Black industrial double diaphragm pump with green seals and metal fittings on a white background

WA Series

1-1/2 Inch WA Series Plastic Air Operated Double Diaphragm Pump

The WA6661X is the 1-1/2 inch polypropylene pump in the WA Series, designed for chemical transfer where corrosion resistance matters. It moves up to 100 GPM, which is 378.5 LPM, at up to 120 psi or 8.3 bar, passes suspended solids to 6.4 mm and lifts 4.27 m dry. The thick walled injection molded fluid casings and bolted construction prevent leaks, while the polypropylene body resists acids, alkalis and solvents that attack metals. The air end is lube free and stall free, so it starts under load and runs continuously without maintenance.

Maximum flow rate	100GPM(378.5LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	1-1/2" ANSI/DIN Flange
Fluid outlet	1-1/2" ANSI/DIN Flange

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Electroplating And Surface Finishing Chemical Processing Water And Wastewater Treatment

Key Benefits

What The 1-1/2 Inch Polypropylene Build Buys You

Chemical resistance, leak prevention and low maintenance are the key advantages of this model over metallic versions.

Chemical Resistance Without Sacrificing Flow

The 378.5 LPM flow is higher than the 1-1/2 inch metallic WA pump at 340.7 LPM, so you get more volume without switching to metal.

Bolted Construction Prevents Leaks

This design allows for full inspection of the ball check and diaphragm without disassembling the entire pump.

No Oil Mist In The Work Area

This is critical in clean rooms, food processing, and areas where oil contamination is a risk.

Easy Access For Maintenance

This allows for quick replacement of elastomers and inspection of the diaphragm without a full teardown.

Lighter Than Metallic Alternatives

This makes it easier to handle during installation and maintenance, especially on elevated platforms.

Flanged Connections For Easy Piping

This reduces installation time and eliminates the risk of leaks at threaded joints.

Who It Is For

Who Buys This Pump

This pump is chosen when the fluid is chemically aggressive and the plant needs a reliable, low maintenance transfer solution.

Chemical plants transferring acids, alkalis, and solvents between storage tanks and process lines
Pharmaceutical and biotech labs handling shear-sensitive formulations and cleaning fluids
Food and beverage facilities processing condiments, syrups, and cleaning agents
Waste water treatment plants moving electroplate liquid and chemical dosing streams
3D printing shops transferring resin and support material mixtures
Maintenance teams who need a pump that won't corrode in a solvent or acid spill

Problems It Solves

Problems This Pump Is Bought To Fix

Most buyers come to this pump because their current system fails at one of these five points.

A metal pump corrodes in acid or alkali, while polypropylene resists both without degradation
A threaded joint leaks under pressure, while the bolted casing prevents that failure
A pump requires oiling, and the oil contaminates the fluid, while this pump is lube free
A pump fails after a few months due to salt water or chemical attack, while polypropylene lasts longer
A pump is too heavy to move between tanks, while 28.1 kg is manageable by two people

Application Scenarios

Where It Ends Up In A Plant

01

Chemical Transfer Between Tanks

The pump handles aggressive fluids without corrosion, and the flanged connections allow for quick piping changes between vessels.

02

Tank Cleaning And System Flush

It can be run dry and dead headed, so it flushes lines and tanks without damage, even when the fluid is abrasive or corrosive.

03

Waste Water Chemical Dosing

It delivers consistent flow to dosing tanks, even when the supply tank runs low, and can be left on for long periods.

04

Pharmaceutical Formulation

The leak-free construction and choice of medical grade Santoprene diaphragm ensure no contamination during batch mixing.

Technical Features

How The Air End Is Built

The WA Series uses a separate platform from the DP3X. It is built for chemical resistance and long service life.

Bolted Fluid Casing
The polypropylene fluid casing is bolted to the center section, not glued or welded. This prevents leaks from seal failure and allows for full access.
Lube Free Air System
No lubricator is fitted. The air distribution system is self lubricating, so there is no oil mist and no maintenance task.
Stall Free Operation
The air end shifts cleanly and quickly, so the pump starts under load and does not hang at mid stroke.
Flanged Fluid Connections
1-1/2 inch ANSI/DIN flanges match standard piping, so the pump can be bolted directly into a system without adapters.
Selectable Wetted Materials
The model code allows selection of diaphragm, ball check, seat and hardware materials. This includes Viton, PTFE, Hytrel, Santoprene and medical grade options.
Interchangeable Installation Envelope
Port positions and mounting flange spacing are compatible with major AODD brands, so the pump fits where the old one sat.

Specifications

Published Performance

Transcribed from the performance table Nuodean publishes for this model in the series catalogue.

Maximum flow rate	100GPM(378.5LPM)
Maximum operating pressure	120psi(8.3bar)
Suspended solids max diameter	1/4"(6.4mm)
Fluid inlet	1-1/2" ANSI/DIN Flange
Fluid outlet	1-1/2" ANSI/DIN Flange
Air inlet	1/2"BSPT(1/2"NPT Available On Request)
Maximum dry suction lift	14feet(4.27m)
Sound level	70psi 60 cycles/min. 77.7db(A)
Weight	62 lbs(28.1kg)
Model series code	WA6661X, WA6661X X, WA6661X X X

Materials

Material Options

Set in the model code. Ask us if you need a combination the code allows but the sheet does not show.

