Working load limit calculator. html>jc Working load limit calculator. The formula for calculating the SWL of a wire rope is as follows: makefile. Working Load Limit is calculated by dividing the minimum breaking strength of the chain by the assigned safety factor rating. For mobile cranes the mass (weight) of the hook block is part of the load”. Mar 26, 2014 · In some instances the working load limit of the chain is reduced to 50%! For example: One 3/8″ Grade 80 double sling used at 90˚ would have a working load limit of 2 times the working load of a 3/8″ Grade 80 single or 2 x 7, 100 lbs. Working load limit is always a fraction of tensile strength, allowing for a generous margin of safety. ) Working Load Limit for Crosby Blocks indicates the maximum load that should be exerted on the block and its connecting fitting. These limits are provided by the calculator and you can find them in the spring analysis of your design. D is the diameter of the wire rope in inches (in). Step 2 Span Table: Select the appropriate table in Span Tables for Joists and Rafters. Working Load Limit: The working load limit (WLL) or previously known as safe working load (SWL) indicates the ultimate working load designated by the manufacturer. The working load limit for Crosby Blocks indicate the maximum load that should be exerted on the block and its connecting fitting. 74mm (1-1/4 x 0. Snatch Block Rigging Calculator. The same double sling used at 35º would have a maximum working load limit of 57% of 14,200 The Working Load Limit (WLL) Calculator is a critical tool used in the field of material handling, construction, and rigging. Aug 18, 2023 · A pallet rack load capacity calculator is a digital or manual tool designed to ascertain the maximum load a pallet rack system can safely accommodate. Dec 14, 2021 · The term Working Load Limit (WLL) refers to the maximum amount of tension that can be applied to a new and undamaged chain. Units and Measures Calculator included! Rated Capacity Calculator included! Nov 29, 2023 · Often abbreviated as WLL, the Working Load Limit is the maximum load or force that a piece of lifting equipment, such as a sling, shackle, or hoist, is rated to safely handle during normal operation. The working load limits of tiedowns used for cargo securement on commercial motor vehicles may be determined by using either the tiedown manufacturer’s markings or by using the tables shown below. federal regulations, the working load limits listed in the tables are to be used when the tiedown material Apr 25, 2021 · In this episode, Zach Hayes, District Sales Manager & Product Trainer, answers a question from an anonymous viewer: "How to determine if the working load lim What is the Revised NIOSH lifting equation? The equation is: LC x HM x VM x DM x AM x FM x CM = RWL&nbsp; where LC is the load constant (23 kg) and other factors in the equation are: HM, the Horizontal Multiplier factorVM, the Vertical Multiplier factorDM, the Distance Multiplier factorFM, the Frequency Multiplier factorAM, the Asymmetric Multiplier factorCM, the Coupling Multiplier factorRWL The Working Load Limits (WLL) listed in the tables below are the maximum weights which slings are designed to sustain in general lifting service, according to the standard uniform load method of rating. The WLL is the maximum weight that a lifting device or rigging component can safely handle under normal conditions. Required Line Pull (LBS. *, †, ††, ‡ (See footnote at bottom of Table 5). Apply the design factor (4 in this example): WLL = Breaking Strength / Design Factor. Step 3: Determine the Weight of Object. How do you calculate Aggregate Working Load Limit for tiedowns? To calculate Aggregate Working Load limit, add together: 50% of the WLL of each end section of a tiedown that is attached to an anchor point. Load limits are based on a safety factor of 5 to 1. ), the aggregate working load limit for this securement system is 8,000 lbs. Safety Check: Before lifting, inspect the chain and fittings identification markings to ensure the sling is correctly tagged. To meet safety requirements, the aggregate working load limit of the devices you use must be at least 50% of the total weight of all the pieces of cargo you are hauling. VIEW OUR CHAIN SLINGS. To calculate the working load limit, the following formula is typically used: Working Load Limit = Minimum Breaking Strength / Safety Factor. 