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Fire water supply for high-rise buildings and properties

SKYLINE SAFE WATER SYSTEMS

UID


SKYLINE SAFE WATER SYSTEMS FIRE WATER SUPPLY FOR HIGH-RISE BUILDINGS AND PROPERTIES

Security for both user and planner One pump* – one line for the system Footprints as low as 0,64 m2

*

excluding reserve pump


/// GEP Industrie-Systeme GmbH ///  www.GEP-H2O.de ///

/ 01 / PRESSURE LIMITATION IN EXISTING AND NEW FACILITIES

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FOR FIRE WATER SUPPLY

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Due to the many renovation projects being carried out in respect of drinking water hygiene in existing installations, numerous fire water systems in large properties and high rise buildings have been separated from the drinking water network over recent years. In this respect, contingent on the physical determining factors such as building height or network size, the problem presents itself for technical planners and executors of how to properly renovate or build new. Technologies have to be utilised which will ensure a defined

minimum supply pressure at hydraulically unsuitable hydrants and which, in so doing, will not exceed the maximum threshold value of 8 bar. In almost all German Federal States, the majority of such buildings and properties fall within the scope of the test directives of that state. To this end, the legislators specify that fire water installations are to be tested at regular intervals by building control authorised specialists to ensure the effectiveness of the fire water installation in compliance with the above given example of threshold values.

The „right of continuance“ as an excuse Should flow pressures of over 8 bar be discovered during the technical approval inspection by state accredited specialists, there exists the widespread notion that the installation being tested still in fact enjoys the right of continuance. An interpretation that is neither endorsed by the generally recognised rules of good practice1 nor by the legislators2;3. Regarding the maximum supply pressure, the regulations in the German High-rise Building Guidelines or draft Highrise Building Guidelines2;3 and the Standard DIN 1446211 are of importance. Commenting on the draft High-rise Building Guidelines3, one passage in particular is dedicated to existing installations

where statements are made on the mitigation of the minimum flow rate or the minimum supply pressure in agreement with responsible fire prevention authorities. Regarding the maximum supply pressure which, from the point of view of operational safety is also important, a deviation from the threshold value is not to be found. In fact, the maximum flow pressure was already limited to 7 bar in the case of older installations by virtue of the recognised rules of good practice. It was not until the appearance of the new Ordinance MBO2 in 2008 that the above threshold value was increased to 8 bar and adopted into the subsequent application standard DIN 144621.

Inept approach to the solution In deploying what appears at first glance to be an inexpensive technology, the practice of utilising pressure reducers in the fire water lines is encountered time and again. Many users are unaware that in deploying this type of valvework in the fire water supply, there is a serious risk to be assumed that the fire water installation may fail. This is a type of installation that provokes endangerment to the protection of people and assets. It is not for nothing that the

pertinent application standards, e.g. DIN 19884 and 144621, have been advising against the utilisation of pressure reducing valves in fire water systems for decades now. The previously trusted and undisputed safe functioning of the pressure reducer in the drinking water installation4 is heavily dependant on the entry of dirt into this type of valve. The relevant Standard1 points in particular to the fact that only components which are

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specifically suitable for fire water supply are to be fitted in fire water installations. The utilisation of this kind of valve in the fire water line network presupposes the verification of operational reliability in the form of a technical assessment by an accredited test centre or the application of a product standard. For this reason, leading manufacturers of various types of pressure reducing valves specify in principle that this valve be protected by an upstream filter. Filters fitted in the fire water line for the functional security of the pressure reducing valves constitute a high risk of constriction that can lead to the failure of the entire fire water installation. In consequence, only coarse filters, also described as stone traps, greater than 1 mm* for wall hydrants, for example, or greater than 5 mm for sprinkler installations, are permitted5;6. Dispensing with the fitting of filters before the pressure reducing valves contrary to the stipulations of the manufacturer can lead to a total failure of the control valvework and/or com-

p

FILTER Pressure reducing valve protected by filter

plete interruption of the water flow. Dirt particles in the fire water lines can reach extreme proportions of a such a kind unknown in drinking water installations. As a consequence of the long dwell period of the fire water in the pipework and its associated corrosion, substantial corrosion products and scaling occur which, particularly in the case of galvanised iron materials, are loosened when water is drawn off. In addition to deposits and corrosion products in the domestic plumbing system, particles are entrained via the service line. In the event of fire, high flow velocities occur in the property service line. Particularly in the case of older public supply lines, this gives rise to massive dirt entrainment in the fire water pipework.

