Ensure the sealing surfaces are clean, dry, and free of grease.
Position the gasket so that it is centered on the flange (use the bolts as a guide).
Lubricate the fasteners well. Be sure to lubricate all load bearing surfaces on the bolts, nuts, and washers.
Assemble bolts, washers and nuts on the flange.
Finger-tighten the bolts, moving in a circular direction.
Utilize a calibrated torque device to torque each bolt in a star pattern sequence. Apply the torque in three passes:
Apply the torque at 100% of Target Torque in a circular pass. Then wait 4 hours.
Complete the installation by performing circular passes until all bolts have acheived the target torque.