Heating. Heating. Electrical or medium heating for the preheating of highly viscous fluids.

Expansion valve. Expansion valve. To prevent an unacceptably high internal pressure within unused parts of the block due to heating and thermal expansion, the switch valve cylinder has two small expansion valves.

Different fluids. Different fluids. A two-way valve can be switched manually, electrically or pneumatically, allowing for switching between two types of fuel.

Pump variations. Pump variations. Double stations can be set up with KRAL pumps for pressures up to 40 bar.

KRAL Pump Stations DKC / DLC / DS/L.

Two pumps provide more than double the advantages.

Cost-effective solution for double the flow rate and for maximum operational reliability.
There are critical applications in which a second screw pump is prescribed for security. With KRAL pump stations you have a cost-effective and space-saving solution with which you can prevent motor standstill, production interruptions and heating failures. Maintenance work can also be carried out during operation without pump standstill.

A further advantage of KRAL double stations is the possibility of parallel operation of the two 3-screw pumps. This means that the flow rate can be doubled, but the space requirement and effort are considerably less than with the installation of two single positive displacement pumps.

Typical applications are booster modules of oceangoing ships, and burner stations in marine and industrial applications. Maximum reliability is required. The most common operating mode is therefore that one screw pump is running and the other is switched off (standby).

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Operation, materials, components.

Delivery rate: 5 to 280 l/min.
Max. differential pressure: 40 bar.
Temperature range: -20 °C to 180 °C.
Housing: Nodular cast iron EN-GJS-400.
Triple screws: Steel, nitrided.
Approvals: ABS, BV, CCS, DNV, GL, LRS, MRS, NK, RINA.
ATEX: II 2 GD b/c group II, category 2.
Heating: Electrical, media or steam.
Seal type: Mechanical seal standard or hard material.
Available with magnetic coupling.

In the case of a ship, the failure of the fuel screw pump in the booster module means that the engine comes to a standstill. If the flame goes out in a burner, a production process will be interrupted or a heating system will fail. Such applications require security. For maintenance, the primary screw pump can be switched to the standby screw pump, without interruption.

Cost reduction through many functions in compact space.

If a second screw pump is necessary, it soon becomes clear that the cost of design, pipework and control is considerable. The space requirement for a structure involving individual components is also very large. A significantly more economical solution is represented by the completely newly developed DKC and DLC dual stations by KRAL. Two screw pumps of the K series up to 16 bar or L series up to 63 bar are fitted to one block. The block integrates all functions within minimum space, and is available with many further options. And the flow rate can be doubled.

Alternate operation between two liquids.

For alternate operation between light and heavy oil operation, for example, the operator does not have to carry out any complex pipework when using KRAL pump stations. As an option, a liquid changeover switch can be fitted. In this way, KRAL dual stations are connected to two pipeline systems with different liquids. Switching between the liquids is manual, electrical or pneumatic. For remote monitoring of the lever position, limit switches are available.

Service without stopping the screw pump.

Reliability through a standby screw pump which is always available is the basic idea of the dual station. In this way, maximum reliability is ensured. After the changeover, the switched-off port of the station block is depressurized and the screw pump can easily be removed. The ship’s engine continues to run, the production process is not interrupted, the heating system continues to operate.

Extremely easy installation.

KRAL dual stations with two 3-screw pumps are quickly set up and fixed. In the simplest case, the suction and pressure lines have to be connected. Done! The connections for the suction and pressure sides are at the front, so they are easy to reach. In contrast to the traditional structure involving two individual screw pumps, apart from connecting the suction and pressure lines no development, design or pipework is required. That saves a lot of time and money.

Various applications.

KRAL double stations with two 3-screw pumps are an economical and reliable solution for all industries in which a continuous supply of oil is required: in oil firing technology for delivering heating oil, circular pipeline transfer screw pumps and burner screw pumps for industrial furnaces, in public buildings and in the ship building industry.

Many useful options are available.

Heating variants for heating highly viscous fluids.
Two-way valve for switching between liquids.
Pressure-retaining valve for constant feed pressure.
Pressure switch for monitoring pressure.
Differential pressure display for monitoring the loading of the strainer.
Temperature measurement of the fluid.
Monitoring leaked oil.
Strainer cover protection to prevent accidents caused by oil being sprayed out.

