Catalog
KRAL Pump Stations.DKC/DMC Series.
DKC/DMCEdition 10/2010
2 DKC/DMC Edition 10/2010 Catalog
Table of contents
KR
AL
Pum
p S
tatio
ns –
DK
C/D
MC
Ser
ies
Description
□ Structure 5
□ Function description 6▪ Functional principle 6▪ Reversing valve 6▪ Expansion valve 6▪ Pressure measurement 6▪ Protection against soiling 7
□ Type code 8
Technical data
□ Operational limits 9
□ Materials 9
□ Required NPSH values 10▪ Internal pressure loss of the pump
station 11
□ Weight tables 12▪ Weight tables pump 12▪ Weight table pump station 12▪ Filling volume 13
□ Noise levels 13
Dimensions
□ Dimensions DKC 15
□ Dimensional drawings DKC 15▪ Pump station DKC Standard 15▪ Pump station DKC with two-way valve 17▪ Pump station DKC with base frame with
oil pan 18▪ Pump station DKC with two-way valve
and base frame with oil pan 20
□ Dimensions DMC 21
□ Dimensional drawings DMC 21▪ Pump station DMC Standard 21▪ Pump station DMC with two-way valve 22▪ Pump station DMC with base frame with
oil pan 23▪ Pump station DMC with two-way valve
and base frame with oil pan 24
Options
□ Overview 25
□ Two-way valve 26▪ Limit switch 26▪ Actuators 27
□ Pressure maintaining valve 28
□ Pressure switch 29▪ Specifications of the pressure switch 29
□ Differential pressure monitoring at the strainer 30▪ Specifications of the differential pressure
indication 30
□ Temperature monitoring 31
□ Strainer cover protection 31
□ Oil leakage monitoring 32
□ Pump change-over device 33
□ Mounting 34
□ Built-on Volumeter OMA 34
□ Heating system 35▪ Electric heating system 35▪ Fluid heating system 37▪ Special heating system 37
General drawings
□ General drawings 39
□ Spare parts 44
Catalog DKC/DMC Edition 10/2010 3
4 DKC/DMC Edition 10/2010 Catalog
Structure
Des
crip
tion
Description Structure
Fig. 1 Station structure
1 Station block
2 Hoisting eye3 Suction-side pressure gauge4 Strainer cover
5 Pressure-side pressure gauge
6 Reversing valve lever7 Vent valve
8 Pump
9 Pressure connection10 Suction connection
Station block sizes Terms used
Station with pump sizes K 5–42 / M 5–54 Small pump station
Station with pump sizes K 55–118 Large pump station
Fig. 2 Hydraulic scheme
1
2
3
4
5
6
3
7
8
2
9
10
PIPI
PIPI
PIPI
M
M
LFOLFO
HFOHFO
Suction SideSuction Side
Pressure SidePressure Side
TITI
TITI
Catalog DKC/DMC Edition 10/2010 5
Function description
Des
crip
tion
Function description
Functional principle
The pump stations of the DKC/DMC series are suitable for the parallel operation of two KRAL pumps of the M or K series.The station is connected to the piping system by means of the suction connection 10 at the front of the
station. Depending on the position of the reversing valve 6, the left-hand, the right-hand or both strainers are connected to the suction connection. The pumped liquid flows through the strainer from top to bot-tom and thus reaches the suction connection of the attached pumps. There the pressure of the pumped
liquid is increased which finally returns to the station through the pressure connection of the pump. The liquid flows through a return valve in an integral duct into the lower part of the station and via the rever-sing valve to the pressure connection 9, through which the liquid leaves the station again.
Reversing valve
In order to ensure a uniform distribution of the operating hours, an interval-controlled automatic switch-over between the two pumps is also possible in this valve position. The return valves ensure that the
respective pump that is stopped does not begin to rotate backwards.
Expansion valve
The liquid volume in the respectively blocked line of the station could result in an impermissibly high inner pressure due to heating up through thermal expansion. In order to prevent this, the cylinder of the reversing valve contains two small spring expansion valves that vent any overpressure in the respec-
tively active line of the station.
Pressure measurement
A pressure gauge 5 is located in the center of the station in order to monitor the delivery pressure. The pressure gauge is always connected to the pressure side of the station and is thus independent of the position of the reversing valve 6. In order to monitor the pressure on the suction sides of the two pumps,
two further pressure gauges 3 are mounted. These pressure gauges show only the respective pressure at one of the two strainers and can be used to monitor the degree of soiling of the strainers. The pres-sure gauge in the blocked line shows only the inner pressure of the blocked strainer. The stopcocks at
the pressure gauges may only be opened to read the pressure values.
