Sea-Fire FD 1001-1500, Руководство по установке

Страница: 26 / 44

PN: 123-194, Rev. F Page 26 of 44
Pressure Gauge Inspection
Frequently check gauge for proper pressure, (every 6 months, minimum).
Reading the Pressure Gauge (Inspection)
The green section of the gauge is designed to show proper filling and pressurization at
70°F (21°C). Per applicable design standards, this is defined as ± 10% of nominal fill
pressure.
Sea Fire systems are rated for operating temperatures from 0°F (-17°C) or 20°F (-6°C)
up to 130°F (54°C). Note: This is storage and ambient operating temperature. A fire
condition would obviously reach higher temperatures, with the system activating at
175°F (79°C).
The red section of the gauge, above and below the green section, indicate the
acceptable pressure readings for temperatures below and above 70°F (21°C). The table
located on the included tags show the pressure of the system at corresponding
temperatures.
To inspect a unit when the ambient temperature is other than 70°F (21°C), measure
the ambient temperature and find the corresponding nominal pressure in the table.
Read the tip of the yellow pointer and determine what the internal pressure is by
counting the division lines and adding or subtracting for each line segment from the
black centerline marked, either 240 psi (16 bar) or 360 psi (24 bar).
For FG models (charged to 240 psi): Each line segment within the green and red zones
are equal to 20 psi (1 bar).
For FD models (charged to 360 psi): Each line segment within the green pie is equal to
10 psi (0.68 bar). Each line segment within the red sections is equal to 20 psi (1 bar).

Compare the actual reading to the reference table (see tag). The pressures should
be within ± 20 psi (1 bar) of each other (one segment).

Note: this allowance takes into account allowing for gauge manufacturing
tolerance, temperature reading accuracy and the ability to precisely see the
pointer location.

If the yellow pointer is in either the white zone on the gauge, to the left “REPLACE”
or to the right “OVERCHARGE”, the unit is likely not functional and may require
replacement.

If time and serviceability permits, a suspect unit may be verified by stabilizing the
temperature of the unit at 70°F (21°C) for a minimum of 4 hours and reading the
pressure gauge at that point.
The following graphs show the respective pressure at temperature.