What must sheaves be compatible with when used in rigging?

Sheaves must be compatible with the size of the rope being used in rigging because the correct interaction between the sheave and the rope is crucial for effective and safe lifting operations. If the sheave is too small for the diameter of the rope, it can cause excessive wear on both the rope and the sheave, potentially leading to failure. Conversely, if the sheave is too large, it may not securely hold the rope, leading to slippage. Proper compatibility ensures that the rigging operates smoothly, reduces the risk of accidents, and maintains the integrity of both the rope and the sheave under load.

The compatibility with the type of load being lifted, the weight of the load, and the skill level of the rigger are also important factors in rigging but are not directly related to the specific requirement for sheaves. These factors influence the overall rigging setup and safety but do not focus on the technical specifications needed for sheave and rope interaction.