6 mmsq. Double braided high-quality nylon is a bit stronger with a WLL range of 25% - 35% of breaking strength. WLL refers to the maximum allowed weight that a piece of rigging can handle under normal conditions. For choker hitch, the angle of choke shall be 120 degrees or greater. WLL is 1/3 of the breaking strength rating, therefore a strap with a WLL of Nov 21, 2018 · The Safe Working Load is the mass that lifting equipment, usually a wire cable, can safely hold without fear of breaking. The result is the Safe Working Load in tons. This sets an allowable first-floor live load of 40 psf, a dead load of 10 psf, and a deflection of L/360. Another advantage of steel stillages is the design load can be massive – accommodating working loads up to 20,000Kgs – and still be moved to suit large fork trucks. ) ** Hoist Ring Bolt Torque Feb 7, 2024 · The SkyCiv I beam load capacity calculator is a free tool to help structural engineers calculate the capacity (or strength) of an I beam, as defined by the AISC 360 Steel Design Standard. Alternatively, this value is often defined as the minimum force a product must withstand before failure. Be mindful of the working load limit always being 1/3 of the breaking limit. The Crane Calculator operates on a simple, yet crucial principle. 89 kN) would have a SWL or WLL of 400 lbf (1. 3-strand high-quality nylon generally has a range of 20% - 25% WLL of breaking strength. In order to reach a working load limit, you will need to divide the breaking strength by three to reach the Safe Working Load Limit. 25 kN/m2. Usually shear governs for short spans, and bending governs on longer spans. Table 2 HR-125C Swivel Hoist Ring to Grade 8 Chain Working Load Limit 4:1 (lbs. Breaking point is the maximum stress before the product fails or breaks. Review vital hardware specs for shackles, hooks, eye bolts, and hoist rings. The WLL is typically expressed in This sling has a Working Load Limit of 500 lbs. Order your selected sling fully assembled and ready to use. Nov 4, 2023 · Calculate WLL : Using the Breaking Strength from the manufacturer’s data, let’s say it’s 40,000 pounds. It will also store Working Load Limits of straps for future use and links to the FMCSA Aug 20, 2019 · This is where the term Breaking Strength often will come from. The force represented by this load is much less than the force required to cause the lifting equipment to fail or yield. Use an Industrial Scale. As such:WLL = MBL / SF. Detailed explanations of the calculator’s working Working load limits for eye bolts are based on a straight vertical lift in a gradually increasing manner. 2 for further guidance. SWL = D² × WLL. But when a sling is lifting at an angle, as a two legged sling will, the load increases. For sling angles other than those shown, use the rated load for the next lower angle or a qualified person shall calculate the rated load. Formula to calculate the SWL overhead crane capacity. This easy-to-use tool let you perform such To calculate rate: k = F ÷ x. This is rare but achievable, whereas pallet racking loads generally max out at approximately 3,000Kgs. For example, a 10,000-pound breaking strength would be a 3,333 lb working load limit as this is the safe amount that the straps are rated for by the Working Load Limit (WLL) and Safe Working Load (SWL) are terms commonly used in the industry to describe the maximum load that lifting equipment can safely handle. Working Load Limit (WLL) refers to the maximum load that you can safely apply to equipment without causing damage or failure. Please only use this information for reference. It’s illegal to overload your vehicle. The WLL is expressed as a percentage of ship design MBL and should be used as a limiting value in both ship design and operational mooring analyses. I use working stress, not ultimate strength. Working Load Limits for Steel Strapping Working Load Limits for Wire Rope Size WLL Size WLL Size WLL 45mm (1-3/4in) 790kg (1,750lb) 31. ) Lower Block (LBS. S. Jan 18, 2024 · Our next step is to check if this deflection is less than the allowable deflection for our given beam span. Adjusted Choker Working Load Limit per Sling (lbs. For example, if the UBS is 10,000 pounds with a 5:1 safety factor, the WLL is 2,000 pounds (10,000 / 5). A single sheave block used to change load line direction can be subjected to total loads greatly different from the weight being lifted or pulled. Working Load Limit (WLL) is the maximum working load designed by the manufacturer. divided by two legs – 500 lbs. The Lifting belt should be able to lift the load safely without breaking during the process. load per leg if You can get your straps, chains, tarps, and more from Mytee Products or by calling us at 1-888-705-8277. 154 load factor (from table) = 577 lbs. 25+6) kN/m2 = 12. To calculate rate: k = F ÷ x. Where LC is the lashing capacity (kg) LR is the lashing rating (daN) (decaNewtons) To calculate the lashing capacity, multiply the lashing rating in deca-Newtons by 2. You don’t need to engage in the meticulous calculation of this 20%. May 21, 2022 · To distribute the loads let us consider the result of the Loads that we previously calculated: Total Dead Loads (e. Design load capacity. Dec 3, 2019 · Before using a piece of load-bearing equipment, always make sure to look at the working load limit before use as it is the maximum allowable loading force. It assists professionals in determining the safe maximum weight that a piece of lifting equipment or rigging gear can handle without risking failure or compromising safety. Aug 31, 2022 · The safe working load (SWL) can be called the Normal Working Load (NWL)-All lifting equipment must have an SWL. It is a rated capacity and often referred to in pounds . 