Pressure Systems Inspections

Having your pressure systems and pressure vessels frequently inspected by ISI will ensure that you comply with all relevant PSSR regulations.

PSSR Inspection Services

At ISI, our pressure systems inspection services provide your company with the necessary certifications to allow you to operate your pressure systems safely and legally, and in order to adhere to the Pressure Systems Safety Regulations (PSSR 2000).

We will manage the PSSR inspection schedule for you and will let you know well in advance when inspections are due.

Inspector holding a device with a large gauge used for hydrostatic pressure testing.

More benefits of choosing our professional service include:

  • white tick icon Statutory plant survey to identify PSSR inspection requirements (for an agreed fee).
  • white tick icon No-obligation quote for all identified inspection requirements.
  • white tick icon Test-house facility available if required.
  • white tick icon Inspection Service contract and schedule.
  • white tick icon PSSR Inspections by friendly, qualified pressure vessel inspectors, by appointment.
  • white tick icon Free impartial advice by phone.
  • white tick icon Immediate feedback should any serious defects be identified.
  • white tick icon Summary and review of any queries arising from the inspection, at the end of the visit.
  • white tick icon Written reports by email or via our online reporting system.
  • white tick icon On-site or test house facilities to validate repaired vessels.

What Does Pressure Systems Equipment Include?

There is a legal requirement for thorough examination of pressure vessels and receivers that contain steam, compressed air, and refrigerants. Any pressure vessel containing relevant fluid over 250 bar/litres capacity requires inspection.

Examples of pressure systems and equipment are:

  • white tick icon Boilers and steam heating systems
  • white tick icon Pressurised process plant and piping
  • white tick icon Compressed air systems (fixed and portable)
  • white tick icon Pressure cookers, autoclaves, and retorts
  • white tick icon Heat exchangers and refrigeration plant
  • white tick icon Valves, steam traps, and filters
  • white tick icon Pipework and hoses
  • white tick icon Pressure gauges and level indicators
  • white tick icon Air conditioning plant

You can find a full list of items requiring PSSR thorough examination/inspection on our Equipment Safety Checklist page.


Man wearing black overalls and white protective gloves operating pressure system equipment.
A large red industrial pressure vessel, indoors with multiple pipes connected to the machine.

When Are Pressure Vessel Inspections Required?

To establish whether you need a pressure vessel inspection, multiply the vessel operating pressure (in bar units) by the vessel capacity (in Litres) i.e. 10 bar x 50 Litres = 500 bar/litre capacity and therefore is above the 250 bar/litre threshold and requires an inspection with a written scheme of examination.

Owners and users of refrigeration plant containing pressure vessels, with compressor power over 25 kilowatts, also require a written scheme of examination and inspection.

Click to find out more about PSSR Regulations