Drill Pipes with Welded Tool Joints

The drill pipes with welded tool joints are installed in the drilling string and are connected with the kelly bar in the top and with the drill collar and drill bit or tool in the bottom.

Drill Pipes with Welded Tool Joints
The pipes are manufactured at four length groups:
Pipe length, L, m:
Group 1 Group 2 Group 3 Group 4
5,9…6,3 8,0…8,4 9,0…9,4 11,9…12,5
Standard pipe size Strength group Tool joint Thread
BN-60х7,11 D, E, L, M ZP-86-45 Z-73
BK-73х7 D ZP-86-45-1 Z-73
BK-73х9 D, E ZP-92-34 Z-73
BK-73х9 D, E, L, M ZP-105-45 Z-86
BN-73х9 D, E ZP-105-54 Z-86
BN-73х9,19 D, E, L, M ZP-105-51 Z-86
BV-89х8 D, E ZP-108-45 Z-86
BN-89х6,5 D, E ZP-121-76 Z-102
BN-89х8 D, E, L ZP-121-68 Z-102
BN-89х9,35 D, E ZP-121-68 Z-102
BN-89х9,35 L ZP-127-65 Z-102
BN-89х9,35 M ZP-127-62 Z-102
BN-114х8,56 D, E, L, M ZP-159-93 Z-133
BK-127х9,19 D, E ZP-162-95 Z-133
BK-127х9,19 D, E, L ZP-162-89 Z-133
Standard pipe size Reduced mass of pipe (L=9.3 m)
kg/1 rm)
Mtors. t.joint/
Mtors. pipe
Screw torsional moment of tool joint thread,
BN-60х7,11 10,4 0,9 3000
BK-73х7 12,8 1 3000
BK-73х9 15,8 0,9 4500
BK-73х9 16,5 1 6700
BN-73х9 16,2 1,1 5600
BN-73х9,19 16,7 0,9 5890
BV-89х8 18,9 0,9 6770
BN-89х6,5 15,7 1 6000
BN-89х8 18,9 0,9 8000
BN-89х9,35 20,9 1 8000
BN-89х9,35 21,7 0,9 9000
BN-89х9,35 21,9 0,9 10000
BN-114х8,56 26,9 1 19000
BK-127х9,19 31,1 1 27100
BK-127х9,19 32,1 0,9 22700
TU 1324-137-0147016-01
  • This specification cover seamless steel pipes with upset ends and welded tool joints.
  • The drill pipes with welded tool joints are installed in the drilling string and are connected with the kelly bar in the top and with the drill collar and drill bit or tool in the bottom.
  • The pipes are to be used for drilling oil, gas and test wells, workover, and emergency service in relevant casing strings.
  • The climatic zone of use is from I1 up to II12 as per GOST 16350.
  • The tool joints to be welded to pipes are supplied in accordance with TU 3663-128-01470016-00.
  • The pipe integrated tool joints are considered to be repairable items.
  • The specified repair life (original life) of tool joints is not less than 1200 screw-unscrew cycles.
  • The sizes of drill pipes with welded tool joints and of tool-joint thread are in accordance with API standard, Spec. 7, and extend the range of drill pipes not covered by GOST R 50278-92.
  • The pipes have optimal values of ratio of torsional moments of tool joint and of pipe, also they have optimal moments of resistance box and pin, and of tensile strains of tool joint and pipe.
  • In pipe design, the optimal values of pipe end upset coefficients were selected; it results in good pipe characteristics in respect to reduced mass of pipe.
  • The pipe end upset can be external (EUE), internal (IUE) or combined.

Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


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