Modern cranes give a digital display of SWL, angle indicator, boom limit switch, and alarm for exceeding load.ĬLICK HERE FOR 👉 DOWNLOAD BIS 2762 (2009): Wire Rope Slings and Sling Legs The factor of safety / Safety factor Sometimes, it is de-rated(decreased) due to defect in welding, bend in angle, bracing, etc., and condition of clutch, brake, etc. Safe Working Load is generally tabulated in the load chart of the crane. Safe Working Load (SWL) of any mobile crane depends on the operator’s skill, condition of the ground, boom length, the radius of rotation while lifting the load, the inclination of the boom to the vertical and outrigger blocked or free. SWL = SWL of single vertical hitch × H/L × 4įor hoist, lift, cranes, etc., Safe working Load is recommended by the manufacturer. SWL = SWL of single verticle hitch × H/L × 2 A thumb rule formula isįorsling, SWL depends on the length of the sling leg (L) and the headroom between the hook and the load (H). It should also indicate the date of the last inspection.įor wire rope, FS is 6 for general purpose and 7 for heavy industry. The tally plate also indicates the identification number which can be mentioned in the test certificate held by the user. Lifting equipment should have a tally plate indicating the Safe Working Load. A table showing the SWL (Safe Working Load) of every kind and size of chain, rope, or lifting tackle in use, and in case of multiple slings, the SWL at different angles of the legs, shall be posted in the storeroom.Where the safe working load may be varied by the raising or lowering of the jib, a table indicating the SWL at the corresponding indication of the jib or corresponding radii of the load shall be attached with the jib-crane.The safe working load has to be specified by a competent person after testing and examination.

“No lifting machine and no chain, rope or lifting tackle shall, except for the purpose of the test, be loaded beyond the safe working load which shall be plainly marked and duly entered in the prescribed register, and where this is not practicable, a table showing the safe working loads of every kind and size of lifting machine or chain, rope or lifting tackle in use shall be displayed in prominent positions on the premises”ĬLICK HERE FOR 👉 EOT CRANE SAFETY Rule 60 of the Gujarat Factories Rules 1963 Safe working load require that:

“The maximum safe working load ( SWL) shall be plainly marked on every hoist or lift, and no-load greater than such load shall be carried thereon” Section 29(1)(b) of the same Act, prescribes as under:

Section 28(1)(c) of the Factories Act, prescribes as under:

It must be clearly marked on any lifting device (hoist, lifts, lifting machines, and lifting tackles). Safe Working Load (SWL) is the limiting safety factor to lift and carry any load safely.

Crane lifting belt size chart