If the reverseing valve lever 6 is in one of the two
side positions, the respectively other line of the station is separated from the liquid circuit so that the strainer of this line can be opened and clea-
ned. If the lever is in the center position, both lines are connected to the liquid circuit. The deli-very rate can thus be increased through parallel
operation of the two pumps. If only one pump is being operated, the second pump can be cut in automatically if the delivery rate or the pressure
drops at the active line.Fig. 3 Positions of the reversing valve
6 DKC/DMC Edition 10/2010 Catalog
Function description
Des
crip
tion
Protection against soiling
The station is equipped by default with strainers. These strainers are designed to separate soiling that is normally not contained in the pumped liquid. Due to their small size the strainers cannot separate larger amounts of soiling occurring regularly, nor abrasive fine particles. If such operating conditions occur, the
station has to be protected additionally by a correspondingly dimensioned operating filter. Very fine abrasive particles cannot be held back by the operating filter and result in increased wear to the pumps.As an alternative the strainer can be replaced during commissioning by a fine-meshed commissioning
strainer. The commissioning strainer can be ordered at KRAL. A further possibility is the use of an exter-nal commissioning filter.The strainer inserts 2 are metallic and can be removed, cleaned and re-used after the strainer cover 1
has been opened.
Tab. 1 Strainer/filter and mesh widths
1 Strainer cover
2 Strainer insert
Options Usage Viscosity
[mm2/s]
Mesh width
[mm]
□ Strainer Separation of coarse soiling during operation
< 20 0.25
> 20 0.50
□ Commissioning strainer
Protection of the station during commissioning — 0.02
□ Commissioning filter
Protection of the station during commissioning — 0.02
□ Operating filter Protection of the station during operation depending on pumped liquid
1
2
Catalog DKC/DMC Edition 10/2010 7
Type code
Des
crip
tion
Type code
Tab. 2 Type code
1 Model
2 Size3 Seal type4 Pressure stage
5 Two-way valve6 Heating system7 Version index
Item Designation Type
1 Model DKC: Pressure build-up up to 16 bars
DMC: Pressure build-up up to 40 bars
2 Size Corresponds to flow rate in [l/h] at motor speed
3 Seal type A: Standard mechanical seal
B: Mechanical seal of hard material
C: Standard radial shaft seal
D: Magnetic coupling
E: Mechanical seal with quench
F: Radial shaft seal, high-temperature model
X: Special seal
4 Pressure
maintaining valve
A: Without pressure maintaining valve
B: Internal pressure maintaining valve, pressure stage 2–9 bars
C: Internal pressure maintaining valve, pressure stage 6–25 bars
D: Internal pressure maintaining valve, pressure stage 15–40 bars
E: External pressure maintaining valve, pressure stage 2–9 bars
F: External pressure maintaining valve, pressure stage 6–25 bars
G: External pressure maintaining valve, pressure stage 15–40 bars
5 Two-way valve A: Without suction-side two-way valve
B: Suction-side two-way valve, manually operated
C: Suction-side two-way valve, manually operated and limit switch
D: Suction-side two-way valve, electrically operated and limit switch
E: Suction-side two-way valve, pneumatically operated and limit switch
6 Heating system A: Without heating system
B: Electric heating system in the block
C: Fluid heating system in the block
D: Electric heating system in the block and at the pumps
E: Fluid heating system in the block and at the pumps
7 Version index For internal administration
DKC- 2400.BBBA.00002
1
2
3
4
5
6
7
8 DKC/DMC Edition 10/2010 Catalog
Operational limits
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Technical data Operational limits
Materials
DKC DMC
Operating pressure max. [bar] 16 40
Temperature max. [°C] 180 180
Temperature min. [°C] for pump materials –20 –20
Viscosity [mm2/s]min.–max. 2–10000 2–10000
Feed pressure max. [bar] 6 6
DKC DMC
Material name Material no. Material name Material no.
Station block
Housing EN-GJS-400-15 EN-JS1030 EN-GJS-400-15 EN-JS1030
Strainer cover S235JR 1.0037 S235JR 1.0037
Pump
Housing
□ Standard EN-GJS-400-15 EN-JS1030 ENAC-AlSi10Mg —
□ Marine design — EN-GJS-400-15 EN-JS1030
Screw set 16MnCrS5 1.7139 16MnCrS5 1.7139
Flange cover
□ Standard EN-GJS-400-15 EN-JS1030 ENAC-AlSi10Mg —
□ Marine design — EN-GJS-400-15 EN-JS1030
Bearing cover — EN-GJS-400-15 EN-JS1030
End cover EN-GJS-400-15 EN-JS1030 EN-GJS-400-15 EN-JS1030
Catalog DKC/DMC Edition 10/2010 9
Required NPSH values
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Required NPSH values
The following table shows the required NPSH values to ensure that the various pump sizes can be ope-
rated without cavitation. These values are derived from the pump kinematics during operation with a low-volatility pumped liquid such as lubricating oil or hydraulic fluid. The following examples indicate that when pumped liquids have a readily volatile component content
the required NPSH values notably increase:
□ Fuel oil requires an NPSH value of at least 6 mWC.□ When the pumped liquid contains water (e.g. heavy fuel oil), the values in the table have to be incre-
ased by the vapor pressure of the water at the specified operating temperature.
