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Bolt torqueing of flange nuts and bolts

In a flanged connection, all components must be correct to achieve a seal. The most common cause of leaky casketed joints is improper installation procedures.

Before beginning a bolting process, the following preliminary steps will avoid future problems:

  • Clean the flange faces and check for scars; the faces must be clean and free of defects 9burrs, pits, dents etc)
  • Visually inspect all bolts and nuts for damaged or corroded threads. Replace or repair bolts or nuts as necessary
  • Remove burrs from all threads
  • Lubricate the threads of the bolt or stud and the surface of the nut face adjacent to the flange or washer. Hardened washers are recommended in most applications
  • Start the tightening procedure by lubricating the nuts and bolts. Then hand lighten till they are snug against the flanges. If an air wrench is used, make sure the pressure is set to the minimum. When lightening, always use the correct sequential bolt order for the flange

Seacad has the ability to tighten 4/8/12/16 or more bolt flanges according to ASME standards. The aim is to achieve a leak free fastener assembly prior to start-up. We have various sizes of bolts ranging from 1” to 3” to cater for the oil and gas and power industry. Our equipment are easy to use, robust and flexible in the field and our man power are well trained also able to install the bolted connections both on the ground and at elevated heights.

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