The International Marine Contractors Association (IMCA) has published revisions of two important diving publications, Diving Equipment Systems Inspection Guidance Note (DESIGN) for Mobile/Portable Surface Supplied Systems (IMCA D 040 Rev 1) and Mobile/Portable/Daughtercraft Surface Supplied Systems (IMCA D 015 Rev 1).
According to IMCA, Both documents can be downloaded free of charge from its website.
“Our diving guidance documents are used throughout the world, indeed often use of them is a requirement for diving contractors responding to a tender,” explains Jane Bugler, IMCA’s Technical Director and Acting Chief Executive. “The DESIGN series of documents have long played an important role within the industry.
“In the early 1980s, in order to give some guidance to the offshore industry, IMCA’s predecessor the Association of Offshore Diving Contractors (AODC) started to produce a number of reference documents, standards and guidance notes. This process continued through the 1980s. It was clear, however, that there was still considerable confusion with some diving systems being ‘audited’ several times a year by different clients, each of whose representatives had slightly different interpretations as to what was required.”
Current Version of IMCA D 040
IMCA D 040 for mobile/portable surface supplied diving equipment has now been revised and updated to incorporate equipment improvements and changed operating practices since its first publication in 2006. In particular it has been enlarged to recognise the increased use of specially designed small vessels with the diving equipment permanently installed (daughtercraft) in addition to the simple versions of this type of equipment which are commonly referred to as ‘SCUBA-replacement’. The format has also been changed slightly to improve ease of use and provide better referencing.
It is intended that IMCA D 040 should be used in conjunction with IMCA D 018 – ‘Code of practice on the initial and periodic examination, testing and certification of diving plant and equipment’. Cross-references to this Code are provided where appropriate
The newly revised document offers examples of good practice. It gives advice on aspects of a diving system that should be configured in certain ways in order to provide a safer system of working. It also identifies how inspection and testing can be carried out safely and efficiently.
“IMCA D 040 has no direct legal status but many courts, in the absence of specific local regulations, would accept that a company carrying out diving operations in line with the recommendations of this document was using safe and accepted practices,” says Jane Bugler.
IMCA D 015 Rev 1
A mobile/portable/daughtercraft surface supplied system, can, in certain circumstances, be used in place of a complete conventional surface supplied diving system where access for a full system is restricted or not possible.
Mobile/portable/daughtercraft systems vary considerably in their capabilities. At the simplest they comprise three cylinders of breathing air mounted in a frame with a small control panel and umbilicals which can be placed in an inflatable boat, typically to carry out a single dive, or may be used on a large barge or platform to allow diving from a location remote from the main diving area. This type of system is commonly referred to as SCUBA replacement and has the advantage of being readily portable, thus offering greater flexibility during the diving operation, but is limited in the supply of breathing air available.
At the other extreme they can be quite large, custom designed, daughtercraft with the ability to have two divers working in the water at the same time and to carry out several dives before needing to return to the mothercraft for replenishment.
When this technique is being used with diving from a small vessel (inflatable or larger daughtercraft) then there will always be a support vessel (known as the mothercraft) in the vicinity carrying all necessary extra diving support equipment and fitted with a suitable handling system for the safe launch and recovery of the small vessel. In some circumstances the support vessel may be replaced by a fixed installation carrying all the necessary extra diving support equipment and handling system.
“This guidance sets out what is generally regarded in the industry as good safe practice when diving using such equipment,” explains Jane Bugler. “The guidance is not mandatory and persons may adopt a different standard in a particular situation where to do so would maintain an equivalent level of safety. It is not intended that such equipment be used as a substitute for a complete surface supplied diving system, particularly if the full system can be safely accommodated at the diving location.”