Kulkoni, Inc. 1-800-231-2357

Page 87 Kulkoni, Inc. v921 WARNING: NEVER EXCEED WORKING LOAD LIMIT Example Calculations for determining a total load value on a single line system (a gin pole truck lifting 1,000 lbs.). There is no me- chanical advantage to a single part load line system, so winch line pull is equal to 1,000 lbs. or the weight being lifted. To determine total load on Block A: A = 1,000 lbs. x 1.81 = 1,810 lbs. (line pull) (factor 50° angle) To determine total load on Block B: B = 1,000 lbs. X .76 = 760 lbs. (line pull) (factor 135° angle) Angle Factor Multiplier Angle Factor Angle Factor 0° 2.00 100° 1.29 10° 1.99 110° 1.15 20° 1.97 120° 1.00 30° 1.93 130° 0.84 40° 1.87 135° 0.76 45° 1.84 140° 0.68 50° 1.81 150° 0.52 60° 1.73 160° 0.35 70° 1.64 170° 0.17 80° 1.53 180° 0.00 90° 1.41 - - SELECT THE CORRECT SNATCH BLOCK In general, the products displayed are used as parts of a system being employed to accomplish a task. Therefore, we can only recommend the snatch block(s) to be used within the Working Load Limits, or other stated limitations. It is necessary to determine the total load being imposed on each block in the system to properly determine the rated capacity block to be used. A single sheave block used to change load line direction can be subjected to total loads great- ly different from the weight being lifted or pulled. The total load value varies with the angle between the incoming and departing lines to the block. Thus, there are several critical steps to selecting a correct snatch block for a given applica- tion including: (1) identify the weight of the load to be lifted or moved; (2) determine the total load on each block in the system; and (3) determine sheave size & wire rope strength. 1. Identify the Weight of the Load to be Lifted or Moved 2. Determine the Total Load on Each Block in the System Use the following chart to identify the factor to be multiplied by the line pull to obtain the total load on the block. SNATCH BLOCKS - WARNINGS AND INFO. GENERAL PRECAUTIONS Ratings shown are applicable only to new or "like new condition" products. Working Load Limit ratings indicate the great- est force or load a product can carry under usual environmental conditions. Shock loading and extraordinary conditions must be taken into account. The Working Load Limit or Design (Safety) Factor may be affected by wear, misuse, overloading, corrosion, deformation, intentional alteration, and other use conditions. Regular inspection must be conducted to determine whether use can be continued at the catalog assigned WLL, a reduced WLL, a reduced Design (Safety) Factor, or withdrawn from service.