Accessory: KRAL precision flowmeters.

Maintenance work without downtime.

KRAL block aggregates stand out for their ready-for-connection, compact construction. Both of the installed KRAL screw pumps are self-priming pumps with low pulsation and operate at a low noise level. Switching over from the operating screw pump to the reserve screw pump can be carried out electrically or manually. Screw pump maintenance and filter cleaning can be performed without interrupting operations.

Your advantages.

Reliable solution for many applications.
High operational reliability.
Liquid switching without complex piping.
Doubling of the flow rate.
Lower costs for design, piping and control.
Simple installation.
Service without pump standstill in the system.
For different pressure ranges, as required.

Technical data		5-42	55-118
Qth (1450 min-¹, 0 bar)	l/min	5-43	59-119

Max. pressure at pressure flange	bar
K		16	16
KFT		16

Temperature	°C
with NBR rotary lip seal		80	80
with FKM rotary lip seal		150	150
with mechanical seal standard		150	150
with mechanical seal hard material		180	180
with magnetic coupling standard		180	180
with magnetic coupling high temperature		250	250

Viscosity	mm²/s
min.		2	2
max.		10,000	10,000

Max. pressure at suction flange	bar
with rotary lip seal		6	6
with mechanical seal standard		6	6
with mechanical seal hard material		6	6
with magnetic coupling		16	16

Technical data		5-10	15-26	32-54	55-85
Qth (1450 min-¹, 0 bar)	l/min	5-10	15-26	32-58	58-84

Max. pressure at pressure flange	bar	40	40	40	40

Temperature max. pumped liquid	°C
with radial shaft seal NBR		80	80	80	80
with radial shaft seal FKM		150	150	150	150
with mechanical seal standard		150	150	150	150
with mechanical seal hard material		180	180	180	180
with magnetic coupling *

Viscosity	mm²/s
min.		1.5	1.5	1.5	1.5
max.		7,000	7,000	7,000	7,000

Max. pressure at suction flange	bar
with radial sealing ring		6	6	6	6
with mechanical seal standard		6	6	6	6
with mechanical seal hard material		6	6	6	6
with balanced mechanical seal
model LFI/LFT/LFW/LVI/LVT		20	20	20	20
model LFM		6	6	6	6
with magnetic coupling *

* customer-specific, contact KRAL

Technical data		5-10	15-26	32-54
Qth (1450 min-¹, 0 bar)	l/min	5-10	15-26	32-57

Max. pressure at pressure flange	bar	6	6	6

Temperature max. pumped liquid	°C
with radial shaft seal NBR		80	80	80
with radial shaft seal FKM		150	150	150
with mechanical seal standard		150	150	150
with mechanical seal hard material		180	180	180

Viscosity	mm²/s
min.		1.1	1.1	1.1
max.		7,000	7,000	7,000

Max. pressure at suction flange	bar
with radial sealing ring		0.5	0.5	0.5
with mechanical seal standard		6	6	6
with mechanical seal hard material		6	6	6

Double stations DKC and DLC.

double station screw pumps diesel vertical

The compact double stations DKC and DLC consists of two KRAL screw pumps K or L series, station block, hoisting eye, suction-side pressure gauge, strainer cover, pressure-side pressure gauge, reversing valve lever, vent valve, pressure connection and suction connection. More options on request.

Double stations DS1, DS3, DS4.

Search result product double station screw pump vertical

The double stations DS1, DS3, DS4 consists of two KRAL NE screw pumps , two strainers, two non-return valves, overflow valve, two lockable vacuum gauges, lockable pressure gauge, oilpan and one lever control with counter flanges. More options on request.

Double station DL2.

Search result product DL2 screw pump diesel vertical

The low pressure double station DL2 consists of two KRAL FE screw pumps, two strainers, two non-return valves, overflow valve, lockable pressure gauge, oilpan and lever control with counter flanges. More options on request.

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Operation, materials, components.

Cost reduction through many functions in compact space.

Alternate operation between two liquids.

Find out more

Service without stopping the screw pump.

Extremely easy installation.

Various applications.

Many useful options are available.