73 ÷ 0. Step 1: Determine the Volume of the Load. T. Our app lets you work in standard or metric measurements and gives you the option to enter custom article lengths and weights. So, if a product has a breaking strength of 10,000 pounds, it must withstand that force once The working load limits listed in the tables are to be used when the tiedown material is not marked by the manufacturer with the working load limit. WLL = 40,000 pounds / 4 = 10,000 pounds. Weight (lbs): Angle (degrees): Calculate Load Limit. Ancra’s free mobile app helps you determine the minimum strap requirements to comply with FMCSA and CCMTA. The more up-to-date phrase for the term SWL is Working Load Limit, or WLL. So if a ratchet strap has a breaking strength of 15,000 pounds, then the strap will have a working Safe Working Load, SWL, (or Normal Working Load, NWL) is an outdated term that was used to indicate the amount of weight that a lifting device could safely carry without fear of breaking. The Safety factor, also known as the Design Factor, refers to the ratio between the WLL and Break Strength and determines the safety of your equipment. Safety Factor = 5. That means 20,000 pounds of cargo must be secured with chains and binders with a minimum WLL of 10,000 pounds. Multiply 500 lbs. Please note that some tasks within this task set are above a Level 3. = 14,200 lbs. Here’s an explanation of the terms in the formula: Working Load Limit: The maximum load or weight that a lifting device or equipment can safely handle. Slings should have a minimum design factor appropriate to the type of material as specified in the appropriate section. Working Load Limits. 5 kgs/mmsq (approx) Cross section area of round bar. Calculating the Weight of a Load. Block weight = 11,880 lbs. by 1. In industries where lifting and rigging are common, ensuring safety is paramount. You will often see the working load limit of a product on its package, and manufacturers provide the working load EXAMPLES OF HOW TO CALCULATE SLING LEG LOADS 1. Mar 16, 2017 · This is not my area of expertise and I seek your help. This limit is set by the manufacturer. As such, a strapping system with a working load limit of 5,000 pounds has a break strength of 15,000 pounds. 73 for the angle and 0. Sep 1, 2010 · To comply with the national and class regulations, ships’ derricks designed to operate as single swinging derricks are initially tested with a proof load that exceeds the specified safe working load of the derrick by the following amounts: SWL less than 20 tonnes—25% in excess of SWL. Line Pull. By inputting the crane’s rated capacity, tipping radius, and load radius into the calculator, it computes the safe working load. 5 for the reeve. An example of this would be a chain that has a MBL of 2000 lbf (8. One factor not to be overlooked is the deterioration of filaments from exposure to sunlight. Step 2: Determine the Material You’ll Be Lifting. 62 tonnes. Horizontal sling angle is 60 degrees. Now that we understand the working loads we can better comprehend the limits. Get your cargo control from us at excellent prices so you can haul safely, and earn more! Two major accepted tie down methods for securing a load. Today, SWL isn't used anymore because the term is completely replaced with WLL and MRC. Avoid side loading or angular loading unless otherwise noted by the manufacturer. the WLL is calculated by dividing the MBL by the Safety Factor (SF). In exceptionally hazardous conditions, or in any other circumstances which might indicate a need for a WLL lower than the designed figure, the The total WLL required for safe transport on a flatbed trailer is equal to one-half of the total weight of the cargo being carried. All sizes are individually proof tested to 2-1/2 times the Working Load Limit. It considers key factors such as beam capacity, the number of beams, and the number of levels in the system to produce accurate results. Tie-downs that pass over the cargo work by increasing the effective weight of the cargo (make the cargo seem heavier). Under U. Jul 15, 2010 · SWL = weight angle factor x reeve factor. in a vertical hitch. 4 days ago · We calculate the stress, using the stress formula: σ = F/A = 30×10³ / (1×10⁻⁴) = 300×10⁶ = 300 MPa . for its application. For instance, a winch strap with a WLL of 6,000 pounds should not be used to secure any load above that weight, as it exceeds what it is rated for. 5 Therefore: SWL = 4 ÷ 1. Tensile strength of 304 SS = 505 MPa =51. Jan 13, 2021 · The working load limit of a rigging system is equal to 1/3 the amount of the break strength. Jul 27, 2023 · Lashing Capacity Formula. k = Rate. F = Load. , etc. Shoulder Eye Bolts Never Exceed Working Load Limits. ) Upper Block (LBS. (1,820 kgs. Features that affect the rated capacity of the sling and that shall be considered in calculating the design factor are Ω Ultimate Load is 4. The following equation is used to calculate the Lashing Capacity. As indicated in previous sections, the working load limit should be stamped, pressed, printed, tagged, or otherwise indicated on all rigging equipment. 