Step 1/16 ·0 inspected

RTO

About this equipment

A Regenerative Thermal Oxidizer (RTO) destroys VOCs in process exhaust by routing flow through ceramic media beds that store and release heat, with switch/poppet valves alternating A-side and B-side flow through a common manifold and burner-fired combustion chamber. Inspections cover internal media/cold faces, valves and manifold, the burner and gas train, exhaust fan, dampers, and the electrical/pneumatic control cabinets.

#1 · Overall Unit

Capture overall RTO view and back view

Overall and back-side views document general condition and provide context for any localized findings.

Focus: Photograph the full unit and rear; note any external damage, leaks, hotspots, or housekeeping issues.

Severity signals (4)

no external issues → NONE
context shot referencing internal findings → LOW
visible external damage or rust/corrosion → HIGH
external hot spot - glowing metal or burned/missing paint → CRITICAL (do not touch; contact Durr)

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#2 · Internal Insulation / Refractory

Inspect internal insulation and refractory (chamber & tunnel)

Section 5.3 directs that internal conditions be documented with photographs. Cracked, loose, or separated ceramic-fiber insulation and hot spots indicate refractory degradation that can lead to shell hot spots and heat loss.

Focus: Through the access doors (cooled unit only), photograph combustion chamber and tunnel walls. Look for cracks, loose or separated insulation, sapping / hot-spot discoloration, and loose hardware.

Severity signals (4)

intact insulation, no cracks → NONE
minor surface cracking → LOW
loose/separated insulation or loose hardware → MEDIUM
hot-spot/sapping or exposed shell → HIGH (contact Durr)

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#3 · Heat Exchange Media

Inspect ceramic media bed hot face (top of bed)

The ceramic heat-exchange media is the heart of the RTO. Durr recommends photographing the media bed hot face on a regular basis (maximum 6-month interval) to trend its condition. Breakage or plugging raises pressure drop and degrades VOC destruction.

Focus: Photograph the top surface of each media bed. Look for cracked or collapsed ceramic blocks/saddles, loose surface dust, plugging by inorganic/alkali material, and an uneven bed surface. Compare the A and B beds.

Severity signals (4)

clean, intact, level bed → NONE
loose surface dust / light plugging → LOW
localized breakage or organic buildup → MEDIUM
excessive breakage or inorganic/alkali plugging → HIGH (contact Durr)

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#4 · Cold Face Screens

Inspect cold face / B-side screens (and post-cleaning condition)

Screens at the cold face must remain clean and intact for proper flow and heat recovery.

Focus: Verify screens are free of obstructing buildup, tears, or deformation; document cleaned condition after maintenance. Also inspect the cold-face media support surface for corrosion and organic/inorganic particulate or chemical attack.

Severity signals (4)

clean and intact → NONE
partial fouling → LOW
heavy fouling or tears → MEDIUM
corrosion or chemical attack on cold-face support → HIGH (contact Durr)

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#5 · Media Support

Inspect baffle plates at media support

Baffle plates support the media bed and distribute flow; damage or fouling can compromise media retention.

Focus: Check baffle plate condition for deformation, missing sections, or residual buildup, especially after screen cleaning.

Severity signals (2)

intact and clean → NONE
deformation or missing plates → HIGH

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#6 · Manifold

Inspect manifold interior for process buildup

Material buildup inside the manifold is the most recurrent defect on this fleet and can foul switch valves, the valve lift pancake cylinder, and valve spindle bearings.

Focus: Look at manifold interior walls and the zone around the switch valve, valve lift pancake cylinder, and valve spindle bearing for deposits, scaling, or accumulated process material.

Severity signals (3)

any visible deposits in manifold → MEDIUM
buildup contacting or restricting valve/cylinder motion → HIGH
clean walls → NONE

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#7 · Switch Valve

Inspect inlet baffle, valve face, and main valve seal ring

Valve face and main seal ring integrity determine switching seal quality; the inlet baffle directs flow.

Focus: Check the valve face and main valve seal ring for wear, scoring, distortion, or deposits; verify the inlet baffle is in place and undamaged. Seal rings are lubricated with molybdenum-disulfide and are inspected/repacked with the bottom taper-roller bearing at the 5-year interval - note any wear that warrants replacement.

Severity signals (4)

clean undamaged surfaces → NONE
deposits or wear on seal ring → MEDIUM
deformation or breach of seal ring → HIGH
worn seal rings at 5-yr service → replace

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#8 · B-Side Valve

Inspect B-side valve assembly

Each side valve must seal and switch reliably; document B-side condition separately from A-side.

Focus: Photograph and inspect the B-side valve for surface wear, buildup, and proper seating.

Severity signals (2)

no abnormality → NONE
deposits or surface damage → MEDIUM

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#9 · Switch Valve Drive

Inspect switch valve drive (AC drive, spur gears, lift cylinder, sensors)

The electric switch-valve drive - AC drive, gearbox, spur gears, pneumatic lift (pancake) cylinder, and stop/crawl proximity sensors - alternates the beds about every 3 minutes. Faults here halt RTO operation.

