Drilling Rigs

Drilling rig periodic inspection is the at-least-annual examination by authorised engineers of rotary, down-the-hole (DTH) and auger drilling machines used in foundation, geotechnical, water well, mining and piling works: guards of the rotating thrust organ, mast carriers, rope-chain brake gear, hydraulic integrity, operator protection structure and dust-noise exposure controls are examined. Drilling rigs are a rare work machine group combining mechanical energy (rotating rods, brittle wires) with chemical risk (crystalline silica dust).

Machine Structure and Risk Focus

A drilling rig consists of a carrier track-wheeled platform, mast, crowd-pull winches, rotary head or hammer, rod holder (spinner-chuck) and compressor-hydraulic units. The control focuses on these critical organs:

• Rotating organ guard: Contact-entrapment protection of the rotary kelly bar, bit connection and drive shafts — the limb caught by a loose glove-sleeve here is the leading source of severe amputations.
• Mast and hoist rope: Broken-wire-corrosion control of the rope, drum spooling, load brake and mast tilt sheave; verification of tipping prevention by carrier levelling (jacks) and track support condition.
• Hydraulic-hoses: Crowd cylinders, hose burst protection and leak scan; quick-coupling pin locks.
• Compression and air pressure: Compressor safety valve, periodic test of the air tank and hose-clamp integrity; kickback-blowout risk under high pressure during drilling.
• Dust-gas and control: Water-sealing dust suppression (silica), cabin pressure-air filter, levelling screen, strike-visibility cameras; emergency stop chain and operator seat switch.

Periodic Tests and Measurements

• Mechanical: Clearance-noise-vibration measurement of the rotary head, soundness of gear-belt covers, torque control of mast bolts.
• Rope-brake: Discard limits of the rope by broken-wire and diameter loss criteria; brake lining thickness and hydraulic holding (drift) test.
• Safety gear: Emergency stop function, cabin door interlock, overload alarm and automatic lock (jack) warnings; extinguisher and shutdown sensors.
• Occupational health: Crystalline silica sampling against the limit value, noise and vibration map; operator training and PPE audit.

Legislation and Standards

The control is made under Law No. 6331 with the self-propelled machinery annexes of the Work Equipment Regulation and the 2006/42/EC Machinery Directive. Technical references: machine safety of drilling equipment TS EN 791, general safety of earthmoving machinery TS EN 474-1 with type parts, rollover protection ISO 3471/ISO 10266, visibility ISO 5006, fluid power ISO 4413; the compressor side follows the Work Equipment Regulation's pressure vessel rules. On exposure the OEL Regulation's silica limit values and dust control rules govern.

Risks, Recommendations and Outcome

The frequent accidents are the entanglement of clothing-limb in the rotating rod with amputation, mast overturn, high-pressure air-water blowout and long-term silicosis. Tip prevention requires evaluating ground bearing capacity before drilling, fully extending the carrier jacks and verifying mast plumb with a laser. Facilities are recommended shift rotation-cover and emergency stop tests, hose-pressure control, managing the dust water via topping and periodic noise-silica sampling. At the end of the examination a signed report with findings and measurements is issued. Drilling controls are in our Construction Machinery group; see Cable Excavators and Trenchers, or contact us for your programme.