If the operations you have mentioned have doubled the service life of the chain hoist, that's excellent news! It indicates that you have likely implemented some effective maintenance and usage practices.

Here are some possible reasons why the service life of your chain hoist has doubled:

1. Regular Maintenance: Regular inspections, cleaning, and lubrication of the chain hoist's components can greatly extend its service life.

2. Proper Usage: Using the chain hoist within its specified capacity and load limits, as well as following proper lifting and lowering procedures, can reduce wear and tear on the equipment.

3. Timely Repairs: Addressing issues with the chain hoist, such as replacing worn parts or fixing broken components, in a timely manner can prevent further damage and extend the equipment's service life.

4. Storage and Handling: Proper storage of the chain hoist in a dry, clean environment, as well as careful handling during transportation and installation, can minimize damage and ensure optimal performance.

5. Operator Training: Well-trained operators who understand the safe and efficient use of the chain hoist can minimize accidents and maximize its service life.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment