🔧 What is Vacuum Excavation?

The VAC-EX AIR-EX is a pneumatic vacuum excavation unit that uses compressed air to break up and displace soil, which is then vacuumed into an on-board debris tank. It is used for exposing buried utilities, drainage excavation, and precision digging in confined or sensitive areas where traditional mechanical excavation poses a risk of damage.

📋 Key Regulations

• PUWER 1998 — Provision and Use of Work Equipment Regulations: operators must be trained and competent before use
• HSG47 — Avoiding Danger from Underground Services: safe excavation near buried utilities
• CDM 2015 — Construction (Design and Management) Regulations: safe system of work requirement
• COSHH — Control of Substances Hazardous to Health: managing dust and contaminated spoil
• LOLER 1998 — Lifting Operations (if hose lifting attachments are used)

✅ Training Programme

This two-part programme consists of:

🔩 Main Components

⚙️ Key Technical Specifications (AIR-EX)

• Power source: petrol/diesel engine or electric motor (model dependent)
• Air pressure: adjustable — typically 6–10 bar (refer to site-specific settings)
• Vacuum: high-volume, high-velocity air flow
• Debris tank capacity: refer to manufacturer plate on your unit
• Boom/hose reach: refer to unit specification — do not over-extend
• Operating weight: refer to manufacturer plate — ensure ground can bear load

🦺 Mandatory PPE

The following PPE must be worn at all times during vacuum excavation operations:

⚠️ Additional PPE — Specific Conditions

• Hearing protection — required when compressor noise exceeds 85 dB(A); check noise assessment
• Full face shield — when working with high-pressure air near concrete, stone or compacted fill
• Disposable coveralls — when ground is known or suspected to be contaminated
• Chemical-resistant gloves — when handling contaminated spoil

🔍 Before Every Shift — Check All Items

A pre-start inspection must be completed and recorded before operating the VAC-EX. Do not operate the machine if any check fails — report to your supervisor immediately.

🔧 Machine Condition

• Check fuel / power level — do not operate with low fuel
• Check engine oil level — top up if required
• Check hydraulic fluid level (if applicable)
• Inspect all hoses for cracks, splits, kinks, or damage
• Check hose couplings and connections are secure — no leaks
• Inspect the air lance and nozzle — no blockages, no damage
• Check filter system — clean or replace filter as required
• Inspect debris tank — empty if full, check for damage, lid seals intact
• Check all guards and safety covers are in place
• Check emergency stop is functional before starting work

🏗️ Site & Environment

• Confirm utility drawings / service plans are available and reviewed
• Confirm CAT & Genny scan has been completed — locate all services
• Check ground conditions — waterlogged, unstable, or sloping ground requires risk assessment
• Ensure exclusion zone is set up around the work area
• Check overhead hazards — overhead power lines, structures
• Confirm safe spoil disposal area is identified

🛠️ Setting Up for Operation

• Position the machine on firm, level ground within safe hose reach of the excavation point
• Set up exclusion zone — minimum 2 m radius around active excavation; extend if projectiles are possible
• Brief all nearby workers on the operation before starting
• Connect hoses and check all couplings before starting the engine
• Start machine and allow to reach operating pressure before beginning excavation
• Check pressure gauge — set to appropriate pressure for soil type (lower near confirmed services)

⛏️ The Six Excavation Techniques

📌 During Operation

• Keep the suction hose close to the excavation point to capture all loosened material
• Never point the air lance at people, equipment or vehicles
• Monitor debris tank level — do not allow to overfill
• Stop immediately if you see a service, pipe, cable or duct — do not attempt to continue past it
• If a service strike occurs: stop immediately, secure the area, inform supervisor, follow emergency procedure
• Do not leave the machine unattended while running

🔴 Shutdown Procedure

• Reduce air pressure and allow system to depressurise before disconnecting hoses
• Switch off vacuum unit before disconnecting suction hose
• Close all valves — never leave pressurised hoses unattended
• Shut off engine / isolate power supply
• Remove and clean the nozzle and lance tip
• Inspect hoses and couplings for wear or damage — record any defects
• Stow all equipment securely before moving the machine

🗑️ Spoil Disposal

• Empty debris tank only at the designated spoil disposal area agreed before work starts
• If spoil is suspected to be contaminated (e.g. near a former industrial site), it must be handled as hazardous waste — separate containment, appropriate labelling, licensed disposal contractor
• Do not allow spoil to be deposited near watercourses, drainage, or public areas
• Complete waste transfer note if spoil leaves site

🔧 Daily Maintenance

• Clean filter after each session — blocked filters reduce performance and can cause engine damage
• Check and clean suction hose — remove blockages before storing
• Inspect all seals, gaskets and couplings
• Check and top up engine fluids as required
• Record any defects or damage in the machine log — do not return a defective machine to service without repair
• Report any damage to services or near-miss incidents — use your site incident reporting procedure

✅ What You Must Always Do

• Complete the pre-start checklist before every shift
• Ensure CAT & Genny scan and service plans are reviewed before any excavation
• Wear full PPE — especially eye protection whenever the air lance is active
• Use pulsing or sweeping technique near buried services
• Monitor the debris tank and never overfill
• Depressurise fully before disconnecting hoses at shutdown
• Record defects and report any near-miss or service strike immediately

🚫 What You Must Never Do

• Never operate without completing pre-start checks
• Never excavate without confirming service locations first
• Never use the dowsing technique near confirmed or suspected buried services
• Never point the air lance at people or equipment
• Never leave a pressurised, running machine unattended
• Never disconnect hoses under pressure
• Never continue past a discovered service — stop and report

📋 Legislation Summary

• PUWER 1998 — Operator must be trained and competent
• HSG47 — Safe excavation near underground services
• CDM 2015 — Safe system of work, site planning
• COSHH — Dust and contaminated spoil management