Maintenance & Reliability · SOP

Dust Collection Ductwork Leak and Static Pressure Check

This procedure ensures that dust collection ductwork is free of air leaks and that static pressure readings meet design specifications. Regular checks prevent fugitive dust, reduce fan energy consumption, and maintain capture velocity at hoods.

Estimated Time

60 min

Difficulty

Intermediate

Regulation

ANSI Z9.2 / NFPA 664

Version

1.0

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Purpose

The primary purpose of this standard operating procedure is to methodically inspect dust collection ductwork for air leaks and to measure static pressure at key points in the system. By identifying and sealing leaks and comparing static pressure readings against design values, maintenance personnel can restore system efficiency, reduce combustible dust hazards, and prolong the life of the fan and collection equipment.

Scope

This procedure applies to all metal, PVC, or flex ductwork used in industrial dust collection systems (including cyclone, baghouse, and cartridge collector configurations). It covers visual inspection, leak detection using smoke or soap solution, and static pressure measurement with a digital manometer. This SOP does not cover structural repairs of ducts or replacement of major components. It is intended for maintenance personnel, millwrights, and industrial ventilation technicians.

Safety Precautions

LOTOPerform lockout/tagout on the dust collector fan motor and any airlocks before opening access panels or drilling test ports. Verify zero energy state with a voltage tester.
PPEWear safety glasses, gloves, and hearing protection. If working at height, use a ladder or manlift and secure tools to prevent drops. Dust masks required if residual dust is disturbed.
DUSTEnsure the work area is free of combustible dust accumulations. Use grounded tools and avoid any ignition sources. If duct contains combustible metal dust, follow additional NFPA 484 precautions.
CONFDo not enter any confined spaces without proper atmospheric testing and a confined space permit. Only perform external ductwork inspection.

Required Tools & Materials

Digital manometer (inclined or magnehelic type) with hose and static pressure tips
Smoke pencil or incense stick for airflow visualization
Leak detection spray (soapy water in spray bottle) or hand‑held ultrasonic leak detector
Aluminum foil duct tape (UL‑181 or equivalent) for temporary sealing
Step ladder or scaffolding for access to overhead ductwork
Marker, notebook, and camera for documentation
Drill and ¼‑inch bit (if test ports are absent)
Personal protective equipment (safety glasses, gloves, hearing protection, dust mask)

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Procedure: Step-by-Step

1 Lockout/tagout the dust collection system. Confirm all energy sources are isolated and tag applied.

2 Perform a visual inspection of all accessible ductwork. Look for dents, gaps at joints, corroded seams, loose support hangers, and signs of dust leakage (dust trails around joints). Mark any suspect areas with chalk or tape.

3 Select three or more static pressure test ports: one near the collector outlet, one at the midpoint of the main trunk line, and one at the farthest branch drop. If no existing ports, drill a ¼‑inch hole per manufacturer guidelines (avoid drilling into spiral seams).

4 Connect the manometer hose to the first test port. Zero the manometer while the system is off. Record the baseline static pressure.

5 Restore power, start the dust collector, and allow it to reach steady state (approximately 3–5 minutes). Note the fan speed and any abnormal noises.

6 Measure and record static pressure at each test port in inches of water gauge (in. w.g.). Compare readings to the design specification or baseline. A drop of more than 15% between the collector and the farthest port indicates leakage or blockage.

7 Using the smoke pencil or leak detection spray, trace all joint seams, blank flanges, access doors, and flexible connections. Watch for smoke being drawn into leaks or bubbles forming. Mark every leak location.

8 Shut down and lockout the system again. Seal all identified leaks with aluminum duct tape or appropriate mastic. For larger gaps, use a two‑part epoxy or metal patch and sheet‑metal screws.

9 Restart the system, allow it to stabilize, and re‑measure static pressure at the same test ports. Verify readings have improved (closer to design). If they haven’t, inspect for blockages or undersized ductwork.

10 Document all readings, leak locations, repairs made, and any recommendations for further maintenance or design upgrades. File the report in the maintenance management system or logbook.

Dust Collection Ductwork Leak and Static Pressure Check

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