Focus: Confirm the AC drive housing, mounting, and wiring are sound with no fault indicators. Inspect the valve-drive spur gears for tooth wear, the pneumatic lift (pancake) cylinder for piston-seal/air leaks, and the stop/crawl proximity sensors for the correct ~4 mm gap and intact targets.

Severity signals (3)

drive, gears, cylinder, and sensors all nominal → NONE
loose mount/wiring or minor gear wear → MEDIUM
excessive spur-gear wear, lift-cylinder seal leak, or non-functional drive → HIGH (Durr technician only)

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#10 · Pressure Cabinet

Inspect pressure cabinet interior

Pressure cabinet houses pneumatic and electrical components that drive valve lift and switching; integrity is essential.

Focus: Open and document cabinet interior; check for leaks, loose fittings, damaged wiring, and overall cleanliness.

Severity signals (3)

clean, no leaks, orderly → NONE
minor leak or loose component → LOW
active pneumatic leak or electrical fault → HIGH

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#11 · Burner

Inspect burner stone, nozzle, gas train, transmitter, mount, and combustion air damper

Burner inspection covers all combustion-side components that must be intact for stable, safe firing.

Focus: Verify burner stone integrity, nozzle condition, gas train tightness/leaks, gas transmitter function, burner mount, and combustion air damper position. Observe the burner flame through the sight port for stability and shape (weekly check); see the spark-ignitor step for ignition components.

Severity signals (4)

all components nominal → NONE
minor wear or soot → LOW
unstable, lifting, or sooty flame → MEDIUM
cracked stone, deteriorated nozzle, or gas train leak → HIGH

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#12 · Spark Ignitor

Inspect spark ignitor

The spark ignitor is a wear consumable replaced semiannually, or sooner if frequent flameouts occur. A cracked, fouled, or burned ignitor causes ignition failures.

Focus: Remove and photograph the spark ignitor tip. Check for cracked porcelain, a bent or burned electrode, and a coated/fouled probe. A coated but undamaged ignitor can be wire-brushed and reused; cracked/bent/burned must be replaced.

Severity signals (3)

clean, intact tip → NONE
light coating (cleanable) → LOW
cracked porcelain, bent or burned electrode → HIGH (replace)

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#13 · Gas Train

Verify inlet gas pressure gauge reading and stability

Unstable or low inlet gas pressure causes burner faults at high demand and is a HIGH-severity reliability concern.

Focus: Read inlet gas pressure gauge at high burner demand; watch for drops below 50" w.c., recurrent low-gas-pressure faults, and whether the plant regulator is already at its maximum.

Severity signals (3)

stable, well above 50" → NONE
marginal fluctuation → MEDIUM
drops below 50" with faults / regulator maxed → HIGH

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#14 · Exhaust Fan

Inspect main exhaust fan (wheel, housing, bolts, drive)

The VFD-controlled main exhaust fan draws solvent-laden air through the RTO. Wheel/housing wear or corrosion and loose mounting are reliability and safety concerns.

Focus: Photograph the fan wheel, inlet cone, and housing for wear, erosion, corrosion, or material buildup. Check foundation/wheel bolts and set screws, and (if belt-driven) belt alignment/tension and coupling alignment.

Severity signals (3)

clean, no wear or corrosion → NONE
light dust / surface rust → LOW
wheel, inlet-cone, or housing wear or corrosion → HIGH (contact Durr)

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#15 · Dampers & Actuators

Inspect isolation, fresh-air, and bypass dampers & actuators

The pneumatic isolation and fresh-air dampers fail closed on loss of power or compressed air and are key fire-safety devices; leakage can cause condensate buildup and a fire hazard (NOTE in Section 5.5).

Focus: Photograph each damper actuator, linkage, and shaft seal. Check for air leaks at cylinder shaft seals, loose or worn linkages, and correct open/closed position markings. Confirm dampers move freely and are not seized.

Severity signals (4)

actuators/linkages intact, no leaks → NONE
minor linkage play → LOW
shaft-seal air leak or worn linkage → MEDIUM
damper seized or failing to seal (condensate/fire path) → HIGH

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.

#16 · Compressed Air System

Check compressed-air filter/regulator and supply pressure

Compressed air operates the switch valve and pneumatic dampers. Below 65 psi the unit faults and shuts down; the working setpoint is 80 psi (5.5 bar).

Focus: Photograph the compressed-air filter bowl and regulator gauge. Check for water/debris in the bowl, drain the sump, and verify the gauge reads about 80 psi (well above the 65 psi shutdown threshold).

Severity signals (4)

~80 psi, clean dry bowl → NONE
moisture/debris in bowl → LOW
pressure drifting toward 65 psi → MEDIUM
below 65 psi (shutdown threshold) → HIGH

Step notes

Generic observations about this step — environment, recent service, sounds, smells. These are sent as context for every photo Luthier analyzes here.

No photos yet — use the action bar below.