Two Signalpersons, One Operator, and a Stop From a Stranger
You are the signalperson at the pick point on the ground. A second signalperson is on the third deck at the set point. The operator, 220 ft away, can see only the deck signalperson. No radios are available. A pipefitter on the deck, tired of waiting, gives the operator a 'swing left' hand signal. A laborer below, who sees a sling slipping, shouts and gives a stop signal. The deck signalperson starts relaying your signals but is standing where he cannot see the load's path over the parapet. A relief signalperson arrives for the second half of the shift; nobody has his qualification record.
1. How is a two-signalperson hand-signal relay supposed to work, and what is wrong with this one?
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How it works: the person who can see the load originates the signal; the final signalperson repeats it exactly to the operator. The relay repeats - it does not interpret, improvise, or complete an unfinished signal. Each link must be able to see the next, and the operator must know which person he is taking signals from.
What is wrong here: the deck signalperson is relaying a signal for a load he cannot see. If the unit hangs on the parapet or swings into the wall, he will keep passing along a hoist command because he has no way to know the load has stopped moving. The relay has become a pipe, not a control.
Fixes, in order: reposition the deck signalperson so he can see the load's path and the set point; or move yourself so you can see both the load and him; or add a third person; or get radios and run one voice per crane. Any of these beats relaying blind, and none of them require guessing. Announce the change to the operator so he knows whose signals count.
2. The laborer shouts 'stop' and the pipefitter gives 'swing left.' Which does the operator obey, and what do you do?
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The laborer: yes, immediately. A stop or emergency stop signal must be obeyed regardless of who gives it. The operator does not verify the person's role or credentials first - a stop from a bystander is a safety valve, and treating it as unauthorized is how people get killed.
The pipefitter: no. Operational hand signals come only from the designated signalperson for that crane. The operator should not act on 'swing left' from an unauthorized person, and a competent operator will not.
What you do:
- Confirm the load is held and find out what the laborer saw - a slipping sling means the lift is over until the rigging is inspected and re-set, not just re-tensioned.
- Shut down the pipefitter's signaling in plain terms, and say it again at the next pre-lift meeting: who signals this crane, and that anyone may stop it.
- Fix the root cause the pipefitter was reacting to - waiting. Idle crews improvise.
Exam point: two different rules are in play. Stop signals are universal; operational signals are not.
3. The relief signalperson has no qualification record on file. What does the rule require, and what do you do?
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What is required: a signalperson must be qualified before giving signals. Qualification covers knowledge and competent application of the type of signals used (hand, voice, or both), a basic understanding of crane operation and limitations - including the dynamics of swinging and stopping a load and boom deflection from hoisting - and knowledge of the applicable signal and signalperson requirements. It is demonstrated through an oral or written assessment and a practical assessment, by a third-party evaluator or by the employer's own qualification process.
What you do: he does not signal. Land and secure the load, tell the lift director, and have the employer verify or establish his qualification before he takes over. A certification card is strong evidence of qualification, but it is not the whole job - he still needs a hand-off on this crane, these signals, this channel, and this lift plan.
Why this is a signalperson responsibility, not just a paperwork issue: the operator is entitled to refuse signals from someone who cannot show qualification, and you are the person whose name is on the signals for the first half of the shift. Handing the crane to an unverified voice is how a good lift turns into an incident nobody owns.