Circor ALLWEILER NI Series User Manual (English)

Barry RamseyAug 1, 2025

How to fix a Circor Water Pump that is not pumping?

D
Dr. David PerryAug 1, 2025
If your Circor Water Pump isn't pumping, it could be due to several reasons. The supply or suction pipe might be blocked; try cleaning it. An un-bled or incompletely filled supply pipe can also be the cause; ensure the pump and piping are completely filled and bled. Also, check if the supply or suction pipe is closed by armature, and open it. If the stub shaft is loose, tighten it firmly. Remove the transport and sealing cover. If the supply/suction pipe cross-section is too narrow, increase it and completely open the armature. If there are air pockets, install the armature for bleeding and correct the piping layout. Seal any sources of air being sucked in. For excessive gas or high pumped medium temperature, consult the manufacturer.

Series	NI Series
Materials	Cast iron, stainless steel
Seal Type	Mechanical seal
Connection Type	Flanged
Standards	DIN
Temperature Range	-20°C to +120°C

Series

NI Series

Materials

Cast iron, stainless steel

Seal Type

Mechanical seal

Connection Type

Flanged

Standards

DIN

Temperature Range

-20°C to +120°C

Summary

About this Document

Target Groups and Duties

Defines target groups and their respective duties for operating and maintaining the pump.

Warnings and Symbols

Warnings and Consequences

Explains warning symbols, their risk levels, and consequences of disregard.

Technical Terms Definition

Defines key technical terms used in the manual for clarity.

Safety Guidelines

Intended Use of the Pump

Specifies the authorized purposes and restrictions for pump operation.

General Safety Instructions

Provides fundamental safety guidelines for operating the pump and personnel.

Product Safety

Details product safety aspects and user responsibilities for safe operation.

Operating Company Obligations

Outlines the responsibilities of the operating company for safe pump operation.

Specific Hazards

Identifies and explains specific risks associated with pump operation.

Explosion Hazard Area Precautions

Addresses specific safety requirements for operation in explosion hazard areas.

Electric Shock Hazards

Warns about the risk of electric shock and necessary precautions.

Hazardous Liquids Handling

Details hazards related to pumped liquids and necessary handling precautions.

Moving Parts Safety

Highlights dangers associated with moving components and safety measures.

Hot Surfaces Protection

Warns about burn risks from hot pump surfaces and necessary precautions.

Personnel Obligations

Specifies personnel duties and safety requirements during operation and maintenance.

Layout and Function

Pump Labels and Identification

Describes the various labels and identification plates on the pump.

Type Plate Details

Details the information provided on the pump's type plate.

Digital Nameplate Information

Explains the function and content of the digital nameplate.

Pump Type Code Explanation

Explains the structure and meaning of the pump type code.

Pump Layout Diagram

Provides a schematic diagram of the pump's main components and their arrangement.

Shaft Seals Types

Discusses the types of shaft seals used in the pump and their function.

Mechanical Seals Details

Details the characteristics and types of mechanical seals used.

Auxiliary Systems Overview

Describes auxiliary systems connected to the pump.

Sealing Systems Description

Explains the sealing systems, including quenching mechanisms.

Transport, Storage, and Disposal

Pump Transport Instructions

Provides instructions for safely transporting the pump unit.

Unpacking and Delivery Inspection

Guides on how to unpack and inspect the pump upon delivery.

Safe Lifting Procedures

Details safe lifting procedures and precautions for the pump aggregate.

Pump Preservation for Storage

Outlines procedures for preserving the pump for storage.

Proper Pump Storage

Specifies conditions and procedures for proper pump storage.

Removing Preservative

Explains how to remove preservative before pump installation.

Pump Disposal Guidelines

Provides guidelines for the safe and environmentally sound disposal of the pump.

Setup and Connection

Setup Preparation Steps

Covers initial preparations before installing the pump.

Ambient Conditions Check

Ensures the operating environment meets required conditions.

Installation Site Preparation

Details requirements for the pump's installation location.

Preservative Removal for Operation

Instructs on removing preservative before immediate operation.

Optional Heat Insulation Installation

Explains the optional installation of heat insulation.

Guard Sheet Alignment Verification

Provides safety checks for guard sheet alignment.

Pipe Planning

Guides on planning pipe connections for the pump.

Pipe Supports and Flange Connections

Details requirements for pipe supports and flange connections.

Nominal Diameter Specification

Provides guidance on selecting nominal pipe diameters.

