API 674 Quintuplex Pumps Dynapro Pumps QD (Plunger) and QDP (Piston) Series are reciprocating pumps designed in compliance with API 674, Latest Edition.

Design Features and Benefits

Power End Frames

• Gray cast iron one piece construction for added strength and durability
• Symmetrical design allows for left-hand or right-hand drive and easy conversation
• Versatile design accepts V-belt, chain, gear, or clutch drive trains.

Crankshafts

• High strength forging steel construction is standard; forged alloy steel is available for special applications
• Designed for use with tapered roller bearings to carry higher crankshaft/rod loads.

Crossheads

• Circular full piston type crossheads evenly distribute rod load to power frame
• Polished stainless steel crosshead stubs for long seal life
• Double sealed crosshead stub seals to prevent oil loss and oil contamination
• Crosshead extensions connect to plungers outside of power frame for easier

maintenance.

Connecting Rods

• High strength cast steel construction
• Precision automotive type Babbitt lined journal bearings.

Lubrications

• Splash and gravity lubrication promotes lubrication to all moving parts, keeping the oil constantly circulated and cooled
• Oil sight gauge allows quick convenient observation of power end oil level when running or idle.

Fluid Cylinder

• High chrome steel material is standard; stainless steel, aluminum bronze, and duplex stainless steel are available as required
• Threaded NPT connections or flanged for higher flow rate are standard; other special connections available upon request
• Spring loaded valves for positive closing
• Large volumetric areas through seats for reduced fluid velocity and efficient fluid transfer
• ColmonoyTM coated steel plungers are standard; other coatings and materials are available as required.

Performance Envelope-
Design Standard – API 674, Latest Edition.
Design Pressure Rating – Up to 11000 psig.
Temperature Rating – Up to 90 °C.
Flowrate – Up to 1650 USgpm.