Desmi NSL 250-330 User Manual

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

Desmi NSL 250-330 Specifications

General

Brand	Desmi
Model	NSL 250-330
Category	Water Pump
Language	English

Summary

General Description of DESMI Pumps

EU & UK Declaration of Conformity

Declaration that NSL Monobloc & Spacer pumps conform to essential safety requirements and harmonized standards.

ATEX Declaration of Conformity

Information on ATEX rules for pumps used in potentially explosive atmospheres and required precautions.

Safety Precautions and Guidelines

Understanding Safety Symbols and Markings

Explanation of signal words (DANGER, WARNING, CAUTION) and hazard symbols used in the manual.

Intended Use and Foreseeable Misuse

Guidelines for correct pump operation and prevention of foreseeable misuse to ensure safety.

Explosion Protection Details

Information on explosion protection, marking, temperature limits, monitoring, and operating limits.

Pump Installation Procedures

Vibration Prevention and Control

Maximum Suction Up Height Calculation

Method for calculating maximum suction up height to avoid cavitation and ensure proper pump operation.

Commissioning, Start-Up, and Shutdown

Prerequisites for Commissioning and Start-Up

Conditions that must be met before commissioning and starting up the pump set.

Pump Priming and Venting Procedures

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

Start-Up Procedures

Detailed steps for starting up the pump, including safety checks and operating range adherence.

Operating Limits and Frequency of Starts

Guidelines on operating limits, ambient temperatures, and permissible frequency of pump starts.

Troubleshooting Common Pump Issues

Fault Finding: Low Capacity and High Power Consumption

Troubleshooting table for issues like low capacity, high power use, and pump noise.

Mechanical Seal Failure Analysis

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

Troubleshooting Piping and Flow Issues

Guidance for resolving problems related to piping arrangements, starvation, and high liquid velocities.

Troubleshooting: Dry Running and Operating Outside Specification

Addressing issues like dry running, operating outside QH area, and incorrect medium/temperature.

Inspection and Service Plan

Supervision of Operation and Safety Checks

Key safety checks during operation, including explosion hazards, fluid leaks, and bearing temperatures.

Inspection and Maintenance Intervals