chuck lemon 2-14-07

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Tower Crane Safety Regulations

Chuck Lemon

Division of OccupationalSafety & Health

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Current

Regulations that cover Tower Cranes

WAC 296155525 ANSI B30.31990

OSHA 29 CFR 1926550 Subpart N

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Upcoming New Regulations

WAC 296880 (this number could change)

Available on L&Is Website

ASME B30.32004 (effective now, not

adopted in rule)

OSHAs New Crane Rule (C-DAC)

Available in OSHAs Website

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What the current rules say

WAC 296

525

(2)(a) Operate all cranes per manufacturers

specifications (2)(d) Designate a competent person to

inspect all machinery and equipment prior to

use and periodically during use to make sure

it is safe.

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WAC 296

525 (cont.)

(2)(e) Have a competent person, or a

government or private agency recognized byL&I perform a thorough annual inspection of

the hoisting equipment and maintain a

permanent record of these inspections.

(2)(f) A tag line must be used on all loadsthat swing freely. Tag lines must be held by

experienced persons.

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WAC 296

525 (cont.)

(5)(a) Tower Cranes must be erected,

jumped and dismantled under the immediatesupervision of a competent person.

(5)(b) Tower cranes must be erected,

maintained, and used per the manufacturers

specifications. All modifications must beapproved by the manufacturer and

engineered by a PE.

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WAC 296

525 (cont.)

(5)(c) A professional engineer must certify that the

crane foundations and underlying soil are adequate

support for the tower crane.

(5)(e) Prior to installing a climbing tower crane within

an existing building or new construction, a structural

engineer must certify that the building is designed to

withstand the torque & floor loading created by thecrane to be installed.

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WAC 296

525 (cont.)

(5)(f) Tower cranes erected on new

foundations must be tested per ANSI B30.3-1990 Chapter 3-1.

This test would include all functional motions,

limiting devices, and brakes for operation.

Limiting devices must be checked for propersetting.

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WAC 296

525 (cont.)

The functional tests must include slewing,

trolleying, and hoisting with frequent stops,starts, and reversals.

The functional motion test should continue

for 15 minutes during which all controls,

drives, and braking means engaged shallhave functioned correctly.

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WAC 296

525 (cont.)

(5)(f)(i) Load test not less than 110% capacity for 15

minutes at the maximum radius. Results of test must

be within the manufacturers specifications.

(5)(f)(ii) A record of each test must be made and

signed by the person responsible for conducting the

test. This record must be maintained at the

construction site and made part of the firmspermanent equipment records.

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WAC 296

525 (cont.)

(5)(j) Limit switches must be installed and keptproperly adjusted. Limit switches must provide the

following functions: (i) Safely limit the travel of the trolley to prevent it from

hitting the outer end of the jib.

(ii) Limit the upward travel of the load block to limit two-blocking

(iii) Lower over travel limiting devices must be provided forall load hoists where hook area is not visible to the operator

(iv) Limit the load being lifted in a manner whereby no morethan 110% of the maximum rated load can be lifted ormoved.

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WAC 296

525 (cont.)

(5)(k) Only use tower cranes for the proper handling

of freely suspended loads, they are not to be used

for pulling vehicles, removing pilings, pull away loadswhich are attached to the ground or walls.

(5)(p) Tower cranes must have a a functional

slewing brake. When crane is out of operation, the

jib/boom must be pointed downwind and the slewingbrake released so it can weathervane.

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WAC 296

525 (cont.)

(5)(q) Tower cranes must have a functional

braking system on the trolley. An automaticbrake or device must be installed which will

immediately stop and lock the trolley in the

event that the trolley rope breaks.

(5)(r) All electrical equipment must begrounded and protection must be provided

against lightning.

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WAC 296

525 (cont.)

(5)(t) All brakes must automatically set in

event of power failure. (5)(u) Climbing jack systems must be

equipped with over-pressure relief valves,

direct-reading gauges, and pilot-operated

hydraulic check valves. These must be ableto prevent jack from retracting should a

hydraulic line or fitting rupture or fail.

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WAC 296

525 (cont.)

(5)(v) During periods of high winds or

weather affecting visibility, i.e., fog, etc. onlyhandle loads that are consistent with good

safety practices. The practices must be

agreed upon by the operator and the person

in charge of the construction job, with dueconsideration given to the manufacturers

recommendations.

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WAC 296

525 (cont.)

(5)(x) Tower cranes must be inspected & maintained

per the manufacturers recommendations or more

frequently if reason to suspect a possible defect orweakening of any portion of the structure or

equipment.

(5)(y) Guy wires, wedges, braces or other supports

must be inspected at the beginning and midpoint ofeach work shift to ensure they are functioning as

intended.

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WAC 296

525 (cont.)

(6)(b) Tower cranes must not be erected or

raised when the wind velocity at the worksiteexceeds 20 MPH or as specified by the

manufacturer.

(6)(c) Tower crane operators must be trained

and experienced in tower crane operations. (6)(f) Buffers must be provided at both ends

of travel of the trolley.

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WAC 296

525 (cont.)

(6)(h) All hammerhead tower cranes must meet

the requirements for design, construction,installation, testing, maintenance, inspection, and

operation as prescribed by the manufacturer.

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Questions?

Contact information:

Chuck Lemon (360) 902-4669

[email protected]
mailto:[email protected]:[email protected]

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