Liquid Cooling Leak and Environmental Risk Assessment Malaysia

Liquid Cooling Leak and Environmental Risk Assessment Malaysia

Content

Liquid cooling can support high-density data-centre equipment, but it introduces risks that are different from those found in a conventional air-cooled server room.

A small leak may affect electronic equipment, flooring, cable routes or cooling performance. A larger incident may also involve worker exposure, environmental contamination, waste handling and prolonged downtime.

Before commissioning a liquid-cooled data centre in Malaysia, the operator should assess where leaks can occur, how they will be detected and what actions must follow an alarm.

Why Liquid-Cooling Leaks Require Planning

The impact of a leak depends on:

Cooling-system architecture

Fluid chemistry

System pressure

Total fluid volume

Leak location

Proximity to electrical equipment

Detection speed

Isolation capability

Drainage and containment

Staff response

Availability of replacement fluid

A leak should not be assessed only by the amount of visible liquid. A slow, hidden leak can create serious damage over time.

Understand the Cooling System First

Direct-to-Chip Cooling

Coolant flows through cold plates installed on high-heat components.

Potential leak points include:

Cold-plate connections

Quick-disconnect couplings

Flexible hoses

Manifolds

Distribution units

Pumps

Heat exchangers

Valves

Seals

Because these components may be located inside or close to server racks, early detection is important.

Immersion Cooling

Servers are immersed in dielectric liquid.

Risks may involve:

Tank leakage

Overflow

Fluid transfer

Server removal

Vapour or mist

Contaminated equipment

Fluid degradation

Spill during maintenance

The response depends on whether the system uses single-phase or two-phase cooling and on the fluid’s chemical properties.

Facility Water System

Leaks may occur from:

Chilled-water pipes

Cooling-distribution units

Heat exchangers

Condensate drains

Valves

Pumps

Pipe joints

Even when the water does not flow directly through the servers, a facility-side leak can interrupt cooling and threaten electrical infrastructure.

Step 1: Identify Every Potential Leak Point

Create a system diagram and mark:

Pipe joints

Flexible connections

Cold plates

Manifolds

Valves

Pumps

Filters

Heat exchangers

Drain points

Filling points

Sample points

Quick-disconnect fittings

Tanks and reservoirs

Pay special attention to locations that are:

Above server racks

Above power distribution

Inside raised floors

Behind equipment

Difficult to inspect

Subject to vibration

Frequently disconnected

Exposed to temperature cycling

Step 2: Determine the Fluid Hazard

Review the current Safety Data Sheet and technical data.

Identify:

Water-based or dielectric fluid

Electrical conductivity

Flammability

Flash point

Skin and eye hazards

Vapour or mist risk

Environmental persistence

Aquatic toxicity

PFAS classification where applicable

Spill-cleanup method

Disposal requirements

Do not assume that a dielectric fluid is harmless merely because it does not conduct electricity.

Step 3: Estimate Leak Volume and Release Rate

Consider several scenarios:

Seepage

A small leak at a seal, joint or coupling.

Possible effects:

Gradual fluid loss

Residue

Corrosion

Floor contamination

Hidden equipment damage

Minor Active Leak

A visible drip or continuous small flow.

Possible effects:

Local equipment exposure

Cooling-pressure reduction

Need for controlled shutdown

Maintenance and cleanup

Major Release

A failed hose, pipe, fitting or tank.

Possible effects:

Rapid coolant loss

Loss of cooling

Server shutdown

Electrical hazard

Large cleanup requirement

Environmental reporting or waste obligations

The detection and isolation strategy should account for each scenario.

Step 4: Assess Equipment Exposure

Identify what could be affected by a leak:

Servers

Rack power distribution units

Busways

UPS systems

Batteries

Network equipment

Fibre and copper cabling

Raised-floor systems

Sensors

Fire-detection equipment

Building finishes

Neighbouring tenants or spaces

Water-based and dielectric fluids may create different immediate electrical risks, but both can contaminate equipment and require controlled recovery.

