Qingdao Nuodean Pump Co Ltd — air operated double diaphragm pumps since the DP series
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Nuodean AODD pumps for electroplating and surface finishing
Industry Application

AODD Pumps For Electroplating And Surface Finishing Lines

Electroplate liquid, acid and alkali bath transfer, filtration loops and rinse tank duty are named applications in our catalogues. These duties expose pumps to aggressive chemistry and fumes that make electric motors unsafe and metal pumps unsuitable.

Talk To An Engineer See Recommended Pumps
Pain Points

What Goes Wrong In A Plating Shop Pump Duty

Three failure modes dominate early pump replacement in plating lines.

The Pump Dissolves In The Bath

Aluminum, cast iron and even stainless steel corrode in hydrochloric acid, sulfuric acid and caustic soda. A pump with metal wetted parts fails within weeks, and the fluid contamination leads to plating defects.

The Electric Motor Fails In The Fume Zone

Fumes from acid baths and plating solutions are corrosive to electrical components. An electric motor in a classified area requires explosion-proof certification, which adds cost and complexity.

The Pump Loses Prime In The Rinse Tank

Rinse tanks are often drained below the pump level. A pump that cannot self prime from a dry lift of 4.6 meters cannot empty the tank without priming assistance.

What Buyers Need

What Plating Buyers Actually Specify

The specification usually comes down to six lines, and all six are settled in the model code before the pump is built.

  • Non-metallic wetted parts, polypropylene or PVDF, for acid and alkali baths and electroplate liquids
  • PTFE faced diaphragms and PTFE or PVDF check balls for long life in aggressive chemistry
  • No electric motor in the area, so the pump runs on plant air and avoids fume exposure
  • Dry running and dead heading tolerated as normal operation, with no overheating or seal failure
  • Self priming with a real dry suction lift of at least 4.27 meters to empty drums and rinse tanks
  • Published drawings and part lists so a plant can hold the right spares before a shutdown
Drop In Replacement And RetrofitPump Selection And SizingAbrasive And High Solids Transfer
Front view of a gray industrial double diaphragm pump with flanged connections and a central air valve.
Typical Duties

Typical Duties On A Plating Line

01

Acid And Alkali Bath Transfer

Transferring acid or alkali between tanks without metal contact, with the pump handling solids like scale or sludge in the fluid.

02

Rinse Tank Emptying

Self priming from ground level to empty rinse tanks after each batch, with dry running at the end of the cycle.

03

Filtration Loop Circulation

Circulating fluid through filters in a closed loop, where the pump must handle air entrainment and maintain flow under dead head.

04

Electroplate Liquid Transfer

Moving plating solution between storage and process tanks, where contamination from metal parts is unacceptable.

How We Work

How We Get From Enquiry To Pump

Four steps. The first one is the only one that matters, and it is the one most enquiries skip.

  1. Name The Fluid Properly

    Chemical name, concentration and temperature. Sulfuric acid at 10 percent and at 96 percent are different pumps, and so is the same acid at 20 degrees and 80 degrees.

  2. Fix The Wetted Materials

    We set the body, seat, ball and diaphragm against the chemistry, then check the hardware and the connection thread, since bolts and unions see the spill even if they do not see the fluid.

  3. Set The Duty Point

    Flow at your discharge head with your available air pressure. That is what decides the port size, not the size of the pipe you already have.

  4. Agree The Spares Package

    One air section kit and one fluid section kit coded to your elastomer choice, so the first failure is a fifteen minute job rather than a three week wait.

Supply And Delivery

What Ships With The Pump

Related Guides

Guides For Plating Duty

Working Principle

How An Air Operated Double Diaphragm Pump Works

Follow one full stroke through the pilot valve, the major air valve and both liquid chambers, and the rest of the pump stops being mysterious.

 Buying Guide

How To Size An Air Operated Double Diaphragm Pump

Sizing an air diaphragm pump from the existing pipe size or the headline maximum flow guarantees poor performance. Here is how to select the right displacement and port size from actual duty conditions.

 Material Guide

Aluminum Cast Iron Stainless Steel or Polypropylene Pump Body

Compare aluminum, cast iron, stainless steel and non metallic bodies by fluid, duty and weight, not by habit.

Answers

Electroplating And Surface Finishing Pump FAQ

Which pump should I use for hydrochloric acid in a rinse tank?

Use a 1 inch or 1-1/2 inch non-metallic pump with polypropylene or PVDF body, PTFE faced diaphragms, and PTFE check balls. The dry suction lift of 4.27 meters allows self priming from ground level.

Can the pump handle a fluid with suspended solids?

Yes, the non-metallic pumps pass up to 6.4 mm solids. For heavier solids, the flap valve pump is available, but it is not listed here. Confirm the solid size and concentration before selecting.

Is the pump safe in a fume-exposed area?

It is air driven with no electric motor, which makes it suitable for areas with corrosive fumes. The pump body is non-metallic, so it does not corrode in acid vapors.

What is the maximum pressure the pump can handle?

All listed pumps are rated for 8.3 bar (120 psi) maximum operating pressure. This matches the pressure required for bath transfer and filtration loops in plating lines.

How do I prevent fluid from entering the air system?

A torn diaphragm allows fluid to enter the air line. Inspect the exhaust line after each cycle. A wet exhaust indicates a failed diaphragm before it contaminates the air system.

Send Us The Chemistry And The Duty

Fluid, concentration, temperature, flow and discharge head. We will come back with the wetted part list, the model code and a price.

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