The required NPSH value also needs to be increased if there are gas contents, regardless of whether it is dissolved or not. If in doubt, please contact KRAL.
Tab. 1 Required NPSH values for K-pump
Pump size Viscosity Rotation [min-1] Pump size Viscosity Rotation [min-1]
[mm2/s] 1450 1750 2900 3500 [mm2/s] 1450 1750 2900 3500
NPSH value [mWC] NPSH value [mWC]
K 5 6 2 K 42 6 2 2.3
37 2 37 2 2.1 2.6
152 2 152 2 2.8 3.5
380 2 380 2.5 2.7 4 4.8
K 7.5 6 2 K 55 6 2
37 2 37 2 2.7
152 2 152 2.1 2.8 3.3
380 2 2.3 2.6 380 2.5 2.7 3.5 4.0
K 10 6 2 74 6 2 2.6 3.0
37 2 37 2 2.9 3.4
152 2 2.3 152 2.3 2.5 3.3 4.1
380 2 2.6 3.1 380 2.7 3.0 4.4 5.0
K 15 6 2 K 85 6 2 2.8 3.4
37 2 37 2 3.1 3.8
152 2 2.2 152 2.4 2.6 3.8 4.6
380 2 2.7 3 380 2.8 3.1 4.6 5.8
K 20 6 2 K 105 6 2 2.7 3.2
37 2 37 2 2.2 3 3.6
152 2 2.4 2.7 152 2.4 2.6 3.6 4.4
380 2.2 2.4 3.2 3.8 380 2.8 3.1 4.4 5.4
K 32 6 2 K 118 6 2 3.1 3.9
37 2 37 2.2 3.5 4.4
152 2 2.3 2.6 152 2.5 2.8 4.3 5.4
380 2.2 2.4 3.1 3.7 380 3 3.3 5.3 6.8
10 DKC/DMC Edition 10/2010 Catalog
Required NPSH values
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Tab. 2 Required NPSH values for M-pump
Internal pressure loss of the pump station
When determining the NPSH value of the pump station also take into account the internal pressure losses in the ducts of the station, in the reversing valve and particular in the strainer. The following dia-gram shows as an example the overall pressure loss from the suction connection of the station up to the
suction flange of the pump at operation with a clean strainer.
Pump size Viscosity Rotation [min-1] Pump size Viscosity Rotation [min-1]
[mm2/s] 1450 1750 2900 3500 [mm2/s] 1450 1750 2900 3500
NPSH value [mWC] NPSH value [mWC]
M 5 6 2 M 26 6 2 2.2 2.7
37 2 37 2 2.2 2.7
152 2 152 2 2.9 3.5
380 2 380 2.3 2.6 3.9 4.8
M 7.5 6 2 M 32 6 2
37 2 37 2
152 2 152 2 2.3 2.7
380 2 2.3 2.5 380 2,1 2.2 3 3.5
M 10 6 2 M 42 6 2 2.2 2.7
37 2 37 2 2.2 2.7
152 2 2.3 152 2 2.9 3.5
380 2 2.1 2.3 2.5 380 2,3 2.6 3.9 4.8
M 15 6 2 M 54 6 2 2.1 3 3.7
37 2 37 2.1 2.3 3.4 4.2
152 2 2.2 152 2.5 2.7 4.1 5.1
380 2 2.6 2.9 380 3 3.3 5 6.3
M 20 6 2 2.1
37 2 2.1
152 2 2.4 2.8
380 2.1 2.3 3.1 3.7
∆p Pressure lossQ Delivery rate
0,00
0,02
0,04
0,06
0,08
0,10
0,12
0 20 40 60 80 100 120
∆p [b
ar]
ν ≈ 14 mm²/s
Q [l/min]
Catalog DKC/DMC Edition 10/2010 11
Weight tables
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Weight tables
Weight tables pump
Tab. 3 Weights K- and M-Pumps and motors
Weight table pump station
Tab. 4 Weights for pump station
Mot
or s
ize
Mot
or w
eigh
t
[kg
]
K 5K 7.5K 10
K 15K 20
K 32K 42
K 55K 74K 85
K 105K 118
M 5M 7.5M 10
M 15M 20M 26
M 32M 42M 54
Weight of pump with free shaft end [kg]
Steel Alu Steel Alu Steel
8 10,5 21,5 4,5 5 9,5 11 15
Weight of pump bracket with coupling and screws [kg]
71 8 — 3,5 —
80 10 3,5 5 7 9
90S 12 3,5 6 7 7
90L 14 3,5 6 7 7
100L 21 4,5 3 — 10 10
112M 28 — 3 — 10 10
132S 39 — 4 — 12 12
132M 45 — 4 — 12 12
160M 110 — 5,5 —
160L 120 — 5,5 —
Part Weight [kg] for pump station with pump sizes
K 5–42 / M 5–54 K 55–118
Station block with strainer and reversing valve 58 90
Internal pressure maintaining valve 1.3 1.9
External pressure maintaining valve 13 16.5
Two-way valve, manually operated 8.1 14
Actuator, electrical 7.3 7.3
Actuator, pneumatic 5.8 5.8
Differential pressure indication 2.2 2.3
Base frame with oil pan 21 26
Counter flanges, 2 pc. 2.3 2.6
Pump with coupling and motor See weight tables pump
12 DKC/DMC Edition 10/2010 Catalog
Noise levels
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Filling volume
Tab. 5 Filling volume of the station block
Noise levels
Tab. 6 Noise levels
