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Desmi NSL 80-265 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:

Desmi NSL 80-265 Specifications

General IconGeneral
BrandDesmi
ModelNSL 80-265
CategoryWater Pump
LanguageEnglish

Summary

1. GENERAL DESCRIPTION

1.4. ATEX declaration of conformity

Details ATEX declaration, product description, and precautions for explosive atmospheres.

2. SAFETY

2.1. Key to safety symbols/markings

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

2.2. Intended use

Details the proper operational scope and prevention of foreseeable misuse for the pump set.

2.5. Safety information for the operator/user

Provides critical safety guidelines for operators, including protective equipment and hazard containment.

2.6. Safety information for maintenance, inspection and installation

Outlines safety precautions for carrying out maintenance, inspection, and installation procedures.

2.8. Explosion protection

Information for operating in potentially explosive atmospheres, referencing ATEX directives and specific sections.

2.8.2. Temperature limits

Specifies maximum allowed fluid and operating temperatures, with conditions for higher temperatures.

3. TRANSPORTATION, PREVENTATION AND TEMPORARY STORAGE

3.2. Transport

Safety precautions and guidelines for transporting pumps, including lifting hazards.

4. TECHNICAL SPECIFICATION

4.1. Work range

Details media and ambient temperature ranges, density, and viscosity limits for pump operation.

4.2. Technical data

Presents various technical data points including vibration, capacity, and motor frame size.

5. INSTALLATION

5.1. Mounting / Fastening

Guidelines for mounting and fastening the pump on a solid foundation, considering temperature hazards.

5.2. Wiring

Instructions for wiring, emphasizing special skills required and safety warnings.

Pump installation foundation

Requirements for pump installation foundations, pipe connections, and supports for stability and vibration reduction.

Vibration prevention on vertical Pumps installed on ships

Addresses vibration issues on ships, suggesting structural reinforcements and lateral supports.

DESMI recommends the following values for protective settings

Table of recommended vibration alarm and trip levels for pumps and motors.

Maximum suction up height (suction lift)

Formula and explanation for calculating maximum suction up height to prevent cavitation.

6. COMMISSIONING, START-UP AND SHUTDOWN

6.1. Prerequisites for commissioning / start-up

Checks and conditions required before commissioning and starting up the pump set.

6.2. Priming and venting the pump

Detailed instructions on priming and venting the pump, including explosion hazard warnings.

6.3. Start up

Provides crucial warnings and steps for starting up the pump, covering explosion and damage hazards.

6.3.1. Start-up procedure

Step-by-step guide for the start-up procedure, including pre-checks and rotation direction verification.

6.5. Shut down

Procedures for safely shutting down the pump, including heat considerations for the shaft seal.

6.6. Operating limits

Emphasizes compliance with working range and technical data, detailing hazards of exceeding limits.

6.10. Return to service

Steps for returning a pump to service, including performing maintenance and re-activating safety devices.

7. TROUBLESHOOTING

The pump has no or too low capacity

Lists causes (e.g., wrong rotation, choked system) and remedies for low pump capacity.

The pump uses too much power

Identifies causes (e.g., counter-pressure, foreign body) and remedies for excessive pump power consumption.

The pump makes noise

Lists causes of pump noise, such as cavitation, and their respective remedies.

7.1. Mechanical seal failure analysis

Analyzes mechanical seal failures, their impacts, indications, and how to avoid them.

Bad piping and fitting arrangement

Discusses issues from poor piping, their impacts, indications, and how to avoid them.

Starvation / lack of inlet flow

Addresses issues related to insufficient inlet flow, its causes, indications, and prevention.

External excited vibrations from the vessel or piping system

Covers external vibrations, their impact, and methods for reducing them.

Dry running of the pump – closed inlet/discharge valve

Details risks of dry running, its causes, indications, and preventative measures.

Operating outside recommended QH area (70-120% of BEP)

Explains consequences of operating outside the recommended flow range and monitoring methods.

Medium and/or pressure and/or liquid temperature not according to specification

Water hammer / hydraulic shocks

8. INSPECTION AND SERVICE PLAN

8.1. Supervision of operation

Guidelines for monitoring pump operation, covering explosion, leakage, and bearing hazards.

Inspection and maintenance intervals

Table outlining daily, weekly, monthly, and long-term inspection and maintenance tasks for pumps.

9. DISMANTLING THE PUMP SET

Preparing the pump set

Dismounting the complete pump set

Remove the motor

Remove the back pull-out unit

9.1. 02 and 12 combinations

9.1.1. Access to impeller

9.1.2. Dismantling shaft seal

Procedures for dismantling shaft seals for ø215/265-02 and ø215/265-12 combinations.

9.1.4. Dismantling bearing (only 02 combination)

9.1.5. Inspection

9.1.6. Dismantling coupling (02 combination) / shaft (12 combination)

9.2. 13 and 14 combinations

9.2.1. Access to impeller

9.2.2. Dismantling shaft seal

Procedures for dismantling shaft seals for ø215/265 and ø330/415/418/465/525 combinations.

9.2.4. Dismantling shaft with bearings

9.2.5. Inspection

10. ASSEMBLING THE PUMP SET

10.1. 12 combination

10.1.1. Fitting sealing rings

10.1.2. Fitting shaft seal

Procedures for cleaning, lubricating, and installing shaft seals for pumps with balanced shaft seal type ELK.

10.1.3. Fitting impeller

10.1.4. Fitting rear cover or motor bracket

10.1.5. Shaft

10.2. 02, 13 and 14 combinations

10.2.1. Fitting sealing rings

10.2.2. Fitting bearings or shaft with bearings

10.2.3. Fitting water deflector

10.2.4. Fitting shaft seal

Instructions for cleaning, lubricating, and installing shaft seals for pumps with balanced shaft seal type ELK.

10.2.5. Fitting impeller

10.2.6. Fitting bearing housing and rear cover

10.2.8. Fitting coupling

11. ORDERING SPARE PARTS

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