Maintenance work without downtime.

Your advantages.

DKC series.

DLC series.

DS/L series.

You have several options for finding the right operating instructions/product information sheet:

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Full text search

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Results

OIK 14 | Screw pump | K | Mechanical Seal

OIK 07 | Screw pump | K | Radial shaft seal

OIK 09 | Screw pump | K | Magnetic coupling

OIK 10 | Pump station | EKL/EKS | –

OIL 01 | Screw pump | L | Mechanical seal / Radial Shaft Seal

OIL 02 | Screw pump | L | Magnetic coupling

OIL 03 | Pump station | ELL/ELS | Mechanical seal / Radial Shaft Seal

OIC 01 | Screw pump | CK | Mechanical seal / Radial Shaft Seal

OIC 02 | Screw pump | CL | Mechanical seal / Radial Shaft Seal

OIC 10 | Screw pump | CG | Magnetic coupling

OIC 13 | Screw pump | CL | Magnetic coupling

OIC 18 | Screw pump | CG | Mechanical seal / Radial Shaft Seal

OIM 01 | Screw pump | M | Mechanical seal / Radial Shaft Seal

OIM 05 | Screw pump | M | Magnetic coupling

OIN 04 | Screw pump | NS | Radial shaft seal

OIW 01 | Screw pump | W | Mechanical seal / Radial Shaft Seal

OID 02 | Pump station | DKC/DLC | Mechanical seal / Radial Shaft Seal

OID 03 | Pump station | DKC/DLC | Magnetic coupling

OID 05 | Pump station | DL2 | Mechanical seal / Radial Shaft Seal

OID 06 | Pump station | DL3/DL4/DS1/DS3/DS4 | Mechanical seal / Radial Shaft Seal

OID 07 | Pump station | DL3/DL4/DS1/DS3/DS4 | Magnetic coupling

OIO 08 | Flowmeter | OMH | –

OIO 14 | Flowmeter | OMG | –

OIO 15 | Flowmeter | OME | –

OIO 20 | Flowmeter | OME compact | –

OIO 23 | Flowmeter | OMP | –

OIO 28 | Flowmeter | OMX | –

OIO 30 | Flowmeter | OMS | Low-viscosity liquids

OIO 31 | Flowmeter | OMS | High-viscosity liquids

OIO 03 | Flowmeter | OMK | –

OIE 26 | Elektronics | BEM 100 | –

OIE 29 | Elektronics | BEM 100 | Support-Software Smart Support

OIE 29 | Elektronics | BEM 150 | Support-Software Smart Support

OIE 27 | Elektronics | BEM 150 | –

OIE 24 | Elektronics | BEM 200 | –

OIE 15 | Elektronics | BEM 300 | –

OIE 23 | Elektronics | BEM 300 | Modbus communication

OIE 22 | Elektronics | BEM 500 | Modbus communication

OIV 01 | Elektronics | BEM 500 | Differential measurement

OIE 12 | Elektronics | BEM 500 | –

OIE 30 | Elektronics | Smart Solution Display | –

OII 08 | Sensors | EET | Temperatur sensors

OII 02 | Sensors | BEG | Pick up

OIG 01 | Screw pump | G | Mechanical Seal

OPR 01 | Screw pump | K | Product information sheet

OPR 02 | Screw pump | K | Product information sheet

OPR 03 | Screw pump | K | Product information sheet

OPR 04 | Screw pump | K | Product information sheet

OPR 07 | Screw pump | L | Product information sheet

OPR 05 | Screw pump | K | Product information sheet

OPR 06 | Screw pump | K | Product information sheet

OPR 08 | Screw pump | L | Product information sheet

OPR 09 | Screw pump | CK | Product information sheet

OPR 10 | Screw pump | L | Product information sheet

OPR 11 | Pump station | DKC/DLC | Product information sheet

OPW 01 | Screw pump | K | Product information sheet

OPW 02 | Screw pump | K | Product information sheet

OPW 03 | Screw pump | K | Product information sheet

OPW 04 | Screw pump | K | Product information sheet

OPW 09 | Screw pump | K | Product information sheet

OPW 10 | Screw pump | K | Product information sheet

OPW 11 | Screw pump | K | Product information sheet