13.6 INFORMATION WHICH SHOULD BE EXCHANGED BETWEEN THE USER AND THE DESIGNER OR SUPPLIER
Jacks are readily available in a wide range of designs, sizes and capacities, some including special features making them suitable for certain applications. The exchange of information should therefore be as detailed as possible. As by their nature jacks are often moved from site to site and used to handle a wide variety of loads, precise details are not always available and in these cases only a general specification can be given. In many cases, the requirements will be basic and the information easily exchanged. In all other cases the following minimum information should be exchanged:
Capacity. Where possible, full details of the load to be lifted, including dimensions, weight and details of jacking points.
Type of jack, i.e. hydraulic, ratchet, screw or journal.
Details of working dimensions, e.g. closed height, extended height, size of head of jack, height and size of toe, etc.
Details of the intended use, including utilization and required accuracy of load placement. Where the jack is required for general purpose use, it may be necessary to impose limits on the use. The manufacturer’s instructions should therefore be sought and their recommendations followed.
Environmental conditions, e.g. outdoor or indoor use, use in corrosive atmospheres, use in hazardous areas, use with dangerous loads, etc.
Details of finish, including any special paint or protective finish.
Any special features or optional fittings such as claw attachment, gauges, etc.
Any other technical requirements.
Operational and maintenance instructions, including limitations of use.