Introduction
Manual material handling plays a critical role in almost every industrial environment, where workers are frequently involved in lifting, carrying, pushing, pulling, stacking, and transporting materials. In industries, improper handling of loads is one of the major causes of workplace injuries, making safety practices and lifting techniques essential for accident prevention and productivity improvement.
This blog is specially prepared for Anna University – M.E. Industrial Safety Engineering students to provide a clear and structured understanding of Manual Material Handling and Lifting Tackles. It includes important questions and answers that are commonly asked in examinations, along with simplified explanations to support effective learning and revision.
The content covers key topics such as safe lifting methods, ergonomic considerations, handling of hazardous and heavy materials, use of lifting accessories like ropes, slings, jacks, and trolleys, as well as storage and transport safety practices. By focusing on both theoretical concepts and practical applications.
1. Mention the accessories for manual handling.
Manual handling refers to the lifting, carrying, pushing, and pulling of objects by hand, which can put strain on the body and cause injuries. To help prevent injuries and make manual handling safer, there are a variety of accessories that can be used. Here are some common accessories for manual handling:
Lifting belts:
These are belts worn around the waist that help support the back and prevent strain during lifting.
Lifting straps:
These are straps that can be wrapped around the object being lifted to improve grip and distribute the weight of the load.
Hand trucks:
These are two-wheeled carts that can be used to transport heavy or bulky objects.
Pallet trucks:
These are wheeled platforms used to move and transport pallets of goods.
Trolleys:
These are wheeled carts or platforms used to move goods or equipment around a workspace.
Slings:
These are straps or ropes used to lift and move heavy or bulky objects, such as pipes or machinery.
Lift tables:
These are hydraulic or pneumatic tables that can be raised or lowered to the desired height for lifting and moving objects.
Hoists:
These are mechanical devices that can be used to lift and move heavy objects, such as engines or machinery.
Conveyor belts:
These are mechanical systems used to move goods or materials from one point to another, reducing the need for manual handling.
Overall, the use of accessories for manual handling can help make lifting and moving objects safer and more efficient, reducing the risk of injury and strain on the body.
2.. How hazardous materials can be transported?
Hazardous materials, also known as HazMat, can pose a significant risk to public safety and the environment if they are not handled and transported properly. There are various regulations in place to ensure the safe transportation of hazardous materials. The following are some common methods for transporting hazardous materials:
Road transportation:
Hazardous materials are frequently transported by trucks on the roads. The Transport Departments have established specific regulations for transporting hazardous materials on the roadways. These regulations cover a wide range of requirements, such as labeling, packaging, and placarding of hazardous materials.
Rail transportation:
Rail is another common method for transporting hazardous materials. Rail cars carrying hazardous materials are subject to regulations established by the Indian Railways. These regulations cover safety requirements for rail cars, track, and employees.
Air transportation:
Some hazardous materials are transported by air, such as chemicals, gases, and radioactive materials. The International Civil Aviation Organization (ICAO) regulates the transportation of hazardous materials by air. These regulations include specific requirements for packaging, labeling, and documentation.
Water transportation:
Hazardous materials can also be transported by water, such as by ships or barges. The Coast Guards, the Flag states and port states are responsible for regulating the transportation of hazardous materials by water. Their regulations cover the design, construction, and maintenance of vessels carrying hazardous materials.
It is important to note that the transportation of hazardous materials requires specialized training, certifications, and permits. Additionally, shippers and carriers must follow strict guidelines for labeling, packaging, and handling hazardous materials to minimize the risk of accidents and exposure.
3. What are the uses of dollies and wheelbarrows?
Dollies and wheelbarrows are two common tools used for material handling and transportation. Here are some of their uses:
Dollies:
Dollies are small carts with wheels used to move heavy items, such as furniture, boxes, and appliances. They can come in various sizes and shapes, but most have a flat platform that can be loaded with items and pushed or pulled to move them. Dollies are useful for reducing the physical strain of moving heavy objects and can help make moving more efficient.
Wheelbarrows:
Wheelbarrows are also used to transport heavy items, but they are typically larger and designed to carry loose or bulky items such as soil, gravel, and construction materials. They consist of a single wheel, a deep, open container, and two handles for pushing or pulling. Wheelbarrows are particularly useful for landscaping, gardening, and construction projects where materials need to be moved from one location to another.
In summary, dollies and wheelbarrows are tools used for material handling and transportation. Dollies are best for moving heavy items like furniture and appliances, while wheelbarrows are designed for transporting loose or bulky items like soil and construction materials. Both tools can help reduce physical strain and make moving heavy items more efficient.
4. Define steel strapping and sacking.
Steel strapping and sacking are two materials commonly used in packaging and shipping to secure and protect goods during transport. Here's a brief definition of each:
Steel strapping:
Steel strapping is a strong and durable material made from high-tensile steel. It is used to secure heavy or bulky items for shipping, storage, or handling. Steel strapping is typically sold in rolls or coils and is available in various widths and thicknesses to accommodate different types of loads. To use steel strapping, a tensioner and sealer tool is typically used to tighten and seal the strapping around the item being secured. Steel strapping is often preferred for its strength and resistance to punctures and tearing, making it an ideal choice for heavy-duty applications.
