Four straps, 14,000 lb of pipe, and a cut webbing
You are securing 30-foot lengths of 8-inch steel pipe on a 48-foot flatbed. The pipe is stacked in one pile, banded, weighing 14,000 lb total. You have four 2-inch ratchet straps on the truck; each strap's label shows a working load limit of 1,625 lb. All four are in good condition and you have edge protectors for the corners, plus two more of the same straps in the toolbox. You are about to leave a shipper in Grand Island for a 190-mile run to Omaha on I-80, mostly at 65 mph. The shipper's loader says the last driver used four straps and 'never had a problem.' Sixty miles down the road you stop for fuel, walk the load, and find one strap with a cut through the outer webbing that exposes the white core fibers, and the top bundle has shifted about 4 inches to the left.
1. Calculate the minimum number of tie-downs required for this load and decide whether the four straps on the truck are legal. Show each rule you applied.
Read the worked answer
Two separate rules must both be satisfied: a count rule and a strength rule.
Count. For an article 10 feet or longer, you need two tie-downs plus one for each additional 10 feet or fraction of 10 feet. 30 feet gives 2 + 3 = 5 tie-downs minimum. Four is short on count alone.
Strength. The aggregate working load limit of the tiedown assembly must be at least 50% of the cargo weight. 50% of 14,000 lb = 7,000 lb. Four straps at 1,625 lb gives 4 x 1,625 = 6,500 lb - 500 lb short.
So the load as secured fails both tests. Using five straps gives 5 x 1,625 = 8,125 lb, which satisfies the strength rule, and meets the count rule of five. But every component in the system must be rated - the WLL of the assembly is the lowest-rated part, so check the ratchet and the hooks, not just the webbing label, and make sure the edge protectors are against the steel at every contact point.
The loader's 'last driver did it' is not a rule and never was.
2. At the fuel stop, with the cut strap and the bundle shifted 4 inches, what do you do and where do you do it?
Read the worked answer
The load is not roadworthy and the strap is out of service. A cut through the outer weave exposing core fibers is a damaged strap - it has lost capacity you cannot see, and it must be removed from service, not shortened, knotted, or used on a light load. Take it off the truck entirely so it does not get reused.
Sequence:
- Pull fully off the travel lane, park on level ground, parking brake set, wheels chocked, four-ways on. Do not re-secure anything standing in a fuel lane or on the shoulder.
- Replace the cut strap with one of the two spares, so you are back to a full set - and use all five, since four already failed the count and the strength rule.
- Re-square the shifted bundle. A 4-inch shift is evidence that the aggregate restraint was inadequate, not that the load settled. Before you tighten, check the banding, check the pipe ends for damage, and check the stake pockets and the deck for anything that has moved.
- Re-check the whole system, not just the failed strap - if one strap was cut, the others were loaded harder.
- Note the damage and the re-securement on your vehicle condition report and tell dispatch.
3. How often must this load be checked, and what specifically are you looking for on a pipe load at 65 mph?
Read the worked answer
The cargo must be inspected within the first 50 miles of the trip, and then at intervals of every 150 miles or 3 hours, whichever comes first. On a 190-mile run that means roughly the 50-mile mark, then at about 150 miles, plus any stop you make anyway - the fuel stop at 60 miles already counts as one of those checks. If you change drivers, the new driver checks before moving.
What you are looking for on a banded pipe load:
- Webbing - cuts, abrasion, UV damage, or a strap that has been rubbing on a sharp edge. The cut you found is exactly this failure mode.
- Tension - a strap that has gone slack means the load moved, and a load that moved once will move again.
- The bundle itself - shifted pipe, cracked or stretched banding, pipe ends that have crept forward toward the headboard or rearward toward the tailgate.
- Edge protectors - still in place at every contact point, not chewed through.
- The deck and tie-down points - bent or cracked stake pockets, rub rails, or D-rings, which reduce the rating of the whole system.
Any single one of those found at a check means you stop and fix it before continuing.