Qingdao Nuodean Pump Co Ltd — air operated double diaphragm pumps since the DP series
Request A Quote
HomeAll Products
DP3X Series AODD Pumps1" DP3X Diaphragm Pumps1-1/2" DP3X Diaphragm Pumps2" DP3X Diaphragm Pumps3" DP3X Diaphragm PumpsWA Series AODD Pumps1" WA Diaphragm Pumps1-1/2" WA Diaphragm Pumps2" WA Diaphragm Pumps3" WA Diaphragm PumpsSpecialty Diaphragm PumpsZG Series AODD PumpsSpare Parts For Diaphragm Pumps
Chemical ProcessingPaints Inks And CoatingsMetalworking And Machine ToolsWater And Wastewater TreatmentElectroplating And Surface FinishingMining And Coal HandlingFood And Pharmaceutical
Drop In Replacement And RetrofitPump Selection And SizingAbrasive And High Solids TransferSpare Parts And Maintenance Program
Knowledge CenterDownload CenterAbout NuodeanContact
Nuodean AODD pumps for mining and coal handling
Industry Application

AODD Pumps For Coal Mine Dewatering And Slurry Transfer

Coal mines face water seepage, slush and slurry from underground pits. The transfer of these fluids happens in confined spaces where electrical equipment is restricted and maintenance access is limited. A pump must survive abrasion, run dry, and operate on plant air without fail.

Talk To An Engineer See Recommended Pumps
Pain Points

What Goes Wrong In Underground Slurry Transfer

Three failure modes dominate early pump replacement in coal mine environments.

The Pump Clogs On Solids Larger Than The Passageway

Coal slush and pit water carry particles up to 50 mm in diameter. Standard check valves with tight clearances fail when these solids enter the fluid path, blocking flow and requiring manual intervention in a hazardous area.

The Body Wears Out From Abrasive Fluids

Slurry containing coal fines and sand erodes thin-walled materials. Pumps with non-metallic bodies or thin castings fail quickly under continuous abrasive duty, leading to leaks and unplanned shutdowns.

The Pump Fails When The Suction Runs Dry

Dewatering pits empty during operation. Pumps that lose prime or overheat when dry cannot restart without intervention, and the operator must monitor levels constantly in a high-risk environment.

What Buyers Need

What Mining Buyers Actually Specify

The specification is based on three physical limits: solids size, body material and suction lift. These define the model before any quote is issued.

  • A flap valve design for handling solids up to 50 mm, which is the maximum size in the Nuodean catalogue for any model
  • Cast iron or aluminum body for abrasion resistance in coal slurry and water seepage, with the 3 inch cast iron pump rated for 8.3 bar pressure
  • Dry suction lift of at least 8.3 m to empty pits and drums from ground level without priming
  • No electric motor in the area, so the pump runs on compressed air and avoids hazardous area classification
  • Self priming and dry running tolerance as standard, not an exception
  • Published drawings and part lists so the mine can stock repair kits before the next shutdown
Drop In Replacement And RetrofitPump Selection And SizingAbrasive And High Solids Transfer
A black industrial diaphragm pump with green accents and a red port cover on a white background.
Typical Duties

Typical Duties On A Coal Mine Site

01

Pit Dewatering And Water Seepage Transfer

Pumps placed at the bottom of mine pits to remove water seepage. The heavy duty flap valve pump with 8.3 m dry suction lift empties the pit without priming and handles solids up to 50 mm.

02

Coal Slush And Slurry Transfer

Moving coal slush from underground hoppers to surface bins. The 3 inch cast iron pump handles 897 LPM with 120 psi pressure, and the aluminum model offers lighter weight for mobile setups.

03

Bulk Tank And Sump Emptying

Draining sumps and storage tanks where the fluid level drops below the pump inlet. The 3 inch aluminum pump with 5.4 m dry suction lift operates safely even when the tank is nearly empty.

04

System Flush And Line Cleaning

Flushing slurry lines between batches. The pump swallows air, then liquid, then air again without damage, and the flap valve design resists clogging.

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 And Its Solids Size

    Coal slush, water seepage or slurry. The maximum particle size determines the pump type. For 50 mm solids, only the heavy duty flap valve pump is suitable.

  2. Fix The Body Material

    Cast iron for high abrasion resistance in continuous duty, aluminum for lighter weight and lower cost. The 3 inch models are rated for 8.3 bar pressure, which matches the maximum operating pressure in the catalogue.

  3. Set The Duty Point

    Flow at your discharge head with your available air pressure. The 3 inch cast iron pump delivers 897 LPM at 120 psi, and the 2 inch cast iron pump handles 651 LPM with a 120 psi rating.

  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 Mining 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

Mining And Coal Handling Pump FAQ

Which pump handles 50 mm solids?

Only the Heavy Duty Flap Valve Diaphragm Pump in the Nuodean catalogue handles solids up to 50 mm. It has a dry suction lift of 8.3 m and is rated for 8.3 bar pressure. No other model in the range supports this size.

Can the pump run dry in a mine?

Yes. All Nuodean AODD pumps are designed for dry running and dead heading as normal operation. The heavy duty flap valve pump handles 50 mm solids and runs dry without damage.

Is cast iron suitable for coal slurry?

Yes. The 3 inch cast iron pump is rated for 8.3 bar pressure and is suitable for abrasive coal slurry. The 2 inch cast iron pump has no published dry suction lift, so it is not suitable for dewatering pits.

What is the maximum flow for a 3 inch pump?

The 3 inch cast iron and aluminum pumps both deliver 897 LPM at 120 psi. The flow is limited by the port size and air pressure, not the body material.

How do I prevent a diaphragm failure from contaminating the air system?

The exhaust port should be piped away from the pump and inspected regularly. A wet exhaust indicates a torn diaphragm. Catching it early prevents fluid from entering the air end.

Send Us The Solids Size And The Duty

Fluid type, maximum solids size, flow and discharge head. We will come back with the model code, wetted part list and a price.

Chat On WhatsApp [email protected]?subject=Inquiry%3A%20Mining%20And%20Coal%20Handling%20pump%20selectionAll Products
[email protected]?subject=Inquiry%3A%20Mining%20And%20Coal%20Handling%20pump%20selection
Language