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Zero man entry for tank cleaning
operations is rapidly becoming standard practice in all European and
many other Countries.
NESL have developed the Manway
Cannon system for zero entry cleaning operations.
The latest generation Manway
Cannon have increased capabilities and facilities.
The systems are ATEX certified
and are supplied with gas detection and jetting supply pumps.
The Cannons
are constructed from Stainless Steel and are protected against oil and
chemical attack.
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The Complete cannon system is installed in a
specially modified standard ISO 20Ft shipping container. The container
is fully certified by Lloyds Container Services for shipping by sea.
The container is separated into 3 compartments. The control room
is fully lined and insulated and comes with heating and air conditioning
for operator comfort. The centre compartment houses the hydraulic power
pack, umbilical and reel and also the manway cannons. The third
compartment is a fully acoustic lined generator room. As well as the
generator there is also space for the centrifugal pump to be stored for
shipping and transportation.
Operator
comfort and an office like work area was not one of our first
considerations when designing the system, but with customer feedback
indicating that refinery senior management are arriving at every site to
see the cannon, it was deemed
the
way forward |
The incorporation of the Xenon spotlight into the
cannon system has resulted not only in more efficient and cost effective
cleaning times, but more & more refineries and tank farms are now
employing the services of the cannon for internal visual inspections of
tanks for damage and content clarification.
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Viton Sleeving protects hoses and cables from
damage. Viton seals protect electrical equipment from chemical attack |
The range of movement on the cannons, as shown in
the pictures, allows cleaning operations to be carried out not only at
great distance but also close to the manway. With the ability to point
in the air, tank roof washing at the initial stages of operation saves
time later in the process. |
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The centrifugal pump is a stand alone unit which is
located close to the tank for operation. It is fully certified for use
in a zone 1 environment.
It has the capability to be hooked up to 2 cannons
at the same time, although operation of 2 cannons together is not
normally advised.
Both local
and remote operation of the pump is
possible |
The control room has a checker plate stainless
steel floor, is fully insulated and panel lined and comes complete with
heating and air-conditioning system and lighting. The operator console
is designed for maximum ease of use. The cannon is controlled manually
via joystick’s for movement and switches for functions or automatically
via the integrated touch screen, real time cannon graphical indication
display. All operations can be recorder direct to HDD DVD recorders and
the tank is constantly monitored via a gas
detection system which will shut the system down should set
levels of LEL be reached.
The computer is protected by a UPS in case of power failure
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Umbilical storage is made easy using the twin
stacking hydraulically driven reels. By means of a simple switch
operation the reel will either rotate clockwise or counter clockwise.
The units are available without the hydraulic drive
but due to the weight of the laden reels we advise against this.
Operators
are protected from the chain drives by a stainless steel guard complete
with E-stop in the case of emergency |
