BGV D8+ is positioned between the BGV D8 and BGV C1 standards. With respect to load runs, its stipulations are the same as those of BGV D8, except that no work limit switch is required. For BGV D8+ chain hoists with rated load-bearing capacities of 1,000kg upwards, an overload shutdown function is required, whilst for BGV D8, a friction clutch can be used for overload monitoring. For BGV C1 chain hoists, the provision of an overload shutdown function and work limit switches is compulsory.
In other respects, D8+ is in many respects similar to C1 and requires double dimensioning of the driving gear with respect to the rated load capacity, dual brakes and lifting gear with a safety factor of >10 with respect to breaking strain at the rated maximum load, whilst the stipulations regarding an emergency limit switch and underload (slack chain) monitoring are the same as those of D8. ChainMaster has announced that it will be possible to upgrade existing ChainMaster chain hoists to bring them into conformity with the BGV D8+ standard.
(Lee Baldock)
