Chloe Zhang
Plastic drums are used for packaging foodstuffs, petroleum products, chemicals, flavourings, cosmetics, and pharmaceuticals. They are also used as floats for swimming rafts. Determining the bung size for a plastic drum is important to ensure that the contents are secure and do not leak. Bung sizes for plastic drums vary, with the most common size in North America being 63 mm or 2 inches. It's important to note that over-tightening a bung on a plastic drum can damage the bunghole and cause leaks.
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What You'll Learn
- Bung caps with gaskets for plastic drums are available in various sizes
- The correct seal is required for a leak-tight bung
- Bung adapters can save time, money and materials
- Bung caps with knockouts are versatile and compatible with most US-made drums
- Buttress threads are available in different sizes and vary by manufacturer
Bung caps with gaskets for plastic drums are available in various sizes
Standard drums usually have two openings or bungholes. One is typically a fine thread, with a size of 2" NPS (National Pipe Straight) in North America. The other, smaller bunghole, is often either a large or small size. A large bunghole is usually a 63 mm buttress, although it may be referred to as a 2" buttress, which is inaccurate. The smaller bunghole is usually 3/4" NPSM (National Pipe Straight Mechanical).
When selecting a bung cap with a gasket, it is crucial to choose the correct size. Bung caps with gaskets are available in various sizes, including 2" and 3/4" options, to accommodate the different bunghole sizes. These caps are designed to create a tight seal and prevent leaks. It is important to note that the thread type and pitch should also be considered when selecting a bung cap, as there are different thread types such as NPS, NPT, and Buttress, each with unique characteristics.
Additionally, the type of gasket material should be chosen based on the contents of the drum. Different gasket materials, such as rubber, PE, or S.EPDM, are suitable for different applications. For example, when dealing with flammable liquids, specific gasket types can provide additional protection. Customizable gasket options are also available to meet specific requirements, such as chemical resistance or temperature tolerance.
By considering the size of the bunghole, the thread type, and the gasket material, you can select the appropriate bung cap with a gasket for your plastic drum. These caps provide a secure and leak-proof seal, ensuring the safe containment of various substances.
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The correct seal is required for a leak-tight bung
To ensure a leak-tight bung, the correct seal is required. The type of seal depends on the contents of the drum. For instance, rubber, PE, and S.EPDM seals are all options. When using a plastic drum, it is important not to over-tighten the bung, as this can damage the bunghole, hindering the fitting of the capseal and potentially causing leaks. Over-tightening can also result in the stretching or splitting of the bunghole. This is less of an issue with steel drums, but over-tightening can still crush the seal, reducing its efficiency.
To avoid leaks, it is essential to use the correct type of seal and to tighten the bung to the correct degree. National Pipe Thread (NPT) is recommended for creating a tight seal, as it tapers slightly, improving the seal as you tighten the plug. Using a straight thread coupling and a straight thread plug with an O-ring can also be effective.
If a leak does occur, it may be possible to repair it by using thread tape or epoxy repair systems. However, if the bunghole has been stretched or split, the bung may need to be replaced. It is also important to ensure that the correct size of the bung is used, as using the wrong size can lead to disappointment and may not create a tight seal.
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Bung adapters can save time, money and materials
Bung adapters can save time, money, and materials. Adapters can be used to connect drums with different thread types, avoiding the need to transfer materials between containers. This is especially useful when dealing with drums that have non-standard thread sizes, such as buttress threads. Buttress threads come in many different sizes, and a drum with a buttress thread can be connected to a standard American drum with a 2" NPT threaded opening using a Kowabunga Bung Adapter. This saves time and effort by eliminating the need to install a pump and pump material from one drum to another.
Additionally, bung adapters can help to avoid leaks. On PE drums, for example, the screw threads are different, and an adapter is needed to ensure a proper seal. Over-tightening a bung on a plastic drum can damage the bunghole and cause leaks, so using an adapter can help to avoid this issue. The correct choice of seal (rubber, PE, S.EPDM, etc.) depends on the nature of the drum contents, and adapters can facilitate the use of the appropriate seal.
