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Desmi NSL 150-265 - 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

  • K
    Kelsey SmithAug 10, 2025
    Why does my Desmi Water Pump have low capacity?
    • J
      Jose Barnett PhDAug 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.
  • M
    Margaret TaylorAug 20, 2025
    Why is my Desmi NSL 150-265 using too much power?
    • K
      katierodriguezAug 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.
  • B
    Bill OliverAug 29, 2025
    What to do if Desmi Water Pump suction line leaks?
    • M
      Megan DavisAug 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

General Description

1.4. ATEX declaration of conformity

Declaration of conformity for ATEX-marked equipment and precautions.

Safety

2.1. Key to safety symbols;markings

Explanation of signal words, hazard symbols, and labels on the product.

2.2. Intended use

Specifies how the pump should be operated and prevents foreseeable misuse.

2.5. Safety information for the operator;user

Safety guidelines for pump operators regarding guards, PPE, and electrical hazards.

2.6. Safety information for maintenance, inspection and installation

Safety rules for carrying out maintenance, inspection, and installation work.

2.8. Explosion protection

Information on explosion protection for ATEX-marked pumps.

Technical Specification

4.1. Work range

Details on media and ambient temperature ranges, density, and viscosity.

4.2. Technical data

Covers vibration, hydraulic capacity, motor size, pressure, and noise.

Installation

5.1. Mounting; Fastening

Instructions for mounting and fastening the pump securely.

5.2. Wiring

Guidelines for electrical wiring, requiring special skills.

Commissioning, Start-Up and Shutdown

6.1. Prerequisites for commissioning; start-up

Conditions to meet before starting up the pump set.

6.2. Priming and venting the pump

Procedures for priming and venting the pump to prevent dry running and explosion.

6.3. Start up

Detailed steps and warnings for starting the pump.

6.5. Shut down

Procedure for safely shutting down the pump and motor.

6.6. Operating limits

Compliance with working range and technical data for safe operation.

Troubleshooting

7.1. Mechanical seal failure analysis

Analysis of common mechanical seal failures and how to avoid them.

Inspection and Service Plan

8.1. Supervision of operation

Safety checks and monitoring during pump operation.

8.2. Inspection work

Procedures for routine inspection and cleaning tasks.

Dismantling the Pump Set

9.1. 02 and 12 combinations

Procedures for dismantling 02 and 12 pump combinations.

9.1.1. Access to impeller

Steps to access the impeller for inspection or replacement.

9.1.2. Dismantling shaft seal

Steps for removing the shaft seal from the pump.

9.2. 13 and 14 combinations

Procedures for dismantling 13 and 14 pump combinations.

9.2.1. Access to impeller

9.2.2. Dismantling shaft seal

Assembling the Pump Set

10.1. 12 combination

10.1.2. Fitting shaft seal

10.1.3. Fitting impeller

10.2. 02, 13 and 14 combinations

10.2.2. Fitting bearings or shaft with bearings

10.2.4. Fitting shaft seal

10.2.5. Fitting impeller

10.2.8. Fitting coupling

Desmi NSL 150-265 Specifications

General IconGeneral
Casing MaterialCast Iron
Impeller MaterialBronze
Mechanical SealCarbon/Ceramic
Speed2900 rpm
Inlet Diameter150 mm
Outlet Diameter125 mm
Pump TypeCentrifugal
Suction ConnectionDN 150
Discharge ConnectionDN 125

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