ARO Ingersoll Rand PD10A-ASS-STT 1″ Metallic Diaphragm Pump

ARO Ingersoll Rand PD10A-ASS-STT Air-Operated Double Diaphragm Pump (PMP-240)

The ARO Ingersoll Rand PD10A-ASS-STT is a heavy-duty 1″ metallic Air-Operated Double Diaphragm (AODD) pump built for maximum efficiency, chemical resistance and stall-free operation. It is part of the well-known ARO EXP Series, including a rugged aluminum core section, and 316 stainless steel fluid caps, manifolds and wetted hardware. It has PTFE (Teflon) diaphragms and check balls and 316 stainless steel valve seats and handles harsh acids, solvents and viscous fluids with absolute reliability. Its bolted ribless design assures leak-free performance in challenging marine, chemical processing, and industrial plant applications.

Model Details

• Manufacturer: ARO / Ingersoll Rand
• Series: EXP Series (Expert Series)
• MPN (Manufacturer Part Number): PD10A-ASS-STT
• Internal Stock ID / SKU: PMP-240

Technical Details: ARO PD10A-ASS-STT

Features

1. Patented Unbalanced Air Valve – Provides stall-free, consistent shifting performance, no external maintenance needed.
2. Simul-Shift Valve Technology: Provides an ultra-positive, rapid shift signal to optimize pump efficiency and minimize air usage.
3. Superior Chemical Compatibility: 316 stainless steel and PTFE wetted parts resist corrosion when pumping aggressive industrial chemicals, acids and solvents.
4. Leak-Free Bolted Construction Ribless fluid caps minimize cracking and provide complete sealing for high-pressure cycles.
5. Anti-Icing Exhaust Design: Built-in quick dump exhaust valves direct cold air away from motor components to reduce freezing problems during continuous operation.

Applications

• Marine and offshore chemical fluid transfer and bilge scavenging
• Solvent recycling and paint/coating distribution lines
• Wastewater treatment chemical dosing (polymers, coagulants, acids)
• Ceramic slip, ink, and adhesive batching operations
• General plant-wide fluid transfer of corrosive or viscous media (up to 40,000 cPS)

Part Number Cross-References

• Ingersoll Rand / ARO Base SKU: PD10A-ASS-STT
• Industrial Supplier Code: PMP-240
• Global Marine Parts Reference: IMPA 591701
• Alternate Configuration Cross: PD10A-BSS-STT (Binary/Conductive options)

Marine Engineer Expert’s Guide

• Installation Caution: Always mount the pump on a rigid, flat surface using dampening vibration pads. Because this model utilizes a high-density aluminum center section combined with stainless steel wetted components, improper structural alignment of heavy 1-inch inlet/outlet piping can induce severe mechanical stress on the manifold flanges, risking premature thread or casing micro-fractures.
• Pneumatic Line Maintenance: Ensure your air supply line incorporates an active water separator and lubricator-free regulator (such as ARO kit 66073-2). Introduction of wet compressed air into the valve body will degrade cycle efficiency and trigger ice blockage across the quick-dump exhaust ports in high-humidity marine atmospheres.
• Dry Priming Operations: The PD10A-ASS-STT boasts an impressive 19-foot dry suction lift capability. If commissioning the pump after dry storage, slowly throttle the air inlet pressure down to 30–40 PSI to wet the PTFE check balls smoothly before ramping up to normal operational thresholds (80–100 PSI).

Frequently Asked Questions

What maximum fluid viscosity can the ARO PD10A-ASS-STT handle?

The pump handles fluids with viscosities up to 40,000 cPS, provided the suction line is appropriately sized and flooded or positioned close to the source to avoid starvation.

Are the PTFE diaphragms suitable for abrasive slurries?

While PTFE delivers exceptional chemical resistance against harsh acids and aggressive solvents, it is less elastic than Santoprene or Buna-N. For highly abrasive solid-laden slurries, check your particle dimensions (limit to max 1/8 inch) or consider alternate long-life composite diaphragm configurations.

How do I prevent icing during continuous heavy-duty cycling?

The integrated ARO quick-dump exhaust valve layout explicitly prevents cold expansion air from lingering inside the motor housing. However, installing an external line air dryer upstream guarantees complete immunity to freezing temperatures in sub-zero operational environments.