Step 5: Install Appropriate Leak Detection

Possible detection methods include:

Leak-detection cable

Point leak sensor

Drip tray

Fluid-level sensor

Pressure monitoring

Differential-pressure monitoring

Flow imbalance

Reservoir-level trending

Visual inspection

Thermal imaging

Building-management-system alarm

A strong system normally uses more than one indicator.

For example, a leak cable may detect fluid on the floor, while falling reservoir level or unusual flow helps identify coolant loss before it reaches the cable.

Leak-Detection Cable

Leak-detection cable can cover:

Rack rows

Pipe routes

Cooling-distribution units

Raised floors

Tanks

Equipment perimeters

Before installation, confirm:

Compatibility with the coolant

Detection response

Cable zoning

Alarm-location accuracy

Reset procedure

Resistance to dirt and condensation

Inspection frequency

A sensor designed for ordinary water may not respond identically to every dielectric or glycol-based fluid.

Point Leak Sensors

Point sensors are useful in specific high-risk locations, such as:

Below a pump

Inside a drip tray

Under a cooling-distribution unit

Near a valve

Below a manifold

They are simpler than a long sensing cable but cover a smaller area.

Flow, Pressure and Fluid-Level Monitoring

A leak may be indicated by:

Unexplained reservoir-level reduction

Difference between supply and return flow

Falling loop pressure

Pump operation outside its normal range

Increased top-up frequency

Unusual differential pressure

Alarm settings should account for normal expansion, contraction and maintenance activity.

Step 6: Review Containment

Containment may include:

Drip trays

Bunds

Raised edges

Drainage

Double-wall pipes

Protective sleeves

Isolated rack sections

Fluid-resistant floor coating

Spill kits

The design should prevent liquid from flowing towards:

Electrical rooms

UPS and battery systems

Cable openings

Floor penetrations

Emergency exits

Public drains

Soil or groundwater

Drainage should not automatically discharge a specialised coolant into a normal sewer.

Step 7: Evaluate Environmental Consequences

A spill assessment should consider:

Total coolant volume

Chemical composition

Environmental persistence

PFAS content

Aquatic toxicity

Biodegradability

Waste classification

Contaminated absorbent materials

Contaminated water from cleanup

Soil or drain exposure

Recovery and recycling options

The coolant supplier should provide clear written disposal instructions relevant to the country of operation.

Step 8: Plan for Worker Safety

Employees and contractors may be exposed during:

Filling

Draining

Sampling

Filter replacement

Leak repair

Server removal

Spill cleanup

Disposal preparation

The procedure should specify:

Gloves

Eye protection

Protective clothing

Ventilation

Respiratory protection where required

First aid

Hand-washing facilities

Restricted access

Safety Data Sheet availability

Training should reflect the actual fluid, not a generic “coolant” category.

Step 9: Define Automatic Isolation

Depending on the system, a serious alarm may trigger:

Pump shutdown

Valve closure

Isolation of a rack or row

Transfer to a redundant cooling loop

Server-load reduction

Controlled equipment shutdown

Facilities-management notification

Automatic action must be carefully engineered. Stopping a pump may reduce fluid release but also cause rapid loss of cooling.

The isolation sequence should be coordinated with IT load management and redundancy design.

Step 10: Create an Emergency Response Procedure

A practical response plan should include:

Confirm the alarm location.

Identify the coolant involved.

Notify facilities and IT personnel.

Assess electrical and personnel risk.

Isolate the affected cooling section where safe.

Protect neighbouring equipment.

Contain the released fluid.

Prevent entry into drains.

Collect and label contaminated materials.

Repair and pressure-test the system.

Refill with approved coolant.

Verify cooling performance.

Document the incident and corrective action.

Contact details and responsibilities should be clearly assigned before an incident occurs.

Step 11: Keep the Correct Spill Kit

The required materials may include:

Fluid-compatible absorbent pads

Drain covers

Containment socks

Chemical-resistant gloves

Eye protection

Waste bags or containers

Labels

Cleaning tools

Portable lighting

Sampling containers

Confirm that absorbents and cleaning products are compatible with the coolant.

