Hazardous Area Electrical Training for Oil and Gas

The oil and gas industry is the single largest employer of CompEx-certified electrical workers in the UK and globally. From upstream exploration and production through midstream processing and transportation to downstream refining and distribution, oil and gas facilities are characterised by extensive hazardous areas requiring qualified personnel who understand and can apply the IEC 60079 standards.

Why Oil and Gas Needs CompEx

Oil and gas facilities handle flammable hydrocarbons at every stage of their operations. Hazardous areas arise wherever these substances can escape into the atmosphere in sufficient concentration to form an explosive mixture. Zone 1 and Zone 2 areas are found around:

• Wellheads, manifolds, and Christmas trees — primary sources of hydrocarbon release
• Separation trains and process vessels — where gas is released during normal operation
• Pump and compressor seal areas — secondary release sources
• Loading and unloading facilities — tanker and ship connections
• Storage tanks — vapour spaces and vented areas
• Flare systems and vent stacks — controlled release areas
• Gas treatment and compression areas

Regulatory Framework — DSEAR and Beyond

In the UK, hazardous area electrical work is governed primarily by the Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR), which requires employers to:

• Carry out a risk assessment of workplaces where explosive atmospheres may occur
• Classify areas into zones based on the likelihood of an explosive atmosphere
• Ensure only appropriately certified equipment (ATEX/UKEX) is used in classified areas
• Ensure that persons carrying out work on Ex equipment are competent

For offshore installations, additional regulations apply — the Offshore Installations (Prevention of Fire and Explosion, and Emergency Response) Regulations 1995 (PFEER) place additional duties on dutyholder management of explosion risks.

Gas Groups in Oil and Gas

The gas group classification of oil and gas sites depends on the specific hydrocarbons present:

Most onshore UK oil and gas production facilities and refineries operate primarily in IIA and IIB gas groups. Offshore platforms often have both IIB and IIC areas due to the presence of fuel gas handling systems. This is why many offshore electricians hold Ex02 and Ex04 in addition to Ex01 and Ex03.

Types of Ex Equipment Found in Oil and Gas

Oil and gas facilities contain the full range of Ex equipment types — giving CompEx candidates broad practical exposure:

• Ex d motors — on process pumps, compressors, fans, and agitators
• Ex de local control stations — at motor starters, pump control points
• Ex e junction boxes — throughout cable tray and trunkline systems
• Ex d isolators — at motor isolator points
• Ex ia instruments — pressure transmitters, temperature sensors, level gauges
• Ex p control panels — MCC rooms, relay panels, DCS interface cabinets in or adjacent to Zone 1
• Ex d and Ex e luminaires — throughout process and utility areas

Preparation for Oil and Gas Hazardous Area Work

EX Academy's inspection simulations and equipment selection scenarios are modelled on oil and gas facility scenarios — the equipment types, zone classifications, and gas groups are drawn from real offshore and onshore oil and gas installations. Simulation 01 (Ex d motor — Zone 1 IIB T4) directly reflects the most common oil and gas inspection scenario. Selection Scenario 03 (Ex de LCS — Zone 1 IIC) covers the hydrogen compressor deck scenario common on offshore platforms and gas processing facilities.