Parker launches innovative manifold at Offshore Europe
Posted: 2 September 2003
One-piece double-block-and-bleed manifold optimises the
size, weight and integrity of process instrumentation. Design reduces
size, and potential leak paths
Parker Instrumentation launched a range of one-piece double-block-and-bleed
manifolds that significantly reduces the size and weight of process
monitoring instrumentation installations.
Machined from a single steel forging, Parker's new manifold design
eliminates numerous joints - and potential leak paths - compared
with arrangements constructed using discrete components. Incorporating
flange interfacing, the new products connect easily to process piping.
Called Pro-Bloc, the design is offered in a range of configurations
and choices to provide optimal solutions for wide-ranging instrumentation
requirements. Applications include instruments for offshore oil
and gas platforms, petrochemical and chemical plants, and the provision
of chemical injection and sampling points in process lines.
With Parker's new Pro-Bloc range, users have a choice of two basic
body styles: with a flange connection to the process piping on one
end and an NPT thread connection for the instrument on the other;
or as a flange-to-flange design.
Users may also choose from six different flow arrangements, and
specify valve types - choosing from ball, needle or OS&Y (outside
screw and yoke) styles of valve for secondary isolation and venting.
The primary isolation function is provided by Parker's brand-new
Hi-Pro ball valve.
This high-integrity design works on the floating ball principle,
has dynamic response seats and an anti blow-out stem, and offers
and 100 per cent bubble tight operation.
As standard, the manifold is fabricated from stainless steel, carbon
steel, or duplex, and meets ANSI class 2500 pressure ratings.
Each valve is fitted with an industry standard colour-coded handle:
blue for isolation valves, red for vent/bleed/drain/test.
The use of a one-piece forging substantially reduces the size of
instrument take-offs. The height of a complete double-block-and-bleed
and instrument assembly can be as small as 330 mm, depending on
the model chosen. Weight is also greatly reduced, with Pro-Bloc
weighing around 7 kg in its smallest variant. The reduction in mass
has the additional benefit of reducing the stresses from loading
and vibration, for greater in-service reliability.
To simplify installation - especially where an instrument is best
sited remotely - manifolds are optionally available with an integral
A-LOK instrumentation compression tube fitting at the instrument
interface. This completely eliminates taper threads in the manifold,
avoiding the possibility of contamination that can result from the
ingress of tape or thread sealant materials.
In addition to double-block-and-bleed arrangements for standard
process monitoring applications, Parker offers Pro-Bloc with probes,
suitable for process sampling or injection.
Further options include fabrication from exotic materials including
Super Duplex, Monel, 6Mo, Hastelloy and Incoloy 625, for applications
in harsh operating environments, and/or involving corrosive media.
Parker additionally offers variants of these manifolds without
flanges, for direct connection to piping via NPT threaded connections
- for users seeking even smaller and lighter assemblies.
For more information see http://www.parker.com/ipd.
Posted by Richard Price,
Editor Pipeline Magazine
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