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Desmi NSL 200-330 - 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

  • V
    Vincent ClarkeAug 9, 2025
    Why does my Desmi NSL 200-330 Water Pump have low capacity?
    • S
      Stephanie Hickman DVMAug 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
    Suzanne DuffyAug 20, 2025
    Why is my Desmi Water Pump using too much power?
    • E
      Eric MezaAug 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.
  • N
    nicholas45Aug 30, 2025
    What to do if Desmi Water Pump suction line leaks?
    • B
      Brian SanchezAug 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

Intended Use

Defines the proper usage and operation of the pump set.

Safety Information for the Operator;User

Specific safety instructions for pump operators and users.

Safety Information for Maintenance, Inspection and Installation

Safety guidelines for all maintenance, inspection, and installation tasks.

Technical Specification

Work Range

Defines the operational limits for pressure, temperature, density, and viscosity.

Technical Data

Provides detailed technical specifications, including vibration and noise.

Installation

Mounting; Fastening

Instructions for correctly mounting and securing the pump.

Wiring

Guidelines for electrical wiring, requiring special skills.

Commissioning, Start-Up and Shutdown

Prerequisites for Commissioning; Start-Up

Conditions to be met before starting the pump.

Priming and Venting the Pump

Procedures for filling and removing air from the pump.

Start Up

Steps and precautions for safely starting the pump.

Shut Down

Procedures for safely stopping the pump.

Operating Limits

Guidelines for operating the pump within safe parameters.

Troubleshooting

Mechanical Seal Failure Analysis

Guide to identifying and resolving mechanical seal failures.

Inspection and Service Plan

Supervision of Operation

Monitoring and checks required during pump operation.

Dismantling the Pump Set

02 and 12 Combinations

13 and 14 Combinations

Assembling the Pump Set

12 Combination

02, 13 and 14 Combinations

Ordering Spare Parts

NSL;-02 Combination

NSL;-12 Combination

NSL;-13;14 Combinations

Desmi NSL 200-330 Specifications

General IconGeneral
Casing MaterialCast iron
Impeller MaterialBronze
Inlet Diameter200 mm
Flange StandardDIN or ANSI
Liquid TemperatureUp to 120°C
Speed1450/2900 rpm
MaterialCast Iron, Bronze
ApplicationIndustrial, Marine

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