53 mm

53 mm

Deposits and particles in various existing fire water installations supplying hydrants

Safe regulation-conformant engineering executions The objective of any technical planning or exe- from a wall hydrant at the start of the fire-fightcution must be to ensure the maximum supply ing deployment with 24 l/min up to a maximum pressure limit of 8 bar under all operating con- water withdrawal rate of, for example, 600 l/ m ditions. This means that the drawing of water must not exceed this threshold value.

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* In the opinion of the writer, greater penetrability should be selected even for wall hydrants, e.g. 5 mm.

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/// GEP Industrie-Systeme GmbH ///  www.GEP-H2O.de ///

/ 02 / THE ELABORATE CLASSIC | PRESSURE ZONES The elaborate classic, which is typically applied, Fire water supply via for instance, to the drinking water supply in acpressure zones with separate pressure boosting cordance with DIN 1988 Part 5007, is based on the division of building complexes into pressure zones. These are then fed, each from an individual redundant pressure boosting plant, by their own riser. If this permitted design is applied to fire water supply, additional technical requirements1 are set. Due to the considerable space requirement at the installation site and in the services shaft, sity of at least a second riser, makes this is a very the required redundancy2;3 of all sensing, actu- elaborate system which in practice offers only ating and control elements as well as the neces- limited suitability.

An article on the subject of redundancy can be requested from the publisher and is available as a download from: GEP-H2O.de

/ 03 / PRACTICAL SOLUTIONS Real Pressure Method | Skyline

Unitary model range Serie 300; Serie MAX

te ste d

unlimited

More complex high-rise buildings or extensive properties also require automatic monitoring of the fire water hydrants and fire-safety system in addition to the geodetic height-dependent and sitespecific pump operating point arrangement. Properties of the above size and/or high-rise buildings are generally characterised in this group in that more than 50 hydrants are supplied with fire water via branched networks over greater distances. Overview of control methods for a large high-rise building or large property, operating point > 8 bar, more than 50 wall hydrants

300

DRINKING WATER SEPARATION STATION

Speed control

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With speed control, a frequency inverter makes it possible to ensure the maximum supply pressure limit by altering the rotary speed of the pump. Speed control is the energy-efficient variant. The speed control technologie are deployed in high-rise buildings. The only difference is that the necessary operating pressure be made available in several main pressure stages.

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REAL PRESSURE METHOD ONE RISER ENERGY-EFFICIENT NO PRESSURE REGULATOR ONE PUMP EXCLUDING REDUNDANCY

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Speed control

ONE RISER ENERGY-EFFICIENT NO PRESSURE REGULATOR ONE PUMP EXCLUDING REDUNDANCY Speed control method – overview

A division of the building into several electrical groups, e.g. every 8 floors, enables catering for individual operating points by means of pressure boosting when a limit switch is triggered. If, for example, a wall hydrant on the 20th floor is activated, the pump provides a supply pressure of 12 bar. On the other hand, if a wall hydrant is triggered in the underground car park, a supply pressure is provided of only 5 bar.

Pressure decrease Prerequisite for this kind of trend-setting technology is that, along with the appropriately rapid pressure build up, a reliable decrease in pressure takes place within 2.5 seconds independent of the size of the line network. In order to safeguard against unacceptable pressures,

the above reaction time has been assigned a safety factor in accordance with GEP in-house standards. This is yielded by the smallest necessary time span required for a hose connection valve to open and the dimensionally stable hose to fill up.

