GD Bandlock 2 is the original benchmark design for global high-pressure applications providing horizontal or vertical access to pipeline pig traps, filters, coalescers, strainers, separators, meter skid systems, hydrocyclones or any pressure vessel in seconds.
Compared with other quick-opening closures Bandlock 2 can be operated safely at remarkable speed – any size of unit can be opened or closed in less than a minute, with no special tools required.
The main pressure-loaded sections are designed to save weight by employing finite element analytical techniques and proof testing by strain gauges.
The tried and tested locking band mechanism, which gives the range its name, is a duplex stainless steel conical thrust ring fitted between the door and hub. This transmits loads uniformly around the full 360 deg circumference of the hub.
Safety has been engineered into the Bandlock 2 at every stage of its design and manufacture.
A hand-operated pressure warning screw integrated into the mechanism prevents the door being unlocked until it is confirmed that the vessel’s internal pressure has been relieved.
Additional secondary safety features, such as mechanical key interlocks, can be fitted and integrated with control valve operations.
For horizontal use the door is double pivoted on hinges with self-lubricating bearings.
Vertical installation includes a davit, which enables the Bandlock 2 door to be lifted and swung clear of the hub.
At diameters over 30ins, lifting eyebolts are normally fitted instead of the davit, so that the door can be lifted out of the way.
To give a completely pressure-tight seal, the purpose-designed servo acting lip seal energises at zero pressure.
It is housed in the door face away from the working are for protection and long life, and is easily fitted without tools.
The one-piece moulding is available in a range of elastomers and incorporates a stainless steel spring to prevent extrusion and provide a full vacuum capability.
Standard units meet ASME VIII Div 1 and other pressure vessel codes, such as ASME VIII Div. 2 and PD5500. ASME Code Stamp with U-2A partial data report can be furnished as an option.
