thickness on the new specified wall should not be less than 65%.
Class 3 pipe
The pipe must have a minimum wall thickness of 55% and the wear must all be on one side.
Under Class 2 Pipe and Class 3 Pipe, the drill pipe is approaching its well-worn stage. Once the pipe has reached the end of its serviceable life, it is graded as scrap. However, as pipes are very costly, they can be sold as used and can be reused based on the above categories.
New Drill Pipe Dimensional Data Chart
The New Drill Pipe Dimensional Data Chart below is based on API RP 7G and presents the following dimensions of new drill pipe under each column: the size of external diameter (D), wall thickness and internal diameter (ID) expressed in inches; the nominal weight with threads and couplings and the plain-end weight in pounds per foot, the section area of the pipe (A) in square inch, and the polar sectional modulus (Z) in cubic inches.
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New Drill Pipe Dimensional Data Chart
| OD (in) | Nom. Wt Threads & Couplings lb/ft | End Wgt | Wall Thkns (in) | ID (in) | Body of Pipe (sq/in) | Polar Sectional Modulus (cu/in) | |
|---|---|---|---|---|---|---|---|
| wdt_ID | OD (in) | Nom. Wt Threads & Couplings lb/ft | End Wgt | Wall Thkns (in) | ID (in) | Body of Pipe (sq/in) | Polar Sectional Modulus (cu/in) |
| 1 | 2 3/8 | 4.85 | 4.43 | 0.190 | 1.995 | 1.3042 | 1.321 |
| 2 | 6.65 | 6.26 | 0.280 | 1.815 | 1.8429 | 1.733 | |
| 3 | 27/8 | 6.85 | 6.16 | 0.217 | 2.441 | 1.812 | 2.241 |
| 4 | 10.40 | 9.72 | 0.362 | 2.151 | 2.8579 | 3.204 | |
| 5 | 4 | 11.85 | 10.46 | 0.262 | 3.476 | 3.0767 | 5.400 |
| 6 | 14.00 | 12.93 | 0.330 | 3.340 | 3.8048 | 6.458 | |
| 7 | 15.70 | 14.69 | 0.380 | 3.240 | 4.3216 | 7.157 | |
| 8 | 41/2 | 13.75 | 12.24 | 0.271 | 3.958 | 3.6004 | 7.184 |
| 9 | 16.60 | 14.98 | 0.337 | 3.826 | 4.4074 | 8.543 | |
| 10 | 20.00 | 18.69 | 0.430 | 3.640 | 5.4981 | 10.232 |
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New Drill Pipe Dimensional Data Chart
| OD (in) | Nom. Wt Threads & Couplings lb/ft | End Wgt | Wall Thkns (in) | ID (in) | Body of Pipe (sq/in) | Polar Sectional Modulus (cu/in) | |
|---|---|---|---|---|---|---|---|
| wdt_ID | OD (in) | Nom. Wt Threads & Couplings lb/ft | End Wgt | Wall Thkns (in) | ID (in) | Body of Pipe (sq/in) | Polar Sectional Modulus (cu/in) |
| 1 | 2 3/8 | 4.85 | 4.43 | 0.190 | 1.995 | 1.3042 | 1.321 |
| 2 | 6.65 | 6.26 | 0.280 | 1.815 | 1.8429 | 1.733 | |
| 3 | 27/8 | 6.85 | 6.16 | 0.217 | 2.441 | 1.812 | 2.241 |
| 4 | 10.40 | 9.72 | 0.362 | 2.151 | 2.8579 | 3.204 | |
| 5 | 4 | 11.85 | 10.46 | 0.262 | 3.476 | 3.0767 | 5.400 |
| 6 | 14.00 | 12.93 | 0.330 | 3.340 | 3.8048 | 6.458 | |
| 7 | 15.70 | 14.69 | 0.380 | 3.240 | 4.3216 | 7.157 | |
| 8 | 41/2 | 13.75 | 12.24 | 0.271 | 3.958 | 3.6004 | 7.184 |
| 9 | 16.60 | 14.98 | 0.337 | 3.826 | 4.4074 | 8.543 | |
| 10 | 20.00 | 18.69 | 0.430 | 3.640 | 5.4981 | 10.232 |
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New Drill Pipe Dimensional Data Chart Abbreviations:
- OD – Outer Diameter
- ID – Inner Diameter
- lb/ft – pounds per feet
- in – Inches
- sq. in. – square inch
- Cu. in. – cubic inch
- Nom. Wt – Nominal Weight
- End.Wgt – End Weight
- Wall Thkns – Wall Thickness
Go here if you are looking for the Used Premium Drill Pipe Torsion, Tensile and Pressure Data Chart.
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