Goulds 3420 Large Capacity Double Suction Pumps

Summary

Product identification

The Goulds 3420 is a Large Capacity Double Suction Pump, part of the Goulds 3400 series of centrifugal pumps.

Operating limits

• Capacities: to 65,000 GPM (14,762 m³/h)
• Heads: to 400 feet TDH (122 m)
• Temperatures: to 275˚F (135˚C)
• Working pressures: to 200 PSI (1379 kPa)

Mechanical / hydraulic

The Goulds 3420 pump is designed for heavy-duty industrial, municipal, and process services, featuring:

Standard Design Features (Goulds 3400 Series):

• Large inlet areas to reduce NPSH requirements and assure smooth, quiet flow.
• Stuffing box with packing as standard; a wide variety of mechanical seals (including cartridge and split type) are available.
• Positive liquid sealing of the shaft from pumpage between impeller and sleeves, and between sleeves and sleeve nuts.
• Renewable impeller wear rings, positively locked on impeller hubs, standard on large and extra-large capacity models (3420 & 3498).
• Double row thrust bearing for high axial thrust capability, positively positioning the rotating element.
• Labyrinth bearing protection, significantly reducing bearing contamination.
• Renewable casing wear rings to eliminate casing wear and maintain proper running clearances.
• Heavy duty shafts designed for minimum deflection, with renewable shaft sleeves available in various materials.
• Double suction impeller to minimize axial thrust, with polished waterways, fully machined exterior surfaces, and dynamic balancing.
• Heavy duty, rugged foot-mounted casings designed to resist external forces and vibration, 100% hydrostatically tested. Suction and discharge connections are in the lower half casing, allowing removal of the upper half casing without disturbing piping or driver.
• Balanced design with dual volute casing (standard on all 3420 sizes) combined with a double suction impeller for axial balance.

Model 3420 Specific Features:

• Sleeve bearings available.
• Grease or ring oil lubricated bearings.
• Packing or mechanical seals available (including cartridge and split type seals).
• Dual volute casings standard on all sizes.
• Labyrinth bearing protection standard.
• Alloy constructions not shown are also available.
• Shaft sleeve nuts threaded against rotation as standard.
• Vertical mounting available on some sizes.
• Impeller wear rings standard.

Materials of Construction (Model 3420):

• Bronze Fitted:
  • Casing: Cast Iron
  • Impeller: Bronze
  • Lantern Ring: Teflon
  • Packing: Graphite Impregnated Yarn
  • Packing Gland: Bronze
  • Mechanical Seal Gland: Cast Iron
  • Shaft: Carbon Steel
  • Shaft Sleeve Nut: Bronze
  • Shaft Sleeve: Bronze
  • Casing Wear Ring: Bronze
  • Bearing Housings: Cast Iron
  • Impeller Wear Ring: Bronze
  • Bearings: Steel (Anti-Friction)
• All Iron: Impeller (Cast Iron), Packing Gland (Cast Iron), Shaft Sleeve Nut (Cast Iron), Shaft Sleeve (Cast Iron), Casing Wear Ring (Cast Iron), Impeller Wear Ring (Cast Iron).
• 316 SS Fitted / All 316 SS: Casing (316 SS), Impeller (316 SS), Packing Gland (316 SS), Mechanical Seal Gland (316 SS), Shaft Sleeve Nut (316 SS), Shaft Sleeve (316 SS), Casing Wear Ring (316 SS), Impeller Wear Ring (316 SS).
• Shaft sleeve, casing wear ring, and impeller wear ring are also available in hardened/hard metal coated materials.

Dimensions: Dimensions are provided for various pump sizes (e.g., 12x14-15, 16x18-17/H, 18x20-30, 20x24-28/G/H, 24x30-32/G/H/N, 30x30-31/G, 30x36-42/G/H) including measurements for C, T, D, O, OH, S & Z, X, YY, HA, HB, and Weight in Lbs. (kg). All dimensions are in inches (mm) and are not to be used for construction or installation purposes. Standard rotation is right hand (CW), with optional left hand (CCW) rotation available. Steel casings will have 150#RF flanges. See the official PDF for exact tabulated values.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror