By: Vam Services  09-12-2011
Keywords: Thread Design, Coupling Design,

VAM® TOP is globally recognised as setting the standard in reliability and performance, for threaded and coupled premium connections. The connection represents the output of 30 years of V&M TUBES’ Research & Development activities and has a track record that stretches back over more than a decade. The connection minimises the risks that result from combined loads induced by:

- Excellent resistance to bending, compression and torque
- Reliable gas-tight sealing under any kind of combined loads
- Easy to use and repair
- Successful field running experience for more than 10 years

Energized metal-to-metal seal

  • A patented metal-to-metal seal system offers excellent gas-tight sealing, under even the most severe combined loads, as encountered in deviated or long horizontal wells.
  • The seal integrity remains constant after repeated make-ups and break-outs.
  • The seal geometry protects against galling.

Reverse Angle Torque Shoulder

  • A reverse angle torque shoulder provides a positive torque stop which allows for accurate power-tight make-up and minimizes hoop stresses in the connection.
  • The "wedge" effect caused by the reverse angle gives the connection superior structural strength.
  • The shoulder design is optimized in order to resist adverse conditions such as combined compression and external pressure or combined bending, compression, and torque (see the corresponding gas-tight VME performance envelopes for tubing and casing sizes).

Improved hook thread design

  • A modified hook thread profile with 3° reverse angle on the load flank, not only provides the connection with superior tension strength but also increases its resistance to compression.
  • The excellent structural strength including increased bending and compression resistance, makes this connection especially suited for highly deviated and long horizontal wells.
  • Optimized thread geometry minimizes the risk of galling, even when thread lubricants are poorly applied.

Coupling design

  • The 100% efficient connection performance has been engineered through factors such as: the coverage of the vanishing threads, long internal shoulder, and coupling critical cross sections greater than those of the pipe body

Streamlined internal profile

  • A pin ID chamfer, tight tolerances on the coupling center and a long shoulder combine to minimize turbulence and energy loss inside the connection for high-velocity gas flows.

Extensive testing to the limits

  • The connection has been extensively tested through the whole range of diameters in accordance with the most stringent qualification procedures, including the latest ISO13679 standards.


  • Enhanced HP-HT qualified designs are available upon request, for the most extreme applications.
  • VAM® TOP SC90 / VAM® TOP SC80 (special clearance): these extraclearance couplings offer 90% and 80% tensile efficiency respectively.
  • GRE liner: the combination of a GRE liner with a standard VAM® TOP connection has been tested and fully validated.
  • CLEANWELL®: this option gives access to all the benefits coming from a dope-free solution: no storage dope, no running dope.
  • VAM® TOP HT / VAM® TOP HC / VAM® TOP FE: Specific VAM® TOP designs are available for higher torque applications / higher compression applications / enhanced fatigue resistance. Please refer to the dedicated leaflets for details.

Keywords: Coupling Design, Thread Design,

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The torque shoulder dimension on VAM® TOP HT is significantly larger than VAM TOP which enables the connection to withstand combined load for various applications using high torque (See the corresponding gas tight VME Performance Envelope). Excellent torque capability - Excellent gas-tight sealing under combined loads - Excellent resistance to bending - Excellent resistance to external pressure and compression - Easy to use and repair.