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Vertical Shaft Pipe Coupling - Hydrocore Thercom

Supplier: Dual Valves Australasia

The N.G.D vertical shaft coupling is used to connect high pressure pipes in a vertical shaft column.


The 'best' couplings is a tailor-made coupling, to enable the joining of pipes in a vertical shaft, which offers many advantages of which few are listed below.

  • occupies small shaft space.
  • individual support of each pipe in the shaft.
  • the coupling is a natural expansion joint.
  • low cost compare with flanges.
  • integrates the pipe support into the coupling structure.
  • no bolting or welding is required for the pipe joining.
  • quick and easy handling of pipes in the shaft.
  • seals are not affected by water hammer occurrence.


  • N.G.D valves is the designer and the manufacturer of the 'BEST' pipe  couplings.
  • the mechanical design was verified by A.T.D, utilising final element analysis method.
  • the testing procedure complies with: -
  • ASTM, BPV section VIII and ASME/ASTM B31.3
  • Anglo-American Technical Department (ATD)

Pipe Manufacturing

  • pipe ends are machined for thick wall pipes.
  • pipe ends are pre-machined and welded to the pipes for thin wall pipes.
  • pipes are coated after machining of the pipe ends.
  • the pipe's wall thickness complies with manufacturing tolerances for pipes.
  • the pipes lifting lugs are welded to the pipes and the mechanical strength is sufficient to lift the pipes.

Pipes Handling

  • plastic covers protect the pipe ends during transport and installation.
  • the location of the pipe lifting lugs, are designed to enable easy installation or removal of pipes in the shaft.
  • pipe ends will be checked by N.G.D supervisor, prior to the installation.

Installation Tolerances

  • vertical misalignment     : ±20mm
  • horizontal misalignment (9.0m pipes)     : ±50mm
  • angular misalignment     : 0.5

Material of Construction

  • Coupling          : EN-8 or BS3100 grade ‘A2’
  • Bolts                 : Stainless Steel
  • Coating            : 50μ epoxy on 30μ base zinc
  • Seals               : Polyurethane/Rubber
  • Eye-bolts         : Grade 8.8 galvanised

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