How is the Lid on an Open-Head Drum Fastened?
When it comes to transporting and storing hazardous or non-hazardous fluids, one of the most common containers used in various industries, such as chemicals, pharmaceuticals, and food and beverage, is an open-head drum.
Unlike a closed-head drum, which has a solid top that is typically permanently welded or crimped onto the drum body, an open-head drum has a removable lid or cover that allows for easy access and efficient filling or emptying of the contents.
But how is the lid on an open-head drum fastened to ensure proper sealing and prevent any leaks or spills during transport or storage? Let's take a closer look at some of the common methods and devices used.
1. Lever Lock Ring
One of the most common ways to secure the lid on an open-head drum is by using a lever lock ring. This device consists of a metal band that wraps around the circumference of the drum and a lever mechanism that tightens or releases the band.
To fasten the lid, you simply place it on top of the drum and align the flange or bead around the lid with the groove or channel on the drum body. Then, you slide the lever lock ring over the lid and drum and engage the lever to tighten the band until it securely clamps the lid into place.
To remove the lid, you reverse the process by disengaging the lever and sliding the ring off the drum. Some lever lock rings also have a safety latch or catch that prevents accidental release or loosening of the device.
2. Bolt Ring Closure
Another type of fastening device for open-head drum lids is the bolt ring closure. This method uses a series of bolts or screws, usually four to six, that thread through the flange on the lid and into the corresponding threaded holes on the drum body.
To seal and secure the lid, you place it on top of the drum, align the holes, and insert the bolts or screws. Then, you tighten them in a crisscross pattern until they are snug and the lid is evenly pressed against the drum body.
To remove the lid, you simply loosen and remove the bolts or screws in a reverse crisscross pattern. Some bolt ring closures also feature a gasket or seal that enhances the tightness and leak resistance of the closure.
3. Snap Ring
A snap ring is a type of fastening device that uses a spring-loaded clip or ring to secure the lid onto the drum body. This method is often used for smaller open-head drums, such as those with a capacity of 5 to 20 gallons.
To fasten the lid, you place it on top of the drum, align the flange or bead with the groove or channel, and press down with moderate force until you hear or feel the snap ring engage. To remove the lid, you lift the ring and pull the lid off.
4. Bung Closure
In addition to the main lid, an open-head drum also has one or more openings or bungs on the top or side of the drum that allow for filling, pouring, or venting. These bungs typically have their own closures or plugs that also need to be fastened securely.
One common type of bung closure is a screw cap, which threads onto the bung and seals it tightly. Another type is a flanged cap, which fits over the bung and snaps onto the flange on the drum body. Some bung closures also have a gasket or seal to ensure proper sealing.
5. Tab Closure
A tab closure is a simple and easy-to-use fastening device that consists of a metal tab or plate that snaps over the lid and drum flange or bead. This method is often used for lightweight or disposable open-head drums, such as those made of plastic or fiber, and for non-hazardous or low-viscosity liquids.
To fasten the lid, you place it on top of the drum and align the flange or bead with the groove or channel. Then, you snap the tab over the lid and flange until it clicks or locks into place. To remove the lid, you simply lift the tab and pull the lid off.
In conclusion, the lid on an open-head drum can be fastened in various ways depending on the size, material, contents, and application of the drum. By understanding and using the appropriate fastening devices and methods, you can ensure the safe and effective handling, transportation, and storage of your products..