Goulds 3996 In-Line Process Pumps

Summary

Product Identification

The Goulds Model 3996 In-Line Process Pumps are designed for a total range of industry services, specifically for in-line applications within the Chemical Process Industries.

Key features include:

• Interchangeability: All parts (shaft, sleeve, mechanical seals, etc.) except the casing are fully interchangeable with Goulds Model 3196 STX and MTX pumps.
• X-Series Power Ends: These pumps utilize X-Series power ends, which are compatible with eight different Goulds process pump models, including the 3196, CV 3196, HT 3196, LF 3196, NM 3196, 3198, 3796, and 3996, to minimize inventory and reduce downtime.

Operating Limits

• Capacities: to 1400 GPM (318 m³/h)
• Heads: to 700 feet (213 m)
• Temperatures: to 500° F (260° C)
• Pressures: to 375 PSIG (2586 kPa)
• Maximum Liquid Temperature:
  • Grease Lubrication without Cooling: 250° F (121° C)
  • Grease Lubrication with Heat Flinger: 450° F (232° C)
  • Oil Mist Lubrication with Heat Flinger and Cooling: 500° F (260° C)
• Maximum Shaft Deflection: 0.002 in. (0.05 mm) at seal faces.

Applications

The Goulds 3996 pumps are suitable for a wide range of services, including:

• Caustic transfer
• Acid unloading
• Monomer/Polymer transfer
• Liquid nitrogen
• Liquid ammonia
• Reflux and light tower bottoms
• Waste acid recovery
• Pickle liquor circulation
• Chilled water
• Filter feed
• Condensate return
• General CPI services involving solids handling, stringy material, corrosives, and abrasives.

Electrical

• Motor: Standard NEMA C-Face Normal Thrust Motor.
• Power Limits (per 100 RPM):
  • ST Group: 1.1 HP (0.82 kW)
  • MT Group: 3.4 HP (2.6 kW)

Mechanical / Hydraulic

Design Features:

• In-Line Mounting: Minimal floor space required, reduced installation costs, and field alignment is not required.
• Flexibly Coupled: Conventional flexible spacer coupling.
• Integral Pump Bearings: All hydraulic loads are carried by the pump, not the motor. Bearings are sized for a 2-year minimum and 10-year average life under tough operating conditions. Regreaseable bearings are standard, with greased-for-life or oil mist lubrication options.
• Seal Chambers: TaperBore™Plus/BigBore™seal chambers for maximum sealing flexibility.
• Back Pull-Out Design: Facilitates ease of maintenance.
• External Impeller Adjustment: Maintains original high efficiency and provides long-term energy savings.
• Heavy Duty Shaft: Designed for minimum deflection—less than 0.002 in. (0.05 mm)—at seal faces.
• Streamlined Suction: Contoured suction baffle reduces turbulence, ensuring low NPSH requirements.
• Heavy Walled Casing: With ribbed suction and discharge nozzles to support pump and driver and resist pipe strain without distortion. ANSI class 150 flanges are standard, with class 300 flanges optional.
• Fully Open Impeller: Acknowledged as the best design for CPI services, handling solids, stringy material, corrosives, and abrasives. Back pump-out vanes minimize stuffing box/seal chamber pressure and reduce thrust.
• Safety: ANSI B15.1 coupling guard, ductile iron frame and motor support, and fully serrated flanges.
• Positive Sealing: Fully confined gasket at the casing joint protects the alignment fit from liquid.

Construction Details (Dimensions in inches and (mm)):

• Shaft (ST / MT):
  • Diameter at Impeller: 0.75 (19) / 1 (25)
  • Diameter in Stuffing Box/Seal Chamber (Less Sleeve): 1.375 (35) / 1.75 (45)
  • Diameter in Stuffing Box/Seal Chamber (With Sleeve): 1.125 (29) / 1.5 (38)
  • Diameter Between Bearings: 1.5 (38) / 2.125 (54)
  • Diameter at Coupling: 0.875 (22) / 1.125 (29)
  • Overhang: 6.125 (156) / 8.375 (213)
• Sleeve O.D. thru Stuffing Box/Seal Chamber (ST / MT): 1.375 (35) / 1.75 (45)
• Bearings:
  • Radial (ST / MT): SKF 6207 / SKF 6309
  • Thrust (ST / MT): SKF 5306 A/C3 / SKF 5309 A/C3
  • Bearing Span (ST / MT): 4.125 (105) / 6.75 (171)
  • Average L'10 Bearing Life: 87,600 hours
• Seal Chamber Bores (ST / MT):
  • BigBore™ Seal Chamber Bore: 2.875 (73) / 3.5 (89)
  • Stuffing Box Bore: 2 (51) / 2.5 (64)
• Casing Corrosion Allowance: 0.125 (3)

Sealing Solutions: Goulds engineered seal chambers are designed to accept a wide range of sealing arrangements, including:

• Single Inside Seal (with BigBore™ Seal Chamber)
• Conventional Double Seal (with BigBore™ Seal Chamber)
• Single Cartridge Seal (with TaperBore™ PLUS Seal Chamber)
• Double Cartridge Seal (with BigBore™ Seal Chamber)
• Double Gas Barrier Seal (with BigBore™ Seal Chamber for Gas Seals)
• Dynamic Seal Option: The ANSI PLUS™ Dynamic Seal can be fitted with a repeller between the stuffing box and impeller, eliminating the need for a mechanical seal and external seal water.

Engineered Seal Chamber Types:

• Type 1 Standard Bore: Designed for packing, also accommodates mechanical seals.
• Type 2 BigBore™: Enlarged chamber for increased seal life through improved lubrication and cooling.
• Type 3 TaperBore™ PLUS: Features lower seal face temperatures, self-venting and draining, and circulates solids and vapors away from seal faces.
• Type 4 Jacketed TaperBore™ PLUS: Maintains proper temperature control (heating or cooling) of the seal environment.
• Type 5 Jacketed BigBore™: Maintains proper temperature control (heating or cooling) of the seal environment.

Materials of Construction: Common materials include Ductile Iron, 316SS, CD4MCu, Alloy 20, Monel, Nickel, Hastelloy, and Titanium for major components like casing, impeller, and seal chambers. Other materials include SAE4140 steel for shafts, Teflon* for lantern rings and gaskets, Aramid Fiber with EPDM Rubber for casing gaskets, and Buna Rubber for O-rings and grease seals. *E.I. DuPont reg. trademark

Dimensions and Weights: The datasheet provides detailed dimensions (E, M, N, BE) and weights (less motor) for various pump sizes, ranging from 11/2x2-6 (190 lbs / 86 kg) to 4x6-13 (610 lbs / 277 kg). Minimum headroom required to remove the motor is 6 in. (152 mm). See the official PDF for exact tabulated values.

Performance Curves: Performance curves illustrating Total Head versus Capacity are available for 3500 RPM (60 Hz), 2850 RPM (50 Hz), 1750 RPM (60 Hz), and 1450 RPM (50 Hz) for various pump sizes. See the official PDF for detailed performance curves.

---

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

Official datasheet (PDF)

Lenntech datasheet mirror