GD Engineering

BandLock 2 Closures

BandlockTM 2

high pressure quick-opening closure

Integral Safety Devices

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 complete safety, the locking band can be seen at all times, which satisfies design code requirements and means that the operator can actually see that the door is securely closed and locked.

Unique Seal

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 area 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.

Door Hinging

For horizontal use the door is double pivoted on hinges with self-lubricating bearings. The bolted fitment allows adjustment for wear and can be specified for right or left swing.

Vertical installation includes a davit which enables the Bandlock™ 2 door to be lifted and swung clear of the hub. At diameters over 30″, lifting eyebolts are normally fitted instead of the davit, so that the door can be lifted out of the way.

 

Innovative Design Features

GD Engineering is a world leader in the manufacture of quick opening closures. Our GD Bandlock™ 2 is the original and benchmark design for global high-pressure applications with over 20,000 units in operation worldwide.

GD Bandlock™ 2 Closures provide horizontal or vertical access to any pressure vessel in seconds. Compared with other quick-opening closures they 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.

Computer-aided technology has played a large part in the design of Bandlock™ 2. The main pressure-loaded sections have been designed to save weight by employing finite element analytical techniques and proof testing by strain gauges, while still adhering to primary pressure vessel code requirements.

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, transmitting the pressure load uniformily around the full 360° circumference of the hub.

Typical applications include:

  • Pipeline pig traps
  • Filters
  • Coalescers
  • Strainers
  • Separators
  • Meter skid systems
  • Hydrocyclones

Attachments:
Bandlock

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