Safety & Compliance · SOP
Condensation Dripping Response And Overhead Contamination Control
This procedure defines the immediate and systematic response to condensation dripping from overhead pipes, ductwork, roof decks, or other overhead structures in industrial facilities. It covers personnel safety, floor and equipment protection, root cause investigation, remediation, and preventive monitoring to eliminate recurrence and prevent contamination of the work area.
Estimated Time
45 min
Difficulty
Intermediate
Regulation
CSA Z432 / WorkSafeBC
Version
1.0
Purpose
To establish a standardized, repeatable process for safely containing and resolving condensation drips from overhead structures in industrial environments. Condensation on pipes, ducts, and roof decks can introduce slip hazards, contaminate production areas, damage equipment and inventory, promote microbial growth, and create unsafe electrical conditions. This SOP ensures that every occurrence is handled with the same rigour: immediate isolation, proper PPE, containment of the affected area, root cause diagnosis, corrective action, and documentation — reducing downtime, preventing recurrence, and maintaining a safe, compliant workplace.
Scope
This procedure applies to all facility personnel, maintenance technicians, and contractors working in or responding to areas where condensation dripping is observed from overhead surfaces — including but not limited to chilled water pipes, refrigerant lines, HVAC ducts, steam lines, sprinkler piping, structural steel, and roof decking. It covers both routine drips from known cold surfaces and unexpected drips that may indicate a new leak, insulation failure, or environmental change. This SOP does not cover active pressurized pipe leaks (which require immediate shutdown and pipe repair per the facility's Piping Maintenance SOP) or condensation inside enclosed equipment such as control panels or switchgear (which follow Electrical Equipment Moisture Remediation SOP). All trades and shifts shall follow this procedure when overhead dripping is reported.
Safety Precautions
- Lockout/Tagout is not typically required for condensation response, but ensure no overhead electrical hazards exist before deploying containment near energized equipment. If the drip is directly above electrical panels, disconnect power to the panels at the breaker and apply LOTO before proceeding with containment.
- Minimum PPE: hard hat, safety glasses, nitrile gloves, non-slip boots. Upgrade to Tyvek suit, full-face respirator (P100 or organic vapour cartridge based on contaminant assessment), and chemical-resistant gloves if the condensate is suspected to contain biological growth, chemical residues, or process contaminants. Always evaluate the source before entering the containment zone.
- When accessing overhead surfaces at heights above 3 m (10 ft), use a ladder rated for industrial use with a stabilizer bar, or an aerial lift with full-body harness and lanyard. Never climb on pipes, ductwork, or suspended ceiling grids. Ensure the floor below is dry and barricaded before positioning any access equipment.
- Do not use conductive extension poles, metal mop handles, or metal ladders near live electrical equipment. Use only non-conductive fibreglass or wood tools in wet areas. If water has contacted electrical equipment, do not touch the equipment — de-energize at the panel and tag out before proceeding.
- If the condensate originates from cooling towers, process vents, or areas with known microbial growth (mould, Legionella), treat as a biohazard. Restrict entry, wear full Tyvek suit with respirator, and disinfect all surfaces after containment. Dispose of all absorbent materials as biohazard waste per site protocols.
Required Tools & Materials
- Absorbent boom or spill containment sock (6 ft minimum length, 3 in diameter or larger)
- Polyethylene drop sheet (6 mil minimum thickness, 20 ft × 20 ft or sufficient to cover affected area with 1.5 m overlap)
- Duct tape (2 in wide, industrial grade)
- Extension pole with roller frame (12 ft minimum reach, non-conductive fibreglass)
- Industrial dehumidifier (200 CFM minimum capacity, with condensate pump)
- Infrared thermometer (non-contact, -20°C to 150°C range, ±1.5°C accuracy)
- Digital hygrometer/thermometer with data logging (accuracy ±2% RH, ±0.5°C)
- Mop bucket (20 L capacity), wringer, and cellulose mop head (clean, lint-free)
- pH-neutral industrial floor cleaner (concentrate, diluted per manufacturer instructions)
- Condensation prevention coating (anti-sweat epoxy or closed-cell foam tape with vapour barrier)
- Portable ventilation fans (2000 CFM each, with 25 ft power cord and GFCI protection)
- Personal protective equipment: safety glasses, nitrile gloves (8 mil or thicker), hard hat, non-slip boots (CSA-approved), Tyvek suit (if biohazard suspected), full-face respirator with P100 or organic vapour cartridges (as assessed)
- Barricade tape (red/white caution, 3 in × 1000 ft roll)
- Portable barriers or cone stands (4 units, 42 in minimum height)
- Incident report form (site-specific or digital)
Procedure: Step-by-Step
1
Evacuate and isolate the affected zone. Immediately evacuate all personnel from the area directly under the dripping condensation. Erect barricade tape or portable barriers at least 2 m (6.5 ft) beyond the outermost drip radius. Post "Caution: Overhead Contamination — Keep Clear" signage. Deny entry to all non-essential personnel. For drips that may contain biological or chemical residue (e.g., near cooling towers, process vents, or washdown stations), isolate HVAC supply diffusers in the zone to prevent aerosol spread.
