(IV-7-3) General Safety
(IV-7-3) General Safety
(IV-7-3) General Safety
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Rules <strong>IV</strong> Industrial Services<br />
Part 7 Offshore Technology<br />
Chapter 3 <strong>General</strong> <strong>Safety</strong><br />
Section 8<br />
Active Fire Protection<br />
F.2.1 Foam generator<br />
The foam generator with tanks, pipe system, ducts, etc. is to be permanently installed and shall be capable<br />
to attain full foam production within 2 minutes after fire alarm.<br />
The foam generator with equipment is to be placed in a safe area, separated from areas to be protected.<br />
If there is no access from the open deck, two separate means of access are to be provided.<br />
F.2.2 Foam ducts<br />
The foam ducts are to be dimensioned according to the size of the foam generator outlet, and are to be<br />
so located, that an even distribution of foam is obtained throughout the room to be protected. The ducts<br />
are to be made of steel and protected against corrosion.<br />
A shut-off device is to be fitted between the foam generator and the distribution system.<br />
F.3 Low expansion foam<br />
F.3.1 Enclosed spaces<br />
If low expansion foam is used for local protection in enclosed spaces, the system is to be so designed,<br />
that the largest area over which fuel can spread, can be covered within 5 minutes with a 150 mm thick<br />
layer of foam. The expansion ratio shall not exceed 12:1.<br />
F.3.2<br />
Exterior locations<br />
F.3.2.1 Fixed low-expansion foam systems for use in exterior locations shall be capable of supplying<br />
foam solution to the monitors and foam applicators at a rate which shall be at least the greater of the following<br />
quantities, but not less than 1250 l/min:<br />
1. 0.6 l/min per square meter of the total area to be protected<br />
2. 1.5 l/min per square meter of a circular area with the radius of 75 % of the nominal length of throw of<br />
the largest monitor provided.<br />
F.3.2.2 Foam capacity<br />
The supply of foam concentrate is to be sufficient for at least 30 minutes of operation of the system at<br />
maximum capacity as specified in F.3.2.1.<br />
F.3.2.3 Foam monitors<br />
Foam monitors are to be so arranged that the protected area can be covered from at least two monitors,<br />
which shall as far as practicable be located opposite to each other.<br />
F.3.3 Foam hydrants<br />
Foam hydrants are to be so arranged that any part of the protected area can be reached with at least one<br />
foam applicator and hose.<br />
One foam hydrant is to be arranged at the access to any area to be protected. The total of foam applicators<br />
available shall not be less than four.<br />
F.3.4<br />
Location of the system<br />
F.3.4.1 Foam storage tanks, associated pumps, proportioners and controls shall be located in a safe<br />
area not likely to be cut off in the event of a fire in a protected area.<br />
The system is to be designed for rapid readiness.<br />
F.3.4.2 In centralized systems shut-off valves are to be provided in order to isolate damaged sections<br />
of the foam main.<br />
F.4 Influence to water fire fighting<br />
The operation of the foam system shall not impair the simultaneous use of any water fire fighting installation<br />
required by these Rules.<br />
Edition 2013 Germanischer Lloyd Page 8–7