94 tons. Quenched Read More » The Working load limit (WLL) is much different than the breaking strength or tensile strength. These limits are provided by the calculator and you can Default Working Load Limits. LC = LR * 2 LC = LR ∗ 2. Knowing the difference between the WLL and Breaking Strength will help determine the safety factor. This ensures the crane doesn’t exceed its limits, providing a safe environment for Nov 6, 2023 · The safety factor varies depending on the industry or application for equipment but typically ranges from 2:1 to 6:1. Block Loading Calculator. = . The steeper the tie-down angle, the less shifting (ideally more than 45). , self-weight and SDL)= (6. Some factors determining workload Working load limits (WLL) are a percentage of the breaking strength and are safe operating limits for that particular component. However, here is a general formula that can be used to calculate the safe working load (SWL) of an overhead crane: SWL = (Crane weight + Maximum load weight) x Crane duty factor. The capacity of a bridle at a 30 degree horizontal is same as single Nov 13, 2019 · The aggregate working load limit is the sum of the working load limits for each device you use to secure your load. In designing a steel I beam member, determining how much strength or capacity it has is an important step. The formula to calculate the overhead crane capacity depends on the type of crane and the specific application. You need to factor a “safety factor” into your calculations. While they have been used interchangeably in some contexts, they have distinct meanings in different regions and standards. configuration, position of the load). So, in this scenario, the Working Load Limit (WLL) for the crane hook is calculated to be 10,000 pounds. Simply put, the Rated Capacity of a Mobile Crane is everything being will stretch by 9% when used at its maximum working load limit; this stretch usually dissipates when the load is removed. Polypropylene can be protected from Mar 28, 2024 · Definition and Importance of WLL. MRC stands for Maximum Rated Capacity. Never use regular nut eye bolts for angular lifts. In document Lifting Rigging (Page 58-65) Knowledge of working load limits (WLLs) is essential to the use of ropes, slings, and rigging hardware. The WLL is a fraction of the ultimate breaking strength—it includes a safety margin to ensure the stability and longevity of the equipment. Avoid side loading. This means a factor of 1. 2. The Dead Load, Superimposed Dead Load and Live Load that we consider will be carried by the slab. Tiedown materials which are marked by the manufacturer with working load limits that differ from the tables, shall be considered to have a working load limit equal to the value for which they are Mar 22, 2024 · Breaking strength, often shortened to MBS, is a self-explanatory term relating to the load at which a product fails, like a tow strap or shackle. For overhead lifting where human safety is involved you should use Grade 80 or above. 73 Reeve factor 0. For that, we use the deflection criteria provided by the 2012 International Building Code, stating that beams under a combination of dead load (permanent load) and live load (loads that can vary in time) should at most have an allowable deflection equal to the span of the beam divided by 2. For example, 40,000 pounds of cargo must be secured with chains and binders with a minimum WLL of 20,000 pounds together. Millwrights must understand how to use calculations to locate the correct sizes used in lifting and for each piece of equipment used in the lift. The WLL is generally 1/5 to 1/4 the breaking strength. Ensuring the right WLL for a given load is easy when chains and binders are rated equally. What is aggregate rated capacity? Jun 23, 2023 · Detailed Explanation of the Crane Calculator’s Working. The main difference between the two terms is that SWL is the older term. On every sling, the tag shows the WLL for different configurations: basket, choke, or vertical. Something to keep in mind is the working load limit is always 1/3 of the breaking strength. lbs. Once you have this information you can begin by entering your vehicle details below. Dec 18, 2013 · Multiply the chain's working load limit by the cosine of the angle between the chain and vertical to get the adjusted limit. In a vertical lift, where the sling is connected at each end and hanging vertically, it can lift exactly the number specified