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The requirements the employees should meet in high pressure cleaning, are laid down in the form of attainment and test targets which can be found under the menu 'attainment and test targets'. The subject matter is based on these attainment and test targets. The employees must be SIR certified by means of an examination. There are four different categories which fall under working with high pressure. Following a brief description of each category.
High Pressure Water Jetter and High Pressure Operator (HPWJ / HPO)
The high-pressure water jetter or operator is responsible for safe execution of their own HP activities, in accordance with the prescribed procedures and instructions. This employee is under the responsibility of the operationally responsible pump engineer and follows the indications and instructions given by them.
During the written part of the examination, the candidate’s theoretical knowledge will be tested. During the practical of the examination, an examinations team will assess whether the candidate can clean using high pressure in accordance with the regulations prescribed by the SIR.
High Pressure Pump Engineer (HPPE)
When carrying out HP activities, the pump engineer has operational responsibility for:
  • Direct control of the employees.
  • The correct technical and safe installation of the high-pressure system in the work area.
  • The correct demarcation of the jetting area.
  • All actions that are required to carry out the work safely.
The pump engineer is the contact for third parties.
The examination is a written examination during which both the theoretical and practical knowledge of the pump engineer are tested.
High Pressure Supervisor (HPS)
People who supervise must have sufficient knowledge and skills to ensure safe proceedings during the preparation and implementation of high pressure cleaning work. The supervisor must be aware of all risks that apply to Chemical and Technical Cleaning. Moreover, he must be able to compile, assess and clarify a S&H plan (Safety and Health Plan), Risk Inventory and Evaluation) and a TRA (Task Risk Analysis). This knowledge will therefore be tested as well during the written examination.
High Pressure Inspector (HPI)
An HP inspector  has demonstrably sufficient knowledge of high-pressure systems and HP components based on their professional knowledge, training and experience in this field. The HP inspector is familiar with the technical and implementation rules of the SIR, so that they can assess the safety of a high-pressure system and/or HP components. This knowledge will be tested during the written examination and in a later phase during an on the job assesment.