Pipe Length Specification

Recommends specific pipe lengths upstream and downstream of the pump.

Pipe Cross-Section and Direction Changes

Offers advice on pipe cross-section and direction changes for optimal flow.

Discharging Pump Leaks Safely

Details safety measures for handling and discharging pump leaks.

Safety and Control Devices

Recommends installation of safety and control devices for pump operation.

Installing Pump in Pipe

Provides instructions for installing the pump within the piping system.

Keeping Piping Clean

Emphasizes the importance of clean piping for pump protection.

Installing Pump Unit without Base

Provides instructions for installing the pump unit without a base.

Setting Up Pump Unit with Base

Details the procedure for setting up pump units with feet/base.

Installing Auxiliary Pipes

Guides on connecting auxiliary pipes to the pump.

Motor Installation Procedure

Explains the process of installing the motor onto the pump unit.

Electrical Connection Safety

Provides instructions for safely connecting the motor electrically.

Connecting the Motor

Details the steps for connecting the motor according to diagrams.

Checking Motor Rotation Direction

Explains how to verify the motor's direction of rotation.

Installing Guard Sheet

Instructs on installing protective guard sheets on flanged drives.

Pump Operation

Initial Start-up Preparations

Details all necessary preparations before the first pump start-up.

Pump Type Identification

Guides on identifying the specific pump type and its variations.

Preservative Removal for Startup

Reiterates removing preservative for pumps treated for storage.

Auxiliary Systems Readiness

Ensures auxiliary systems are ready and compatible for operation.

Pump Filling and Bleeding

Instructs on filling the pump and bleeding air before operation.

Rotation Direction Check

Explains the procedure to verify the correct motor rotation direction.

Pump Start-Up Procedure

Provides step-by-step instructions for starting the pump.

Switching On the Pump

Details the procedure for safely switching on and starting the pump.

Switching Off the Pump

Outlines the correct procedure for switching off the pump.

Pump Shut-Down Procedures

Describes measures to take when shutting down the pump for various periods.

Restarting After Shutdown

Guides on restarting the pump after periods of inactivity.

Operating Stand-by Pumps

Explains how to operate and maintain stand-by pumps.

Pump Maintenance

Routine Inspections

Defines inspection intervals and checks for normal operation.

General Maintenance Tasks

Covers general maintenance tasks for the pump and motor.

Mechanical Seal Maintenance

Provides information on maintenance related to mechanical seals.

Pump Cleaning Procedures

Details procedures for cleaning the pump effectively.

Dismounting Safety and Instructions

Provides safety warnings and general instructions for dismounting the pump.

Returning Pump to Manufacturer

Outlines procedures and requirements for returning pumps for repair.

Dismounting Preparations

Lists the necessary preparations before dismounting the pump.

Flanged Motor Removal

Details the steps for safely removing the flanged motor.

Pump Installation Guide

Provides general instructions and safety warnings for re-installing pump components.

Pump Installation Steps

Details the concentric installation of pump components.

Flanged Motor Installation

Guides on installing the flanged motor onto the pump.

Ordering Spare Parts

Provides information and requirements for ordering spare parts.

Appendix and Technical Data

Sectional Drawings

Contains detailed sectional drawings of the pump and its components.

Auxiliary Connections Abbreviations

Lists and explains abbreviations for auxiliary connections.

Part Numbers and Designations

Provides a comprehensive list of part numbers and their designations.

Detailed Sectional Views

Presents detailed sectional views of pump assemblies.

Technical Specifications

Details various technical specifications of the pump.

Stub Shaft Diameter Specification

Specifies the diameter of the stub shaft at the shaft seal for different pump sizes.

Ambient Conditions Parameters

Lists the acceptable ambient temperature, humidity, and altitude ranges.

Sound Pressure Levels Data

Provides sound pressure level data for the pump at various motor speeds.

Tightening Torque Specifications

Lists recommended tightening torques for various fasteners.

Cleaning Agent Recommendations

Recommends suitable cleaning agents for different application areas.

Flange Load Limits

Defines permissible pipe forces and torques on the pump flanges.

Spare Parts for Two Years Operation

Recommends spare parts quantities for two years of continuous operation.

Declaration of Harmlessness Form

Form for declaring the pump's condition regarding hazardous substances.

EC Declaration of Conformity

States the pump's compliance with relevant EC Machine Directives.

Circor ALLWEILER NI Series User Manual

Table of Contents

Questions and Answers:

Circor ALLWEILER NI Series Specifications