KRAL DS1 Series User Manual

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Operating instructions

KRAL pump stations.

Series DL3 / DL4 / DS1 / DS3 / DS4

Mechanical seal/Radial shaft seal

OID 06en-GB

Edition 2019-11

Original instructions

www.kral.at

Table of Contents

Questions and Answers:

J
Joseph MendozaAug 9, 2025
What to do if there is a danger of poisoning and environmental damage through residues with KRAL DS1 Water Pump?
- J
  jenniferwoodAug 9, 2025
  If you encounter a danger of poisoning and environmental damage through residues, wear personal protective clothing, ensuring face protection during all work. Before disposal, collect any pumped liquid safely and dispose of it in an environmentally compatible manner according to local regulations. Neutralize the residues before disposing of them.
A
Angela AndrewsAug 15, 2025
Why is there no pump suction in my KRAL DS1 Water Pump?
- K
  krausechristineAug 15, 2025
  There could be several reasons for the lack of pump suction. It might be due to a closed pump suction line, so check and open any shut-off devices. Alternatively, parts like the filter, suction line, suction valve, or strainer could be soiled and need cleaning. A suction head that is too high, a level in the intake container that is too low (fill the intake container), too little pumped liquid in the pump (fill the pump), airlock/gas in the pumped liquid (test the pipe system for air admission, replace leaking parts; reduce the suction head or increase the inlet pressure), incorrect pump direction of rotation, or soiling of the filters/strainers could also be the cause.
L
Lisa JoyceAug 21, 2025
What to do if my KRAL Water Pump has no suction?
- J
  John MurilloAug 21, 2025
  If your KRAL Water Pump isn't drawing suction, start by checking if the pump suction line is closed and open it if necessary. Inspect and clean any soiled parts like the filter, suction line, suction valve, or strainer. Ensure the level in the intake container is adequate; if not, fill it. Also, verify that there's enough pumped liquid in the pump itself—add more if needed. Finally, check for airlocks or gas in the pumped liquid; test the pipe system for air leaks and replace any faulty parts. You might also need to reduce the suction head or increase the inlet pressure.
R
Roberto MendozaAug 27, 2025
How do I fix a KRAL Water Pump with no suction due to a high suction head?
- C
  Caitlin WalkerAug 27, 2025
  If your KRAL Water Pump isn't drawing suction and you suspect it's due to a high suction head, you can try the following: reduce the level difference, reduce the line length, increase the line cross-section, heat up the pumped liquid, or install a filter/strainer with a larger mesh width, ensuring that the permissible mesh width is not exceeded.
C
Crystal RamosSep 2, 2025
What to do if coupling aligned incorrectly in KRAL DS1?
- E
  Evan ChurchSep 2, 2025
  If the coupling is aligned incorrectly in your KRAL Water Pump, assemble the coupling and motor correctly, see the associated operating instructions of the pumps.

KRAL DS1 Series Specifications

General

Series	DS1
Seal Type	Mechanical seal
Motor Type	Electric motor
Control	Frequency inverter optional
Connection	Flanged

Summary

1 About this document

1.4.1 Danger levels

Explains different danger levels and their consequences.

1.4.2 Danger signs

Details specific danger signs and their potential hazards.

1.4.4 Symbols for personal protective equipment

Lists required personal protective equipment and associated risks.

2 Safety

2.1 Proper use

Defines the intended use of the pump station and operating limits.

2.2 Foreseeable misuse

2.3 Obligations of the operator-owner

2.4.1 Fundamental safety instructions

Lists critical safety instructions that must be strictly observed.

4 Technical data

4.1 Operating limits

Specifies the operational limits for pressure, temperature, and viscosity.

4.3 Inlet pressure for heavy fuel oil

5 Function description

5.1 Structure

5.2 Functional principle

5.4 Reversing valve

5.5 Overflow valve

5.6 Pressure measurement

6 Transportation, storage

6.1 Dangers during transportation

Lists safety instructions and hazards related to transporting the pump station.

6.2 Dangers during storage

Outlines safety instructions and hazards associated with storing the pump station.

6.4 Transporting the pump station

Details personnel qualifications, PPE, and aids for transporting the pump station.

7 Preservation

7.2 Preserving the inner surfaces

7.3 Preserving the outer surfaces

7.4 Removing the preservation

8 Installation, removal

8.1 Dangers during installation

Lists safety instructions and hazards specific to the installation process.

8.2 Dangers during removal

Lists safety instructions and hazards specific to the removal process.

8.3 Mounting the pump station

Provides instructions and considerations for mounting the pump station correctly.

8.4 Removing the pump station

Details the procedure and safety precautions for removing the pump station.

9 Connection

9.1 Dangers during connection work

Lists safety instructions and hazards related to connecting the pump station.

9.2 Connecting the pump station to the pipe system

9.3 Connecting the pump station to the power supply

Details the procedure and safety precautions for connecting to the power supply.

10 Operation

10.1 Dangers during operation

Lists critical safety instructions and hazards during pump station operation.

10.2.1 Cleaning the pipe system

10.2.2 Filling and venting the pump station

10.2.3 Checking the direction of rotation

10.2.4 Commissioning the pump station

Outlines the final steps and checks for commissioning the pump station.

10.3.1 Checking the operating pressure

10.3.2 Activating the reversing valve

10.3.3 Adjusting the overflow valve

10.3.4 Switching off the pump station

10.4.1 Taking the pump station out of operation

Details the procedure for safely taking the pump station out of operation.

11 Maintenance

10.5 Recommissioning

11.1 Dangers during maintenance

Lists critical safety instructions and hazards specific to maintenance activities.

11.2 Required maintenance

Specifies the required maintenance tasks and their cycles for the pump station and components.

11.5 Maintaining the pump station

11.6 Maintaining the strainers

12 Servicing

12.1 Dangers during servicing

Lists critical safety instructions and hazards specific to servicing activities.

12.2.1 Signs of wear

12.3 Cleaning the strainer

12.4 Replacing the coupling

12.5 Replacing the pump

Outlines the procedure and safety precautions for replacing the pump.

12.6 Replacing the mechanical seal

12.7 Replacing the radial shaft seal

12.8 Replacing the mechanical seal and ball bearing (outer bearing)

12.9 Replacing seals

13 Disposal

13.1 Dismantling and disposing of the pump station

14 Troubleshooting

14.1 Possible faults

Lists common faults, their potential causes, and troubleshooting measures.

14.2 Troubleshooting

Provides a detailed table of faults, causes, and remedies for troubleshooting.

17 Appendix

17.1 Tightening torques for screws with metric screw threads with and without wedge lock washers

Provides tightening torques for metric screw threads with different material properties.

17.2 Tightening torques for screw plugs with thread measured in inches and elastomer seal

Provides tightening torques for inch-threaded screw plugs with elastomer seals.

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