Rotalock
Innovative Design Features
While our Bandlock™ 2 is the benchmark design for global
high-pressure applications, GD Rotalock™ has been developed
to provide an inherently safe, low cost solution for small diameter,
low pressure applications. Designed and priced to offer a superior alternative
to screwed closures and blind flanges, Rotalock™ handles lower pressures
to ANSI 300 and diameters from 4" to 14". It provides quick and frequent
access to a range of vessels in petrochemical, pharmaceutical and chemical
process technologies, at temperatures from -30°C
to +200°C.
Typical applications include:
- Filters
- Separators
- Meter Provers
- Pig/Scraper Traps
- Blowdowns
- Strainers
- Coalescers
- Waste Disposal vessels
Pressure Warning Screw (PWS)
A key feature of our Rotalock™ design
is the Pressure Warning Screw incorporating
an integral screw which penetrates
through
both locking elements in the hub and the cap. When the PWS
is unscrewed it will warn the operator
of internal vessel pressure
before the cap is rotated. Complete withdrawal of the PWS
and integral locking pin is required
before the cap can be rotated
and the closure opened.
The PWS is fitted to all sizes but is not designed to function
as a blowdown valve.
Field Weldable Hubs
The Rotalock™ Closure Hub is SA350-LF2 forged carbon steel
and no special field welding techniques or procedures are
required. Connecting thickness is for standard wall in accordance
with
BSI600/API. Terminations to match thin wall or extra strong
pipe are available at extra cost.
Durable Seal
The fully moulded lip seal is available in Nitrile (NBR)
and fluorelastomer material (Viton). It is located in the
cap to
prevent operational damage. The use of a lip design prevents
metal-to-metal
binding which is often experienced when using 'O' rings in
quick-opening threaded closures.
Easy Operation
The PWS with its integral locking pin is unscrewed and completely
removed. This enables the cap to be partially rotated which
separates the seal surfaces giving the operator a secondary
warning if pressure is still present in the vessel. A further
turn of the cap allows it to be withdrawn from the hub and
swung fully
clear using the hinge or davit.
The whole operation can be carried out by one person without
the need for special tools or wrenches. Total closing of
the cap is also guaranteed since the locking mechanism must
be fully
engaged before the integral pin is relocated and this enables
the PWS to be finally screwed into its seating.
Secure Cap
Manufactured in cast carbon steel SA352-LCB material. The
head is drilled with a M16 metric thread into which the PWS
is located.
The exposed hole is considerably larger than that provided
on other designs to ensure that the risk of blockage is minimised.
Dual Hinging
All of our standard horizontal closures have jib arms which
allow the cap to swing to either side after opening to give
greater
installation flexibility. Vertical opening uses a screwed
davit to lift the cap clear of the hub.
Code Compliance
The Rotalock™ Closure is designed in accordance with
ASME VIII Div. 1. 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.
CE Marking for European applications is available as an option.
All product wetted pressure retaining materials conform to
NACE Standard MR-01-75.
Hydrotest
Rotalock™ Closures can be hydrotested as an option.
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