PRESSCON LOX Manuel utilisateur

LOX - Low Oxygen System

User Manual

Type

User manual

Date

21 januari 2021

Version / Revision

Version 4.0, Revision 00

Status

Approved

Company

PRESSCON FX-Prevent

Location

Honselersdijk

 
 
3 
Inhoudsopgave 
1INTRODUCTION.............................................................................................................................................................4 
 THE GOALS OF THE INSTALLATION.................................................................................................................................4 
 REDUNDANCY .........................................................................................................................................................4 
2PRECAUTIONS AND SAFETY INSTRUCTIONS FOR NITROGEN GENERATORS ....................................................................5 
 GENERAL SAFETY STANDARDS......................................................................................................................................5 
 WORKING WITH THE NITROGEN GENERATOR....................................................................................................................5 
 DESCRIPTION OF HAZARD SYMBOLS...............................................................................................................................5 
3THE LOX INSTALLATION.................................................................................................................................................7 
 THE LOX SYSTEM BASICS ...........................................................................................................................................7 
 SYSTEM DESCRIPTION................................................................................................................................................9 
 Compressor............................................................................................................................................................ 9 
 Compressed air conditioning ................................................................................................................................. 9 
 Nitrogen generator................................................................................................................................................ 9 
 LOX opstelling...................................................................................................................................................... 10 
 Nitrogen inlet....................................................................................................................................................... 10 
 N2Control ............................................................................................................................................................ 11 
 Ox Control............................................................................................................................................................ 11 
 Oxygen sensors.................................................................................................................................................... 11 
 Informing and alerting ......................................................................................................................................... 12 
 The Color Display ................................................................................................................................................. 12 
 Emergency stop ................................................................................................................................................... 13 
 Humidity sensor................................................................................................................................................... 13 
4BEDIENING VAN DE INSTALLATIE.......................................................................FOUT! BLADWIJZER NIET GEDEFINIEERD. 
 ECD DISPLAY .......................................................................................................................................................14 
 ECD Display front................................................................................................................................................. 14 
 Buttons on the ECD Display ................................................................................................................................. 14 
 Button functionality............................................................................................................................................. 15 
 Status LED’s ......................................................................................................................................................... 17 
5ASSEMBLY INSTRUCTIONS...........................................................................................................................................18 
6MEASURES DURING DECOMMISSIONING ....................................................................................................................18 
7ERRORS .......................................................................................................................................................................19 
 ERRORLEVELS........................................................................................................................................................19 
 Error messages in general.................................................................................................................................... 20 
 Error messages from the N2Control.................................................................................................................... 24 
 Error messages from the ECD Display.................................................................................................................. 28 
 Error messages from the Ox Control ................................................................................................................... 32 
 Error messages from the FX Connect................................................................................................................... 36 
 TROUBLESHOOTING ................................................................................................................................................40 
 Reaction times..................................................................................................................................................... 40 
8MAINTENANCE............................................................................................................................................................41 
 FX PREVENT.........................................................................................................................................................41 
 Compressor.......................................................................................................................................................... 41 
 LOX system .......................................................................................................................................................... 41 
 Oxygen sensors.................................................................................................................................................... 41 
 Pressure Equipment, examination of commissioning and reinspection during using phase............................... 42 
 MAINTENANCE CONTRACT........................................................................................................................................42 
9APPENDIX....................................................................................................................................................................43 
10 DOCUMENT HISTORY ..................................................................................................................................................43 
11 TO CONCLUDE .............................................................................................................................................................44 
 
 

1Introduction

The Goals of the installation

Fires can cause very great damage to the environment and to property. In addition, there is a high potential risk to humans.

The primary goal of the LOX system is to prevent fire in a specific area or to drastically reduce the risk of fire. A fire that does

start, despite of the precautions, will remain limited and will develop less quickly. This significantly increases the escape time

of those present and the intervention time for the emergency services.

The LOX system works on the basis of permanent oxygen reduction by supplementing additional nitrogen. The air around us

consists of approximately 20.8% oxygen, 78% nitrogen and 1% other gases. The LOX H.P. LOW OXYGEN system changes the

balance between oxygen and nitrogen. The optimum oxygen percentage depends on the nature of the flammable substances.

In the LOX system, a nitrogen generator is used. In this generator compressed air is separated into oxygen and nitrogen. The

oxygen is relieved into the surrounding area. The nitrogen is used to regulate the mixture of oxygen and nitrogen in the

protected room. The required compressed air is produced by means of a compressor.

Only FX Prevent or an authorized party is allowed to modify the installation. The installation should only be used for the

purpose for which it was designed. The system is designed and tuned for specific operating parameters. These may only be

changed by FX Prevent or its authorized party. The operating pressure of the installation is between 0 and 8 bar. The design

pressure is 10 bar. This pressure may not be exceeded under any circumstances. The temperature of the room where the

system is installed should be no lower than +3 °C and no higher than +40 °C.

