Pulling forces together (Load Testing)

In summary, the conversation discusses load testing a lifting lug that is welded to the ceiling with a 5 tonne pull using a chain block and web sling. The question is whether the lug and floor are being pulled by 5 tonnes each or 2.5 tonnes each. It is determined that both lugs are certified to lift 5 tonnes and the test load is always higher than the certified load to provide a safety factor. The accuracy of load indicators for chain winches may not be accurate enough for certification. Tensioning the chain block to 5 tonnes on the load test indicator effectively tests both lugs to 5 tonnes.
  • #1
steviewinter
4
0
Hello,

Here's my question:

When load testing a lifting lug that is welded to the ceiling, placing it under 5 tonnes of pull, using a chain block to tension and a web sling that is attached to the floor directly below, are you:
A) Pulling 5 tonne down from the lug and 5 tonne up from the floor
B) 2.5 tonne down from the lug and 2.5 tone up from the floor
C) Anything else?

Diagram

_____________________CEILING
Lug ----> ρ
|
|
|
* 5 tonne pull *
|
|
|
__________ρ__________ FLOOR
 
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  • #2
steviewinter said:
Hello,

Here's my question:

When load testing a lifting lug that is welded to the ceiling, placing it under 5 tonnes of pull, using a chain block to tension and a web sling that is attached to the floor directly below, are you:
A) Pulling 5 tonne down from the lug and 5 tonne up from the floor
B) 2.5 tonne down from the lug and 2.5 tone up from the floor
C) Anything else?

Diagram

_____________________CEILING
Lug ----> ρ
|
|
|
* 5 tonne pull *
|
|
|
__________ρ__________ FLOOR
It depends on what moves. If nothing moves, all tensions are balanced so everything is being pulled in the opposite directions by equal forces. So the ceiling is pulling the floor up and the floor is pulling the ceiling down, each using 5,000 x 9.8 Newtons of force, and the building structure is pulling down on the floor and up on the ceiling to balance the tension between the floor and ceiling with the same force.

AM
 
  • #3
Nothing moves, the tension is balanced with a chain block pulling 5tonne in the middle. So could you say that both lugs are certified to lift 5 tonne?
 
  • #4
The certified load is always less than the test load.

That is you can work at the certified load indefinitely (until the next test) but the actual test is conducted at a higher load. This builds a safety factor into the certification process.

The accuracy of load indicators for chain winches are less than the accuracy achievable by hanging weights from your lug and may not be accurate enough to allow certification.
 
  • #5
I see, so could you tell me, if i tensioned the chain block to 5 tonne on the load test indicator did i, in effect;

Test both lugs to 5 tonnes
or ,
Test them each to 2.5 tonne?
 
  • #6
If the test held at 5 tonnes then both floor and ceiling connections were tested to 5 tonnes.
 
  • #7
Thank you very much!
 

1. What is load testing?

Load testing is a type of performance testing that involves simulating a high volume of users or requests to a system or application in order to measure its ability to handle the expected load. This is important for identifying and resolving any performance issues before the system is deployed.

2. Why is load testing important?

Load testing is important because it allows for the identification of potential performance bottlenecks and helps ensure that the system can handle the expected load. This can prevent issues such as crashes, slow response times, and other performance problems that can greatly impact user experience and the success of the system.

3. What are the different types of load testing?

The different types of load testing include load testing, stress testing, endurance testing, and spike testing. Load testing involves simulating a high volume of users or requests to the system. Stress testing pushes the system to its limits by increasing the load beyond its expected capacity. Endurance testing involves testing the system under a sustained load for a prolonged period of time. Spike testing simulates sudden spikes in user activity to see how the system handles unexpected increases in load.

4. How is load testing performed?

Load testing is typically performed by using specialized software or tools that simulate user activity and generate the expected load on the system. This can involve creating test scripts, setting up test scenarios, and running the tests multiple times to collect data and identify any performance issues. The results of the load testing can then be analyzed to make any necessary improvements or optimizations to the system.

5. How can load testing be automated?

Load testing can be automated by using specialized tools and scripts that can simulate user activity and generate the expected load on the system. This can help save time and resources by allowing for the tests to be run automatically at regular intervals, rather than manually setting up and running the tests each time. Automation also allows for more accurate and consistent results, as human error can be minimized.

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