The valves on the
side of the ship / Ship-side valves on the top refer to valves that
are connected to the hull, without having anything to medium with the
valve on the side of the ship. During the dry dock, the valves are
checked by the dry dock personnel, while the work of the ship's
engineers is to check the internal valves. For total seaworthiness of
the ship, the ship side valves must always be in proper condition,
They must have local as well as remote control operation which must
be permanently connected. Pipes of the inlet and the outlet to the
sea must be provided with valves or taps attached directly to the
outer coating or to the plating’s of fabricated water boxes
attached to the shell plating. These accessories must be fixed with
threaded bolts equipped with hazelnuts.
Heads or bolts
screwed into heavy steel pads built into the plating. Screw holes
must not penetrate into the plating. Valves for the Ship side Side
Applications must be installed so that the pipe section can be
located directly inside the valve without removing the sealed
integrity of the hull. Taps and accessories of the ship, when made of
steel or other approved material with low resistance to corrosion,
must be adequately protected against wastage/rusting. In the visual
inspection, the valves should not show any sign of defects on their
body, their internals and the spindle. The Thread and other parts
must be in good condition, which ensures freedom of movement in the
operating conditions. Ship side valves are made and tested in
accordance with the rules and regulations of the classification
society in the presence of an expert.
Markings on the Ship
Side valve of the Ship: The following data are marked on each side of
the valve.
a) Nominal size of
the drill (eg NB 80);
(b)Nominal pressure
according to section 1.4.
c) Test pressure
d) Brand / seal of
the manufacturer.
e) Marker / Stamp of
Classification Surveyor.
f) Flow direction
g) The weight of the
valve to be marked.
h) Metallic tag
numbers provided with the table.
Why are they so important?
In a Ship, all that
has been installed has a purpose, besides the valves on the side of
the ship is controlled and supervised by the classification society.
Maritime organizations (classification society and flag state) know a
series of incidents of local flooding machinery space installations
and averaging two reports of floods received annually. The side flaps
ensure the sealed integrity of the shell and the internal working sea
tube from the sea. Operation of the valves allows maintenance of
pipeline equipment. They are used to prevent the ingress of water
into the compartments after a failure in a pipeline or equipment.
Therefore, the valves must provide a watertight barrier when closed.
In normal commercial vessels, the ship is docked dry and the ship's
valves are inspected to meet classification society standards. This
inspection confirms the condition of the valve and closes it when
closed. For installations, such as mobile drilling units of fleets or
ships of intervention, the inspection may be performed by dry dock
times or repair in the port, however, permanently anchored facilities
these inspections are carried out. They become more complicated as
the right holder must be able to demonstrate that the valve is
sufficiently leak-proof and in good condition. This can be combined by
a close visual inspection and on-site testing. After repairing or
installing a new valve, the dry dock repair shop usually provides a
5-year warranty on these valves. However, if the valves are damaged
during the warranty period, the workshop will bear the cost of the
diver's time and expenses.
Listed below are few Ship-side valves that is seen on vessels.
Name of the Valve Side Type Specification
1 Sea water suction for low sea chest Starboard Butterfly valve 10K 550A
2 Sea water suction for high sea chest Port Butterfly valve 10K 550A
3 Sea water suction F.W.G sea chest Starboard Butterfly valve 10K 125A
4 Main cooling S.W discharge overboard Port Butterfly valve 10K 300A
5 O.W.S discharge overboard Port SDNR 10K 40A
6 Fire & G.S pump discharge overboard Starboard SDNR 10K 200A
(fire and ballast pump) (Screw Down Non-Return valve)
7 Steam blow valve to high sea chest Port SDNR 16K 40A
7a Air vent for high sea chest Port Ordinary Globe valve(SDGV) 10K 40A
8 Steam blow valve to low sea chest Starboard SDNR 16K 40A
8a Air vent for low sea chest Starboard SDGV 10K 40A
9 Steam blow valve F.W.G sea chest Starboard SDNR 16K 40A
9a Air vent for F.W.G sea chest Starboard SDGV 10K 40A
10 F.W.G discharge overboard Port Butterfly valve 10K 125A
11 Boiler blow down direct overboard Port SDNR 16K 40A
12 Soil/waste water discharge overboard Starboard Storm valve 10K 100A
13 Stop valve for waste water overboard Port Storm valve 10K 100A
14 Gally/provision refer drain overboard Starboard Storm valve 10K 100A
15 I.G system scrubber cooling tower Starboard Butterfly valve 10K 200A
discharge overboard
16 Draught gauge overboard valve Starboard SDGV 10K 50A
17 Weather deck scupper overboard Port 125A
18 Weather deck scupper overboard Starboard 125A
19 Main water ballast pump discharge overboard Port Butterfly valve 10K 550A
20 ODME discharge overboard Starboard Butterfly valve 10K 350A
What does K and A stand for in specifications?
K : is the pressure.
A : is the Nominal diameter of the pipeline.
*Note: The Following Article is being Originally written by one of our co-Author (Arpit Singh) on his personal website and is being re-used with proper modifications, editing and due permission. If you have any problem with any part of the content please contact us, We will act ASAP.
Author ARPIT SINGH and Amit
Posts
1 comments:
Your blog is very informative and useful. Thanks for sharing this information with us.
ReplyMarine Swim Platform Pad
Post a Comment