KYF Test
TR TR
esc

Please enter at least 2 characters in the search box

Searching...

Periodic Inspection of Pressure Vessels

Periodic inspection of steam and hot water boilers, air tanks and autoclaves: internal-external examination, hydrostatic tests, reported.

Periodic inspection of pressure vessels is the regular examination and testing of closed equipment operating above atmospheric pressure while holding steam, gas or liquid. Authorised engineers assess the body integrity, safety devices and tightness, typically at 1.5 times the working pressure and at intervals not exceeding one year.

Equipment in Scope

The pressure vessel group covers a wide range of equipment, each with inspection items tailored to its duty:

Operations During the Periodic Inspection

The inspection is carried out in multiple stages within a risk-based plan:

  • External examination: Detection of corrosion, deformation and leaks on the body, weld seams, insulation, supports and flanges.
  • Internal examination: After draining and opening the vessel, inspection of the inner surface for deposits, cracks, blistering and wear, with non-destructive testing where needed.
  • Pressure test: Verification of tightness and strength by hydrostatic test; the period is defined by the standard and vessel age.
  • Safety devices: Set-pressure of safety valves, accuracy of gauges, and testing of level and pressure alarm functions.
  • Thickness measurement: Calculation of corrosion rate and remaining life by ultrasonic measurement at critical points.

Legislation and Standards

Inspections are performed under Law No. 6331 and the Regulation on Health and Safety Conditions in the Use of Work Equipment. The technical basis is TS EN 13445 (pressure vessels), TS EN 12952/12953 for boilers, equivalent codes (ASME BPVC Section VIII) and the 2014/68/EU Pressure Equipment Directive (PED). Unless the standard states otherwise, the regulation requires pressure vessels to be inspected at least once a year.

Outcome and Reporting

At the end of the examination, a report signed by authorised engineers is issued, stating the compliance status, findings and rectification proposals. Vessels found non-compliant are recorded as "unsafe" with a recommendation to remove them from service. The report includes measurement values, calibration information of the devices used, inspection photographs and the next due date, creating documentable evidence for both ministry audits and insurance claim processes.

Risk in pressure vessels does not arise only from wall thinning: incorrect water treatment accelerates scale and corrosion, a frozen or mis-set safety valve cannot relieve pressure, and a vessel operating under excessive pressure develops fatigue cracks. Therefore our inspection programme also produces recommendations to the operator on water treatment, daily operator checklists and fault logging, alongside the engineering examination. For newly commissioned vessels, pre-installation documentation control (PED/declaration of conformity, characteristic nameplate) is performed and the first due date is started based on this data.

To build a single inspection programme for your entire pressure-vessel inventory and keep your reports compliant, you may contact our expert team via our contact page. This page is part of our Periodic Inspection Services.

Frequently Asked Questions

FAQ on Periodic Inspection of Pressure Vessels

Scope, legal duty, proof pressures and reporting of boiler and pressure vessel controls.

Steam and hot-oil boilers, heating boilers, autoclaves, boilers and hot-water storage, compressor air receivers, expansion tanks and hydrophore sets, plus textile dyeing vessels (dye jet, fixing boiler) and cooking kettles — closed volumes working above 0,5 bar. The assessment is made as a system: shell, safety fittings, plant connections and operating records together.

Yes. Under Law No. 6331 and the Work Equipment Regulation, pressure vessel inspection runs at intervals not exceeding one year, with the proof test at 1,5 times the operating pressure. Boiler Code practice completes internal inspection yearly, external every two years and the hydrostatic test every five years. Where the manufacturer manual gives a shorter period, it prevails.

Visual-corrosion and weld area examination, wall-thickness measurement (UT) where needed; set-pressure and condition check of safety valves, gauge accuracy, water level indicators with feed-blowlown controls, automation-safety chain trials (low water, over-pressure-alarm-cut), burner and combustion analysis, flue gas-emission measurement and insulation surface temperature control. A 1,5 times pressure tightness-proof test is applied when required.

A finding-levelled report is issued: correction suggestion and follow-up for minor defects; for unsafe equipment a written warning and out-of-service recommendation (thinned shell, failed safety valve, dead interlock) with the criticality clarified. Fit equipment receives a report and conformity label; proof-test and measurement values form the reference baseline of later controls. The report is part of the OHS file and shown in audits.