Making sure that
seals stay in sockets, place nine outer filter elements in outer sockets on upper spider.
Make sure upper and lower seals are properly seated for each filter element.
Slowly press lower spider down while aligning outer filter elements with guide pins.
Install six washers, three springs, and three hex nuts on spider tie rod ends, item 14. Hand tighten until nuts
contact top washers. Tighten hex nuts evenly another seven turns each to compress but not completely
Record completion of this maintenance action in maintenance logbook.
Coagulant or inhibitor drum replacement
Avoid exposure to coagulant (Hydrapol-50) and inhibitor (Hydrapol-100). Wear
safety goggles or faceshield and rubber gloves when working around chemicals.
If chemical is swallowed, do not induce vomiting. Drink water and seek medical
attention. If chemical gets in eyes, flush with water and seek medical attention. If
chemical contacts skin, wash with soap and water.
Disconnect suction hose from chemical metering pump on top of pretreatment skid.
Pump suction hose enters drum through the larger of two plastic bungs that are
screwed into the drum.
Remove suction hose, with suction foot valve and weight attached, from empty drum.
Drum breather (vent) hose enters drum through smaller plastic bung and hangs
over the side.
Remove breather hose.
Remove empty drum.
Ensure that correct drum is removed and replaced.
Coagulant drum is normally painted black. Inhibitor drum is normally painted
Obtain new drum using drum lifter and bridge crane with 2-ton hoist. Position and secure drum in rack.
Install suction hose in drum through hole in large bung. Make sure foot valve is just above the drum bottom.
Connect other end of suction hose to chemical metering pump.
Insert breather hose into smaller bung in the drum. Make sure hose does not siphon chemical onto the deck.
Prime chemical metering pump according to paragraph 4-7.1.5.