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When it comes to know-how, experience and product range within the field of closures, pig signallers and multiple pig launchers, you won't find a better business partner than SPX. Years of intensive product development have enabled us to offer you a range of products to match the exacting requirements within industries such as oil and gas where our products are integral to the pipeline systems used.

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.

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.

Seal Material

The standard seal is 80° shore hardness Nitrile material. Viton, HNBR and explosive decompression-resistant materials grades are also available. Temperature range is -45°C to +210°C according to the elastomer specified.

Hydrostatic Testing

Normally carried out as part of the final vessel test but an individual closure hydrotest can be provided as an option.
Unique Seal with Integral Anti-Extrusion Spring

To give a completely pressure-tight seal, the purpose designed servo acting lip seal energizes at zero pressure. For both Horizontal and Vertical Installations the seal is housed in the door away from the working area for protection and long life, and is easily fitted without tools. The one-piece molding is available in a range of elastomers and incorporates a stainless steel spring to prevent extrusion and provide a full vacuum capability.


Forged steel hubs with forged or plate doors can be supplied to meet all international material specifications. NACE Standard MR-01-75 / ISO 15156 materials are available.

Approved Design

Standard units meet ASME VIII Div.1. The requirement of other pressure vessel codes, such as ASME VIII Div. 2 and PD5500 can be accommodated. ASME Code Stamp with U-2A partial data report can be furnished as an option. Code stamping verifies shop inspection of the closure and materials by an ASME Authorized Inspector.

European Pressure Equipment Directive (97/23/EC)

The following options are available: Technical file — submitted to vessel fabricator for incorporation into CE Marking of vessel

CE Marking of Closure by GD Engineering

Applications Typical quick opening closure applications include:

  • Pipeline pig traps
  • Filters
  • Coalescers
  • Strainers
  • Separators
  • Meter skid systems
  • Hydrocyclones
  • Bandlock Pipeline End Closures
  • Pig Alerts
  • Pig Launching Systems
  • Special Closure Applications
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