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Grundfos Fire Systems Hydro EN


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Speci cations of pumping sets with end-suction type electric and / or diesel driven pumps, according to UNI EN 12845, UNI 10779 and UNI 11292

Standards (with reference to the relevant points of the same)Hydro EN automatic pumping sets for water supply of re systems, made in compliance with the requirements from the fol-lowing reference Standards:UNI EN 12845 - Automatic sprinkler systemsUNI 10779 - Hose reel and hydrants systemsUNI 11292 - Compartments for installations of re ghting pumping sets (for the applicable aspects).

The pumping sets are designed to operate with water and for supplies of the single (9.6.1), single superior (9.6.2) and double (9.6.3) types for the sprinkler system, and are compact, robust and modular.In pumping sets with two pumps, the modularity makes it possible to provide the pumping units, with associated equipment,in macrobloc pre-assembled that facilitate the transportation, handling, positioning and installation .

The pumping sets are built using components and materials PN 16 rating, so as to be compatible with the speci c operationalaspects indicated by the reference standards , with speci c respect to:

- Rated pressure of the set components not less than 1.2 MPa (12 bar) (UNI 10779, 6);- Hydrostatic check of the re- ghting system for at least two hours at the minimum of 14 bars (UNI 10779, 9.2.2) or a mini-

mum of 15 bar (19.1.1.2), to be performed during testing of the same.The compositions of the pumping sets, according to the criteria of the standard are : one or more electric driven main pumps for single water supply type one electric driven pump + a diesel driven main pumps for water supplies of all types one or more diesel driven main for water supplies of all types one electric driven + two diesel driven main pumps (on request) for water supplies of all types

The pumping sets are tted with a multistage pump for pressure maintenance ( jockey pump) which avoids unnecessary start-up of the main pumps, by restoring the system pressurization in case of small leakages.The performance of the pressure maintainance pump does not contribute to the calculation of the duty ow that feed the re-

ghting system, and must be limited so as to be unable to feed even a single sprinkler, if open (10.6.2.5). Thus, in the case ofreal need, it is always caused the starting of the main pumps..

The main pumps utilized are of the horizontal centrifugal end-suction type, with spacer coupling , so as to ensure to removeindependently either the pump end or the engine and inner parts of the hydraulics can be inspected without disconnecting thepiping from the pump body (10.1).


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Pumps of the Hydro Sets have performance according to EN ISO 9906 Annex A (formerly ISO 2548) and theirQ-H characteristic is stable (10.1). The pumps are equipped with motors or engines that deliver at least thepower required at the ow corresponding to the NPSHR value equal to 16m (10.1.b).

The by-pass ow rate necessary to avoid overheating of the pump in case of operation against closed valve(10.5) and the ow rate for cooling of the diesel engine (10.9.3.b), where used, shall be indicated by themanufacturer and must be delivered by the selected pump in addition to the design ow rate (10.5).

For systems precalculated of the HHP and HHS types (High hazard class environments) , the pump must beable to provide 140% of capacity at a head not below the 70% of the head at the design ow rate (10.7.2).

In sets with two pumps, each one must be capable of delivering the required design performance (10.2).If a second pump is present, it must be regarded as a reserve one. In sets with three pumps, each one mustbe capable of delivering 50% of the capacity at the required design head (10.2). The third pump is forreserve. When two or more pumps are installed, their characteristic curves are compatible towork in parallel at any allowed ow rate (10.2).In case of pumping sets with more than a pump for single superior ordouble types of water supplies, only one pump can be driven by an elec -tric motor while the other must be driven by a diesel engine (10.2).When selecting the pump model, friction loss in the intake piping andthe suction level must ful ll the requirement of the standard: NPSHD NPSHR + 1 [m](10.6.2.1).

The mode of operation requires that for each pump two pressure-switches are connected in such a way that each one can enable theautomatic starting (10.7.5.1), while the stop is manual (10.7.5.2).In pumping sets for water supply of re hose or hydrants systems it is permitted to use a timer for automatic stop of the mainpump after a minimum of 20 from the end of the water demand (UNI 10779, A.1.2).

The suction connections are sized in accordance with the provisions of rules in the respect of the prescribed minimum diame-ter and maximum velocity at the maximum ow rate, i.e.: DN65 minimum and 1.8 m/s if the pumping set is installed in posi-tive inlet pressure mode; DN80 and 1, 5 m/s if installed under suction lift condition .The ttings have a controlled tapered angle to ensure thelowest possible friction loss. Those at the suction side have eccentric

shape to dispose of air in the inlet pipes (10.5, 10.6.2.1).The check valves are of the sandwich type, with spacer device for easy maintenance. The valves are lockable and have a status indicator (15.2). For sizes larger than DN 100 driving is by a wheel handle with gear (UNI 10779, 6.3).The valves and the cross sections of the hydraulic components are sized to minimize the friction loss so that the performancedelivered by the pumps are almost unaltered when transferred to the discharge point of the pumping sets .

