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Desmi NSL 300-418 - 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
    Brandy ClarkAug 9, 2025
    Why does my Desmi Water Pump have low capacity?
    • J
      Jason SkinnerAug 9, 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.
  • J
    James MatthewsAug 19, 2025
    Why is my Desmi NSL 300-418 Water Pump using too much power?
    • O
      oallenAug 19, 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.
  • N
    Noah DominguezAug 30, 2025
    What to do if Desmi NSL 300-418 suction line leaks?
    • A
      Anna MartinAug 30, 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

Safety

Safety Symbols and Markings

Explanation of safety symbols, signal words, and hazard markings used.

Intended Use

Defines the proper operational parameters and limitations for the pump.

Consequences of Non-Compliance

Details risks and warranty implications from not following the manual.

Operator and User Safety

Essential safety precautions for personnel operating the pump.

Maintenance and Installation Safety

Safety guidelines for performing maintenance, inspection, and installation.

Explosion Protection

Specific safety requirements for operation in potentially explosive atmospheres.

Technical Specifications

Work Range

Defines the operating limits for media temperature, ambient conditions, density, and viscosity.

Technical Data Summary

Installation

Mounting and Fastening

Electrical Wiring

Commissioning, Start-Up, and Shutdown

Commissioning and Start-Up Prerequisites

Conditions that must be met before initiating pump commissioning and start-up.

Priming and Venting the Pump

Steps for filling the pump with fluid and removing air before operation.

Start-Up Procedure

Detailed steps for safely starting the pump and bringing it to operating speed.

Shut Down Procedure

Operating Limits

Specifies the safe working ranges for pressure, temperature, and speed.

Troubleshooting

Mechanical Seal Failure Analysis

Diagnosing common issues and causes related to mechanical seal failures.

Inspection and Service Plan

Supervision of Operation

Inspection Tasks

Dismantling the Pump Set

02 and 12 Combinations

13 and 14 Combinations

Assembling the Pump Set

12 Combination Assembly

02, 13, and 14 Combinations Assembly

Ordering Spare Parts

Desmi NSL 300-418 Specifications

General IconGeneral
Pump TypeCentrifugal
MaterialCast Iron
ImpellerClosed
ShaftStainless Steel
SealMechanical Seal
Inlet/OutletFlanged
Flow Rate300 m³/h
Head40 m
Power55 kW
Speed2900 RPM

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