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This document contains a total of 7 pages,
Including the cover page. The contents are not
To be disclosed to any unauthorised person
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7. Priority : Operational
8. Number of Pages : 07
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9. Purpose.
(a) The requirement of Surface Demand Diving Equipment (SDDE) is to enable a diver
to breath underwater using this set to a depth of 55 meters. The equipment is required
for undertaking a diving operation in water/ sea and to assist the diver to undertake the
task in a safe and hazard-free manner.
(b) The SDDE set provides adequate safety inbuilt safety of:-
10. Regulation/ Standards. The Diving Equipment should comply with the following
current International Standards: -
(b) Certification as per ISI/ ISO/ Lloyds/ EN250/ DNV or equivalent Standards for HP
cylinders, rubberised HP/ LP pipes, Buoyancy Jacket and other materials.
11. Functionality. The equipment should be capable of being used by any diver
underwater during a diving operation and free swimming. The role of each item should be as
per characteristics enumerated along with the description/ main features.
PART II
12. Introduction. Surface Demand Diving Equipment (SDDE) is used for a diving
operation when a diver is required to dive for a prolonged time and to deeper depths. This
equipment is self-sufficient to support any diving operation for two divers. The equipment
comprise of the following sub-assemblies: -
(c) Diving Umbilical of 120 mtrs length with two joint attachment on a Reel for
stowage/ operation - 02
(d) Storage Cylinders of not less than 30 lts capacity with connecting hose - 06
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(a) Divers Harness. The two Breathing apparatus consisting of the following: -
(i) Full Facemask. The facemask should be with breathing valve assembly
and have a positive pressure inside. The mask should have provision to integrate
with ‘Divers Underwater Communication System’ (DUCS as well as WUCS) and
should fit on the divers face without any ingress of water. The straps should hold
the mask in place even in strong current 2 – 3 knots.
(ii) Cylinder Pack assembly. Compressed air cylinder pack with neck
fitting of control valve should be provided.
(iii) Harness. The Harness basic structure should be comfortable to wear and
should have provision for mounting air cylinders and other accessories fitted.
Harness to have adjustable so as to make a snug fit and ensure hands free
movement.
(vi) Tool Kit. The diving set test and tool kit for the periodical maintenance
and testing of the Divers Harness.
(b) Surface Control Panel. The Control panel should support two divers with the
following: -
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(iii) Inlet Pressure. Pressure gauge indicating pressure of air storage bank
and secondary pressure of air supplied to the diver.The minimum air pressure
on the surface should be marked in Red colour.
(iv) Air Inlet Connections. It should have required adaptors to connect two
HP pipes (connected to Cylinders/ Air Filters).
(c) Umbilical. The umbilical comprise of three hoses that connect the Divers Harness
to the Surface Control Panel should be properly rolled on a Reel. A Diver underwater is
provided following through these hoses: -
(i) Air hose to supply LP breathing air from the surface to the Divers.
(d) Storage Cylinder with HP Pipe. The Storage cylinders are required for
surface use only to provide air storage bank for the SDDE equipment. Each cylinder
should have a minimum capacity of not less than 30 lts with a working pressure of 200
bars. The material of the cylinder can be Non-corrosive Stainless Steel/ Aluminium/ light
metal alloy. These cylinders should be connected with HP hose to supply air to the
Control Panel. These HP pipes should have a life of minimum 10 yrs with Test pressure of
300 bars.
(f) Stowage Container The breathing harness and panel should be supplied
with a weather proof transportable container that has towing wheels at the bottom for
easy shifting on surface.
14. Control Panel. The control panel should display/ meet following requirements: -
(b) Independent pressure gauges and depth indication for each diver
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(c) HP 300 bar Regulators capable of delivering air at maximum depth to the divers
(d) The apparatus should be rugged, lightweight suitable for carrying by a single
person.
(g) Should have an independent power source with commercially available batteries.
(a) Independent umbilical for each diver capable of supporting diving to depth of
55 metres.
(b) Should have connectors for the control panel and breathing apparatus of non-
corrosive material.
(d) Should have sufficient strength to enable emergency hoisting of diver using the
umbilical.
(e) Should incorporate an arrangement of attaching the umbilical to the diver’s belt /
diving set to release strain on the same at the diver’s end.
17. Environmental Conditions. The entire equipment should be suited for tropical
conditions and not require any environment control for stowage.
(b) Should include a computer based training package for routine maintenance and
repair of the equipment.
(c) The life of all consumable subassemblies and spares to be stipulated in the
documentation
(d) Paper particular, company Part numbers with description and layout drawing of all
components of the equipment is to be provided.
(a) On Board Maintenance. All the items should afford easy on-board maintenance,
by replacement of consumable spare parts or by way of replacement with new items.
The supplier/ OEM is required to recommend a list of onboard spares along with Part
numbers. The equipment should be supplied along with special tool kit and test
equipment as required for the same.
(b) Base and Depot Spares/ Stocking. Manufacturers Recommended List (MRL)
for Base and Depot (B & D) spares and On Board Spares (OBS) must be provided with
cost. Adequacy and continued availability of spares/ replacement of the item (depending
upon the life span) must be ensured prior to placement of orders for these diving
equipment.
(d) Product Support. The OEM/ supplier should support each item of the equipment
supplied, for a period of its life span. Any obsolescence of the component/ spare/ item
needs to be intimated by the firm, well in time, to enable stocking of spares by the
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Indian Navy. The firm should also recommend/ offer suitable substitutes/ replacement
for such components. In addition, up-gradation/ modification to the equipment, resulting
in enhancement in the performance should be intimated and offered to the Indian Navy.
The firm should also indicate their willingness to undertake AMC/ periodic maintenance
(which would be separate contract on expiry of the warranty period) either directly or
through their authorised Reps in India.
20. Testing Procedures. The equipment should adhere to the environmental test
conditions & proof there of as per International standards.
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