Threaded coupling connection for non-upset tubing pipes, NU API Spec 5CT

 

Application

Intended for use in oil and gas wells.

 

Design description

The peculiar design feature of connections with the thread of round (triangular) profile is that the thread fits along the lateral sides of the triangular profile. The required tightness of the connection is ensured by thread-lubricant sealing of clearances during the mechanical make-up. The thread profile has the angle of 60°, taper of 1:16.

Make-up control

  • In case of correct mechanical make-up, the coupling face moves up to the surface of pipe thread run-out end.

Main features of non-upset tubing pipe connections as per API Spec 5 CT

Pipe Coupling
Outer diameter D, mm Wall thickness S, mm Inner diameter d, mm Weight* of 1 m pipe, kg Outer diameter Dc, mm Coupling length Lc, mm Weight*, kg
1 2 3 4 5 6 7
26,67 2,87 20,93 1,70 33,35 80,96 0,23
3,91 18,85 2,20
33,40 3,38 26,64 2,53 42,16 82,55 0,38
4,55 24,30 3,26
42,16 3,56 35,04 3,42 52,17 88,90 0,59
4,85 32,46 4,51
48,26 3,68 40,90 4,09 55,88 95,25 0,56
5,08 38,10 5,43
6,35 35,56 6,58
7,62 33,02 7,66
60,32 4,24 51,84 5,95 73,02 107,95 1,28
4,83 50,66 6,85
6,45 47,42 8,63
7,49 45,34 9,82
8,53 43,26 10,94
73,02 5,51 62,00 9,52 88,90 130,18 2,34
7,01 59,00 11,61
7,82 57,38 12,80
8,64 55,75 13,91
9,96 53,10 15,63
11,18 50,66 17,11
88,90 5,49 77,92 11,46 107,95 142,88 3,71
6,45 76,00 13,69
7,34 74,22 15,18
9,52 69,86 18,90
10,92 67,06 21,28
12,09 64,72 23,07
13,46 61,98 25,30
101,60 5,74 90,12 14,14 120,65 146,05 4,35
8,38 84,84 19,64
10,54 80,52 23,96
12,70 76,20 28,13
15,49 70,62 33,04
114,30 6,88 100,54 18,75 132,08 155,58 4,89
8,56 97,18 22,62
9,65 95,00 25,30
10,92 92,46 28,13
12,70 88,90 32,00
14,22 85,86 35,27
16,00 82,30 38,84
* — estimated value