Pump station with pump sizes
K 5–42 / M 5–54 K 55–118
Filling volume of the station block [l] 8 13
Noise level max. ±3 [dB(A)]
1 Pump 2 Pumps Motor 1 Pump + 1 Motor 2 Pumps + 2 Motors
K 5 – 42 56 59 57 60 63
K 55 – 118 61 64 65 67 70
M 5 – 54 59 62 69 70 73
Catalog DKC/DMC Edition 10/2010 13
14 DKC/DMC Edition 10/2010 Catalog
Dimensions DKC
Dim
ensi
ons
Dimensions Dimensions DKC
Dimensional drawings DKC
Pump station DKC Standard
Tab. 1 Pump sizes K 5 – 42
Station size
DKC
Pump size Motor
size
DNs /
DNd
H1 H2 B1 B2 B3 B4
[mm] [mm] [mm] [mm] [mm] [mm]
240 – 2400 K 5 – 20 71
SA
E 1
1/2
"
3000
PS
I
590 682 561 382 437 534
80 645 737 604 398 453 541
90 688 780 618 405 460 558
1600 – 5000 K 32 – 42 80 651 743 637 410 465 562
90 694 786 651 417 472 569
100/112 755 847 707 438 493 590
3000 – 13000 K 55 – 118 90
SA
E 2
"
3000
PS
I 756 848 715 473 548 627
100/112 817 909 771 494 569 648
132 940 1032 807 508 583 662
100M16
117
132
B1
B2
281
DNs
DNd45 125 20
5
244
H1
Catalog DKC/DMC Edition 10/2010 15
Dimensional drawings DKC
Dim
ensi
ons
Tab. 2 Pump sizes K 55 – 118
305
H1
DNs
DNd
148
45
248
5010
8
140
85M16
347
B1B
2
16 DKC/DMC Edition 10/2010 Catalog
Dimensional drawings DKC
Dim
ensi
ons
Pump station DKC with two-way valve
Tab. 3 Pump sizes K 5 – 42
Tab. 4 Pump sizes K 55 – 118
DNd55 125 20
5
DNsDNs
336
B1
50
250
B3
DNd
148
15
248
DNsDNs
B1
422
280
B3
60
Catalog DKC/DMC Edition 10/2010 17
Dimensional drawings DKC
Dim
ensi
ons
Pump station DKC with base frame with oil pan
Tab. 5 Pump sizes K 5 – 42
DNs
DNd
90
217 29
7
18
270500
H2
336
600
130
B1
550500
B4
18 DKC/DMC Edition 10/2010 Catalog
Dimensional drawings DKC
Dim
ensi
ons
Tab. 6 Pump sizes K 55 – 118
397
H2
DNs
DNd
340
240 34
0
10018
600
600660
132
700
B4
B1
Catalog DKC/DMC Edition 10/2010 19
Dimensional drawings DKC
Dim
ensi
ons
Pump station DKC with two-way valve and base frame with oil pan
Tab. 7 Pump sizes K 5 – 42
Tab. 8 Pump sizes K 55 – 118
DNsDNs
600
250
B1
550
500B
412
5 DNd
50090
18
297
270
2175
DNd 340
100600
18
340
240
15DNsDNs
660
B1
600
700
B4
117
20 DKC/DMC Edition 10/2010 Catalog
Dimensions DMC
Dim
ensi
ons
Dimensions DMC
Dimensional drawings DMC
Pump station DMC Standard
Tab. 9 Pump sizes M 5 – 54
Station size
DMC
Pump size Motor
size
DNs /
DNd
H1 H2 B1 B2 B3 B4
[mm] [mm] [mm] [mm] [mm] [mm]
240 – 1200 M 5 – 10 71
SA
E 1
1/2
"30
00 P
SI
578 670 592 393 448 545
80 635 727 635 410 465 562
90 678 770 649 417 472 569
800 – 2600 M 15 – 26 80 694 786 637 410 465 562
90 737 829 651 417 472 569
100/112 781 873 707 436 493 590
1600 – 6500 M 32 – 54 80 694 786 637 410 465 562
90 737 829 651 417 472 569
100/112 781 873 707 436 493 590
132 908 1000 744 451 506 604
B1
B2
281
100M16
117
132
244
H1
DNs
DNd45 125 20
5
Catalog DKC/DMC Edition 10/2010 21
Dimensional drawings DMC
Dim
ensi
ons
Pump station DMC with two-way valve
Tab. 10 Pump sizes M 5 – 54
DNd55 125 20
5
DNsDNs
336
50
B1
250
B3
100M16
117
13224
4H
1
22 DKC/DMC Edition 10/2010 Catalog
Dimensional drawings DMC
Dim
ensi
ons
Pump station DMC with base frame with oil pan
Tab. 11 Pump sizes M 5 – 54
H2
336
DNs
DNd
217
90
297
18
270500
500
600
130
B1
550
B4
Catalog DKC/DMC Edition 10/2010 23
Dimensional drawings DMC
Dim
ensi
ons
Pump station DMC with two-way valve and base frame with oil pan
Tab. 12 Pump sizes M 5 – 54
DNd
90500
27018
217 29
75DNsDNs
500
600
B1
550
250
B4
125
24 DKC/DMC Edition 10/2010 Catalog
Overview
Opt
ions
Options Overview
Option Option
Two-way valvepage 26
Temperature monitoringpage 31
Limit switchpage 26
Strainer cover protection page 31
Electrical actuatorpage 27
Oil leakage monitoringpage 32
Pneumatic actuatorpage 27
Pump change-over devicepage 33