Wetted body material	Polypropylene

Performance figures are transcribed from the Nuodean data sheet for this pump. Flow is measured at the pump discharge with water at ambient temperature; your duty point depends on air supply pressure, suction conditions, fluid viscosity and discharge head. Ask our engineers to confirm the duty point before you order.

Quality Control

Before It Is Crated

Every pump is run on air before it leaves, so the shift behaviour is checked rather than assumed
Sound level is published for the model at 70 psi and 60 cycles per minute so you can hold us to it
Ball, seat and diaphragm materials are checked against the ordered model code at assembly
The pump ships with the data sheet and both the fluid section and air section part lists

Customization

What You Can Change

Diaphragm in Viton, PTFE with Santoprene backing, Hytrel, Santoprene, Nitrile, Medical Grade Santoprene, Neoprene or EPDM
Ball check in Viton, PTFE, EPDM, acetal, polyurethane, stainless steel, Hytrel or Santoprene
Seat in aluminum, 316 stainless steel, PVDF, carbon steel, hard stainless steel, Santoprene, Hytrel or nitrile
Center section in aluminum or cast iron
Flange material in polypropylene or PVDF
Air inlet in 1/2 inch BSPT or 1/2 inch NPT (on request)

Comparison

Against The Alternatives

Where this pump wins and where you should be buying something else.

Versus the 1-1/2 inch metallic WA pump	The metallic version at 23.4 kg (aluminum) or 38.3 kg (stainless steel) is stronger for abrasive slurry, but the polypropylene version at 28.1 kg is lighter and handles corrosive fluids that would eat metal.
Versus the 2 inch plastic WA pump	The 2 inch model gives 548.8 LPM, which is more than double the flow, but it weighs 62 lbs and needs a larger air line. Choose the 1-1/2 inch when 378.5 LPM is enough and space or weight is a concern.
Versus the 1 inch plastic WA pump	The 1 inch model at 177.9 LPM is smaller and lighter, but the 1-1/2 inch gives 378.5 LPM and handles larger solids. Use the 1 inch only when flow is under 150 LPM and space is tight.
Versus the 1-1/2 inch DP3X aluminum pump	The DP3X aluminum pump at 29.6 kg gives 651 LPM, which is more than double the flow. Choose the WA pump only when chemical resistance is needed, not when flow is the priority.
Versus a centrifugal pump	The centrifugal is cheaper to run on clean, high flow duty. This pump wins when the fluid carries solids, the tank runs dry, or the area cannot have a motor.
Versus a 1-1/2 inch cast iron WA pump	The cast iron version at 36.1 kg is stronger for abrasive slurry. The polypropylene version is the better buy when the fluid is corrosive and weight matters.

Use Guide

Getting The Best Out Of It

Five things that decide whether this pump does 378.5 LPM or half of it.

Use Full Air Supply
Flow follows air. Use a 1/2 inch inlet, keep the hose short, and confirm the compressor can hold pressure at the flow the pump asks for.
Do Not Throttle The Suction
Throttle the discharge or the air, never the suction. Starving the suction causes cavitation and shortens diaphragm life.
Match The Elastomer To The Fluid
Diaphragm and ball material is chosen in the model code. Get the chemistry right and the pump lasts. Get it wrong and nothing else you do will save it.
Keep Suction Lift Honest
The published 4.27 m is a dry lift figure. Priming a flooded suction is always easier, so place the pump below the fluid level when possible.
Stock The Repair Kit
Order the WA6661X-Flu50 kit, coded for your diaphragm and ball material. It covers the ball check, seat, diaphragm and gaskets.

Documents

Documents For This Pump

Straight from Nuodean's own literature: series catalogues.

PDF WA Diaphragm Pump Catalogue Series Catalogues PDF 4.0 MB Download

Need a 2D or 3D CAD model of this pump? CAD on request via WhatsApp.

Answers

1-1/2 Inch WA Series Plastic Air Operated Double Diaphragm Pump FAQ

What flow will this pump actually give me?

100 GPM, which is 378.5 LPM, is the maximum with a free discharge and full air supply. Real duty points are lower. Send us the discharge head and the air pressure you can hold and we will tell you where on the curve you land.

Can it run dry?

Yes. An air operated double diaphragm pump can be run dry and can be dead headed against a closed valve without damage. That is the main reason plants choose one over a centrifugal pump.

What is the largest solid it will pass?

1/4 inch, which is 6.4 mm, on the suspended solids figure from the data sheet. If your fluid carries bigger solids, look at the 3 inch models at 9.5 mm or the heavy duty flap valve pump at 50 mm.

Will it replace another brand of 1-1/2 inch AODD pump?

Usually yes. The WA Series pumps are built so that installation dimensions and footprint are compatible with other brands. Send a photo of the nameplate and the pipework and we will confirm before you buy.

Which diaphragm should I order?

PTFE with a Santoprene backing for aggressive solvents and acids, Santoprene for general duty and long flex life, Viton for hot oils and aromatics, nitrile for petroleum products. Tell us the fluid and the temperature and we will put the right code on the quotation.

How loud is it?

77.7 dB(A) at 70 psi and 60 cycles per minute, as printed on the data sheet. Slower cycling is quieter, and a piped exhaust takes more off.

What connections does it come with?

Fluid inlet and outlet are 1-1/2 inch ANSI/DIN flanges. The air inlet is 1/2 inch BSPT female, with 1/2 inch NPT available on request.