The control panels are individual for each pump and have the following features and functions (10.8.5, 10.8): enclosure class IP54 high breaking capacity fuses that allow the starting current to pass for at least 20

seconds. Contacts conform to the AC3 category (10.8.5.3)

Direct on line starting (DOL) up to 30 kW Star/Delta starting (/Y) from 37 kW onwards Manual Start / Stop push-button for the motor Selector for Operating mode TEST-0-AUT, with removable key Push buttons for independent test of each pressure-switch per each pump Push button for the test of the signaling lights of the panel Single output (potential free contact) for each of the condition signals to be reported

to remote locations .


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For the diesel pump panel, particularly: alphanumeric LCD display 62x25 mm with 4 rows and 16 digits, multi-function with

the following eight parameters displayed simultaneously

- engine status (or speed when the engine is running)- status of the operating mode switch- operating time counter- engine temperature- oil pressure- fuel level- battery 1 voltage- battery 2 voltagenote: in case of alarm, the description of the same will be displayed instead of the bat -teries voltage.

emergency start buttons protected by glass enclosure push buttons for the test of functionality of the emergency start device.

The jockey pump panel has the following components and functions on its front side: door-blocking main switch, lockable mains indicator light selector for operating mode TEST-0-AUT light indicators for pump in operation light indicator for thermal switch tripping.The panel is designed to receive a potential free signal (by relay) from a low level detector, thus allowing the use of the jockey pump for restoring the level in the primingtank.

The diesel engines driving the pumps can be operated continuously at full load and are chosen with a power output corresponding to the ICFN code curve, according to ISO 3046 (10.9.1).

Diesel engines with rated power greater than 30kW are liquid cooled with dual belt driven pump and water-water heatexchanger (10.9.3), so that their cooling is as independent as possible from the heat disposal conditions of the pumpinstallation room (UNI 11292 5.4.2.1).

The fuel tank is sized to allow at least 6 hours of operation (10.9.6).The muf er is included in the scope of supply, as integrated or loose part to be mounted during installation .In this case a piece of exible hose is also provided for connection of the elements in the exhaust pipeline from diesel engine.

The starting of the diesel engine is provided by two DC batteries, whose charge is constantly secured.Two battery chargers, one for each battery, are electronically controlled to obtain constant and calibrated performance to ensure maximum ef ciency and extended battery lifetime.

The automatic and the manual starting systems are independent and utilize two differentpower relays (10.9.7.1).The starting of the diesel engines is based on an automatic sequence of six attemptsalternating on the two batteries with battery switch to any starting attempt.For each starting request of the diesel engine, a dedicated electronic device allows for thealternate use of the two batteries and the automatic exclusion of the battery that shouldbe inef cient, if any (10.9.7.2).

In compliance with the requirements of the standards the following items are alsoincluded in the scope of supply:

factory test report of diesel engines (10.9.13.1). diesel pump fuel tank with connection for the vent pipe to be carried out of the

installation room (UNI 11292, 7.4) diesel pump fuel tank with containment wall which

prevents dispersion in the case fuel leakage should occur(UNI 11292, 7.2);

Hand pump for re lling the fuel tank when the supply point is at a height above 1.5 meters or exceeding 50 litersof capacity (UNI 11292, 7.3).


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The pumping sets are equipped by: gate valve and eccentric taper pipe with controlled angle on the pump suction

(10.6.2.1);

tapered tting pipe on the pump discharge (10.5); anti-vibration expansion joints on the largest side of the tapered pipes on both

suction and discharge sides of the pumps; check valve and gate valve on the discharge line per each pump; vacuum gauge at the pump inlet (10.5) and glycerin lled pressure gauge on

discharge downstream of the check valve (15.7.1) with 16 bar scale quadrant(15.7.1);

pressure switch on the pump discharge for detection of delivered pressure(10.8.6.1);

by-pass output to avoid overheating of the pump in case of operation againstclosed valve (10.5);

drain test valve on the pump discharge, according to the norm schematics

(Figure 6, rif. 1); DN 50 plug for the connection to the pump discharge of the priming tank, if any

(10.6.2.4, table 15); pump starting device (Figure 6, rif. 10) made by a single piece item with built-in

functions; Connection for the water supply of the pump room sprinkler installation (10.3.2.); one or two diaphragm pressure tanks, pre-loaded for the automatic operation of

the pressure maintenance pump; ow rate test loop with ow meter and throttling (8.5, 8.5.1.b).

The measuring of performance supposed during system commissioning and periodi-cal maintenance routines (20.3.2.5, 20.3.4.2), consists of the combination of vacuumand pressure gauges (see above) and a ow rate test loop, complete with direct-rea-ding meter and throttling valve, which con guration allows to measure the design

ow rate under adequate measurement accuracy ( 5%) and without draining thesystem.

According to instructions from the standard, the pumping set may be supplementedby: timer for automatic stop of the duty pumps, for hose reels and hydrants systems

(UNI 10779, A.1.2); Remote signaling alarm units comprising a battery for operating autonomy of 20

hours, to be installed in manned premises (10.8.6.2, 10.9.11), with siren and lightsof the conforming colours, to be connected to the control panels of duty pumps,for alarm signal in case of pumps starting (10.8.6.1) and/or lack of power orphase;

set of spare parts for the diesel engine (10.9.12).

Tapered piping and parts on suction side

Pump starting device

Priming connecion

Flow rate test loop

Fuel tank Hand pump for fuel tank re lling Remote signaling alarm unit


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