Internal pressure maintaining valve
page 28
Mountingpage 34
External pressure maintaining valvepage 28
Built-on volumeter OMApage 34
Pressure switchpage 29
Electric heating systempage 35
Differential pressure monitoringpage 30
Fluid heating systempage 37
Betrieb
ausein
Prüfen
Alarm
Alarmton
Entriegeln
Pumpe 1 Pumpe 2
Alarm
Betrieb Störung Betrieb Störung
Pumpen - Steuerung
Entriegelung Entriegelung
Aus
Pumpe 1 Pumpe 1 Pumpe 2 Pumpe 2
Pumpe 1 Pumpe 2
Catalog DKC/DMC Edition 10/2010 25
Two-way valve
Opt
ions
Two-way valve
A two-way valve 2 is available at the suction-side SAE connection as an option. This allows the station
to be connected to two piping systems with different pumped liquids. When the lever 1 is moved by 90°, the system switches over between the two suction-side connections of the two-way valve.
Limit switch
As an additional option, a limit switch 3 that is used to monitor the lever position at the two-way valve
remotely is available.
Positions of the two-way valve
1 Two-way valve lever2 Two-way valve
Connection assignment
1 Two-way valve lever2 Two-way valve3 Two-way valve limit switch
1
2
3
2
1
PNP Gnd
B+U 10 - 30V DC
Signal
braun / brown
schwarz / black
blau / blue
26 DKC/DMC Edition 10/2010 Catalog
Two-way valve
Opt
ions
Actuators
In order to operate the valve automatically, an electrical or pneumatic actuator can be installed.
Electrical actuator
Pneumatic actuator
Connection assignment
2 Compressed-air connection
202225
101112
123
4
5
Kondensator
Temperaturwächter
Auf
Wegschalter
Zu
Heizwiderstand
Zus. Wegschalter
Zu
Condenser
Temperature control
Open
Way switch
Close
Heating resistor
Add. Way switch
Close
6
Auf / Open
AufOpen
ZuClose
Zu / Close 1-ph AC
4
2
Catalog DKC/DMC Edition 10/2010 27
Pressure maintaining valve
Opt
ions
Pressure maintaining valve
An internal pressure maintaining valve 1 can be installed optionally in order to ensure a constant supply pressure even when the liquid requirement of the system varies. The valve is mounted in a vertical duct between the suction and the pressure connection of the station. A spring-loaded cylinder opens a
bypass between the pressure and suction sides when the setpoint pressure is exceeded. In this manner the free cross-section and thus the overflowing volume flow is controlled so that the delivery pressure remains constant to a great degree.
A further option is an external pressure maintaining valve 2 for mounting to the pressure connection of the station block. At this valve the overflowing flow rate is not supplied directly to the suction end as at an internal valve, but rather directed outwards via an additional flange connection. We recommend this
constellation if overheating of the station block would be caused by large overflow amounts or if highly volatile liquid components could arise through the pressure reduction during overflowing of outgassing or evaporation. Usually in these cases the overflowing amount is directed to a degassing vessel or
reservoir and then returned from there to the suction line or the feeder reservoir.
Pressure peaksAs a mechanical regulating valve the pressure maintaining valve has a certain sluggishness. Brief pres-sure peaks can therefore arise at rapid flow rate changes (such as the use of quick-acting valves, star-ting of the pump without soft start) and stiff piping systems. If this may result in operating problems or
damage to the system components, a pulsation damper can be installed into the piping system. As an alternative such a pulsation damper can also be mounted directly on the pump station. This pulsation damper is available from KRAL.
