Warning & Technical

Inspection Criteria for Twintex® Roundslings

1. Initial Inspection
   
   Before any new or repaired roundsling is placed in service, it shall be inspected by a designated person to ensure that the correct roundsling is being used, as well as to determine that the roundsling meets applicable specifications and has not been damaged in shipment.
   
   
2. Frequent Inspection

This inspection shall be made by the user handling the roundsling each time it is used.

• Periodic Inspection

This inspection shall be conducted by designated personnel. Frequency of inspection should be based on:

• Frequency of roundsling use
• Severity of service conditions.
• Experience gained on the service life of roundslings used in similar applications.
• Periodic inspections should be conducted at least annually.

Remove from service when:

• Cuts to sling cover expose red-striped white core yarns
• Holes, tears, snags or abrasions expose red-striped white core yarns
• End fittings are pitted or corroded, cracked, distorted or broken
• The sling shows signs of melting, charring, or chemical damage
• Capacity tag is illegible or missing
• Knots in any part of the roundsling
• Broken or worn stitching in the cover which exposes the core fibers
• Other visible damage which causes doubt as to the strength of the sling
  Note: Do not expose roundslings to temperatures exceeding 194°F

Do not exceed rated capacities. Ratings must be reduced when slings are used at angles of less than 90° from horizontal.
**The use of ANY roundsling with a nylon cover and polyester load-bearing core yarn makes the detection of chemical damage to the core yarn extremely difficult. Use of such roundslings in chemically active environments, ESPECIALLY THOSE WHICH INCLUDE STRONG ALKALIS, is not recommended. Alkalis can damage the polyester core yarn without damaging the nylon cover, making inspection for this type of damage almost impossible. In such chemically active environments, roundslings using covers made from the same fiber as the core yarn is recommended, because the environment will damage the cover either before or at the same time as the core yarn, making inspection and detection much more reliable. If in doubt, return the roundsling to SpanSet for inspection and proof testing.

WARNING
The capacity of a sling to lift weight DECREASES as the angle of the sling moves away from being vertical. If the angle of the sling is not taken into consideration before selecting a sling to lift a load, SERIOUS INJURY OR DEATH COULD RESULT from the load being dropped.
 
Sling Angle Capacities
If you know the lifting angle of the sling being used, you can apply the
Capacity Reduction Factor or the Load Multiplier in the Sling Angle Chart.
If you don't know the angle:

• Attach the sling(s)
• Apply lift until the slings are taut and the load is ALMOST ready to
  leave the ground
  (BUT DO NOT LIFT THE LOAD OFF THE GROUND!!)
• Measure the length of the sling between the lift point and the load
• Measure the height between the lift point and the load (See Fig. 1)

*Do not exceed rated capacities. Ratings must be reduced when slings
are used at angles of less than 90° from horizontal.

Situation 1: Capacity Reduction Factor
When you know the appropriate rated capacity of the sling, and you need to calculate its actual capacity (based on the sling angle), follow the instructions below:

(The Example uses a measured length of 12 feet and a measured height of 8 feet.)
Measured Length (L): 12 feet
Measured Height (H): 8 feet
Reduction Factor (RF) = H ÷ L = 8 ÷ 12 = 0.667
Rated Capacity* of sling = 1,000 lbs.
Actual Capacity of sling = Rated Capacity x RF = 1,000 X 0.667 = 667 lbs.

Situation 2: Load Multiplier
When you know the actual weight of the load, and you need to calculate the appropriate
rated capacity (based on the sling angle) of the sling to lift the load, follow the instructions below:

(The Example uses a measured length of 12 feet and a measured height of 8 feet.)
Measured Length (L): 12 feet
Measured Height (H): 8 feet
Load Multiplier (LM) = L ÷ H = 12 ÷ 8 = 1.5 Load weight: 1,000 lbs.
Necessary Rated Capacity*
of sling = Load Weight x LM = 1,000 X 1.5 = 1,500 lbs.