When something weighs 40,000 pounds and needs to move six inches, the rigger becomes one of the most important people on the job.
Refinery riggers handle loads that other crafts need moved safely into position: pipe spools, valves, exchanger heads, bundles, pumps, motors, compressors, structural steel, vessel components and countless pieces of turnaround equipment.
But rigging isn’t simply attaching a sling and signaling the crane operator.
A rigger needs to understand weight, center of gravity, sling angles, capacity, hitch configuration, load control, communication and what will happen when the load leaves its supports.
The tools help.
The knowledge keeps the lift controlled.
Here are 10 tools every refinery rigger should carry or have readily available.
1. Tape Measure
Rigging starts with dimensions.
A tape measure helps determine load dimensions, attachment-point spacing, available clearance and other information needed when planning a lift.
Suppose a large valve needs to pass between two structural columns.
The crane may have plenty of capacity.
The rigging may be properly selected.
But if the valve physically doesn’t fit through the available opening, the lift plan has a different problem.
Measure before the load is hanging.
Field Rule
Don’t discover your clearance problem while the load is suspended.
2. Rigging Calculator or Reference
A rigger needs access to reliable information for sling-angle calculations, capacities and other lift-related requirements.
This may be an approved rigging reference, calculator or digital tool permitted by the employer.
The important word is approved.
Critical lift decisions shouldn’t depend on memory when verified information is available.
Rigging calculations may involve load weight, sling configuration, sling angle, number of load-bearing legs and manufacturer-rated capacities.
The calculation is only useful if the information entered is correct.
Field Rule
A calculator can solve the equation. It cannot tell you that you entered the wrong load weight.
3. Inspection Flashlight
Rigging equipment needs inspection.
A flashlight helps inspect areas that aren’t easily visible, including sling surfaces, shackles, hooks, attachment points and portions of equipment hidden by shadows.
Refineries are full of poor viewing angles.
A sling passing behind a pipe or underneath equipment may look fine from one position and reveal a problem from another.
Good riggers look.
They don’t assume.
Field Rule
If you can’t inspect it properly, reposition yourself until you can.
4. Paint Marker
During complicated rigging work, clear markings can prevent confusion.
A paint marker can identify reference points, orientation marks, pick points or other approved field information.
For example, a crew preparing to remove a spool may establish orientation references before the spool leaves its installed position.
That makes reinstallation or relocation easier.
Markings should be clear and should never obscure equipment identification or required inspection markings.
Field Rule
A useful mark should eliminate confusion—not create another interpretation.
5. Adjustable Wrench
Riggers frequently encounter miscellaneous hardware around equipment, temporary attachments and supporting components.
An adjustable wrench provides a versatile option for general mechanical tasks.
However, it is not a universal rigging tool.
Rigging hardware should be assembled and used according to manufacturer requirements and the applicable site procedures.
Never modify or improvise rigging hardware simply because you have a wrench that fits it.
Field Rule
If the rigging hardware wasn’t designed to work that way, your wrench doesn’t redesign it.
6. Combination Wrench
A properly sized combination wrench provides better engagement than an adjustable wrench when working with appropriate fasteners.
Riggers often work alongside pipefitters, boilermakers and millwrights while equipment is disconnected or prepared for movement.
Having basic mechanical tools can prevent unnecessary delays.
But riggers need to recognize the boundary between preparing equipment for movement and altering the lifting equipment itself.
Rated lifting devices should not be casually modified.
Field Rule
Know whether you’re working on the load or the equipment responsible for holding the load.
7. Bull Pin
Heavy industrial components rarely align themselves perfectly.
A bull pin can assist with alignment when positioning structural connections, equipment components and other heavy assemblies.
The tapered pin allows controlled movement between holes.
But this creates a serious hazard.
A load that is being aligned may contain stored energy.
If the pin suddenly releases, the load can move.
Hands should never be positioned where that movement could trap them.
Field Rule
Never put your fingers where you’re currently using a steel pin because you don’t trust the alignment.
8. Torpedo Level
Some loads need to arrive in a specific orientation.
A compact level helps establish level or plumb references when positioning equipment and structural components.
For example, equipment may need to be held temporarily while millwrights, boilermakers or pipefitters verify final position.
The rigger controls the load.
The receiving craft verifies where it belongs.
Good rigging is often a coordinated operation between multiple trades.
Field Rule
The load isn’t finished moving simply because it reached the general area.
9. Radio
On refinery lifts, communication can be as important as the rigging itself.
