See Oil Removal Options in this catalog (Section 4) for additional information.

Read and comply with WARNINGS at the end of these instructions

(Paragraph G).

A. General

Periodic preventative maintenance should be scheduled based on actual usage, but should not exceed six month intervals.

B. Oil-Water Separator

1. Inspect separator for general appearance and operation.

2. Inspect for coating durability and possible corrosion. Maintain operating water level at full in the oil-water separator. Level is established by the invert of the outlet pipe under static conditions. Be sure separator is always plumb and properly vented.

3. Maintain individual components as indicated elsewhere in these instructions.

4. Remove sludge from separator by pump out or other method every six months or as is dictated by site conditions. See sludge removal paragraph E.

5. Oil removal is in accordance with type of oil removal system chosen. See oil removal Paragraph F.

C. Corrugated Plate and Parallel Plate Separator

1. Once every year, plates and other separator internals should be visually inspected for a hard film or sludge build-up using proper safety gear for internal access to separator. See WARNINGS under Paragraph G.

2. Typically, the McTighe corrugated plates require little maintenance. If necessary, the plates may be removed and cleaned with pressure washer or a steam wand.

D. Petro Pak* Equipped Separators

1. Follow a regular maintenance schedule for Petro Pak* coalescer. We recommend inspecting the Pak during routine separator maintenance. Experience will increase or decrease the frequency of Petro Pak* cleaning requirements.

2. In addition, McTighe recommends the cleaning of the Pak after heavy rainfalls (storm events that cause flooding conditions and/or wash-out of drainage piping), oil spills, or high loading of the separator with sludge or foreign debris.

3. Refer to Petro Pak* Description Sheet for maintenance information.

E. Sludge Removal

1. The McTighe cylindrical oil-water separator has the primary sludge collection area within the main separator with a sludge baffle just down stream of the access manway. The location of this baffle allows direct pump access to the sludge collection area through the manway. This feature enables sludge removal from grade without entering the separator.

2. The sludge accumulation can be checked by lowering a gauge stick down the access manway. Move the stick around to determine if solids are present and to estimate the thickness of the sludge layer.

3. Every six months or periodically as experience dictates, remove sludge from the separator using a diaphragm lift pump, vac truck or other means. Sludge removal may be aided by pressure water agitation. Refill separator with clean water after sludge removal.

F. Oil Removal

1. Our standard separator is equipped with a 4" NPT gauge port in the access manway cover. The oil layer thickness can be checked using a gauge stick with water detection paste. The paste changes color when in contact with water which enables the determination of the oil layer thickness. McTighe provides calibration charts in all our job specific maintenance manuals.

2. The oil can be removed by dropping a suction hose down the access manway into the oil layer. Off-load oil until layer is sufficiently reduced. Refill separator with clean water after oil removal.

3. Refer to Oil Removal Options in Catalog Section 4 for more details on other oil removal configurations McTighe provides. If oil removal is automatic via skimmer or pump, influent flows can re-establish operating level in the unit.

G. WARNINGS

1. THIS SYSTEM MUST BE PROPERLY VENTED BY PURCHASER IN ACCORDANCE WITH GOVERNING SAFETY CODES FOR EXIT OF COMBUSTIBLE GASES WITH RESPECT TO ENVIRONMENT AND SPECIFIC LOCATION TO INCLUDE USE OF FLAME ARRESTERS IF NECESSARY.

2. THIS SYSTEM MUST BE PROPERLY GROUNDED BY PURCHASER AS MAY BE REQUIRED BY GOVERNING CODES AND EQUIPMENT LOCATION. REFER TO LOCAL ELECTRICAL CODES.

3. PURCHASER MUST INSURE THAT THE FINAL STATE OF ALL WIRING IS IN ACCORDANCE WITH THE U.S. N.E.C. AND LOCAL CODES FOR LOCATION AND SERVICE INTENDED.

4. PERSONS SERVICING SEPARATOR MUST EMPLOY ALL SAFETY INSTRUCTIONS TO INCLUDE USE OF APPROVED BREATHING EQUIPMENT, PROTECTIVE CLOTHING, SAFETY EQUIPMENT AND EXTERIOR SAFETY PERSONNEL AS MAY BE DETERMINED BY THE PURCHASER FOR THE PROCESS PRODUCT.

5. CAUTION: SEPARATED PRODUCT AND VAPORS ARE FLAMMABLE!!!

6. ELECTRICAL CONNECTIONS, ELECTRIC MOTORS AND WIRING MUST BE APPROPRIATELY PROTECTED FROM SUBMERGENCE AND INFILTRATION IN HIGH MOISTURE LOCATIONS. METHODS AND LOCATIONS SHOULD BE COMPATIBLE WITH YEARLY ENVIRONMENTAL CONDITIONS.

7. CONTROL WIRING FROM LEVEL SENSOR TO CONTROL PANEL SHOULD BE 18 GAUGE COPPER WIRE OR, IF LONG DISTANCE, 16 GAUGE COPPER WIRE RUN IN STEEL CONDUIT. CONDUIT TO BE GROUNDED AT THE PANEL END AND SHOULD BE FREE OF INTERNAL MOISTURE. ELECTRICAL CONNECTIONS AND WIRING MUST BE APPROPRIATELY PROTECTED FROM SUBMERGENCE AND INFILTRATION IN HIGH MOISTURE LOCATION. METHODS AND LOCATIONS SHOULD BE COMPATIBLE WITH YEARLY ENVIRONMENTAL CONDITIONS.

NOTE: Item's #2, #3, #6 and #7 apply when electrical items are supplied with separator.