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Specific tools are required for cleaning and tensioning the fasteners. Additionally, always use standard safety equipment and follow good safety practices. Acquire the following equipment prior to installation:
  • Calibrated torque wrench, hydraulic or other tensioner
  • Wire brush (brass if possible)
  • Helmet
  • Safety goggles
  • Lubricant
  • Other plants – specified equipment
  • Remove all foreign material and debris from the seating surfaces, fasteners (bolts or studs), 
    nuts, and washers. Use plant-specified dust control procedures.
  • Examine fasteners (bolts or studs), nuts, and washers for defects such as burrs or cracks.
  • Examine flange sur faces for warping, radial scores, heav y tool marks, or any thing prohibi t ing 
    proper gasket seating.
  • Replace components if found to be defective. If in doubt, seek advice.
  • Align flange faces and bolt holes without using excessive force.
  • Report any misalignment.
  • Assure gasket is the specified size and material. 
  • Examine the gasket to ensure it is free of defects.
  • Carefully insert gasket between flanges.
  • Make sure the gasket is centered between the flanges.
  • Do not use jointing compounds or release agents on the gasket or seating surfaces unless 
    specified by the gasket manufacturer.
  • Bring flanges together, ensuring the gasket isn’t pinched or damaged.
  • Use only specifi ed or approved lubricants.
  • Liberally apply lubricant uniformly to all thread, nut, and washer load-bearing surfaces.
  • Ensure lubricant doesn’t contaminate either fl ange or gasket face.
  • Always use proper tools: calibrated torque wrench or other controlled tensioning device.
  • Consult your gasket manufacturer and/or engineering department for guidance on torque 
    specifi cations.
  • Always torque nuts in a cross bolt tightening pattern.
  • Tighten the nuts in multiple steps:
    1. Step - Tighten all nuts initially by hand. (Larger bolts may require a small hand wrench.)
    2. Step - Torque each nut to approximately 30% of full torque.
    3. Step – Torque the nuts to approximately 60% of full torque.
    4. Step – Torque each nut to full torque, again using the cross bolt tightening pattern. (Large-diameter fl anges may require additional tightening passes.)
    5. Step – Apply at least one fi nal full torque to all nuts in a clockwise direct ion unt i l all torque is uniform. (Large-diameter fl anges may require additional tightening passes.)
Caution: Consult your gasket manufacturer and/or engineering department for guidance and recommendations on retightening. 
Do not retorque elastomer-based, asbestos-free gaskets after they have been exposed to 
elevated temperatures unless otherwise specifi ed.
Retorque fasteners exposed to aggressive thermal cycling.
All retorquing should be performed at ambient temperature and atmospheric pressure.