A radio may be required when the crane operator and signal person cannot maintain direct visual communication or when the lift plan calls for radio communication.
Instructions need to be clear.
Short.
Unambiguous.
Everyone involved should understand who is directing the movement.
Multiple people shouting different instructions is not communication.
It is confusion.
Emergency stop communication, however, should always be treated according to site and applicable lift procedures.
Field Rule
One lift needs one clearly understood communication system.
10. Tag Line
A tag line can help control rotation or orientation of a suspended load when its use is appropriate for the lift.
It allows workers to influence load movement while maintaining distance.
But tag lines introduce hazards of their own.
They can snag.
They can become wrapped around objects.
They can pull workers toward the load.
Workers should never wrap a tag line around their hand, arm or body.
And a tag line should never become an excuse to stand where the suspended load can strike you.
Field Rule
Control the load from a safe position. Never attach yourself to it.
The First Question: What Does It Weigh?
Before choosing slings, shackles or other rigging, the rigger needs reliable information about the load.
What does it weigh?
The answer may come from approved drawings, equipment documentation, manufacturer information, engineered lift documentation or another reliable source accepted by the site.
Guessing from appearance is dangerous.
Two pieces of equipment with similar outside dimensions can have dramatically different weights.
A valve body can be much heavier than expected.
A vessel component can contain internals.
A pipe spool can contain residual material.
An exchanger component can weigh several tons.
Rigging selection begins with knowing the load.
Center of Gravity Controls the Lift
Weight tells you how much you’re lifting.
Center of gravity helps determine how that weight behaves.
A suspended load naturally seeks a position where its center of gravity is below the hook or effective suspension point.
If the lifting arrangement doesn’t account for that, the load can tilt or rotate as it leaves its supports.
That movement may happen immediately.
A load sitting peacefully on the ground can behave completely differently once gravity is acting through the rigging system.
Experienced riggers think about that movement before the load leaves the ground.
Field Rule
The first few inches of a lift can tell you whether your assumptions were correct.
Sling Angle Changes Everything
One of the most important principles in rigging is that sling tension changes with sling angle.
Consider a symmetrical two-leg sling arrangement supporting a 10,000-pound load.
If the load is shared equally, each side supports 5,000 pounds vertically.
But that doesn’t automatically mean each sling only carries 5,000 pounds of tension.
If the sling angle is measured from horizontal, a simplified relationship is:
Tension per leg = Load ÷ (2 × sin θ)
where θ is the sling angle from horizontal.
At 90°:
10,000 ÷ (2 × 1.000) = 5,000 lb per leg
At 60°:
10,000 ÷ (2 × 0.866) ≈ 5,774 lb per leg
At 45°:
10,000 ÷ (2 × 0.707) ≈ 7,072 lb per leg
At 30°:
10,000 ÷ (2 × 0.500) = 10,000 lb per leg
The load didn’t get heavier.
The sling tension increased because the geometry changed.
This simplified example assumes ideal, symmetrical loading and should not replace approved lift calculations, manufacturer data or site requirements.
Field Rule
As the sling becomes flatter, the tension can increase dramatically.
Hitch Configuration Matters
The same sling can have different effective capacities depending on how it is used.
Common configurations include:
Vertical hitch — the sling connects directly between the load and lifting point.
Choker hitch — the sling passes around the load and through itself or an appropriate fitting.
Basket hitch — the sling supports the load from underneath with both ends connected above.
Capacity isn’t determined by the sling alone.
Configuration matters.
So do sling angle, connection geometry, edge conditions and manufacturer requirements.
Never look at a sling tag, see one capacity number and assume that number applies to every possible arrangement.
Inspect the Rigging Before the Lift
Before rigging equipment goes into service, it needs to be inspected according to applicable requirements.
Different equipment has different rejection criteria.
Wire rope slings.
Synthetic slings.
Chain slings.
Shackles.
Hooks.
Below-the-hook devices.
Each has characteristics that need attention.
For synthetic slings, damage may include cuts, burns, chemical attack or damaged identification.
Wire rope may show broken wires, kinking, crushing or other deterioration.
Hardware can show deformation, cracks, excessive wear or damaged components.
The exact acceptance and removal criteria should come from applicable standards, manufacturer requirements and the employer’s rigging program.
Field Rule
If you aren’t qualified to determine whether damaged rigging remains acceptable, don’t guess.
Read the Tag
Rated rigging equipment normally carries identification providing important information about the equipment and its capacity.
That information matters.
If required identification is missing or illegible, follow the applicable site procedure rather than guessing what the equipment used to be rated for.