1 Internal pressure maintaining valve 2 External pressure maintaining valve
12
28 DKC/DMC Edition 10/2010 Catalog
Pressure switch
Opt
ions
Pressure switch
Specifications of the pressure switch
It is optionally possible to install a pressure
switch 1 on the bottom of the station as an additional pressure monitoring device.
1 Pressure switch
Figure Criterion Data
Dimensions Sensor:
Measuring range:Output:
Differential gap:Repeatability:Operating temperature:
Fluid temperature:Storage temperature:Degree of protection:
FKM-Membrane
1 – 16 barFloating change-over contact
big; not adjustable±0,5...±2,0 % FS typ.0...+80 °C
0...+80 °C-40...+80 °CIP65*
A Pressure connection * only if female connector is mounted according to instructions
Pressure connection Differential gap approx.*:
Operating pressure max.:Pressure connection:Tightening torque:
0.4 – 1.7
200 barG1/4"; female32 – 40 Nm
A Pressure connection * depending on the preset value
Electrical connection Male plug:
Female connector: - Cable-ø: - Terminal screws:
MicroswitchRating AC:
Rating DC:
Resistance of insulation:Electric strength:
Mechanical lifetime:
DIN43650-A
6...13 mm4 x 0.5...1.5 mm2
250 V 10 (3) A
250 V 0.1 (0.05) A220 V 0.25 (0.2) A110 V 0.5 (0.3) A
24 V 2 (1) A> 2 MW2 kV terminal ground
1 Mio. cycles
1
A
A
Catalog DKC/DMC Edition 10/2010 29
Differential pressure monitoring at the strainer
Opt
ions
Differential pressure monitoring at the strainer
Specifications of the differential pressure indication
In order to monitor the differential pressure at the strainers, a differential pressure indication can be established. Monitoring on the
corresponding site can be activated or deactivated by opening or closing the ball valves 2 on one side of the pump station. An
optical display 1 or also electrical contacts can be used as monitoring organs. Electrical contact:By means of the movement of the piston stroke the red segment of the indicator disc is visible over a pressure range equal to 20–100 % of the
differential pressure. The first reed contact is actuated at 75 %, and the second at 100 % of the differential pressure.
Visual indicator:The red colour of the indicator disc becomes more intense with growing contamination of the
strainer as the differential pressure increases. Detailed documents available on request.
1 Differential pressure indication 2 Ball valve
Data Contact
Electrical data
□ Contacts 1 x NO 1 x NC
□ Load voltage max. [V ] 250 220
□ Frequency max. [Hz] 0...60
□ Switching current max. [A] 1.0 0.8
□ Load capacity max. [W/VA] 60/60 40/60
Operating data
□ Operating pressure max. [bar] 100
□ Operating temperature max. [°C] 150
Differential pressure Δp [bar] 0,5
Material GD-AL
Degree of protection IP 65
Wire connection 1 x Pg 13.5
2
2
1
M20x1,5G1/4
G1/
4
- +
2512
7
G1/
4
- +
1225
7
G1/4
30 DKC/DMC Edition 10/2010 Catalog
Temperature monitoring
Opt
ions
Temperature monitoring
Strainer cover protection
The standard strainer cover can optionally be replaced by special strainer covers with securing unit. When the vent screw 1 is opened, the strainer chamber is vented. This avoids accidents through squir-ting pumped liquid.
In order to monitor the temperature of the pum-
ped liquid, two thermometers 1 that are moun-ted at the station block near the two strainer chambers are available.
1 Thermometer
Detailed view
1 Vent screw
1
1
Catalog DKC/DMC Edition 10/2010 31
Oil leakage monitoring
Opt
ions
Oil leakage monitoring
The leak oil monitoring device consists of the indi-
cation device and a PTC resistor sensor. The indication device contains the components for optical and acoustical alarm indication as well a
potential-free change-over switch for controlling additional signal equipment. When the PTC resis-tor that is heated up in its operating state is
immersed into oil, it cools down, thus triggering an alarm.The leak oil monitoring device is unsuitable for
heavy fuel oil applications.We recommend using the leak oil monitoring device with an elevated oil pan.
1 Operation2 Unlock
3 Alarm4 Check5 Signal
6 Off7 On8 Cable
Technical data
Power supply 230 V AC, 50 Hz, 10 VA
Output □ 1 visual alarm (red light)
□ 1 acoustic alarm, can be switched off (buzzer)
□ 1 potential free change-over switch for external signal max. 230 V AC, 3 A
Operating temperature -5...+40 °C
Housing dimensions 163 x 97 x 62 mm
Protection class II
Degree of protection IP41
Mounting Wall mounting
ϑ
Betrieb
3 m
ausein
Prüfen
Alarm
230 VAC50 Hz
Alarmton
Entriegeln
12345
8
67
32 DKC/DMC Edition 10/2010 Catalog
Pump change-over device
Opt
ions
Pump change-over device
The pump change-over device provides several
functions to control double station pump units. It is unsuitable for heavy fuel oil applications.