Water alone may not be the correct cleanup method for every fluid.

Step 12: Test the Alarm System

Testing should include:

Simulated point-sensor activation

Leak-cable response

Alarm transmission

Zone identification

BMS or SCADA notification

Valve or relay operation

Escalation to responsible personnel

Alarm reset

Event logging

A leak sensor that has never been functionally tested may provide false confidence.

Step 13: Inspect During Routine Maintenance

A routine inspection should check:

Couplings

Hoses

Gaskets

Pipe supports

Pumps

Valves

Filter housings

Cold plates

Manifolds

Drip trays

Leak sensors

Reservoir level

Pressure and flow

Staining or residue

Unusual odour

Corrosion

Floor condition

Thermal imaging may reveal abnormal temperatures, but it does not replace physical leak inspection or dedicated sensors.

Step 14: Monitor Pump Condition

Cooling pumps are critical rotating assets.

Useful checks include:

Vibration

Bearing temperature

Motor current

Flow

Pressure

Differential pressure

Seal condition

Unusual sound

Increasing pump vibration may be related to:

Bearing wear

Misalignment

Cavitation

Looseness

Air entering the loop

Flow restriction

Pump-condition monitoring can reduce the risk of cooling interruption and mechanical leakage.

Step 15: Verify After Repair

Before returning the system to normal operation:

Confirm the correct replacement material

Pressure-test the repaired section

Inspect for further leakage

Remove trapped air

Check coolant level

Confirm flow and pressure

Verify supply and return temperature

Test alarms

Check electrical equipment

Update maintenance records

If coolant was replaced or mixed, verify that the new fluid meets the approved specification.

Information to Record

Maintain records of:

Coolant brand and type

Batch number

Fill date

Total volume

Top-up quantity

Fluid-analysis results

Leak incidents

Repair location

Alarm response

Waste quantity

Disposal contractor

Corrective action

Sensor test results

Repeated small top-ups may indicate an undetected leak and should not be treated as normal consumption without investigation.

Risk-Assessment Questions

Before commissioning, confirm:

What is the maximum possible release?

Can the fluid reach electrical equipment?

Can it enter a public drain?

How quickly will it be detected?

Which section can be isolated?

How long can equipment operate after cooling loss?

Is redundant cooling available?

Is the correct spill kit on site?

Are replacement fluid and spare parts available?

Have staff practised the response?

Who manages contaminated waste?

Does the incident require external notification?

Instruments for Data Centre Liquid-Cooling Inspection

Useful measurement categories include:

Thermal imaging cameras

Contact temperature meters

Temperature data loggers

Flow and pressure instruments

Differential-pressure meters

Electrical testers

Water-quality meters

Leak-detection sensors

Vibration meters

Network and cable testers

Temperature and humidity monitors

Instrument selection depends on the cooling architecture and coolant chemistry.

Data Centre Testing Instruments from MTM Precision

MTM Precision supplies instruments for data-centre commissioning, inspection and maintenance in Malaysia.

Relevant products include:

NOYAFA NF-522 thermal imaging camera

Temperature and humidity meters

Temperature and humidity data loggers

Differential-pressure instruments

Airflow meters

Clamp meters and electrical testers

Water-quality instruments

Leak-detection equipment

Vibration meters for pumps and cooling machinery

NOYAFA NF-8209 Pro and NF-8506 network cable testers

NOYAFA NF-IPC728HSO CCTV and network tester

A complete liquid-cooling assessment may require several instruments because temperature, electrical condition, fluid quality, leakage and pump performance are separate risks.

Contact MTM Precision

MTM Precision Sdn. Bhd. (744811-A)

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com / enquiry@mtmpre.com.my

Website: www.mtmpre.com.my

Visit our Puchong Showroom & Service Centre for data-centre testing instrument selection, product demonstration and technical support.

Operating hours: Monday to Friday, 9:00 AM–6:00 PM.