A sling that “looks like the same one we always use” isn’t documentation.
Good riggers read the identification before they depend on the equipment.
Shackles Are Simple—Until They’re Used Wrong
Shackles are among the most common pieces of rigging hardware in industrial work.
They connect slings, lifting points and other rigging components.
But even simple hardware has limitations.
The correct type and capacity need to be selected.
The pin needs to be properly installed.
Loading direction matters.
Side loading can affect capacity depending on the shackle and application.
Multiple sling eyes crowded onto a shackle may create undesirable loading conditions.
Use the manufacturer’s instructions and approved rigging practices for the specific hardware.
Field Rule
A shackle isn’t just a piece of steel with a pin. It’s rated lifting equipment.
The Test Lift
One of the smartest moments in many lifts occurs before the load gets very far off its support.
A controlled initial lift can allow the crew to evaluate how the load behaves.
Is it balanced?
Is the rigging seated correctly?
Is anything still attached?
Is the load rotating?
Are the slings positioned as expected?
Is there unexpected interference?
If something looks wrong, the safest correction may be to lower the load and reevaluate.
Continuing because “we already started” is not a rigging strategy.
Stay Out of the Line of Fire
The load is only one hazard.
The rigging itself stores energy.
Slings are under tension.
Come-alongs can be loaded.
Chain falls carry weight.
Tag lines can tighten.
Components can shift.
Pins can release.
A worker standing between the load and a structure can become trapped before anyone has time to react.
Before movement begins, identify where the load could travel if something shifts unexpectedly.
Then don’t stand there.
Blind Lifts Require Better Communication
Some refinery lifts involve structures, vessels or equipment that prevent the crane operator from seeing the load.
Communication becomes critical.
The designated signal person needs to understand what the load is doing and communicate clearly with the operator according to the lift plan.
Radio communication may be used where appropriate.
The crew should establish communication before the lift begins—not while a suspended load is waiting for somebody to find the correct radio channel.
Know What Happens When the Load Comes Free
Imagine removing a large valve from a vertical piping system.
The rigging is connected.
The crane has some load.
The final bolts are being removed.
What happens when the valve separates?
Does it swing?
Rotate?
Drop slightly?
Move toward the crane?
Is the center of gravity offset?
Is residual pipe stress pushing against it?
The rigger should be thinking about those questions before separation occurs.
The dangerous moment isn’t always when the crane starts lifting.
Sometimes it’s when the equipment finally lets go.
Field Rules
- Know the load weight before selecting rigging.
- Identify the approximate center of gravity.
- Understand how sling angle affects tension.
- Verify the capacity of every rigging component.
- Inspect rigging before use according to applicable requirements.
- Read equipment identification and capacity information.
- Protect slings from damaging edges where required.
- Establish clear communication before movement begins.
- Keep personnel away from suspended loads.
- Stay out of pinch points and potential load paths.
- Never wrap a tag line around your body.
- Perform controlled initial movement when appropriate and verify load behavior.
- If the lift doesn’t behave as expected, stop and reevaluate.
Knowledge Check
1. What is one of the first things you need before selecting rigging?
A reliable load weight.
2. Why is center of gravity important?
It influences how the load will balance, tilt and rotate when suspended.
3. What happens to sling tension as a sling becomes flatter?
Generally, tension increases.
4. Does a sling have the same effective capacity in every hitch configuration?
No. Capacity can depend on hitch configuration, sling angle and other conditions.
5. Why is a controlled initial lift useful?
It allows the crew to observe load balance, rigging behavior and possible interference before committing to larger movement.
6. Should a worker wrap a tag line around their hand for additional grip?
No.
Practical Exercise
You need to lift a 20,000-pound exchanger channel head.
Before touching a sling, build the lift in your head.
Where is the center of gravity?
What approved lifting points are available?
How far apart are they?
What sling configuration is planned?
What sling angles will result?
What tension will each leg experience?
Are the slings and hardware rated for those conditions?
Are there edges that could damage the rigging?
Where will the channel head move when it separates from the exchanger?
Where are the pinch points?
Can the crane operator see the movement?
Who is giving the signals?
Where will the head be landed?
What happens if it rotates unexpectedly?
And most importantly:
Where should nobody be standing when the load comes free?
A good rigger doesn’t start thinking when the crane hook arrives.
By then, much of the thinking should already be finished.
The rigging is steel, synthetic fiber and hardware.
The rigger is the part of the system that understands what all of it is about to do.
NÆXON — Built for the trades that build America.