Pressure decrease reaction time

2s

The bus system The real pressure method is applied to this category of buildings and properties regardless of size or expansiveness. A special electronic bus system with up to 1000 metre line lengths and assured reaction times of < 1 sec enables the monitoring of hundreds of hydrant systems distributed throughout the entire complex thereby making available the necessary site-specific hydrant flow pressure utilising only one hydraulic and one electrical line system. In consideration of these technologies, the building regulation axiom9 is applied that it is to be assumed that only one event of fire will occur in a building at any one time. This can then be com-

High speed bus system

1ss Bus evaluation bated with the aid of up to 3 wall hydrants (e.g. fire-fighting on the 42nd, 43rd, and 44th floors). Simultaneous fire-fighting in different locations within one building is not taken into account8;9.

Limit switches For high-rise buildings with an operating point > 8 bar it is necessary to fit at least some of the wall hydrants with limit switches. Limit switches are small switching elements which give out a signal when the wall hydrant is opened or the hose connection valve is act-ivated. In this regard, the electrical wiring system has to be permanently monitored for short-circuits, cable breaks and tripping.

Hose connection valve with limit switch, PN 25

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For further information see our datasheet: 2" hose connection valve PN 25

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/// GEP Industrie-Systeme GmbH ///  www.GEP-H2O.de ///

/ 04 / HIGH-RISE CONTROL BY REAL PRESSURE METHOD 

The use of pressure reducing valves is to be avoided. DIN 1988-5 DIN 1988-60 DIN 14462

3 x 200 l/min 4,50 bar

bar

50th floor

optional

43rd to 49th floor

Reference example

Frankfurt/M., Germany

Reference example

AMERICAN EXPRESS

Frankfurt/M., Germany

BUS PROCESSING Unitary model range Serie 300; Serie MAX

te ste d

Open discharge

One Drinking Water Separation Station, one pipeline system.

4,50-8,00 bar

41th floor

No pressure reducer – always < 8 bar

4,50-8,00 bar

10th floor 3rd to 9th floor 4,50-8,00 bar

2nd floor

4,50-8,00 bar

GL

1st floor Drinking water consumers

Open Discharge

FILTER Automatic seal-off

Underground car park

Emergency pump drainage

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s patent es

nt Pate k man mar Ger Trade e and Offic

000

m3

Wet-dry module

ed

re gis

Installation possible below backflow level.*

42th floor

TRINKWASSER TRENNSTATION

Proc

GOK

4,50-8,00 bar

One pressure zone for unlimited building height

High-rise building = more than 12 full floors or leaning ladder access > 22 Meter, unlimited pumping head

DEUTSCHE BANK

ter

Basement

endorsed by:

PUBLIC DRINKING WATER

No pressure-reducing valves and always < 8.0 bar Installation below backflow level* Stage III redundancy of actuators and control elements

Optional frost protection in underground car park Footprint as low as 1,3 m2 (1,60 x 0,8 m) One pressure boost with two pumps, one fire water line for the entire building

Information on the real pressure method can also be found in our Guide to Sprinkler Equipment

04

Installation of a Drinking Water Separation Station below backflow level | Fire water supply using variable speed high-rise building control | Floordependent triggering and symmetrical redundancy, stage III | Basis: Deutsche Hochhaus-Richtlinie (German high-rise building guidelines) edition 08

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Taking one of the highest buildings in Germany, the Deutsche Bank HQ in Frankfurt am Main, as an example, approximately 200 wall hydrants with only one riser per building are monitored and securely served by only one pump and one additional reserve pump. Another example is the Rhรถn Clinic property. The entire complex extends over several hectares of ground. Apart from the various administration buildings, wards, high-rise buildings and other items of property are located on this site, all of which have to be provided with fire water. The classical solution would have resulted in supply being provided by multiple pressure boosting plants throughout the whole grounds. By using the real pressure method, the entire fire water provision, including external hydrants can be secured using only one pump and line system.

Deutsche Bank in Frankfurt/Main, Germany real pressure method

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Property in Berlin, Germany real pressure method

American Express in Frankfurt/Main, Germany real pressure method

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/// GEP Industrie-Systeme GmbH ///  www.GEP-H2O.de ///

/ 05 / DRINKING WATER SEPARATION STATION UP TO 1,000 m3/h

ONLINE VIDEO CLIP

Example: Drinking Water Separation Station, type C 309 for wall-mounted hydrants

Unitary model range Serie 300; Serie MAX

te ste d

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Example: Drinking Water Separation Station, type C 314 for wall-mounted and external hydrants

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A WARM WELCOME TO GEP  INDUSTRIESYSTEME  For over a decade now, we have been specialising exclusively in the field of drinking, process and fire water supply. We would like to do justice to your requirements through our personal, qualified customer advice, long product service life and the intrinsic values of our company management.

