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Desmi NSL 125-215 - User Manual

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DESMI Vertical In-Line Centrifugal Pump
OPERATION AND MAINTENANCE INSTRUCTIONS
NSL MONOBLOC & SPACER
DESMI Pumping Technology A/S
Tagholm l, DK-9400 Nørresundby, Denmark
Tel.: +45 96 32 81 11
Fax: +45 98 17 54 99
E-mail: desmi@desmi.com
Internet: www.desmi.com
Manual:
T1542
Language:
English
Revision:
A.1
Special pump Number. ...............................................
Original instructions

Table of Contents

Questions and Answers

  • B
    Brenda ShepardAug 9, 2025
    Why does my Desmi NSL 125-215 Water Pump have low capacity?
    • L
      Linda FigueroaAug 10, 2025
      If your Desmi Water Pump has no or low capacity, several issues could be the cause. First, the direction of rotation might be wrong; change it to clockwise when viewed from the shaft end, following the arrow's direction. Another reason may be that the piping system or the pump itself is choked; in that case, clean or replace the piping system, or clean the pump. Suction line leaks could also be the problem; find and repair any leaks, ensuring the non-return valve is submerged. Finally, check if the suction lift is too high by referring to the data sheet Q/H curve and NPSH, or the pump and piping system may be wrongly dimensioned.
  • S
    Steve HansonAug 20, 2025
    Why is my Desmi Water Pump using too much power?
    • B
      bmartinezAug 20, 2025
      If your Desmi Water Pump uses too much power, several factors could be responsible. Check if the counter-pressure is too low, and consider inserting an orifice plate or check valve. A foreign body in the pump can also cause this issue, so dismantle the pump and remove any obstructions. Also, ensure that the electric motor is running on all phases by checking fuses, cable connections, and cables. If the liquid is heavier than water, contact DESMI.
  • J
    Joshua JohnsonAug 29, 2025
    What to do if Desmi Water Pump suction line leaks?
    • M
      Marissa BeckAug 29, 2025
      If your Desmi Water Pump has no or too low capacity, it could be due to suction line leaks. Find the leakage and repair the fault, ensuring the non-return valve is submerged. Also check if the pump takes in air.

Summary

2. SAFETY

2.2. Intended use

Defines proper pump operation and prevention of foreseeable misuse.

4. TECHNICAL SPECIFICATION

4.2. Technical data

Details key technical specifications such as vibration, capacity, and motor size.

5. INSTALLATION

5.1. Mounting; Fastening

Guidelines for securely mounting and fastening the pump to a foundation.

5.2. Wiring

Instructions and warnings for electrical wiring of the pump set.

6. COMMISSIONING, START-UP AND SHUTDOWN

6.2. Priming and venting the pump

Procedure for priming and venting the pump, including explosion hazard warning.

6.3. Start up

Safety warnings and procedures for starting up the pump set.

6.6. Operating limits

7. TROUBLESHOOTING

7.1. Mechanical seal failure analysis

Analysis of mechanical seal failures, their impacts, indications, and avoidance.

Dry running of the pump - closed inlet;discharge valve

Troubleshooting dry running and consequences of closed valves.

8. INSPECTION AND SERVICE PLAN

8.1. Supervision of operation

8.2. Inspection work

Details inspection and maintenance intervals for various pump components.

Inspection and maintenance intervals for normal applications

Defines daily, weekly, monthly, and periodic inspection/maintenance tasks.

Desmi NSL 125-215 Specifications

General IconGeneral
Pump Housing MaterialCast Iron
Inlet Diameter125 mm
Nominal Diameter125 mm
Flange StandardDIN
MaterialCast iron
Pump TypeSelf-priming centrifugal pump

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