Redundancy

The LOX system, like all other technical installations, has the risk of malfunctioning. When this happens, the prevention of fire

in a specific area can no longer be guaranteed. In order to still be able to give this guarantee, the concept of redundancy is

very important in the design of the LOW OXYGEN systems. FX-Prevent follows the Master/Slave principle for this.

A master version of the LOX system controls a complete single system. This can consist of a compressed air production

system, nitrogen generator system, sensors and a measurement and control module. The capacity is calculated in such a way

that the installation can independently control the percentage of the protected area.

A slave version of the LOX system controls a complete or partially complete installation. This can consist of a compressed air

production system, nitrogen generator system, sensors and a measurement and control module. The machine is designed in

such a way that it can independently maintain the percentage in the protected area if there is a problem in the master

system.

The composition of the Master and Slave system and the level of redundancy are tailored to the user's requirements and can

therefore be different for each installation.

2Precautions and safety instructions for nitrogen generators

General safety standards

When working with the nitrogen generator of FX Prevent, there are some safety risks that have to be considered. The risks

involve subjects such as dangerous voltage, high pressure and dangerous gas to inhale. This is addressed in this chapter. It is

highly recommended that the safety risks are observed before work on the devices is commenced.

Working with the nitrogen generator

The nitrogen generator is commonly located in the technical room of the facility. When operating or when working on the

nitrogen generator, the following hazards should be considered.

Symbool

Omschrijving

Geldt voor

HIGH PRESSURE, Relief

pressure from components

before work is conducted.

The external components of the nitrogen generator which are:

•Valves;

•Hoses;

•PSA vessels.

DANGEROUS VOLTAGE,

Forbidden to work on the

system if the power is on.

The internal parts of the control cabinets, UPS control cabinets, junction

boxes and sensors. These parts are:

•PCB’s within the control cabinets;

•PCB of UPS control cabinet;

•DC batteries of UPS control cabinet;

•The applied voltages are: 24V AC, 24V DC, 230V AC, 380V AC.

DANGER OF INHALATION,

danger of asphyxiation if

breathing high concentration

of nitrogen.

Avoid the specified area to

avoid health hazards.

The nitrogen output connection. The mixture produced by the nitrogen

generator consists of 95% or more nitrogen. Inhalation directly from the

output connection may cause intoxication. The nitrogen quickly mixes with

the ambient air so that at a distance of >0.5m from the nitrogen output

connection it no longer poses a health risk.

Description of hazard symbols

In addition to the identified risks for the nitrogen generator, the following symbols can also be applied within the system of

which the nitrogen generator is part of. When a hazard symbol is encountered, please observe its meaning carefully before

further commencing the work.

Symbool

Omschrijving

Symbool

Omschrijving

1. OVERPRESSURE VALVE,

Be aware of the sudden relief of

overpressure.

7. HIGH PRESSURE,

Relief pressure from components before work

is conducted.

2. DANGEROUS VOLTAGE,

Forbidden to work on the system if the

power is on.

8. HOT PARTS,

Do not touch parts with bare hands. Use heat-

resistant clothing.

3. DANGEROUS TO INHALE GAS,

Avoid the specified area or wear appropriate

breathing equipment.

9. SUFFOCATION,

If the oxygen concentration is to low then do

not enter the room, risk of suffocation.

4. MACHINE WITH AUTOMATIC START,

Machine stops and starts automatically

when it is operating normally. Turn off the

machine completely before working on it.

10. ROTATING FAN,

Risk of getting stuck or injuries to limbs. Turn

the machine off completely before working on

it.

5. NOISE,

Wear ear protection to prevent hearing

damage.

11. ATTENTION,

Special situation occurs, follow additional

instructions.

6. READ THE OPERATING AND

MAINTENANCE INSTRUCTIONS,

It is advised that the maintenance

instructions are read before continuing

work.

12. MOVING PARTS,

Risk of getting stuck or injuries to limbs. Turn

the machine off completely before working on

it.

For the precautions and safety instructions of miscellaneous components that are related to the nitrogen

generator, please refer to the enclosed instructions of those components that are provided by the

respected manufacturers. These can be found with the specific components upon delivery or are included

within the technical file of system of which the nitrogen generator is part of.

3The LOX installation

The LOX system basics

The LOX oxygen reduction system is delivered as a complete installation. On the next page a schematic overview of the

complete system and its components can be found. The drawing also shows that a distinction can be made between the LOX

unit and the area(‘s) to be protected.

