Periodic Ex-Proof Inspections

Short answer: Periodic Ex-proof inspections are examinations that verify that electrical installations and equipment in explosive environments remain safe over time. These are carried out visually, up close, and in detail, in accordance with IEC 60079-17.

Even a perfectly installed explosion-proof system can lose its protective properties over time due to corrosion, vibration, moisture, and unauthorized modifications. This loss progresses imperceptibly.

The only mechanism that proves a facility remains as safe in the fifth year as it was on the first day is periodic inspection. This also guarantees the validity of the Explosion Protection Document.

What is done during a periodic inspection?

Visual, close and detailed inspection levels (IEC 60079-17)
Verification of protection type (Ex d, e, i, t) integrity.
Cable glands, gaskets and leak test.
Grounding, labeling, and detection of improper modifications.
Reporting of findings and corrective recommendations.

Three Inspection Levels

IEC 60079-17 categorizes inspections into three levels based on their depth. Visual inspection involves identifying external defects (broken, loose screws, missing gaskets) without disconnecting power or using instruments. Close inspection is more detailed and performed using tools such as ladders, but without opening the equipment. Detailed inspection involves disconnecting power to the equipment, opening the covers, and testing the internal piping for moisture, corrosion, and malfunctioning protections using instruments. The inspection period and level are determined according to the risk level and environmental conditions of the region; severe conditions require more frequent and deeper inspections. AES conducts these inspections under TÜRKAK accreditation.

Legal Framework and Assessment

Periodic inspections of explosion-proof structures are mandatory under IEC 60079-17 and explosive atmosphere regulations; these inspections are carried out by authorized personnel and documented with a TÜRKAK accredited report.

Frequently Asked Questions

How often are explosion-proof checks performed?

Determined on a risk-based approach; at intervals not exceeding three years after the initial examination, and more frequently in severe conditions.

Is visual examination sufficient?

No; internal corrosion and deteriorated protection can only be detected through a detailed inspection.

How is control related to PKD?

Regular inspections are necessary to maintain the validity of the Explosion Protection Document.