Sprinkler and Water Mist Extinguishing Systems
FIRE EXTINGUISHING SYSTEMS
APPROVAL GUIDANCE & INFORMATION:
Water spray nozzles approved
under this category are intended for installation in the pump rooms of
domestic tankers in accordance with 46 CFR 34.25. The type
denotes the location and spacing of the spray nozzles in accordance
with approved drawings.
This approval category is based on testing the water spray nozzles to a
unique fire test in a 30-foot by 30-foot test room with two
that act as obstructions. Because of the limited application for
this approval category, anyone desiring an approval of water spray
nozzles in this category should first contact this office (CG-ENG-4) to
discuss the testing and approval of the system.
WATER MIST NOZZLES
APPROVAL GUIDANCE &
Water mist systems are
approved for installation on U.S. Flag ships as a substitute for
automatic sprinklers in accommodation and service areas and control
stations, and as a substitute for total flooding fixed gas systems in
machinery spaces and cargo pump rooms. The testing requirements
for the water mist equipment are contained in the following test
|Accommodation and service areas
and control stations
||IMO Res. A 800 (19)
|Machinery spaces of Category A
cargo pump rooms
|Machinery spaces of Category A
||Fixed local application
Water mist systems must be tested to the above guidelines at a Coast
Guard accepted independent testing laboratory to receive a type
approval. The IMO fire test protocols require both component testing
and fire testing of the water mist nozzles. The fire testing must
be conducted in mock-up spaces of the maximum size requested for
approval. Not all of the Coast Guard accepted laboratories have
fire testing facilities that are suitable for approvals for very large
spaces. In that case, the component testing may be done at the
accepted laboratory while the fire testing is conducted at another
facility, and the accepted laboratory participates in the planning and
conduct of the fire testing program.
Each approved system is required to have a marine design, installation,
operation and maintenance manual (DIOM) that is evaluated as part of
the type approval. The manual must include as a minimum:
A detailed technical description of
A description of the allowable types
of hazards that can be protected by the system.
System design limitations and
dimensioning criteria, such as the maximum area that can be protected,
nozzle spacing, maximum ceiling height, minimum required water
Detailed description and drawing of
each system component, including material specifications and
A typical marine system design and
layout along with supporting design calculations.
Engineering data, such as hydraulic
flow / pressure curves, friction loss in fittings, etc.
Required types of piping and fittings
that must be used on vessels, including approved details for the
shipyard installation of piping and fittings.
Installation, operation, testing,
maintenance, and recharge instructions.
Piping flushing and hydrostatic
Description of system interface with electrical components
such as tamper switches and water flow alarms.
The system manual should contain complete information on the design and
installation of the system for the equipment as-tested. The
system water supply pumps, controls valves and pressure vessels may be
included in the laboratory testing program; alternatively, the
components should be recognized by a classification society as meeting
U.S. Coast Guard Marine Engineering regulations. The manual
should also include drawings of key components such as nozzles, valves,
filters, strainers, etc. A sample design for each application
should be included that allows an understanding of the dimensioning
requirements and nozzle spacing for each type of protected space.
Underwriters Laboratories Inc., Factory
Mutual, and Underwriters Laboratories of Canada are recognized as
independent testing laboratories for type approval testing of water
submit the following information in the Submittal Package:
- A letter requesting Coast Guard Type Approval of the equipment.
- A general description of the system and drawings of the main
- A draft marine design manual meeting the above requirements.
- Test reports from the Accepted Independent Laboratory showing
compliance with the applicable IMO component and fire testing criteria.
- Evidence that an acceptable follow-up factory inspection program
with the Accepted Independent Laboratory is in place.
Please send the Submittal Package and other related information to the
U.S. Coast Guard
2100 Second Street, S.W. Stop 7126
Washington, DC 20593-7126
Once the equipment has been approved by this office, it will
receive Coast Guard Type Approval and a Certificate of Approval
(COA). The COA will be issued for 5 years and will remain valid
during that time period if the product meets the testing of the Quality
APPROVAL GUIDANCE & INFORMATION:
Conventional sprinkler systems and related equipment required by 46 CFR
34.30, 46 CFR 76.05, 46 CFR 76.25, 46 CFR 95.30, 46 CFR 108.430, 46 CFR
116.440 (c), 46 CFR 118.400 (g), 46 CFR 181.400, SOLAS Regulations
II-2/10.6 and the FSS Code Chapter 8 do not require type approval by
the Coast Guard.
The above cited regulations require the system to be designed and
installed in compliance with the marine section of NFPA 13-1996.
the vessel is required to have a SOLAS certificate, SOLAS Regulations
II-2/10.6 and the FSS Code Chapter 8 may require specific features or
water application rates that exceed those in NFPA 13.)
Sprinkler system components approved for use in shore side buildings
have been determined acceptable for the protection of accommodation and
service spaces on ships and marine facilities without further
specialized approval testing. The standard laboratory approval testing
procedure for sprinkler heads includes adequate corrosion and vibration
Typical marine sprinkler systems consist of a sprinkler pump, a fresh
water storage tank, an air compressor or other source to pressurize the
fresh water tank, system piping and valves, alarms and automatic
sprinkler heads. The piping and fittings used in automatic sprinkler
systems are basic components that are covered by Subchapter F, Marine
Engineering. NFPA 13 requires automatic sprinkler heads and
related sprinkler system components to be tested by an independent
laboratory. The Coast Guard accepts Underwriters
Inc. (UL) listing or Factory Mutual (FM) approval of the components as
meeting this requirement.
ACCEPTABLE INDEPENDENT LABORATORIES:
Underwriters Laboratories Inc., Factory Mutual and Underwriters
Laboratories of Canada.
Questions regarding application for approval should be made directly to
Underwriters Laboratories, Inc. (UL) listing or Factory Mutual