NC STATE Home Page NC STATE UNIVERSITY - Environmental Health and Safety 2620 Wolf Village Way Cmpus Box 8007, Raleigh NC 27695  Phone 919.515.7915 FAX 919.515.6307 NC STATE Home Page

HOIST AND CRANE SAFETY

Purpose

The inspection procedure for hoists and cranes in regular service is in two general classifications based on the inspection intervals performed. The intervals are dependent on the nature of the critical components of the crane/hoist and the degree of their exposure to wear, deterioration or malfunction

The two general classifications are "frequent" and "periodic." Listed below are definitions and elements of both.

Objective

Most causes of chain failure can be detected before failure occurs if there is a proper inspection procedure. A good inspection plans for two inspections: one daily by personnel using the chain, the other biannually.

The former helps to detect those links and hooks that are visibly unsafe because of overloading, faulty rigging or other unsafe practices.

Procedure

1. Frequent inspection - Daily to monthly intervals

Inspect the following items for defects at intervals are defined with each section:

    a) All functional operating mechanisms for maladjustment interfering with proper operation on a daily basis.

    b) Deterioration or leakage in lines, tanks, valves, drain pumps, and other parts of air or hydraulic systems on a daily basis.

    c) Hooks with deformation or cracks. Visual inspection daily. Perform monthly inspection with a certification record which includes the date of inspection, the signature of the person who performed the inspection and the serial number, or other i dentifier of the hook inspected. For hooks with cracks or having more than 15 percent in excess of normal throat opening or more than 10<< twist from the plan of the unbent hood shall be discarded.

    d) Hoist chains, including end connections, for excessive wear, twist, distorted links interfering with proper function, or stretched beyond manufacturer's recommendations. Visually inspect hoist on a daily basis. Monthly inspect with a certification record that includes the date of inspection, the signature of the person who performed the inspection and an identifier of the chain inspected

2. Periodic inspection - 1-12 month intervals

Inspect for the following:

    a) Deformed, cracked, or corroded members

    b) Loose bolts or rivets

    c) Cracked or worn sheaves and drums

    d) Worn, cracked or distorted parts such as pins, bearings, shafts, gears, rollers, locking and clamping devices

    f) Excessive wear on brake system parts, linings, pawls, and ratches

    g) Load, wind, and other indicators over the full range, for any significant inaccuracies

    h) Gasoline, diesel, electric, or other powerplants for improper performance or noncompliance with applicable safety requirements.

    I) Excessive wear of chain drive sprockets and excessive chain stretch

    j) Electrical apparatus for signs of pitting or any deterioration of controller contractors. Limit switches and push-button stations.

3. Cranes not in regular use:
    a) If crane is idle for 1 month or more but less than 6 months, perform all the inspections listed above for frequent inspections.

    b) If idle for a period over 6 months will need a complete inspection as listed above for frequent and periodic inspection

    c) Prior to initial use all new and altered cranes shall have the following testing:

     

    • Hoisting and lowering
    • Trolley travel
    • Bridge travel
    • Limit switches, locking and safety devices

    d) The trip setting of hoist limit switches shall be determined by tests with an empty hook traveling in increasing speeds up to the maximum speed. The actuating mechanism of the limit switch shall be located so that it will trip the switch in sufficient time to prevent contact of the hood or hook block with any part of the trolley.

    e) Test loads shall not be more than 125% of the rated load unless otherwise recommended by the manufacturer. The test reports shall be placed on file where readily available.

4. Rope Inspection
    a) A thorough inspection of all ropes shall be made at least once a month and a certification record will include the date of inspection, the signature of the person who performed the inspection and an identifier fro the ropes inspected. The logs will be readily available. Any deterioration shall be carefully observed and determination made as to whether further use of the rope would constitute a safety hazard.