Remove the O-ring (9) from the groove in the flange mount unisex coupling (8) flange face and dispose of in
accordance with local SOP.
Figure 4-8. Flange Mount Three-Inch Unisex Coupling
b. Installation. (Figure 4-8.)
Wipe clean the flange mount unisex coupling (8) O-ring groove.
Handle and install the O-rings carefully. O-rings can be damaged easily during
installation. Do not "roll" the O-rings or install it in such a way that the flange
mount unisex coupling (8) can pinch or cut the O-rings when installed.
Lightly lubricate with petrolatum and install O-ring (9) in groove on flange mount unisex coupling (8).
Position flange mount unisex coupling (8) on inlet/outlet port (10) so that valve handle is up and install the six
bolts (5), flat washers (6) and self-locking nuts (7). Tighten bolts evenly and securely in a crossing pattern.
Close manual vent valve (2).
Install filtration vessel gravity drain plug (4).
Place grounding cable (1) in storage location.