Functions:□ Selectable control switch On-Off-P1-P2-
automatic□ Time clock for automatic switch□ Protective motor relay
□ Monitor lamps P1 and P2□ Fault indication□ Fault alarm output for external fault report
□ Automatic switch-over in case of breakdown of pump
□ Connection for pressure control
□ Connection for leak oil monitoring device
Technical data
Supply voltage 220/380 V AC, 50 Hz
Control voltage 220 V AC, 50 Hz
Protective motor range 0.7 – 17 A
Housing material Plastics
Housing dimensions 300 x 250 x 120 mm
Degree of protection IP 54
Mounting Wall mounting
Pumpe 1 Pumpe 2
Alarm
Betrieb Störung Betrieb Störung
Pumpen - Steuerung
Entriegelung Entriegelung
Aus
Pumpe 1 Pumpe 1 Pumpe 2 Pumpe 2
Pumpe 1 Pumpe 2
Catalog DKC/DMC Edition 10/2010 33
Mounting
Opt
ions
Mounting
Mounting types
□ Mounting on base frame with oil pan□ Bracket mounting
Built-on Volumeter OMA
To measure the flow A KRAL Volumeter of the OMA series can be built on the pump station.
Fig. 1 Base frame with oil pan Fig. 2 Bracket mounting
Fig. 3 KRAL Volumeter OMA Series Fig. 4 Pump station with built-on OMA
34 DKC/DMC Edition 10/2010 Catalog
Heating system
Opt
ions
Heating system
The pump stations can be equipped with an optional heating system. We recommend heaters for high-
viscosity liquids that do not flow sufficiently if not heated. This can result in excessive power consump-tion or lead to problems arising through cavitation or sealing.
Method of heating:□ Electric heating system
□ Fluid heating system□ Special heating system
Electric heating system
Operating data:□ Voltage: 230 V
□ Power:▪ Small pump station with pump sizes K 5–42/M 5–54: 800 W▪ Large pump station with pump sizes K 55–118: 2 x 800 W
□ Frequency: 50/60 Hz□ Wire cross-section: 2 x 1 mm²□ Filling volume:
▪ Small pump station with pump sizes K 5–42/M 5–54: 0.40 l
▪ Large pump station with pump sizes K 55–118: 0.12 l per heating duct
Scope of delivery
1 Connecting cable2 Heating element3 Seal ring
4 Screw plug heating element5 Seal ring
Small pump station with pump sizes K 5–42/M 5–54
Large pump stations with pump sizesK 55–118
□ 1 Heating element□ 1 Screw plug
□ 2 Seal rings□ 0.5 l Thermal oil Caldo ISO 32
□ 2 Heating elements□ 2 Screw plugs
□ 4 Seal rings□ 0.25 l Thermal oil Caldo ISO 32
1
2
3
4
5
Catalog DKC/DMC Edition 10/2010 35
Heating system
Opt
ions
In the case of a small pump station the electric heating is installed in a heating duct within the station block. The electric heating for the large pump station consists of two heating elements that are integra-
ted in two heating ducts of the station block.
* Figure 3 shows the large pump station. The small pump station disposes of only one heating duct with
one upper and one lower screw plug each.
The output of the heating element corresponds to the radiation and convection losses of the station in the required temperature range so that overheating is not possible.Heating up of the station block of the small pump station after the steady-state condition has been
reached:
□ Station rear: approx. 60 K□ Station front: approx. 40 K
Fig. 5 Heating duct* Fig. 6 Heating element installation
1 Connecting cable
2 Heating element3 Seal ring4 Screw plug heating element
5 Seal ring
6 Heating duct7 Upper screw plug heating duct*8 Lower screw plug heating duct*
∆t Heating-up time∆T Temperature riseA Station rear
B Station front
Fig. 7 Temperature rise after the heating has been switched on
7
86 6
1
35
2
4
76
0
10
20
30
40
50
60
0 10 20 30 40 50 60Δt [min]
ΔT [K
]
A
B
36 DKC/DMC Edition 10/2010 Catalog
Heating system
Opt
ions
Fluid heating system
In the case of the fluid heating system the heating fluid passes through one or two heating ducts in the
station block. The screw connections required are available from KRAL. When setting the supplied liquid and its temperature observe the respective operating limit values of the station and the attached pumps.
Operating data:□ Maximum pressure: 16 bar
□ Maximum fluid temperature: 180 °C□ Connection:
▪ Small pump station with pump sizes K 5–42/M 5–54:
straight screw connection, outer diameter 28 mm
▪ Large pump station with pump sizes K 55–118: swiveling screw connection, outer diameter 22 mm and
straight screw connection, outer diameter 22 mm
Scope of delivery
Special heating system
If special heating systems are installed, please contact KRAL.
