Page 31 - Mechanical Products Installation Handbook IH-1000M

INSTALLATION INSTRUCTIONS 23 Couplings
Reducing Coupling
Step 5. Alternate when tightening nuts until properly tightened to bring housing in contact with the bolt pads.
Note: Always tighten the nut and bolt set evenly. Uneven tightening can cause the gasket to pinch or bind.
When setting the torque on power impact wrenches, always refer to the manufacturer's recommended bolt torque specifications. Failure to use the manufacturer's settings and abide by manufacturer instructions may result in loss of warranty protection, invalidate listing certifications and/or cause personal injury or property damage.
GRINNELL Reducing Couplings, when properly installed, will have pad to pad contact between the housings. Use an optional Type 304 metal insert to prevent pipe telescoping when installing the Figure 716 Coupling in the vertical position. Prior to Step 2, place the insert inside the gasket aligning the insert slots with the ribs on the gasket.
Step 5.