on the tag. Total Live Load = 2 kN/m2. Horizontal sling angles of less than 30 degrees are not recommended. Used in a basket hitch with the legs at a 60° angle to the load, it would have a working load limit of 866 lbs. It is the responsibility of the user The aggregate working load limit of all indirect tiedowns is the sum of the working load limits of each indirect tiedown. One crucial aspect is determining the Working Load Limit (WLL) for any lifting operation. According to OSHA, “Employers must ensure that rigging equipment not be loaded in excess of its recommended safe working Know the working load limit for alloy chain, synthetic, and wire rope slings instantly. . g. Sum the vertical forces to find the vertical reaction at A: RyA = 30 kN - 15 kN = 15 kN. SWL, also known as Normal Working Load (NWL), refers to the maximum force or load that equipment can handle without the risk of failure. 7 x . The standard safety ratio for any lifting device, such as chain slings, ratchet straps, and Aug 25, 2023 · The Working Load Limit (WLL) is the maximum working load designed by the manufacturer. </p> <p>For more information on the topic of Working Load Limit you can&nbsp;<a title="Differences Between D. This can result in the decision to select a wide small pitch leaf chain to help keep the pulley diameter small. 785 x45 x45 = 1589. To calculate the WLL, divide the ultimate breaking strength by the safety factor. Where: SWL is the Safe Working Load in pounds (lbs). 50% of the WLL of each end section that is attached to the cargo. Exceeding the maximum limit can be threatening to the worker's safety. Angular lifts will significantly lower working load limits and should be avoided whenever possible. Working load limit is generally set by the manufacturer and is the maximum force that should be used when using the product. The WLL is calculated by dividing the breaking load limit (BLL) by a safety factor (SF). To calculate the SWL, you’ll need to know the diameter of the rope in inches, and apply it to the formula SWL = D x D x 8. For example: Two slings have a 60° angle between them and are both reeved around a 4 tonne square load. The rated capacity must not be greater than 87% of the hydraulic capacity at maximum reach/radius. An example of this would be a chain that has a BL of 2,000 lb Dec 1, 2023 · The Working Load Limit (WLL) in a lifting equipment calculator is determined based on specific formulas for different types of lifting equipment. There must be no more than 75% of the tipping load for stationary lifting and no more than 66% of tipping load for pick & carry lifting. Here are the formulas and variables involved: Wire Rope Slings and Chain Slings: WLL=Diameter×Breaking StrengthSafety FactorWLL=Safety FactorDiameter ×Breaking Strength. The working load limits listed in the tables are to be used when the tiedown material is not marked by the manufacturer with the working load limit. Aug 5, 2021 · Working Load Limit is defined as the maximum load to be applied to a product when the load is uniformly applied in a straight line pull only. Example: Aug 20, 2019 · Working load limit is defined as “the maximum load which should ever be applied to the product, even when the product is new and when the load is uniformly applied”. SWL 20–50 tonnes—5 tonnes in excess of SWL Application of Slings for lifting considerations and sling lifting load calculations (bottom). ) Calculator Usage: This calculator is provided for general purpose use only. Copy code. For wire ropes, it’s common for the working load limit to be set at 20% <p>WLL and SWL are abbreviatons for Working Load Limit (WLL) and Safe Working Load (SWL). Field Calculation Formula. x = Distance Traveled. Used in a basket hitch with the legs at a 90° angle to the load, it would have a working load limit of 1,000 lbs. Weight 4 tonnes Angle factor 1. If the machine is articulated this reduces to 50% (Plant Assessor, 2018) . Always use shoulder nut eye bolts for angular lifts. The working load limits are the maximum load your spring can withstand and the maximum travel it can reach (considering solid height). Here’s a brief explanation of the differences: Aug 4, 2015 · SWL or WLL are calculated by dividing MBL by a safety factor (SF). 78 kN) if a safety factor of 5 (5:1, 5 to 1, or 1/5) is used. To get started calculating your vehicle's load limit, you'll need to make a note of your vehicle's load rating from your vehicle's owners manual as well as the Rhino-Rack Roof Rack system you have installed on your vehicle. In simpler terms, when you have a lifting belt to carry a load from point A to point B. It is a calculation of the Minimum Breaking Strength, or MBS. 5 times Working Load Limit for 7000# Hoist Ring when Tested in 90° orientation. Wire ropes usually have a working load limit of 20% of the tensile strength. ). 