Coupling Shop

Couplings are threaded female connectors used to assemble Oil Country Tubular Goods. voestalpine Tubulars has the largest automated coupling manufacturing facility in Western Europe. The coupling manufacturing process involves the following steps: Tubes referred to as coupling stock are cut into blanks by automated saws. The blanks are transported to the CNC threading machines, where threads are cut to stringent tolerances. Subsequently, the couplings are inspected, nondestructively tested, phosphatized and, color-coded according to applicable specifications. Finally, they are torqued onto the tubes during the tube threading operations.

The coupling stock is cut into coupling blanks using four CNC cut-off machines.

Technical data

manufacturer LINSINGER
length of coupling stock 7.000 - 13.000 mm (23-42.6 ft)
outside diameter range 48-220 mm (1.890 - 8.661 in)
outside diameter range 4-21 mm (0.156 - 0.827 in)
length of coupling blanks 40-350 mm (1.575 - 13.708 in)

 

Couplings are produced for API and premium threads on a total of 9 threaders.

Technical data

manufacturer HEID
type eight- double spindle machine
control Siemens 3T
main drive direct current motor 60 kW
speed range max. 1500 rpm
chuck hydraulic swiveling chuck with centrifugal force compensation

Technical data

manufacturer COLINET
type one center drive machine
control Fanuc 15 TTB
main drive direct current motor 106 kW
speed range max. 1000 rpm
chuck hydraulic chuck

The couplings are subjected to visual inspections under UV light for longitudinal and transverse flaws.

Two - Units installed in parallel

Technical data

manufacturer CGM
type The couplings are inspected using a yoke; alternating-current magnetic flux, and wet fluorescence magnetic powder
detection capabillities Flaws in any direction on the outside and inside diamet
outside diameter range 50 – 200 mm (1.969 - 7.874 in)
inside diameter range > 40 mm (>1.575 in)

Technical data

manufacturer TIEDE
type The couplings are inspected using a yoke; alternating-current magnetic flux, and wet fluorescence magnetic powder
detection capabillities Flaws in any direction on the outside and inside diameter
outside diameter range 50 – 200 mm (1.969 - 7.874 in)
inside diameter range > 40 mm (>1.575 in)

Phosphating involves applying an 8 – 10 µm (0.315 – 0.394 mils) zinc phosphate layer to the coupling threads. This provides temporary protection against corrosion and improves galling resistance.

Technical data

manufacturer SCHLOETTER
phosphating medium zinc phosphate
process sequence Hot degreasing
Flow rinsing
Hot rinsing
Phosphating
Flow rinsing
Neutralizing
Oiling
Drying