Go back

Product code: NM, NMD Series

Calpeda NM, NMD Series Centrifugal Pump with Threaded Ports

Pump Type - Centrifugal

Max Flow Rate M³H - 96 M³H

Max Head - 114M

Pump Materials - Brass, Bronze, Cast Iron

Max Temp - 90°C

Max Viscosity - 500 cst

Max Solid Passage - 0mm

Self Priming - Y

Inlet/Outlet Sizes - 25mm to 64mm

Drive - AC Electric

Max Suction Lift - 8M

DOWNLOADS

Volume Enquiry? Different Specification?

Request a Quotation

DESCRIPTION

Calpeda NM, NMD Series Centrifugal Pump with Threaded Ports

Flow Rate	Up to 96m³/hr
Head (Pressure)	Up to 114m
Inlet/Outlet Sizes	1” to 2 1/2”
Operating Temperature	-10°C to +90°C
Drive Options	Electric Motor

The Calpeda NM, NMD series of centrifugal pump is designed for the transfer of clean low viscosity fluids without abrasives, containing up to 0.2% solids content. This range of pumps can be constructed with either a cast iron casing (NM, NMD versions) or bronze casing (B-NM, B-NMD versions). Most cast iron models are supplied with a brass impeller, NM 17 is supplied with a cast iron impeller. Most bronze models are also supplied with a brass impeller, B-NM 17 is supplied with a bronze impeller.

The NM version is manufactured with a single impeller, the NMD version is manufactured with two back to back impellers.

Common applications include; water supply, heating, air-conditioning, cooling, circulation, civil, irrigation, fire fighting, sea water transfer and sea water cooling.

This Calpeda pump range is supplied with BSP connections as standard.

Motor options include 230V single phase 50Hz, 230V/400V three phase 50Hz and 400V/690V three phase 50Hz, other voltages and 60Hz motors are available on request.

Product Summary

• Centrifugal pump with threaded ports

• Compact design

• Suitable for clean low viscosity fluids without abrasives, containing up to 0.2% solids content

• Constructed with either cast iron casing or bronze casing. Impeller options include; brass, cast iron and bronze.

• BSP connections as standard

• Motor options include; 230V/1Ph/50Hz, 230V/400V/3Ph/50Hz and 400V/690V/3Ph/50Hz, other voltages and 60Hz available on request

• IP54 as standard, IP55 available on request

• Special mechanical seals available on request

• NM, B-NM series comply with European regulation 547/2012

FAQS

Can this pump run dry?

No, definitely not! Centrifugal pumps will incur damage even after short periods of dry running. The mechanical seal requires lubrication and cooling while the pump is operating. Without the presence of fluid, the mechanical seal will overheat and crack, and this may cause the pump to leak and fluid to enter the motor. There is also the possibility that the motor will burn out. Our advice is to ensure that the pump has a flooded suction or always make sure that the pump casing and inlet pipe are filled with water; one way of ensuring this is to fit a check valve on the inlet line to stop water escaping when the pump is inactive. Another way of protecting the pump is to fit a dry running device, this will turn the pump off if it detects that no fluid is entering the pump. If you think that dry running is inevitable, then please speak to a member of our sales team and we will select a more suitable pump for your application.

How do I know what pump materials are correct for my application?

Firstly, always check the compatibility of the materials available against the fluid being pumped. The main materials to check are the pump casing, impeller, o-ring and mechanical seal. It may be that more than one material is suitable for your fluid and selection could be based on the application type. For instance; cast iron, bronze and stainless steel are all suitable for fresh water. If it is a simple transfer application, then the most cost-effective material cast iron will be best. However, if it is a sanitary application, then stainless steel or bronze are better choices.

What is NPSH and why is it so important?

NPSH is an acronym for Net Positive Suction Head. NPSH measures the absolute pressure present in a fluid. There are two main ways that NPSH is expressed in a pump system NPSHa - This is the amount of Net Positive Suction Head available at the pump inlet. NPSHa demonstrates the amount of pressure acting on a fluid as it enters the pump. This measures the amount of pressure between the liquid staying in its current state and forming vapour bubbles (beginning to boil). NPSHr - This is the amount of Net Positive Suction Head that the pump requires to operate without experiencing the damaging effect of cavitation, thus causing a dramatic reduction in pump performance. It is very important to pay attention to these values when making a pump selection. Selecting a pump that requires more NPSH than is available in your system will cause fast and long-lasting damage to the pump and thus you will incur large repair costs and downtime.

What does the term best efficiency point (BEP) mean and why is it so important?

The best efficiency point or BEP is a point along the pump performance curve that indicates where efficiency for the pump peaks. When selecting a pump, you must try and get as close to the BEP as possible to ensure that the pump is at maximum efficiency when operating. The closer to the BEP the pump is when operating, the lower the energy costs will be, thus saving significant amounts of money during the pump’s lifetime. Also, vibrations will be at their lowest meaning maintenance costs are lower and the lifespan of the pump is maximised. It is very important to pay attention to the BEP when your pump is selected, as an oversized or undersized pump could cost you significant amounts of money.

How do I know what size pump and motor speed is correct for my system?

A clear picture of the pump system is required to make an accurate selection. The main pieces of information required include; a description of the application, bore of pipework, the fluid, flow rate and pressure/head. With these pieces of information, a pump can be sized correctly to ensure it delivers the required flow rate and pressure and that is also operates at its best efficiency point to lower lifetime costs. Knowing if the pump is running intermittently or continuously also allows the correct motor speed to be selected. For instance, a pump running continuously 24/7 will require a 4 pole motor rather than a 2 pole motor. Running the motor slower and oversizing the pump will reduce wear of the motor and the pump, therefore lowering maintenance costs during their lifetime.