Page 338 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

which should be spaced not more than two or three standard hose
lengths apart. Isolating valves should be fitted so as to retain the
suction from an atmospheric foam tank.่านั้น---
utility of the line in the event of fracture. Suitable pipeline drain
valves and wash out facilities should be provided. A foam solution
pipeline of this type should be designed for a minimum solution
The bulk foam concentrate supplies associated with any fixedชย์นาวี
rate of 115 cubic metres/hour.
Foam concentrate can also be distributed through a smaller bore
pipe system to the tanks supplying the inductors of fixed or mobile
foam making appliances.

Variable Flow Injection Incorporating Atmospheric Foam Tank
and Foam Pump(s)
---ใช้เพื่อการศึกษาเท
This system involves pumping foam concentrate into a foam-main
via a metering device or variable flow injector. The foam pump(s)
would normally be driven by an electric motor and would take
งานห้องสมุด ศูนย์ฝกพาณิ

foam monitor or foam-water sprinkler system should be sufficient
to ensure continuous foam application until the arrival of adequate
backup fire-fighting resources, either water-borne or land based.
In any case, the bulk foam concentrate supply should be sufficient
to ensure not less than 30 minutes of continuous foam application
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at design flow conditions.
19.5.3.8 Monitors (or Cannons)

Monitors may be used for foam and water, although specific types
may be designed solely for foam. Large capacity monitors would
normally be on a fixed mounting or on a mobile unit. The provision
of fixed monitors should be considered for tanker berths handling
ships in excess of 20,000 tonnes deadweight. The scale of
provision should be related to the size, location and frequency of
use of each individual berth.

The number and capacity of foam monitors required will depend
upon local circumstances and conditions, which will include the
capacity of the fire water supply system. Where a single elevated
foam monitor is provided for berth and shipboard fire-fighting duty,
the discharge capacity of the monitor should not be less than
3
3
115 m /hr, but could be as high as 350 m /hr.
The monitors should be supplied from the berth fire-main and
should either be manually activated individually at each monitor
riser or be activated from a remote manual or motorised isolating
valve controlling a group of monitors, depending upon the
particular design.

Monitors may be situated at berth or wharf deck level (normally
only suitable at small terminals) or may be mounted on fixed
towers. The effective height of the liquid stream required from a
monitor is dictated by the particular use envisaged. For example, if
required to assist in the event of a fire involving the ship’s
manifold, the height of freeboard is important and with large
tankers this can be in excess of 23 metres. Ideally, fixed monitors
should be positioned on towers or on top of gangway access
towers in order to ensure that foam discharge will be above
maximum high tide and light ship deck height for adequate

304 © ICS/OCIMF/IAPH 2006