Bandlock 2
Innovative Design Features
GD Engineering is a world leader in the manufacture of quick opening closures.
Our
GD Bandlock™ 2 is the
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 pipeline pig traps, filters, coalescers, strainers, separators,
meter skid systems, hydrocyclones or any pressure vessel in
seconds.
Compared with other quickopening 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.
Computeraided technology has played a large part in the design of Bandlock™ 2.
For instance, 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. This transmits loads uniformly around the full
360° circumference
of the hub.
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.
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.
Seal Material
The standard seal is Nitrile with shore hardness of 75°. Viton,
HNBR and explosive decompression-resistant Fluoroelastomer
materials 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.
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
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 Authorised Inspector.
Size and Pressure Range
Bandlock™ 2 is available to suit differing vessel sizes and pressures
from 6 inch to 100 inch diameters with hub sized for welding to
any diameter and thickness, for any pressure from ANSI
Class 150 up to Class 2500 (425 bar working pressure).
Materials
Forged steel hubs with forged or plate doors can be supplied
to meet all international material specifications. All product
wetted pressure retaining materials conform to NACE Standard
MR-01-75.
Finish
Supplied with a single application of anticorrosive primer.
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