STOKVIS ENERGY SYSTEMS ECONOBOOST EBII, ECONOBOOST EBIII Technical Documentation Manual

ECONOBOOST EBII & EBIII

COLD WATER BOOSTER SETS

TECHNICAL

DOCUMENTATION

STOKVIS ENERGY SYSTEMS

96R WALTON ROAD
EAST MOLESEY
SURREY
KT8 0DL
TEL: [phone]
FAX: [phone]
E-MAIL: [e-mail]
WEBSITE: www.stokvisboilers.com

Ebt JUNE 1998

EB II & EB III ECONOBOOST Cold Water Booster Sets .
Stokvis EB II twin pump & EB III triple pump cold water booster units meet today’s

need for compact, reliable, high performance equipment with modest capital and
running costs.
Both units incorporate well proven high specification components , in conjunction
with compact horizontal multistage pumps and a high specification control panel.
Type EB II & EB III units comprise two or three quiet running fixed speed pumps,
together with a diaphragm vessel, mounted on a steel base plate, pre-piped and
pre-wired to the unit control panel to form a fully packaged unit.

Design Features Applications

Compact design Water supply for:­Quiet / Smooth operation Residential
Wide performance range Offices
Extended by duty/assist operation Factories
Easy installation and minimal Hospitals
maintenance requirements Nursing Homes
Quality controlled manufacturing Hotels
and material standards ensure Leisure complexes
optimum performance and long life Supermarkets
Economic capital / running costs Shopping Centres
Water Bye law compliance Schools
CE marked Universities
Horticultural
Irrigation

1

Stokvis Econoboost EB II & EB III Standard Specification
Pumps - High efficiency, quiet running, horizontal, multistage design with

TEFC motors having class ‘F’ insulation and sealed for life bearings, for single
or three phase supply.
Model MS - Cast Iron body with stainless steel shaft and impellers (IP44
motor)

Model SS - All stainless steel construction ( IP55 motor ).
Control Panel - designed to meet IEE wiring regulations 16th Edition

Single compartment heavy gauge steel enclosure to IP55 with door
interlocked 4 pole mains isolator.
Individual direct-on-line motor starters with thermal overload relays (with
single phasing protection for 3 phase units).
Minimum run timer for each pump.
Automatic duty sequence share facility.
Individual pump and control circuit fuses (HRC to BS88) in fully shrouded fuse
holders.
Mains on indicating lamp (Neon).
Run / trip indicating lamps (Neon) each pump.
Panel anti condensation heater (export units).
Special disconnect link terminals are provided to inhibit pump and auto duty
change operation.
External identification and warning labels.
Terminals and gland plate for external connections.
Wiring in stranded PVC cable fitted with ferrules and identification numbers,
run in slotted trunking.

Diaphragm Vessel( WRC listed ), pressed steel welded shell with internal
food quality removable butyl rubber diaphragm. Fitted with Schrader valve,
isolating valve and drain cock.
Unit Base plate - Heavy gauge zinc plated steel. All fasteners ISO metric
threads, zinc plated.
Valves & Pipework - Isolating valves (each pump inlet and outlet)
dezincification resistant copper alloy screwed gate valves BS5154 series B or
dezincification resistant full bore ball valves rating PN20.
Non return valves (each pump outlet) - Gunmetal, non concussive type
resilient seating.
Inlet and delivery manifolds with branches to each pump and vessel. Either
Galvanised mild steel to BS1387 with BSP female termination’s or Copper
tube to BS2871 Table `X’ female tube socket termination’s.
Pressure Gauge & Switches -A 100mm diameter direct mounted pressure
gauge to BS 1780 Class 1 indicates discharge pressure in bar and PSIG. Two
heavy duty diaphragm type pressure switches with copper alloy media contact
parts, adjustable range, mounted on a common header complete with
isolating valve.
Refer to separate data sheet for electrical details and noise levels.

2

Econoboost Unit Operation.

Draw off of water from the system is initially supplied from the vessel, the
resulting fall in pressure being sensed by the pressure controls. When the
pressure has fallen to the nominal system pressure the duty pump is started.

Water is pumped to the distribution system and at the same time into the
vessel causing the gas to be compressed and the pressure to rise.
When pressure has risen to the cut-out point (which is selected to suit pump
and system characteristics) the pump stops.

As long as the demand for water continues the cycle repeats, however should
the demand exceed that which can be fulfilled by the duty pump, pressure will
fall causing the second pump to start which then supplies the system and
creates a pressure rise, this sequence repeats for the third pump (if fitted),
thus providing automatic operation of the assist/standby pump(s).

When pressure has risen to the cut-out point, the pumps are stopped in
sequence, providing the minimum run timers have elapsed.

Units incorporate automatic duty sharing as standard where the pump
sequence is rotated after each run. To avoid excessive pump and control gear
wear, these units incorporate minimum run timers in the control system to limit
the starting frequency. This results in the pump closed valve pressure (plus
any inlet pressure) being applied to the system during low demand periods; all
components in the distribution system must therefore be selected with this in
mind.