We hope you will find the presentation of our products and services to be of interest and look forward to cooperating closely with you.

Rudolf Gruber

Enrico Götsch

Senior partner

Managing Director

FURTHER BROCHURES ON THE SUBJECT OF DRINKING,  PROCESS AND FIRE WATER TECHNOLOGY

endorsed by:

No guarantee is given or implied by the information contained in the brochure. We reserve the right to make alterations without prior notice.

2" HOSE CONNECTION VALVE PN 25 PN 25 WITH GROOVED END

PN 25

entirely red brass | in wetted area in accordance with EN 12502

based on DIN 14461

maintenance-free screw sealing

connection: DN 50 (2")

pressure stage (PN) 25 bar

FIGURE 144 61

PRODUCT DESCRIPTION

Hose connection valve optionally with limit switch and connecting piece assisted by:

GEP hose connection valve – Tender specification Hose connection valve for wall-mounted hose reel systems type F, can be integrated in all wall-mounted hose reel systems in accordance to DIN 14461, resistant to corrosive water, wetted parts made of red brass in accordance to EN 12502, self-greasing EPDM lip seal, maintenance-free spindle, EPDM-WN21 seat seal with pivoted cone protected against pressure surges, spindle thread, unwetted parts, in accordance with DIN 14 461-3, rated pressure PN 25, including holder for optional GEP limit switch, grooved end DN 50 (2’’)

GEP INDUSTRIE-SYSTEME GMBH

BRÜCKENSTRASSE 11

D - 08297 ZWÖNITZ

grooved end

H1 = approx. 110 mm

Casing, top, spindle, cone, valve seat Top seal, spindle seal, cone seal Cone nut, washer Head end Handwheel

red brass EPDM SS brass cast aluminium

WWW.GEP-H2O.DE INFO@GEP-H2O.DE F +49 (0)3 77 54. 33 61.10

T +49 (0)3 77 54. 33 61.44 T +49 (0)3 77 54. 33 61.0

DATASHEET

DN 50 approx. 110 mm 133 - 152 mm 60.3 mm 100 mm 2.25 kg 50.2 m³/h 3.9

D = 100 mm

DIMENSIONS

L1 = 133 – 152 mm

Nominal width Overall height (H1) Overall length (L1) Pipe connection size (d) Handwheel diameter (D) Weight Max. flow rate (kvs) Loss factor (ZETA)

MATERIALS

for indirect connection of drinking water systems

DRINKING WATER SEPARATION STATION

TECHNICAL

DOCUMENTATION

for rainwater utilisation in large-scale systems

DRINKING WATER SEPARATION STATION

GUIDE

for sprinkler systems up to 16,600 l/min

DRINKING WATER SEPARATION STATION

GUIDE

for wall-mounted and external hydrants

DRINKING WATER SEPARATION STATION

GUIDE

Guide: Drinking Water Separation Station for wall-mounted and external hydrants Guide: Drinking Water Separation Station for sprinkler systems up to 16,600 l/min Guide: Drinking Water Separation Station for rainwater utilisation in large-scale systems Guide: Drinking Water Separation Station for indirect connection of drinking water systems Technical documentation: Drinking Water Separation Station Datasheet: 2" hose connection valve PN 25 Datasheet: Pump-emergency drainage/Installation below backflow level


endorsed by:


PROCESS WATER, FIRE WATER DRINKING WATER

SUPPLY

BRÜCKENSTRASSE 11

D – 08297 ZWÖNITZ

WWW.GEP-H2O.DE INFO@GEP-H2O.DE EN DE

T +49 (0)37754. 3361.44 T +49 (0)37754. 3361.0 F +49 (0)37754. 3361.10

Rv. LF-TWTS-HH-BCAB EN US

GEP INDUSTRIE-SYSTEME GMBH

GUIDE SKYLINE SAFE WATER SYSTEMS  

Fire water supply for high-rise buildings and properties