2
Assess personal exposure risk and don appropriate PPE. Evaluate the likely composition of the condensate. Clear condensation on cold water pipes has low exposure risk. Condensate near process vents, cooling towers (potential Legionella), washdown stations, or drip pans may contain biofilms, metals, or chemical residues. Don at minimum: safety glasses, nitrile gloves, hard hat, and non-slip boots. For suspected biohazard or chemical content, upgrade to Tyvek suit, full-face respirator (P100 or organic vapour cartridge as appropriate), and chemical-resistant gloves. Verify PPE is undamaged and properly fitted before entering the containment zone.
3
Deploy primary containment to protect floor, equipment, and personnel. Roll out a polyethylene drop sheet (6 mil minimum) across the full floor area under the drip zone, extending at least 1.5 m (5 ft) beyond the visible drip perimeter. Overlap sheets by 300 mm (12 in) at seams and seal with duct tape. Place absorbent booms or spill containment socks around the perimeter of the drop sheet to capture any liquid that migrates beyond the plastic. If the drip is directly above live electrical equipment, do not place the drop sheet directly over the equipment — instead, create a tented diverter using the extension pole and roller frame to route condensate to a collection pail or away from the equipment. Confirm that no water bridges to energized components.
4
Measure and record environmental conditions. Using the digital hygrometer, measure and record ambient temperature and relative humidity at three points: directly below the drip, 5 m away at the same elevation, and at floor level. Using the infrared thermometer, measure and record surface temperature of the overhead structure or pipe where condensation is forming. Calculate the dew point temperature for the recorded ambient conditions using the standard Magnus formula or a psychrometric chart. Record all readings in the log. Condensation forms when surface temperature drops below the dew point of the surrounding air. Typical target: maintain surface temperature ≥ 2°C above dew point.
5
Contain and remove standing liquid from the floor. If any liquid has already accumulated on the floor before containment was deployed, use the mop and bucket with pH-neutral industrial cleaner to collect and wring out the liquid. Do not push liquid toward drains unless it has been confirmed to be clean water. If the liquid is suspected process condensate, vacuum it using a HEPA-rated wet/dry vacuum and dispose of the collection according to site hazardous waste protocols. After mopping, dry the floor area with clean, dry cellulose mop heads until the surface is visibly dry to the touch. Return the mop heads to the laundry or dispose of them as contaminated waste if chemical or biological exposure is suspected.
6
Identify and address the root cause of condensation. Inspect the overhead surface for insulation gaps, missing vapour barriers, cold bridging at hangers or supports, or poorly sealed penetrations. Common root causes: (1) chilled water or refrigerant pipes lacking insulation or with damaged vapour barrier; (2) uninsulated ductwork carrying cold supply air through a warm, humid space; (3) metal roof deck or skylight framing exposed to cold outside air with interior humidity; (4) steam or hot water pipes sweating due to low ambient temperature and high humidity. For each identified deficiency, take a photograph and note the location and condition. Apply corrective action: repair or replace damaged insulation, install vapour barrier tape at joints, apply condensation prevention coating (anti-sweat epoxy or closed-cell foam tape) on cold-bridging elements, or increase ventilation to lower ambient dew point.
7
Reduce ambient humidity and dry the overhead surface. Position portable ventilation fans to create cross-flow across the affected overhead area. If outdoor air is dry (dew point below 10°C), introduce 100% outdoor air through fans and exhaust to the outside. If outdoor air is humid, operate industrial dehumidifier(s) in recirculation mode at maximum capacity. Continue ventilation or dehumidification until the hygrometer reads relative humidity ≤ 60% in the affected zone. Direct the airflow upward toward the dripping surface to accelerate drying. Monitor surface temperature with the infrared thermometer every 15 min until the surface temperature is ≥ 2°C above the ambient dew point. This confirms that condensation will not reform under existing conditions.
8
Disinfect and decontaminate the affected surface (if required). If the condensate is suspected or confirmed to contain biological contaminants (biofilm, mould, Legionella, or general organic growth), apply a disinfectant approved for the specific pathogen (e.g., 0.5% hypochlorite solution for general biofilms, or quaternary ammonium compound for Legionella) using a low-pressure sprayer or mop. Allow dwell time per manufacturer instructions (minimum 10 min for most disinfectants). Rinse with clean water and allow to air dry. For chemical condensate, neutralize per the specific chemical's safety data sheet before rinsing. Capture all rinse water and dispose of as hazardous waste if applicable.
9
Remove containment and restore the area to service. Once the overhead surface is dry and no further condensation is forming, carefully remove the drop sheets by rolling them from the outside edges inward to trap any remaining drips. Dispose of used absorbent booms and drop sheets as per site waste protocols. Mop the floor a final time with clean water and pH-neutral cleaner to remove any film left by the plastic sheeting. Remove barricade tape and signage. Return any displaced equipment to its original position. Restore HVAC supply diffusers to normal operation. Perform a final visual inspection and record that the area is safe for normal operations.
10
Document the event, root cause, and corrective actions. Complete a Condensation Drip Incident Report including: date, time, location, estimated volume of condensate, suspected composition, environmental readings (temp, RH, dew point, surface temp), root cause identified, corrective actions taken, materials used, and personnel involved. Attach photographs of the affected area before and after remediation. Submit the report to the site safety coordinator and maintenance supervisor. Enter the event into the facility's preventive maintenance system with a recurring inspection task for the affected overhead area at a frequency of 30, 60, or 90 days depending on severity and recurrence risk.