Econoboost Selection.
In order to select an Econoboost unit , first of all decide on either the

Econoboost II with 2 pumps or the Econoboost III with 3 pumps
Decide how many pumps are to be used do meet the duty (duty/assist)and if
one or more are to be for standby.
Next establish the water flow rate and the nominal boost pressure required
from the Econoboost.
Divide the required water flow rate by the number of duty/assist pumps to give
the individual pump flow rate.
The nominal boost pressure is the pressure required from each duty/assist
pump.
Refer to the individual pump performance curves for either stainless steel
(SS) or cast iron (MS) to select the correct model .Always select a pump with
at least 8 mwg from the selection point on a pump curve to the closed valve
head of the pump to ensure correct operation.
Example :A 3 pump unit is required with 2 of

the pumps to meet the duty
(duty/assist) and 1 as standby .The unit is to pump potable water.
Water flow rate required 8 m3/hr , Nominal boost pressure 30 m
The correct selection would be an Econoboost III SS2.40

3

Optional Extras

Low water pump cut off and warning lamp complete with electrodes or
pressure switch control.
Two way selector switch for low water cut off (where twin suction tanks are
used) complete with 3 additional electrodes.
Volt free BMS monitoring contacts for run / trip / low water indication.
Resilient mountings.
Flexible pipework bellows connections.
Pressure reducing valves to enable constant supply pressure to be
maintained.
Individual vessel hydraulic test certificate.

4

Individual Pump Performance Curves For Stainless Steel Pumps.

5

Individual Pump Performance Curves For Stainless Steel Pumps.

6

Individual Pump Performance Curves For Cast Iron Pumps.

7

Individual Pump Performance Curves For Cast Iron Pumps.

8

Econoboost Cold Water Booster Technical Data

Note: All details are per pump - All pumps can start and run together.
220-240/ 1 / 50 Supply 380-415/ 3 / 50 Supply Mean Sound Pressure
Input Full load Starting Input Full load Starting Level @ 1 metre (dB(A))
Power Current Current Power Current Current
O

ne Two Three

Unit size (Watts) (Amps) (Amps) (Watts) (Amps) (Amps) Pump Pumps Pumps
MS1.30 530 2.6 10.5 460 1.1 6.6 56 59 61

MS1.40 600 2.9 10.5 620 1.2 6.6 56 59 61
MS1.50 710 3.3 10.5 690 1.4 6.6 56 59 61
MS1.60 840 3.8 13.0 880 1.5 6.6 56 59 61

MS2.20 570 2.7 10.5 530 1.2 6.6 56 59 61
MS2.30 770 3.6 10.5 720 1.4 6.6 56 59 61
MS2.40 1010 4.7 13.0 920 1.7 6.6 56 59 61
MS2.50 1250 5.8 26.7 1160 2.1 15.0 56 59 61
MS2.60 1410 6.5 26.7 1360 2.4 15.0 56 59 61

MS3.20 730 3.2 11.0 720 1.4 6.6 56 59 61
MS3.30 1080 5.1 13.0 1120 2.0 10.5 56 59 61
MS3.40 1350 6.2 26.5 1370 3.1 16.0 56 59 61
MS3.50 1830 8.4 29.0 1710 3.4 16.0 65 68 70
MS3.60 2000 9.5 29.0 2080 3.7 22.0 65 68 70

MS4.20 1170 5.5 13.0 1170 2.1 10.5 56 59 61
MS4.30 1510 7.1 26.7 1550 2.8 15.0 56 59 61
MS4.40 2310 10.9 35.0 2300 4.1 22.0 65 68 70
MS4.50 2810 12.6 35.0 2810 5.1 33.0 65 68 70
MS4.60 ---- ---- ---- 3400 6.0 33.0 65 68 70

SS 1.20 450 2.4 10.0 350 0.8 5.2 56 59 61
SS 1.30 540 2.6 10.0 480 1.0 5.2 56 59 61
SS 1.40 640 2.9 10.0 620 1.1 5.2 56 59 61
SS 1.50 800 3.5 11.0 820 1.5 7.6 56 59 61
SS 1.60 940 4.0 11.0 950 1.6 7.6 56 59 61

SS 2.20 590 2.7 10.0 550 1.0 5.2 56 59 61
SS 2.30 820 3.6 10.0 800 1.4 5.2 56 59 61
SS 2.40 1040 4.5 13.0 1080 1.8 7.6 56 59 61
SS 2.50 1420 5.7 13.0 1330 2.3 10.5 56 59 61
SS 2.60 1510 6.8 26.5 1630 2.7 10.5 56 59 61

SS 3.10 730 3.2 11.0 720 1.4 7.6 56 59 61
SS 3.15 1080 4.6 13.0 1120 2.0 10.5 56 59 61
SS 3.20 1350 6.2 26.5 1370 3.1 16.0 56 59 61
SS 3.25 1830 8.2 29.0 1710 3.4 16.0 65 68 70
SS 3.30 2230 9.2 29.0 2080 3.7 22.0 65 68 70

SS 4.10 1170 4.9 13.0 1170 2.0 10.5 56 59 61
SS 4.15 1510 6.6 25.0 1550 2.8 16.0 56 59 61
SS 4.20 2310 10.1 35.0 2300 4.1 22.0 65 68 70
SS 4.25 2700 11.7 35.0 2710 5.0 33.0 65 68 70
SS 4.30 ---- ---- ---- 3310 6.0 33.0 65 68 70

9