Fig. 8 Fluid heating system for small pump station
Fig. 9 Fluid heating system for large pump station
1 Piping2 Straight screw connection
3 Swiveling screw connection
Small pump station with pump sizes K 5–42/M 5–54
Large pump station with pump sizesK 55–118
□ 2 Straight screw connections
□ 1 Seal ring□ 1 Adapter sleeve
□ 2 Swiveling screw connections
□ 2 Straight screw connections
12 12
3
Catalog DKC/DMC Edition 10/2010 37
38 DKC/DMC Edition 10/2010 Catalog
General drawings
Gen
eral
dra
win
gs
General drawings General drawings
Fig. 1 Station block for pump sizes K 5–42/M 5–54 with pressure maintaining valve closure
300
472
739.3
304
606.3
893
076
739.1
502
405
893
076
739.1
502
405164.1
739.4
739.5165.1
914.1
914.1
611.1606.1
914.1228.1
423 165.2
901.1901.2
611.2611.4
611.3165.2423
228.1
914.1
606.2
901.2
116
165.4165.3165.1
165.2
165.1
164.2
739.4
739.2
739.2
705
705
165.3
165.4
914
228.2
Catalog DKC/DMC Edition 10/2010 39
General drawings
Gen
eral
dra
win
gs
Fig. 2 Station block for pump sizes K 55–118 with pressure maintaining valve closure
300
472
739.3
304
606.3
893
076
739.1
502
405
914.1
228.2164.1
739.4739.5739.5
164.2
739.4
739.2
739.2
705
705
914
165.3165.3165.3
165.4
165.3165.3606.1
611.1
611.2
611.4611.3
165.2
423
606.2
228.1
914.1
116
40 DKC/DMC Edition 10/2010 Catalog
General drawings
Gen
eral
dra
win
gs
Fig. 3 Internal pressure maintaining valve Fig. 4 External pressure maintaining valve
Small pump station
Large pump station
Fig. 5 Electric heating system Fig. 6 Screw connection fluid heating system
424
914.2
629
629
739.6
424
482
493
481
483
483
Catalog DKC/DMC Edition 10/2010 41
General drawings
Gen
eral
dra
win
gs
Fig. 7 Two-way valve / Limit switch two-way valve / Actuators
Fig. 8 Leak oil monitoring / Thermometer / Strainer cover protection /
Differential pressure monitoring / Base frame with oil pan
310
307
308
300
309.1309.1
425.1
425.2
425.3425.4
425.5
739.2 705
914914
705 739.2
425.6
309.2
075
605
717
621225
42 DKC/DMC Edition 10/2010 Catalog
General drawings
Gen
eral
dra
win
gs
Fig. 9 Pressure switch
Fig. 10 Pump station with mounted pumps
607
729.2
729.1
225
901.2
894.2
180
529
001
Catalog DKC/DMC Edition 10/2010 43
Spare parts
Gen
eral
dra
win
gs
Spare parts
Tab. 1 Spare part numbers
Spare part No.
Part Spare part No.
Part
001 Pump 482 Electric heating system
075 Strainer cover protection 483 Screw connection
076 Strainer cover 493 Screw plug
116 Station block 502 Conical spring
164.1 Locking bolt 529 Motor
164.2 Screw plug 605 Differential pressure indication
165.1 Screw plug 606.1 Suction-side pressure gauge
165.2 Screw plug 606.2 Suction-side pressure gauge
165.3 Screw plug 606.3 Pressure-side pressure gauge
165.4 Screw plug 607 Pressure switch
180 Pump bracket 611 Non-return valve
225 Base frame with oil pan 611.1 Supporting ring
228.1 Hoisting eye 611.2 O-ring
228.2 Hoisting eye 611.3 Sealing washer
300 Two-way/reversing valve lever 611.4 Spring
304 Control plug 621 Leak oil monitoring
307 Actuator, electrical 629 Valve housing
308 Actuator, pneumatic 705 Counter flange
309 Two-way valve limit switch 717 Thermometer
309.1 Proximity switch 729.1 Flat gasket
309.2 Bracket 729.2 Flat gasket
310 Mounting bracket actuator 739.1 O-ring
405 Strainer insert 739.2 O-ring
423 Vent valve 739.3 O-ring
424 Pressure maintaining valve 739.4 O-ring
425 Two-way valve 739.5 O-ring
425.1 Circlip 739.6 O-ring
425.2 O-ring 893 Cap nut
425.3 Control plug 894.2 Hexagon nut
425.4 O-ring 901.1 Stud screw
425.5 Valve housing 901.2 Stud screw
425.6 Socket screw 914 Socket screw
472 Circlip 914.1 Socket screw
481 Heating element 914.2 Socket screw
44 DKC/DMC Edition 10/2010 Catalog
Catalog DKC/DMC Edition 10/2010 45
KRAL AG, Bildgasse 40, Industrie Nord, 6890 Lustenau, Austria,Tel.: +43 / 55 77 / 8 66 44 - 0Fax: +43 / 55 77 / 8 84 33, www.kral.at, E-Mail: [email protected]