10-Exhibit B, Preventative Maintenance Checklist and Frequency.pdf

FY26-RFP-29

Boiler, Gas System, and Preventative Maintenance and Repair Services

Exhibit B, Preventative Maintenance Checklist and Frequency

NOTE: *** All work to be performed on both the Hot Water Boilers and Sludge Heaters unless otherwise noted***

ANNUALLY: Preventive Service Hot Water Boiler and Sludge Heater

☐ Check water level ☐ Open waterside & fireside of unit (Front Side Sludge Heaters)

☐ Clean fireside surfaces by brush or use a powerful vacuum cleaner and remove soot and brush soot from tubes by rodding them out ☐ Clean breeching. Inspect breeching, stack and remove any soot build up ☐ Clean waterside surfaces. Remove all hand-hole and man-way plates, inspection plugs from water column tees, crosses and float assemblies from water column. Thoroughly wash all waterside surfaces ☐ Visibly check both waterside and fireside for cracking, pitting, corrosion, erosion and scale ☐ Inspect tube sheet for evidence of leaking ☐ Repair minor cracks in refractory / burner throat wash and coat if needed ☐ Check flame ignition electrode and flame sensor / photocell and clean ☐ Install new gaskets and seal on Waterside and Fireside

☐ (***Boilers Only) Check oil storage tanks for sludge, water accumulation and level ☐ Check feed and blow-off connections ☐ Check fluid levels on all hydraulic valves; take positive corrective action if any leakage is apparent ☐ Check gauge glass for possible replacement ☐ Remove and recondition safety valves ☐ (***Boilers Only) Check condition and operation of fuel oil pump and compressor and compressor oil level ☐ Check amperage draw on blower motor, feed/recirculating water and (***Boilers Only) oil pump motor ☐ Empty and clean condensate receivers including all gas line drops (DO NOT INCLUDE FOR MCALPINE CREEK

WWTP)

☐ Check all electrical terminals for tightness ☐ Check linkages; ensure the linkage ball connectors have not worn out ☐ Check coupling alignment on methane gas compressors ☐ Check combustion efficiency on both fuels (***Boilers Only – Methane / Fuel Oil, Natural Gas) (***Sludge Heaters Only – Methane / Natural Gas) and adjust air/fuel ratio controls for optimum efficiency - MUST DOCUMENT THE

BEFORE AND AFTER RESULTS FOR MCALPINE CREEK WWTP

☐ Fill and perform Factory Mutual Insurance checks ☐ Meet with WTP and Inspector representatives and/or WWTP representatives ☐ Include quarterly service ☐ Submit written report of services performed ☐ At McAlpine Creek WWTP: Perform preventative maintenance on an annual basis using this checklist as a guide where applicable but use Exhibit B, Equipment Listing and plant equipment O&M manual to determine additional PM requirements per the manufacturer.

☐ Verify annual inspection has been performed North Carolina Department of Labor (NC DOL).

FY26-RFP-19

Boiler, Gas System, and Gas Safety Preventative Maintenance and Repair Services Exhibit B, Preventative Maintenance Checklist and Frequency

McAlpine Creek WWTP Only:

☐ Hot water expansion tanks

☐Check, inspect ☐ Hot water air separator

☐Check, inspect ☐ At McAlpine Creek WWTP: Perform preventative maintenance on an annual basis using this checklist as a guide where applicable but use Exhibit B, Equipment Listing and plant equipment O&M manual to determine additional PM requirements per the manufacturer.

QUARTERLY for Locations other than McAlpine WWTP, SEMI-ANNUALLY for McAlpine WWTP: Preventive Service Hot Water Boiler and Sludge Heater

*NOTE: Annual Preventive Service will replace one Quarterly and one Semi-Annually Preventive Service*;

Semi-Annually ONLY at McAlpine Creek WWTP

☐ Check water level ☐ Check that auxiliary equipment is running and operating properly ☐ Record all for each unit

☐ ____ Operating pressure ☐ ____ Operating temperature ☐ ____ Feed/recirculating water pressure ☐ ____ Feed/recirculating water temp ☐ ____ Stack temperature ☐ ____ (***Boilers Only) Oil pressure ☐ ____ (***Boilers Only) Oil temperature ☐ ____ (***Boilers Only) Oil atomizing pressure ☐ ____ Gas pressure

☐ ____ Hot water line ☐ ____ Supply temperatures ☐ ____ Return temperatures ☐ ____ Makeup water usage ☐ ____ (***Boilers Only) Amp draw blower motor ☐ ____ (***Boilers Only) Amp draw oil pump motor ☐ ____ Amp draw stack blower ☐ ____ Amp draw air compressor motor ☐ ____ Amp draw water pump motor

☐ Test and blow-down all units ☐ Low water cutoffs ☐ Feed-water controls

☐ Water column

☐ Clean gauge glass ☐ Check flame ignition electrode and flame sensor / photocell and clean ☐ Blow-down all units until clean water to purge possible sediment accumulation:

☐ Boiler / sludge heater units ☐ Water level controls

☐ (***Boilers Only) Chemical feed ☐ (***Boilers Only) Expansion tank

☐ Check breeching, stack, and damper ☐ Check oil/gas control valves & switches ☐ Check pressure regulating controls ☐ Check burner and test flame controls

☐ Check all door bolts for tightness ☐ Check operation of all motors ☐ Check condensate tank, pump, vent, and piping to boiler for leaks, corrosion, or erosion

☐ Check for tight closing of fuel valves / fuel and air linkages ☐ Ensure fuel does not flow through the fuel valve(s) when the burner is off

☐ Ensure all set screws on linkage are tight and securing linkage

☐ Check indicating and alarm lights ☐ Ensure alarm bell or horn sound on the appropriate shut down condition

☐ Burnt out or loose bulbs

☐ Check operating and limit controls / safety and interlock controls / water level controls ☐ Ensure controls shut burner down at set points and verify pressures and temperature on gauges

☐ Stop feed pump and allow control to stop boiler under normal low fire condition

FY26-RFP-19

Boiler, Gas System, and Gas Safety Preventative Maintenance and Repair Services Exhibit B, Preventative Maintenance Checklist and Frequency

☐ Check general condition of equipment for leaks, noise, vibration, unusual conditions (e.g., excessive heat) ☐ Check lubrication levels, if applicable ☐ Check combustion efficiency on both fuels and adjust air/fuel controls for optimum efficiency ☐ Record and perform combustion check on all fuels using combustion analyzer equipment at each cam position (Document the before and after test results for McAlpine Creek WWTP.)

☐ % CO2

☐ % O2

☐ %CO

☐ Stack temperature ☐ Gas pressure ☐ Oil pressure at burner

☐ High fire ☐ Low fire

☐ Submit written report of all services performed

☐ At McAlpine Creek WWTP: Perform preventative maintenance on an annual basis using this checklist as a guide where applicable but use Exhibit B, Equipment Listing and plant equipment O&M manual to determine additional PM requirements per the manufacturer.