Basic Rigging Review

A double-wrap choker hitch should be used to lift a bundle of pipes. This type of hitch involves wrapping the lifting sling twice around the bundle and then passing the end of the sling through the choker eye. This creates a secure grip on the bundle, preventing it from slipping or shifting during lifting. Using a single-wrap choker hitch may not provide enough friction to hold the bundle securely, and a straight vertical hitch may not distribute the load evenly, leading to instability. Therefore, the double-wrap choker hitch is the most suitable option for lifting a bundle of pipes.

Wire rope slings should be inspected before every use to ensure their safety and reliability. Regular inspections help identify any potential damage or wear and tear that could compromise the integrity of the sling. By inspecting the wire rope sling before each use, any issues can be addressed promptly, reducing the risk of accidents or failures during lifting operations. This practice aligns with standard safety procedures and regulations to maintain a high level of safety in the workplace.

Hand signals are used to navigate loads in situations where verbal communication or automated systems may not be feasible or safe. This method involves using specific hand gestures or movements to convey instructions or commands to the crane operator or other personnel involved in the load navigation process. Hand signals are commonly used in construction sites, warehouses, and other industrial settings to ensure safe and efficient movement of loads.

The term "rated capacity" refers to the maximum load weight that a sling is designed to carry. This means that the sling has been tested and certified to safely handle a specific weight limit. It is important to adhere to the rated capacity to prevent overloading the sling, which could lead to accidents or damage to the equipment.

Shackles are made from forged steel because it is a strong and durable material that can withstand heavy loads and harsh conditions. Steel is commonly used in the construction of shackles due to its high tensile strength and resistance to corrosion. The forging process further enhances the strength and integrity of the steel, making it an ideal choice for shackles that need to securely hold and support heavy objects. Iron and concrete are not suitable materials for shackles as they lack the necessary strength and durability required for such applications.

To calculate the total sling stress applied during a lift, you need to know the angle at which the sling will attach and the total weight of the load. The angle of attachment affects the distribution of the load on the sling, with higher angles increasing the stress on the sling. The total weight of the load is crucial in determining the magnitude of the stress on the sling. Both factors are necessary to accurately calculate the sling stress during a lift.

If the tattle-tail has been pulled into the jacket, it indicates that the sling has been overloaded. This means that the weight or load on the sling has exceeded its maximum capacity, causing it to become strained or damaged.

The most widely used type of shackle is the screw pin shackle. This type of shackle is commonly used in various industries and applications because it is easy to use and provides a secure connection. The screw pin can be easily unscrewed to open the shackle and then screwed back in to lock it in place, ensuring that the load or equipment being secured remains safely attached. Screw pin shackles are versatile and suitable for a wide range of uses, making them the preferred choice for many professionals.

A shouldered eyebolt is used for angular loading because it has a shoulder or collar that provides additional support and prevents the bolt from rotating under load. This design is specifically intended for applications where the load is applied at an angle, as the shoulder helps to distribute the load evenly and prevent damage to the bolt or the surrounding structure.

A bridle hitch is used when two or more slings need to be attached to the same hook. It allows for equal distribution of weight and prevents any one sling from bearing the entire load. This hitch is commonly used in rigging and lifting operations to ensure stability and safety.

A chain hoist is operated using a gear system. The gears in the system help to increase the force applied to the chain, allowing for heavier loads to be lifted with less effort. The gear system also provides control and precision in lifting and lowering the load.

Tag line tenders are the only people allowed on a landing zone. A tag line tender is responsible for controlling and guiding the load during helicopter operations. They ensure that the load is properly attached to the helicopter and assist in maneuvering it to the desired location. Their presence on the landing zone is crucial for the safe and efficient execution of helicopter operations. Supervisors and load navigators may have important roles in the overall operation, but they are not specifically designated to be on the landing zone.

When lifting a load longer than 12 feet, it is recommended to use two double-wrap choker hitches. This is because a double-wrap choker hitch provides additional support and stability to the load, reducing the risk of it slipping or becoming unbalanced during the lifting process. Using two double-wrap choker hitches distributes the load's weight more evenly and helps to prevent any potential damage or accidents that could occur if only one choker hitch was used.

The sling stress is doubled at an angle of 30 degrees.

Most steel chain slings can be used at a maximum temperature of 500 degrees Fahrenheit.

A qualified person is the one designated to make the decision to keep a wire rope sling in service if damaged. This person has the necessary knowledge, skills, and experience to assess the extent of the damage and determine whether the sling can still be safely used. They are familiar with the relevant regulations and industry standards, ensuring that their decision aligns with safety guidelines. By entrusting this responsibility to a qualified individual, the risk of accidents or injuries due to damaged slings is minimized.

A grab hook is used on alloy steel chain slings because it has a specific design that allows it to securely grab onto the chain links, providing a strong and reliable connection. This type of hook is commonly used in lifting applications where a secure attachment point is needed to prevent the load from slipping or coming loose. The grab hook's design ensures that it can effectively grip the chain links, making it a suitable choice for use with alloy steel chain slings.

Eyebolts are commonly used for lifting heavy loads, and their safety is crucial to prevent accidents. Inspecting eyebolts once a year ensures that they are in proper working condition and can bear the required load. Regular inspections help identify any signs of wear and tear, such as corrosion or deformation, which could compromise their strength. By conducting annual inspections, potential issues can be detected early on and necessary maintenance or replacement can be carried out to ensure the continued safety and reliability of the eyebolts.