12.6 INFORMATION WHICH SHOULD BE EXCHANGED BETWEEN THE USER AND THE DESIGNER OR SUPPLIER
Mobile supporting structures are readily available in a wide range of designs, sizes and duty classifications, and may of course be purpose built to suit a particular application or include various special features. The exchange of information should be as detailed as possible. As by their nature mobile supporting structures are often moved from site to site and used to handle a wide variety of loads, precise details are not always available. In these cases, only a general specification can be given. In many cases, the requirements will be basic and the information easily exchanged. Where special site conditions apply or where special circumstances exist, a visit by the supplier to survey the site should be considered as this will minimize the necessary exchange of information. In all cases, the following minimum information should be exchanged.
SWL. Where possible, full details of the load to be lifted, including dimensions and weight.
Type of mobile supporting structure, (e.g. goalpost, adjustable, self-erecting), including maximum wheel and/or jack loadings.
Duty type, i.e. heavy duty or light duty.
Details of working dimensions, e.g. height, span, effective length, etc, including any necessary clearances. This information should also include the details of any obstructions which may affect the design of the structure. Outline drawings may be used for this purpose.
Details of bracing, e.g. internal.
Type of lifting appliance to be used, including its connecting device.
If electric power feed equipment is to be supplied, the type required, which must include provision of earth leads. This should be accompanied by details of the power supply available, including voltage, phase(s), frequency and details of the method of connection to the power source.
If pneumatic power feed equipment is to be supplied, the type required. This should be accompanied with details of the air supply available, including pressure, rate of delivery and method of connection to the air supply.
Type of castors, including details of the floor conditions and any other factors affecting the choice of type.
If jacks are required, the type and details of permissible loading duties.
If wheel brakes and /or rotational locks are required, the type.
Environmental conditions, e.g. indoor or outdoor use, use with corrosive atmosphere, use in hazardous areas, use with dangerous loads.
Details of finish, including any special paint or protective finish required taking account of standards or legislative requirements with regard to the use of distinctive colours.
Weight of the structure.
Any special features or technical requirements, including if the mobile supporting structure is to be moved under load.
Full erection, operational and maintenance instructions.