If you're wondering regarding the dispute between Riggers Liability and Floater insurance, the basic premise is quite simple. Crane, boom trucks & rigging insurance program are narrower, in this case, includes the specific rigging, moving and handling activities, while Installation Floater slightly more extensive and includes activities such as part of the work covers installed, created or established by the contractor until the installation work is accepted by the buyer.
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Riggers Liability serves as liability coverage, which means rigger must be legally responsible for damage to the engine for the scope to be involved. In terms of Installation Floater, some policies only cover the installation but do not remove the machine for maintenance.
Regardless of how many contractors insurances you may have in their General Liability (GL) and Umbrella them, there will be a separate limit on them Riggers obligation or Installation Floater.
the rigger can return to their insurance company and obtain support for increased coverage.
Project-specific support may be limited to narrowly limited risk exposure which can be single-rigging activities on certain days. Either way, if support is guaranteed, expect support costs will be passed in the value of the contract.
Lastly, and most importantly, ask your insurer. They are in the business of giving you protection, and the protection that includes prevention consultation. It's part of their business model to provide that service and it should be part of your business model to use for the same.