The LOX system is usually installed separately from the room(s) to be protected, for example in the technical room. A

complete LOX system consists of:

•Compressed air facility;

•Water and oil separators;

•Compressed air buffer tank;

•One or more air dryers;

•Liquid and residual dust filters;

•Moisture detection sensor;

•The nitrogen generator(s);

•Dust filter(s);

•Nitrogen flow and purity measurement;

•Control cabinet;

•Piping for nitrogen supply;

•Flashing light;

•Acoustic alarm (slowwhoop / evacuation alarm);

•Door display at each access door;

•Communication equipment for communication with the supplier's failure department;

•Electrical cabling for the control centre(s), oxygen measuring equipment, alarm detectors and access control

equipment.

The LOX oxygen reduction system serves a maximum of 24 rooms. The following components are installed in each of these

rooms:

•Supply points for nitrogen;

•3 oxygen sensors (minimum 3 according to EN 16750);

•Flashing light;

•Acoustic alarm (slowwhoop / evacuation alarm);

•Door display at each entrance door except for automatic sluices.

If the LOX oxygen reduction system is used to protect a refrigerated area where the temperature is below 0 °C, an alternative

assembly is used. In this application, the following components are placed outside the protected areas:

•Flashing light;

•Acoustic alarm (slowwhoop / evacuation alarm);

•Door display at each entrance door except for automatic sluices.

Figure 1: Schematic setup of the LOX system basics.

System description

Compressor

For the operation of the nitrogen generator, a compressor with the necessary compressed air conditioning is available. The

compressor produces compressed air for the nitrogen generator. The compressor must be able to provide sufficient capacity

and keep the compressed air pressure in the buffer tank at the required level at all times to keep the system operational.

As soon as there is a temporary voltage drop, the compressor must be activated manually. The compressor switches off for

safety reasons and may not be switched on automatically. The LOX system switches itself on again and reports a power

failure in the log.

For further explanations on the operation of the compressor, please refer to the respective instructions.

Compressed air conditioning

Compressed air conditioning components are installed between the compressor(s) and the nitrogen generator set(s). These

are selected depending on the situation of the respective installation. The functioning of the LOX system depends on the

quality of the supplied compressed air. FX Prevent sets high demands on the compressed air quality in order to guarantee the

lifespan of the nitrogen generators. If condensate forms in the compressed air supply, this will lead to damage to the nitrogen

generators of the installation. FX Prevent has taken measures to permanently monitor the quality of the compressed air by

using a moisture detection sensor. The compressed air conditioning section consists of the following components, depending

on the installation:

•Water separator (per compressor)

•Compressed air buffer tank

•Oil and water filtration

•Dryer(s)

•Oil, water and fine dust filtration

Nitrogen generator

The nitrogen generator produces nitrogen using PSA (Pressure Swing Absorption) techniques.

High Performance PSA nitrogen generator

A High Performance PSA set consists of two vessels filled with activated carbon. The active carbon has the ability to absorb

oxygen molecules at a high pressure, meanwhile the nitrogen molecules will pass through.

The process operates as follows:

One of the two PSA vessels is in operation. The nitrogen is produced until the activated carbon in the HP-PSA vessel is

saturated with the oxygen molecules. When this is achieved, the control system will automatically switch to the second PSA

vessel so that both tubes are equalised with compressed air. The first PSA vessel is relieved of its pressure which causes the

active carbon to lose its ability to absorb oxygen molecules. The oxygen molecules that are released will be vented into the

surrounding. This cycle can repeat itself as many times as necessary.

LOX setup

Depending on the requirements, a single system or a redundant system with several HP-PSA units is used. The diagram below

shows both systems.

Single system

Redundant system

Compressor

Dryer

Compressed air

pressure vessel

Filtration

PSA-

Unit

Filtration

Protected Area

Compressed air

pressure vessel

Filtration

Protected Area

PSA-

Unit

PSA-

Unit

Dryer

Compressor

Figure 2: Basic set-up of a nitrogen generator. Single set-up and redundant Master/Slave set-up.

Nitrogen inlet

For optimum fire safety, it is important that the necessary oxygen content is achieved throughout the protected area.

Depending on the dimensions, the shape of the room and the objects present, nitrogen is injected at one or more locations. If

several rooms are protected with one LOX installation, the distribution is regulated by means of valves.

The supply of nitrogen is automatically controlled via the LOX control software and is not described separately in this manual.

LOX controller

The LOX controller is the nerve center of the installation. The basic functions of the controller are:

•the control of the nitrogen production units;

•taking care of the communication between the various components;

•registering and correcting any deviations.

The LOX controller can be connected in a number of ways.

•The installation functions as a stand-alone unit. The control takes place via the ECD display;

•The installation is connected to, for example, a PC and/or network. This offers the possibility to collect data about

the functioning of the installation and to carry out extensive analyses with the help of the LOX studio software;

•The LOX controller is linked to other fire protection systems and/or a building management system. Via this

connection it is possible to send messages to, for example, the own technical service, an external alarm centre

and/or the FX Prevent service.

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