Bung adapters are available for a wide range of drum types and sizes, including plastic (PE, HDPE, and PP) and metal (steel) pails from 1 to 7 gallons, as well as larger drums and totes. Adapters can accommodate various thread sizes, such as 2" and 3/4" buttress threads, 2" and 3/4" NPT threads, and more. It is important to determine the correct adapter for your specific drum and packaging environment, taking into account factors such as temperature, pressure, and chemical composition.
By using bung adapters, you can streamline your processes, reduce waste, and improve the efficiency of your operations. Adapters provide flexibility and compatibility, ensuring that you can work with a variety of drum types without the need for costly and time-consuming modifications. With a range of adapter options available, you can find the right solution to meet your specific requirements.
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Bung caps with knockouts are versatile and compatible with most US-made drums
Bung caps with knockouts are a versatile option for sealing drums. They are compatible with most US-made drums, including 15g, 30g, and 55g drums, and can be used for emergency storage and transport. These bung caps are designed to withstand high resistance to heat and severe weather conditions, ensuring a long life and reduced labour and material costs. They are also certified for use in UN-certified drums, providing a guarantee of quality and no leakage.
When purchasing bung caps with knockouts, it is important to consider the thread type and size to ensure a proper fit. Bung caps typically come in two thread types: fine and coarse. It is crucial to know which type of thread is required for your drum, as using the wrong thread can lead to disappointment and leakage issues. Over-tightening a bung on a plastic drum can damage the bunghole and hinder the fitting of the capseal, resulting in leaks. Therefore, always comply with the recommended tightening torque to avoid any issues.
To determine the correct bung size for a plastic drum, you should consider the drum's capacity and the specific thread type required. The most common bung caps have a 2-inch diameter and are compatible with 55-gallon drums. However, some drums may require a different size, such as a 3/4-inch bung cap. It is also important to distinguish between buttress threads and National Pipe Straight (NPS) threads, as they are not interchangeable. Buttress threads are commonly used in North America, with the 63mm size being the most prevalent in the chemical drum industry.
Additionally, when purchasing bung caps with knockouts, it is advisable to opt for a reputable brand or supplier. This ensures that you receive a quality product that meets the required standards and specifications. By considering the thread type, size, and sourcing from a reliable supplier, you can effectively determine the appropriate bung size and type for your plastic drum, ensuring a secure and leak-proof seal.
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Buttress threads are available in different sizes and vary by manufacturer
Buttress threads are a type of screw thread with an asymmetric shape, having one square face and one slanted face. They are commonly used in applications where the load is applied in a single direction, such as leadscrews, artillery construction, and vises. Buttress threads are available in various sizes, and the specific size used can vary depending on the manufacturer and the application.
In the context of plastic drum bung sizes, buttress threads are commonly used, and the size can vary depending on the manufacturer and the specific type of drum. For example, in the chemical drum industry in North America, the most common size is 63 mm, which is sometimes referred to as a "2-inch Buttress," although this is not entirely accurate. This size is often used as the secondary bung on standard drums, which typically have two different openings or bungs.
It's important to note that the thread size of buttress plugs can vary, and they may be labelled with a metric size, such as 63 mm, or with a nominal size, such as 2 inches. The specific thread pitch and depth can also vary among manufacturers, so it's important to ensure compatibility when replacing bungs or using adapters.
When dealing with plastic drums, it is crucial to use the correct bung and seal to avoid leaks. Over-tightening a bung on a plastic drum can damage the bunghole and hinder the fitting of a tamper-evident capseal. Therefore, it is essential to follow the recommended tightening torque and choose the appropriate seal material, such as rubber, PE, or S.EPDM, depending on the contents of the drum.
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Frequently asked questions
A drum bung is a plug used to seal the opening of a drum.
Buttress threads are coarser than NPT threads and will not get stripped. NPT threads are tapered and require an O-ring to create a liquid-tight seal.
The standard bung size for a plastic drum is 2 inches or 55 mm.
A drum adapter eliminates the need to pump material from a drum with a buttress thread opening to a standard American drum with an NPT threaded opening, saving time, materials, and money.
To seal a plastic drum bung, you need to use a tamper-evident capseal, either metal or plastic. It is important to comply with the recommended tightening torque to avoid leaks and damage to the bunghole.
