EMTOS Quarterly Preventative Maintenance Report
This report documents the quarterly preventive maintenance performed on EMTOS equipment, including inspections, servicing, and identified issues, to support reliable operation and timely corrective action.
Envent Corporation
09/30/2026
EMTOS Quarterly Preventative Maintenance Report
This quarterly preventative maintenance shall be performed to ensure the equipment operates reliably and safely between annual inspections. Inspectors should check all critical systems, verify proper operation of controls and safety devices, clean accessible components, inspect for wear damage, and document any issues for corrective action.
Procedure Max Score: 187
EMTOS Quarterly PM
Unit #
Date
License Plate #
Inspectors
Unit Hours Start
Meter name
Unit
Air Compressor Hours Start
Gas Meter Start
Is the car seal installed and intact on the main panel, with no signs of tampering or unauthorized entry?
if the answer is "noneOf [PASS]"
Check that the SO cord is connected and snug inside of the panel before energizing power to the unit.
if the answer is "noneOf [PASS]"
Check for any loose wires or disconnected wires. Reinstall and tighten to spec.
No Power on Unit: Generator disconnected
Trailer
Inspect Trailer Kingpin
Check for visible cracks, deep gouges, or severe condition
if the answer is "oneOf [FAIL]"
Inspect upper coupler plate for warping, bowing, or thin spots
if the answer is "oneOf [FAIL]"
Inspect welds connecting kingpin to trailer for signs of weld failure or cracking
if the answer is "oneOf [FAIL]"
Upload photo of kingpin upon completion of passed inspection.
Add or drag pictures
Inspect trailer tires and lights
Check tires for proper inflation and dry rotting or damage.
Inspect all lights for proper operation (running lights, turn signals, brake lights).
Pull break away wire and verify the trailer breaks work by driving truck forward.
Inspect trailer support
Inspect leg stands and grease Zerk fittings.
Check firebox to trailer bolts and holes for integrity.
Vaporizer
Check vaporizer thermocouple and make sure connections are secure (recrimp if necessary).
Check controller to ensure the knob can be fully turned into all positions.
Check silicone integrity around pilot ignitor transformer.
Open inlet Y strainer to check for propane butter. Depressurize line before breaking.
Remove 6-screw top cover to inspect refractory and doughnut gasket. Verify gasket is seated properly and clear of tank spacing.
Main Electrical Panel
Tighten every wire termination to 1.2 Nm torque.
Remove BMS and check terminations.
Check for open holes.
Signs of rust or water.
Inspect panel door gasket & conduit opening integrity.
Add desiccant packs if missing or replace if saturated.
Inspect wire condition (no wire rubbing against sharp edges).
Ensure spiral wire wrap is placed correctly to protect wires.
Ensure wire tie downs are operational, replace if necessary.
Ignitor Panel
Tighten every wire termination to 1.2 Nm torque
Check for open holes in each panel.
Signs of rust or water.
Inspect panel door gasket & conduit opening integrity.
Add desiccant packs if missing or replace if saturated.
Inspect wire condition (no wire rubbing against sharp edges)
Ensure spiral wire wrap is placed correctly to protect wires.
Ensure wire tiedowns are operational, replace if necessary.
Electrical Panels (Open all Panels and Perform the following Tasks)
Tighten every wire termination to 1.2 Nm torque (10.6 lb-in)
Remove BMS and check terminations.
Check for open holes in each panel.
Signs of rust or water.
Inspect panel door gasket & conduit opening integrity.
Add desiccant packs if missing or replace if saturated.
Inspect wire condition (no wire rubbing against sharp edges)
Ensure spiral wire wrap is placed correctly to protect wires.
Ensure wire tiedowns are operational, replace if necessary.
Chart Recorder
Verify plug connections and wires are tight for power, thermocouples input 1 & 2, alarm outputs, output control and ground terminals.
Visually verify all ribbon cables are landed securely.
Verify input cards are seated correctly and free or corrosion or damage.
Rotary Gas Meter (Totalizer)
Drain oil in all three chambers and refill (left, right, and center).
Inspect and replace screen paper gasket on the inlet side and regular paper gasket on the outlet side.
Flow Tubes
Remove all DS-300/400 and blow out with shop air, inspect, and reinsert or replace.
Firebox
Remove manway door and inspect refractory on floor, roof, walls, process inlet, and burner.
Burner
Inspect burner damper and linkage assembly (wiggle linkage).
Clean burner site glasses.
Combustion Blower
Visually inspect all blower mounting bolts for rust and tightness.
Maxon or Eclipse Valves (SSOV 1&2)
Inspect all valve covers and gaskets are in place and tight. If gasket integrity is compromised replace gasket.
