Identification
Horizontal single-stage overhung process pump (OH1, foot-mounted), back pull-out, by ITT Goulds Pumps — in continuous production since 1961 and now in the i-FRAME generation (bearing housing with embedded monitoring). It is the archetype of ASME B73.1: standardized dimensions interchangeable across manufacturers and generations — the spare-parts argument that sustains the "ANSI pump" standard in the Americas.
Position on the six axes
| Axis | Position |
|---|---|
| Hydraulics | Radial (single-stage, low ) |
| Stages | 1 |
| Configuration | OH1 (overhung, foot) |
| Sealing | Sealed — seal chamber for B73.1/API 682 plans |
| Standard | ASME B73.1 |
| Service | Chemical and general industrial process |
Ranges and construction
| Parameter | Catalog value |
|---|---|
| Flow | up to ~1,590 m³/h (7,000 gpm) |
| Head | up to ~223 m (730 ft) |
| Temperature | up to 371 °C (700 °F) |
| Pressure | up to ~26 bar (375 psig) |
Back pull-out construction (the rotating assembly comes out without disturbing the piping), open impeller with external clearance adjustment (light-solids and corrosive services), a wide materials chart (ductile, 316, CD4MCu, nickel alloys). The i-FRAME generation adds a vibration/temperature sensor on the bearing housing and an extended power-end warranty.
Line variants
| Variant | What it solves |
|---|---|
| 3196 (STi · MTi · LTi · XLT-i) | The same ANSI hydraulics on 4 power-end frames of increasing size |
| LF 3196 | Low flow / high head with dedicated hydraulics — avoids running the standard 3196 far from BEP |
| HT 3196 | High temperature (thermal services up to the line limit, 371 °C / 700 °F) |
| CV 3196 | Recessed (vortex) impeller for solids and fibres |
| 3198 | PFA-lined internals for severe chemicals |
Catalog materials: ductile iron, 316SS, CD4MCu (duplex), Alloy 20, Hastelloy C — the chemistry chart that sustains the standard in chemical plants.
Differentials and points of attention
- i-FRAME / i-ALERT: factory-embedded vibration + temperature sensor on the bearing housing, with local alarm and app readout — native continuous monitoring on the ANSI workhorse.
- Open impeller with external clearance adjustment: restores volumetric efficiency without disassembling the pump — but the adjustment is mandatory after intervention and for service temperature (official IOM procedure); wrong clearance = lost efficiency or contact.
- The classic ANSI-class point of attention (rotating-equipment literature): smaller groups have a more slender shaft — in severe service, check deflection (L³/D⁴) and consider the next frame group up.
Where it stands out / limitations
Stands out as the chemical workhorse: a giant installed population, parts anywhere, failure history documented over decades — the lowest-risk choice for B73.1 service. Limitations: it is a B73.1 platform — for hot/high-pressure hydrocarbons the step up is an API 610 OH2 (e.g., Flowserve HPX); the open impeller gives up some efficiency versus closed designs.
Official documentation
- 3196 i-FRAME product page — specifications, curves and selection (PumpSelect).
- IOM manuals and brochures in the manufacturer's literature section (D05 — always the official source).
Reliability
Pump manufacturers do not publish catalog MTBF — the hard data comes from the field. For the US B73.1 population the reference is ~2.5 years average MTBF, 4.5+ for excellence (Budris — see "Reliability in numbers" in the Centrifugal Pump handbook). The 3196 is frequently the baseline of those studies precisely because of its installed population; the i-FRAME was born to attack the no. 2 failure item (bearings) with embedded monitoring.