The Drillpipe: Tubulars
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TUBULARS The Drillpipe Connections
Below shows the different thread styles and forms used in the oil industry. API Regular (REG) Internal Flush (IF) Full Hole (FH) Extra Hole (XH) Number Connx (NC)
Tooljoint Markings
Size
Type
OD
ID
TPI
Thread Form
Make Up Torque
4 1/2"
API Reg
5 1/2"
2 1/4"
5
V.040
15,500
4 1/2"
Full Hole
5 3/4"
3"
5
V.040
17,700
4 1/2"
NC 46 (4" IF)
6"
3 1/4"
4
V.038R
16,900
4 1/2"
NC 50 (4 1/2" IF)
6 1/8"
3 3/4"
4
V.038R
18900
4 1/2"
H90
6"
3 1/4"
3 1/2"
90 deg V.050
22,600
Thread Form Comparison
Below shows the different thread styles and forms used in the oil industry. API Regular (REG) Internal Flush (IF) Full Hole (FH) Extra Hole (XH) Number Connx (NC)
Tooljoint Markings
Size
Type
OD
ID
TPI
Thread Form
Make Up Torque
4 1/2"
API Reg
5 1/2"
2 1/4"
5
V.040
15,500
4 1/2"
Full Hole
5 3/4"
3"
5
V.040
17,700
4 1/2"
NC 46 (4" IF)
6"
3 1/4"
4
V.038R
16,900
4 1/2"
NC 50 (4 1/2" IF)
6 1/8"
3 3/4"
4
V.038R
18900
4 1/2"
H90
6"
3 1/4"
3 1/2"
90 deg V.050
22,600
Thread Form Comparison
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