Posted By grim72 There is some info regarding competency in this link: http://www.hse.gov.uk/pubns/indg178.pdf I'm not sure how much help it will be. I will also forward you some information on a possible system for your inspectors to use.

Posted By MICHAEL T Got to it finally after ploughing through the ACoP. Thanks for advise on Insurance involvement. 105 The three categories are as follows: (a) Minor systems include those containing steam, pressurised hot water, compressed air, inert gases or fluorocarbon refrigerants which are small and present few engineering problems. The pressure (above atmospheric pressure) should be less than 20 bar (2.0 MPa) (except for systems with a direct-fired heat source when it should be less than 2 bar (200 kPa)).The pressure-volume product for the largest vessel should be less than 2 x 105 bar litres (20 MPa m3).The temperatures in the system should be between -20°C and 250°C except in the case of smaller refrigeration systems operating at lower temperatures which will also fall into this category. Pipelines are not included. (a) Minor systems Staff At least one member of staff qualified to incorporated engineer level with adequate relevant experience and knowledge of the law, codes of practice, examination and inspection techniques and understanding of the effects of operation for the system concerned. Specialist services Established access to basic design and plant operation advice, materials engineering and non-destructive testing (NDT) facilities. Organisation Sufficient organisation to ensure a reasonable document storage and retrieval system with ready access to relevant law, technical standards and codes. (b) Intermediate systems include the majority of storage systems and process systems which do not fall into either of the other two categories. Pipelines are included unless they fall into the major system category. (b) Intermediate systems Staff Depending on the complexity of the system, at least one senior member of staff of chartered engineer or equivalent status in each relevant discipline and supported by technically qualified and experienced staff with knowledge of the law, codes of practice, examination and inspection techniques and understanding of the effects of operation for the system concerned. Specialist services In-house or clearly established access to materials engineering, NDT, design and plant operating advice. Organisation Clear supervisory arrangements with an adequate degree of formal organisation. Appropriate document storage and retrieval system with ready access to relevant law, technical codes and standards. (c) Major systems are those which because of their size, complexity or hazardous contents require the highest level of expertise in determining their condition. They include steam-generating systems where the individual capacities of the steam-generators are more than 10 MW, any pressure storage system where the pressure volume product for the largest pressure vessel is more than 106 bar litres (100 MPa m3) and any manufacturing or chemical reaction system where the pressure-volume product for the largest pressure vessel is more than 105 bar litres (10 MPa m3). Pipelines are included if the pressure-volume product is greater than 105 bar litres. (c) Major systems Staff Depending on the complexity of the system, at least one senior member of staff of chartered engineer or equivalent status in each relevant discipline and supported by technically qualified and experienced staff with knowledge of the law, codes of practice, examination and inspection techniques and understanding of the effects of operation for the system concerned. Specialist services In-house or clearly established access to the full range of relevant specialist services in the fields of materials engineering, NDT, design and plant operation. Organisation Formal structure and clear lines of authority and responsibility set out in a written statement. Formal recruitment and training policies for staff. Effective document storage and retrieval system with ready access to relevant law, technical codes and standards. Regards Mike