SPX FLOW's GD Engineering brand has a long and successful history with the petrochemical and oil and gas industries. The Bandlock 2 closure is the original and benchmark design for high pressure closures. It ensures inside pressure cannot open the closure and has been proven to provide a safe, easy to use access solution with over 20,000 units in operation worldwide. Used in horizontal, vertical, inclined or declined installations for pipeline pig traps, filters, coalescers, strainers, separators, meter skid systems, hydrocyclones or any pressure vessel, even the largest of these closures can be opened in under one minute without the need for any special tools.
Computer-aided technology has played a large part in the design of the Bandlock 2 closure. Although robustly designed to primary pressure vessel code requirements, main pressure loaded sections have been engineered to save weight by employing finite element analytical techniques and proof tested by strain gauges.
The fail-safe door uses a locking band mechanism which comprises a duplex stainless steel conical thrust ring fitted between the door and hub. It transmits the pressure load uniformly around the full 360° circumference of the hub and, even in the locked position, is always in compression and visible to the operator. Its unique self-energizing fully moulded lip seal energizes at zero pressure to give a completely pressure-tight seal and full vacuum capability. A double acting hinge mechanism further allows the door to be swung through 270° to ensure easy access.
Bandlock 2 closures can be manufactured in sizes up to 90", or larger depending on flow conditions. They are also available in sizes up to 50" with flange connections for easy replacement of blind flanges. A wide range of standard configurations and options are complemented by the ability to customize the closure to exact application requirements.