Figure 2. Replacing Gasket and Closing Manway
Ensure the tank is empty and at atmospheric pressure before performing the following procedures to
replace the manway:
When handling wastewater components, wear gloves to prevent serious
illness due to contamination. Minimize the effect of spills by draining any
remaining fluids and rinse water into a designated disposal point.
The 4-inch drain valve gaskets are mandatory replacement parts.
1. Remove the drain valve (figure 3, item 1) from the manway (figure 3, item 2) as described in WP
2. Using a 5/32-inch punch, remove and retain two lock pins (figure 3, item 3) from the manway hinge pin
(figure 3, item 4).
Figure 3. Replacing Gasket and Closing Hatch
3. Remove and retain the hinge pin (figure 4, item 1).
4. Loosen and remove the top two and bottom two swing bolt assemblies (figure 4, item 2) off cover.