Most Asked 10 Questions About Freight Elevator Capacity - News

2. What is relationship between freight elevator size and capacity?

It's size directly affects capacity and load:

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● Cabin area: Approximately 500~800 kg per square meter.
● Cabin height: Influences how cargo can be stacked.
● Door opening size: Determines the ease of loading and unloading cargo.
● Calculation formula: Load capacity (kg) = Cabin area (㎡) × Load per unit area (kg/㎡).

Example: For a 2m × 2m cabin, at 600 kg/㎡, the load capacity is approximately kg.

6. How is the safety margin for freight elevator capacity calculated?

This is based on 3 safety design principles:

● Mechanical safety factor: All load-bearing components (wire ropes, guide rails, etc.) are designed for 125% of nominal values.

● Dynamic load compensation: Additional loads occur during elevator acceleration/deceleration.

● Long-term wear allowance: Metal fatigue after 5 years reduces load capacity by approximately 15%.

Example: A freight elevator with a kg nominal capacity is designed to handle kg but must be strictly operated within 5 tons.

7. Is capacity of double-cabin freight elevator double that of single cabin?

A common misconception.

In actual operation, consider:

● Balance system limitations: Two cars share the same counterweight, with total load capacity typically 1.6 times that of a single car.

● Synchronization requirements: Weight difference between cars must be <15% to avoid system alarms.

● Efficiency loss: Actual transport volume is about 75~85% of theoretical capacity.

Example: Two cars with a nominal kg capacity have an actual total operating load of about kg and require an intelligent balance control system.

9. Can existing freight elevator capacity be increased through modifications?

Modification feasibility depends on:

● Whether the hoistway structure strength allows it.

● Whether the original drive system can be upgraded.

● The load margin of safety components (wire ropes, buffers).

General recommendations:

● Equipment under 10 years old may be considered for modification, costing about 60% of a new elevator.

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● Older equipment is recommended for replacement, as modifications may not meet the latest safety standards.

10. Can the actual load of a freight elevator exceed its nominal value?

Absolutely prohibited!

However, understand these 3 key values:

● Rated load: The safety value marked on the nameplate (e.g., kg).

● Test load: 125% during factory testing (kg).

● Ultimate load: Safety gear activation threshold at about 140% (kg).

Temporary overloading by 10% may not cause immediate failure but can lead to:

● Wire rope elongation and deformation, guide rail uneven wear, and electrical system overheating.

1. What standards do you test to?
   

   Different testing standards apply to different types of lift equipment. To ensure the safety of your personnel and your organization’s compliance, make sure that potential providers have an in-depth understanding of all applicable regulations and standards affecting your lift equipment.

   The Lift Services team at IIA tests to all applicable OSHA, ANSI, ASTM and NFPA standards; and CSA standards in Canada. Our skilled technicians have a complete understanding of the testing requirements affecting your lift equipment.

2. Are your technicians certified?
   

   It is critical that inspections be performed by trained and certified personnel, as defined in applicable standards. Ask potential providers about their technicians’ qualifications and experience to ensure testing will meet all standards.

   IIA maintains a robust training program to meet or exceed standards and requirements for personnel qualifications outlined in ANSI, NFPA and other applicable governing bodies. Our team includes experienced and highly skilled technicians with certifications ranging from NDT Level 1 to Emergency Vehicle Technician F5. All of our personnel are committed to quality and customer service.

   In Canada, our technicians are certified to CAN/CGSB-48. to perform non-destructive testing on lifting equipment. Additionally, we have in-house engineers who certify the equipment as per national requirements.

3. What is included in the price?
   To avoid surprises on your invoice, ask the provider to outline all job duties they will perform (including non-testing activities) and the costs associated with each type of testing. When you request a quote from IIA, you will receive a complete breakdown of all services included in the quoted price, so you know exactly what you are paying for. Leading providers like IIA will leave your fleet looking as good or better after testing as it did at the beginning.
4. Can we choose what month our tests are done?
   

   If you have a preferred month in which you’d like to have your testing done, ask potential providers if they can accommodate that request.

   While some geographical and seasonal limitations apply, IIA tries to accommodate customer scheduling requests whenever possible — including offering 24/7 services for some types of testing.

5. What days of the week do you perform testing?
   Most of our lift equipment testing is available 24/7 year-round. However, IIA typically performs fire equipment testing Monday through Friday.
6. What happens if a piece of equipment is out of service at the time of testing?
   Ask the provider how they would accommodate equipment that is non-operational on the day of testing. In these situations, IIA will work with you to reschedule a convenient time to return and complete the testing.
7. Does your company specialize in one type of lift equipment?
   A full-service provider can streamline the testing experience and reduce the paperwork and costs associated with using multiple providers. IIA has expertise in all types of lift equipment, from bucket trucks and fire trucks to digger derricks, scissor lifts, mobile (boom trucks, crawler cranes, rough-terrains, etc.) and overhead cranes, GSE and more.
8. Do you keep records of prior years’ test results?
   It’s helpful to know if inspection providers maintain historical records of your inspections in case your internal records ever get lost, misplaced or damaged. IIA maintains up to 7 years of prior testing records for our clients.
9. What kind of report can I expect?
   

   Thorough and complete testing documentation is essential to maintain safety and compliance. Ask potential providers about the level of detail provided in their final reports and ask to see samples.

   IIA provides comprehensive, easy-to-read reports that will help you prioritize and plan maintenance and repairs. Our detailed records also help clients navigate regulatory audits with confidence.

    

   In Canada, lift equipment often requires an engineering certificate to go with the inspection report, as per CSA standards. Our engineers can certify equipment for use in most provinces and territories.

10. Does your company offer any additional lift-related services?
    

    It’s helpful to know the extent of a provider’s capabilities should you have a lift-related need that goes beyond routine inspections.

    At IIA, our team includes engineers who can assist with lift equipment repair, custom lift equipment design and lift planning for complex or heavy loads. Beyond lift services, IIA is also a leader in providing laboratory testing, industrial inspections, and mechanical, structural and welding engineering solutions across North America and beyond.

    For more information, please visit UN-F Series Freight Elevator.