Inspect landed wires on the valve terminal block are in good condition.
Ensure that all connections are tight and wiring is not frayed.
Open side cover plate and verify that no water, debris, or foreign mater. If there are signs of water intrusion, get with engineering to inspect further and give path forward on repairs.
Manual Butterfly Valves
4" Process Valve: Open gear assembly and grease gears.
Main Process Valve: Open gear assembly and grease gears.
Dilution Valve: Open gear assembly and grease gears.
Automatic Process Isolation Valve
Visually inspect mounting hardware and support brackets for signs of stress or wear.
Process Blower
NYB Blower Alignment Checks
This procedure outlines the steps for performing quarterly alignment checks on NYB Blowers, ensuring all components are properly aligned and the area is safe and clean post-inspection.
Pre-Inspection Setup
Alignment Inspection
Measure Blower Housing Centering at Pillow Blocks
Using a tape measure, measure the distance from the outside edge of each pillow block bearing housing to the edge of the blower housing at all four measurement points (top, bottom, left, and right, or as applicable to the equipment configuration). Record each measurement and compare the values to verify the blower rotor and shaft assembly are centered within the housing.
When taking measurements:
if the answer is "oneOf [Record all measurements to the nearest 1/16 inch (or applicable site standard).]"
Record Measurements:
Is the alignment within the acceptable range?
Post-Inspection Tasks
Reinstall the Shaft cover.
Was the area cleaned after inspection?
NYB Blower Bearing Lubrication
This procedure outlines the steps for purging the bearings of an NYB blower, including inspection, cleaning, lubrication, and testing.
Preparation
Inspection and Cleaning
Inspect bearings and bushing
Lubrication
Remove the tubing from the grease injection points on each bearing to allow direct access to the grease fittings and to verify that grease can flow freely into the bearing. Inspect the tubing, fittings, and connectors for restrictions, hardened grease, contamination, damage, or blockages that could prevent proper lubrication.
if the answer is "noneOf [PASS]"
If any tubing is damaged, kinked, or plugged, replace it before returning the system to service.
This ensures hardened, contaminated, incompatible, or degraded grease is removed from the lubrication path and that the tubing is completely charged with fresh grease.
Visually inspect the discharged grease for signs of contamination, moisture, dirt, discoloration, or metal particles that could indicate lubrication or bearing issues.
Greasing a stationary bearing can rapidly build internal pressure, forcing grease against the seals and potentially causing seal damage or seal blowout. Excessive pressure can also lead to overheating, premature bearing failure, and reduced lubricant effectiveness. If shaft rotation cannot be achieved, stop the lubrication activity and consult maintenance supervision before proceeding
This also helps prevent contamination from being drawn back into the bearing.
The appearance of fresh grease confirms that old grease has been displaced and the bearing cavity has been replenished.
Vapor Seal Lubrication
The vapor seal lubrication point and the bearing grease fitting are separate components. Do not introduce anti-seize into the bearing grease fittings, grease lines, or bearing housing. Anti-seize contamination will damage the bearing lubricant, accelerate wear, and can lead to premature bearing failure. Bearings shall only be lubricated with Mobilgrease XHP 222 (Blue) grease.
The vapor seal is located between the bearing housing and the blower casing where the shaft enters the the housing. Its purpose is to prevent process vapors from migrating along the shaft and reaching the bearing assembly. The fitting closest to the fan housing is typically the vapor seal lubrication point. The fitting located on the bearing housing is the bearing grease fitting. Always verify fitting locations before adding any lubricant. Verify the correct lubrication point before applying lubricant.
Shaft Cover Install
Prior to reattaching the blower cover, inspect all mating surfaces, gaskets, O-rings, and sealing areas for damage, debris, corrosion, or residual gasket material. Clean the sealing surfaces as necessary to ensure a proper seal and prevent air leakage. Replace any damaged gaskets, O-rings, or sealing components before reassembly. Carefully position the blower cover onto the housing, ensuring it is properly aligned with the locating features and does not contact the rotor, shaft, or internal components during installation. Install all mounting hardware finger-tight initially to ensure the cover seats evenly against the housing. Tighten mounting bolts in a crisscross or star pattern to evenly distribute clamping force and prevent cover distortion. Torque all fasteners to the manufacturer's specification where applicable. Verify that no tools, rags, hardware, or foreign material remain inside the blower housing prior to fully securing the cover.
After the cover is installed:
Testing
Turn on the blower, let it run for 15 minutes, and take temperature of bearings. Bearing Temp should not exceed 200F in Ambient conditions.
Does the blower make unusual screeching sounds after the first 5 seconds of startup?
if the answer is "oneOf [Yes]"
Check the belt Tension.
Power on Unit: Connect Generator and Propane
Air Compressor
Ensure a 0-150 PSI Pressure Guage is installed before the regulator.
Verify the compressor stops at ~135 PSIG in the main tank.
Panel Light Check
Activate each button and switch to confirm it lights up when turned on.
Area Lights
Inspect all area lights by turning them on, replace bulbs as needed, and check for rust or water damage.
Chart Recorder
Verify the display powers up with no error codes or flickering.
Pen & Paper Operation: Correct date and time stamp, legible temperature recordings.
Temperature Accuracy: Compare temperature reading with High Limit Controller and verify readings are within 50F of each other.
if the answer is "noneOf [PASS]"
Follow the Maintenance SOP Calibration and Thermocouple Replacement. Add a note if Thermocouple was replaced or Calibrated.
Output Control: Test output control by placing in manual and driving the mod motor with the arrow keys.
Alarm Outputs: At 1400F, verify the top green panel light turns on, and the Process Isolation Valve opens.
Alarm Outputs: At 1550F, verify the top red panel light turns on. If temperature cannot be raised above 1550F, adjust Alarm setpoints A2S1 and A2S2 below current temperature to simulate.
Process Isolation Valve
Raise unit above 1400°F and verify valve fully opens and closes promptly. If the valve takes more than 30 seconds to close, replace the air dump valve.
Rotary Gas Meter
Check Pressure gauges on rotary meter and read out gauges. Check differential pressure between gauge (In./H20) behind of main gas (pancake) regulator and first gauge on gas meter is less than 10" wc. If greater, change gasket screen on Totalizer.
Drain moisture in airline to actuator and verify actuator opens valve once temperature is above 1400F
Process Valve
Check integrity of 4" process bypass valve and 10" process valve by bringing unit above 1400F with both valves closed and verify no suction at inlet
Burner
Verify that the modulating actuator moves to high during the 90 second high fire purge and moves to low when the BMS says to start.
Firebox
Scan the entire exterior firebox wall with a temperature gun and record any areas exceeding 200°F.
Check bearing temperatures on Process Blower. Normal bearing housing temperature (temp-gun reading) should be stable and typically < 180°F (82°C). Investigate if temperature increases from the unit’s normal baseline, if one side is significantly hotter than the other, or if readings exceed ~180°F; treat ~200°F (93°C) as a do-not-run/notify supervision. Plan to replace bearings. Flag this inspection as fail.
Interlock Testing
Check all Interlocks on unit
High Limit Temperature
While BMS is going into purge, change the set point below the chart recorder temperature and verify a "stoppage" in BMS activity
While unit is running, lower high temperature set point below chart recorder temperature and verify burner shut down.
UV Scanner
While unit is running, remove UV scanner from unit. Do not expose to direct sunlight. Cover optical lens and ensure that the unit shuts down.
LEL Analyzer
Calibrate LEL in accordance with the procedures, verify analyzer is not bypassed by valves or by jumped wires behind LEL controller.
Test high LEL shutdown by lowering the setpoint to 0%. (Add a bias if current reading is 0%) Verify the unit shuts down. Remove any added bias.
Process Blower Pressure Switch
Open cover of pressure switch and verify that sensor is not jumped. Remove tubing from sensor and verify that interlock is tripped on BMS.
Verify on the pressure switch box that one wire is on common and one wire is on Normally Open.
Combustion Blower Pressure Switch
Open cover of pressure switch and verify that sensor is not jumped. Remove tubing from sensor and verify that interlock is tripped on BMS.
Verify on the pressure switch box that one wire is on common and one wire is on Normally Open.
FA Temperature Switch
Remove temperature switch. Wrap heating element around probe, set temperature to 410°F. Verify contacts open with ohms meter at 400°F. (Different from Test Fire)
Rotary Gas Meter
Drain oil in all three chambers and refill (left, right, and center).
Inspect and replace screen paper gasket on the inlet side and regular paper gasket on the outlet side.
Firebox, Main Panel, and Sapre Parts
Remove manway door and inspect refractory on floor, roof, walls, process inlet, and burner.
Scan the entire exterior firebox wall with a temperature gun and record any areas exceeding 200°F.
Verify that the modulating actuator moves to high during the 90 second high fire purge and moves to low when the BMS says to start
Verify Carseal is installed on Main Panel.
Take a picture and attach of the following in the comments of the work order.
PM Lead Closure Signature
PM Lead Sign Off
Quality Check Approval Signature (Shop Personnel)
Quality Check Sign Off (Shop Personnel)
Click here to sign
Source: Envent Corporation (Community Member)