Installation, operation and maintenance manual
Document:
RPG-HC4-P04-MA-IOM
RPG-HC4
Version:
06
Date:
2022.08.18
Page 2 of 4
1 G
ENERAL INFORMATION
The RPG-HC4 is a high-capacity pressure reducer valve for air or nitrogen, designed to comply with the
following conditions;
Supply pressure:
50 – 225 barg
Outlet pressure:
2 – 14 barg
Max. flow rate:
4 Nm
3
per second at min 180 barg supply
The RPG-HC4 is specially designed to provide a well stabilized driving force for water stored inside a
hydrophore tank, and thereby enable immediate supply of fire water. The concept is called Active Hydrophore
System (AHS). The AHS sense sudden decrease in water pressure and immediately begins to discharge water
from the hydrophore tank into the firewater ring main, such that a positive pressure is maintained at the top of
the risers.
The RPG-HC4 main components are produced in Titanium (gr. 5 in inlet valve and gr. 2 in pressure housing and
seawater exposed parts). The main springs are in stainless steel or nickel alloy (Hastelloy).
RPG-HC4 regulators are designed to comply with the following requirements:
The RPG-HC4 units shall be able to provide a flow rate more than 2.3 Nm3 per second when gas
supply pressure is 80 bar or more.
In an AHS, RPG-HC4 regulators are coupled in parallel. These regulators must at any time co-
operate without causing pressure pulses or oscillations.
The RPG-HC4 units must be able to sustain the pre-set pressure in the hydrophore tank even if
very quick changes in gas delivery are required.
Figure 1: RPG-HC4