029in) Oct 13, 2015 · @ LRU I think you’ve calculated the load at which point the beam will “yield” or “fail” in bending. Here you will find key factors when calculating the working load limit (WLL) of chain slings, such as the angles of use, safe operating temperatures and grade. The ultraviolet radiation will cause the outer filaments to become brittle and break. actual load per leg. Always apply load to eye bolt in the plane of the eye. Tension these tie-downs to as high an initial tension as possible. Figure 2. Calculate the Safe Working Load ( SW L S W L) for a structure with a Minimum Breaking Strength ( M BS M B S) of 50,000 50, 000 pounds and a Safety Factor ( SF S F) of 3 3. For angular lifts, adjust working load as shown above. If an angular lift is required, a properly seated shoulder pattern machinery eye bolt Chain Slings Load (Safety) Chart. Materials (optional): Attached document - Understanding Working Load Limits for Hoisting and Rigging. 5 = 4. Pen and paper. Total load is 1,000 lbs. Any lifting equipment that carries a piece of load Dec 3, 2019 · Working Load Limit (WLL): the maximum load that a mooring line should be subjected to in operational service, calculated from the standard environmental criteria. This load represents a force that is much less than that required to make the lifting equipment fail or yield. Live loads and deflection limits are set by code. Know the differences, calculating WLL and way of direct and Indirect tie downs. Remember, the working load limit will determine how much you should allow the system to hold, not the break strength. Used in a choker hitch, it would have a capacity of 375 lbs. Finally, we divide the stress by strain to find the Young's modulus of steel: As a fraction of the tensile strength, it allows for a reasonable margin of safety. It is an important specification provided by manufacturers to ensure the safe and proper usage of lifting gear. Better safe than sorry. For example, if 1000 lb rated chains are at 45 degrees to the vertical their safe working load limit is reduced to 707 lbs. All catalog ratings are based upon usual environmental conditions and consideration must be given to unusual conditions such as extreme high . / 5. Sum the moments at pin support A to find the vertical reaction at roller support B: RyB = 30 kN × 3 m/6 m = 15 kN. Feb 4, 2024 · The formula to calculate Safe Working Load ( SW L S W L) given the Minimum Breaking Strength ( M BS M B S) and Safety Factor ( SF S F) is: SW L = M BS SF S W L = M B S S F. A single sheave block used to change load line direction can be subjected to total loads greatly different from the Sep 21, 2020 · Note: The effective length of a sling is the distance between the two working surfaces. O. 3. This increases the pressure of the cargo on the deck and keeps the cargo from shifting. (3,640 kgs. Rated Capacity is, ( as defined in BS EN 13000:2004, Cranes – Mobile Cranes) “load that the crane is designed to lift for a given operating condition (e. Jan 18, 2024 · To calculate this: Draw the beam's free body diagram, including the equivalent point load for the weight. Refer to the Manufacturer’s Specifications or Catalog Data. 1. Steel stillages for tyre management and storage The Working Load Limit is the maximum load which should ever be applied to the product, even when the product is new and when the load is uniformly applied – straight line pull only. These tables are from the ICC International Residential Code. How to Calculate WLL. Refer to AS 3775. Jul 28, 2023 · Safe Working Load (SWL) and Working Load Limit (WLL) are used in engineering and material handling fields to denote the maximum capacity equipment or hardware can safely handle. I have used for my back of envelope, the following method : Working Load Limit = Minimum Breaking Load / Safety Factor. In this picture, if each tiedown has a working load limit of 4,000 lbs. Oct 17, 2018 · Working Load Limit. Always tighten nuts securely against the load. Tiedown materials which are marked by the manufacturer with working load limits that differ from the tables, shall be considered to have a working load limit equal to the value for which they are How do you calculate Aggregate Working Load Limit for tiedowns? To calculate Aggregate Working Load limit, add together: 50% of the WLL of each end section of a tiedown that is attached to an anchor point. The bearing pressure calculation is as follows: (kN/mm2) total load on chain (kN) ÷ bearing area (mm²) With booms, there is often more space availability in width than there is in height as the booms pass over each other. law mandates that the weight of the cargo must be tied down with 50% of the cargo weight’s Working Load Limit cumulatively. WLL is the Working Load Limit, which is a factor provided by the manufacturer and represents the maximum load the rope can safely handle. load per leg if vertical lift. wm ro it jc fb jb ph nf no rb

Working load limit calculator. Horizontal sling angle is 60 degrees.