Sacking:
Sacking is a type of material made from woven fabric, typically made from jute fibers. It is commonly used to package or transport bulk goods, such as grains, potatoes, or other agricultural products. Sacking is highly breathable, allowing air to circulate around the contents and preventing the buildup of moisture or humidity. It is also highly resistant to tearing and puncturing, making it ideal for transporting heavy or abrasive materials.
Sacking is typically sold in rolls or sheets and can be sewn or tied shut to secure the contents inside. It is often preferred over other types of packaging materials for its eco-friendliness, as it is biodegradablevand can be easily recycled or reused.
5. What are slings? What are the types of slings available?
Slings are flexible lifting devices used to hoist and move heavy objects in a variety of industries, including construction, manufacturing, and transportation. Slings are typically made of a strong, durable material such as synthetic fibers or metal wire rope and are designed to support the weight of the object being lifted while minimizing the risk of damage or injury. There are several types of slings available, including:
Synthetic fiber slings:
These slings are made from materials such as nylon, polyester, and polypropylene, and are lightweight and easy to handle. They are often color-coded to indicate their capacity and are available in different configurations, such as flat web slings and round slings.
Wire rope slings:
These slings are made from high-strength steel wire and are highly resistant to abrasion and cutting. They are often used in harsh environments such as marine and offshore applications.
Chain slings:
These slings are made from alloy steel chain links and are highly resistant to impact and crushing. They are often used in heavy-duty applications such as steel mills and foundries.
Slings are typically attached to a lifting device such as a crane or hoist, and are used to lift and move objects such as steel beams, machinery, and heavy equipment. It is important to choose the right type of sling for the specific application, and to follow all safety guidelines and regulations when using slings to prevent accidents or injuries.
6. What are cryogenic liquids? How are they to be stored and handled?
Cryogenic liquids are liquids that are kept at extremely low temperatures, typically below -150°C. These liquids include liquefied natural gas (LNG), liquid nitrogen, liquid oxygen, and others. Proper storage and handling of cryogenic liquids is essential to ensure the safety of workers and to prevent leaks and spills. Here are some guidelines for storing and handling cryogenic liquids:
Storage:
Cryogenic liquids should be stored in well-ventilated areas that are specifically designed for storing these liquids. Storage vessels must be designed and maintained to prevent leaks, and they should be inspected and tested on a regular basis. The storage area should be equipped with an alarm system that can detect leaks and alert workers in the event of an emergency. Flammable materials should not be stored near cryogenic liquids.
Handling:
Cryogenic liquids must be handled with care, and workers should be trained in the safe handling of these liquids. Protective equipment such as gloves and face shields should be worn to protect against exposure to the extreme cold. The transfer of cryogenic liquids should be done slowly and carefully to prevent splashing, which can cause cold burns or frostbite. Transfer hoses and equipment should be inspected and tested regularly, and they should be properly labeled and color-coded to prevent confusion.
Transportation:
Cryogenic liquids should be transported in containers that are specifically designed for this purpose. These containers must be properly labeled and equipped with safety devices such as pressure relief valves. During transportation, containers should be secured and protected from damage or tampering. Vehicles used to transport cryogenic liquids must be equipped with safety equipment such as fire extinguishers and spill control materials.
Emergency Response:
In the event of a leak or spill of cryogenic liquids, workers must be trained to respond quickly and effectively. Emergency response plans should be in place, and workers should know how to use emergency equipment such as spill control materials and personal protective equipment. Workers should also be trained to recognize the signs and symptoms of overexposure to cryogenic liquids, such as frostbite and asphyxiation.
Overall, proper storage and handling of cryogenic liquids is essential to prevent accidents and ensure the safety of workers. Anyone working with or around cryogenic liquids should receive training on the proper handling and safety procedures, and regular inspections and maintenance of storage vessels and equipment should be conducted.
6. What are the factors to be considered while inspecting hooks?
Hooks are a critical component of cranes and other lifting equipment, and they must be inspected regularly to ensure that they are in good working condition and safe to use. Here are some factors to be considered while inspecting hooks:
Visual Inspection:
The hook should be inspected visually for any signs of wear and tear, such as cracks, deformations, and excessive wear. Any distortion or elongation of the hook may indicate that it has been overloaded, and it should be replaced immediately.
Load Capacity:
The load capacity of the hook should be checked against the manufacturer's specifications. If the hook has been overloaded or damaged, its load capacity may have been reduced, and it should not be used until it is repaired or replaced.
Throat Opening:
The throat opening of the hook should be checked to ensure that it is not deformed or twisted. If the throat opening is out of round, the hook may not fit properly, which can lead to slippage or damage to the load.
Safety Latch:
The safety latch on the hook should be checked to ensure that it is functioning properly. The safety latch prevents the load from accidentally slipping off the hook and must be kept in good working condition.
Wear and Tear:
The wear and tear of the hook should be monitored, and any excessive wear should be noted. If the hook is worn down or has visible signs of damage, it should be replaced.
Hook Angle:
The angle of the hook should be checked to ensure that it is not bent or twisted. If the hook is out of alignment, it may not fit properly and could cause damage to the load or the lifting equipment.
Crack Detection:
The hook should be checked for any signs of cracking or other damage that could affect its strength and safety.
In summary, regular inspection of hooks is critical to ensuring the safety and effectiveness of lifting equipment. During the inspection, visual checks, load capacity, throat opening, safety latch, wear and tear, hook angle, and crack detection should all be carefully considered to identify any issues and ensure the continued safe use of the lifting equipment.