OBS RPG-HC4 Manuale utente
Installation, operation and maintenance manual
Document:
RPG-HC4-P04-MA-IOM
RPG-HC4
Version:
06
Date:
2022.08.18
Page 1 of 4
REVISIONS
Rev. Ref Changes
00 IFI First issue 25th of February 2015
01 IFI Updated, new product designation (from HC4 to RPG-HC4) and template
02 IFI Extended range and added chapter 4 for Evacuating Gas
03 IFI Maintenance period corrected
04 IFI Added instruction to use transport box in chapter 3. Maintenance
05 OBS-P12-201105 Added change of Pilot Valve every service
06 OBS-P12-220809 Revised chapter 4 regarding use of transport box for RPG-HC4
Table of contents
1General information .........................................................................................................................................2
2Installation........................................................................................................................................................3
3Maintenance ....................................................................................................................................................3
4Storing, Packing and Transport .......................................................................................................................4
Installation, operation and maintenance manual
Document:
RPG-HC4-P04-MA-IOM
RPG-HC4
Version:
06
Date:
2022.08.18
Page 2 of 4
1 GENERAL 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 Nm3per 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
Installation, operation and maintenance manual
Document:
RPG-HC4-P04-MA-IOM
RPG-HC4
Version:
06
Date:
2022.08.18
Page 3 of 4
2 INSTALLATION
The RPG-HC4 regulators are arranged on top of a hydrophore tank by means of flanges that are connected to
pipes that directs incoming gas into the upper part of the tank. The gas is supplied to each RPG-HC4 regulator
by means of fittings with 1" NPT threads.
Importance notice regarding operational use:
Due to the fact that these regulators have extreme capacity, the downstream pipe run for each RPG-HC4
connection must never be blocked.
The regulator shall be put in operation by slow opening of the shut-off valves that are connected upstream each
RPG-HC4.
Optimal function of the RPG-HC4 is obtained when the downstream pressure is higher or equal to pre-set level.
The regulator is then in the closed position. If pressure in the AHS drops below set pressure, the regulator will
respond almost instantly and open for air supply to sustain the set pressure.
It shall not be necessary to change the terms of RPG-HC4 during operation. When something indicates that
RPG-HC4 has a malfunction, contact OBS Technology AS for service.
3 MAINTENANCE
No maintenance performed at site. We recommended that each RPG-HC4 unit that are in operational use
should be sent to OBS Technology AS for maintenance first time after 18 months, then every third year.
NB! Use the original aluminum box for transport to prevent damage to the o-ring against the flange.
NB! Adjustments on the RPG-HC4 should be done at OBS’s premises. Special test facilities are required to
do adjustments and verify proper function. Tampering by un-authorized personnel can cause hazardous
flow conditions that can harm the firewater system as well as personnel.
The service will include the following steps:
Service tasks
Internal procedure
Testing in rig prior to disassembly
RPG-HC4-P06-MK-000191
Maintenance incl. complete disassembly, cleaning and inspection of all
parts, replacement of all O-rings and Pilot Valve (art.no01-00378).
RPG-HC4-P06-MK-000191
OBS-P06-KA-000157
Re-Assembly
OBS-P06-KM-000159
Final test RPG-HC4 (functional testing in the test rig)
RPG-HC4-P06-KC-000191
Fill in Service Report
WOXXXX-HC4-P04-RB
Installation, operation and maintenance manual
Document:
RPG-HC4-P04-MA-IOM
RPG-HC4
Version:
06
Date:
2022.08.18
Page 4 of 4
4 STORING,PACKING AND TRANSPORT
The sealings are well protected inside the regulator when stored correctly.
The regulator can be stored on shelf up to 5 years after delivery/previous maintenance, without any
deterioration of the sealings.
Use the original aluminum box with inner wooden casing for transport to prevent damage to the o-ring against
the flange.
Figure 2: Transport box for RPG-HC4
Indice
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