Varco HT-Tong HT100, Руководство пользователя

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5
Operations
HT-Tong
5-21
Applying make up torque
Torque is the measurement of the amount of twist applied to two pipes as they are
screwed together. The product of the tong arm length L and the line pull F is the
measurement of torque, when the tong-arm and the pulling line are at a (90°) angle.
Example:
7
3
/
4
” DC with 6
5
/
8
” reg. connection has a recommended make-up torque of 58,500 Ft Lbs
(79,315 Nm). The HT tong capable of supplying this torque is the HT 65 tong. The length
of the tong arm is appr. 4.25 Ft (1.29 m). The force to be applied on the pull line will be:
F = make-up torque / arm lenght = 58,500 / 4.25 = appr. 13,765 Lbs. (79,315 / 1.29 =
61,485 N = appr. 6,000 kg)
Appr. Dimensions L max Appr. Dimensions L min
Ft m Ft m
HT14 2.25 0.69 2.05 0.63
HT35 short lever 3 0.92 2.8 0.85
HT35 long lever 3.95 1.2 3.72 1.13
HT50 Depending on casing head assembly
HT55 short lever 4.6 1.4 4.25 1.29
HT55 long lever 4.1 1.25 3.85 1.17
HT65 4.95 1.45 4.25 1.29
HT100 5 1.53 4.5 1.37
HT200 5.2 1.59 6.5 2
i
NOTE: A line-pull measuring device should be used in
making-up connections. It is important that the line-pull is
measured when the line is at the right 90° angle relative to
the tong handle. When applying line-pull to the tong, apply
a long steady pull rather than jerking the line.
Force
L