Description

Description of Bandlock

EMT is a globally recognized leader in the production of quick-opening closures. Our EMT Bandlock sets the standard in high-pressure application closures, with over 20,000 units in operation worldwide.

EMT Bandlock Closures provide rapid, horizontal, or vertical access to any pressure vessel. Unlike other quick-opening closures, they can be operated safely at an exceptional speed—any size of unit can be opened or closed in less than a minute, with no special tools needed.

Computer-aided technology has greatly contributed to the design of Bandlock. The main pressure-loaded sections have been designed to save weight, utilizing finite element analytical techniques and proof testing by strain gauges, all while adhering to primary pressure vessel code requirements.

The dependable locking band system, from which the product derives its name, features a conical thrust ring made of duplex stainless steel. Positioned between the door and hub, it evenly distributes the pressure load across the entire 360° perimeter of the hub.

Features of Bandlock

BUILT-IN SAFETY FEATURES
The EMT Bandlock is characterized by its safety features, incorporated throughout its design and production process. It includes a manually operated pressure warning screw within the mechanism, ensuring the door cannot be unlocked until the pressure inside the vessel is confirmed to have been released. Additional safety enhancements, like mechanical key interlocks, can be added and connected with control valve operations. For total safety assurance, the locking band is always visible, complying with design code mandates and enabling the operator to visually verify that the door is securely locked and closed.

DOOR PIVOTING
The door is designed to pivot twice on hinges equipped with self-lubricating bearings for horizontal application. The bolted placement allows for wear adjustment and can be configured for either right or left swing. For vertical installation, a davit is included which allows the EMT Bandlock door to be lifted and moved away from the hub. When diameters exceed 30″, lifting eyebolts are typically used in place of the davit, permitting the door to be lifted aside.

SEAL COMPOSITION
The default seal is made of Nitrile material with a shore hardness of 80°. Alternatives like Viton, HNBR, and materials resistant to explosive decompression are available as well. The temperature compatibility ranges from -45°C to +210°C depending on the specified elastomer.

HYDROSTATIC EXAMINATION
While typically part of the final vessel inspection, an individual closure hydrostatic test can be optionally conducted.

DISTINCTIVE SEAL WITH EMBEDDED ANTI-EXTRUSION SPRING
The specially designed servo-acting lip seal creates a completely airtight seal, activating at zero pressure. In both Horizontal and Vertical Installations, the seal is placed in the door, away from the operational area for protection and longevity, and can be easily installed without tools. The one-piece mold is offered in various elastomers and includes a stainless steel spring to combat extrusion and support full vacuum capability.

CONSTRUCTION MATERIALS
Hubs made from forged steel, with doors of forged or plate steel, can be supplied to meet all global material specifications. Materials complying with NACE Standard MR-01-75 / ISO 15156 are also available.

Key Features of Bandlock

1. Rapid Access: Bandlock allows for swift access to pressure vessels, improving maintenance efficiency and reducing downtime.
2. Horizontal or Vertical Operation: It is versatile and can be operated both horizontally and vertically, making it suitable for various applications.
3. Scalability: GD Engineering’s Bandlock design can be upscaled to accommodate very large diameter closures for different industrial needs.
4. Enhanced Safety: Quick-opening closures like Bandlock are designed with safety in mind, ensuring that access to pressure vessels is secure and controlled.

Applications of Bandlock

Quick-opening blind plates are widely used in various fields such as natural gas, chemical, metallurgy, and others in equipment such as filters, tanks, filter separators, metering skids, cyclone separators, heat exchangers, and more. These are horizontal and vertical pressure vessel devices that operate under high pressure, have a large volume, and require periodic opening and closing. The applicable mediums are oil, gas, water, and non-corrosive chemical raw materials (strongly corrosive mediums should use other materials such as stainless steel for processing). The applicable temperature range is -40℃ to 100℃.