HERPS-VOL-04 — Revision D R2.0
Hybrid Energy Recovery Pump System (H.E.R.P.S)
The H.E.R.P.S Revision D R2.0 pump bearing system provides the mechanical support, axial location, radial restraint, controlled thermal growth, lubrication and condition-monitoring architecture for the three-stage centrifugal pump rotor.
Revision D uses a two-support arrangement consisting of a drive-end locating bearing pair and a non-drive-end floating bearing. This allows the rotor to remain accurately positioned while accommodating controlled differential thermal growth through the floating end.
| Parameter | Revision D R2.0 Baseline |
|---|---|
| Machine Architecture | Horizontal three-stage centrifugal industrial water pump |
| Rated Duty | 150 L/s at 80 m TDH |
| Nominal Pump Speed | 2,900 rpm |
| Controlled Speed Range | 1,500–3,600 rpm, subject to validated exclusion bands |
| Main Drive Context | 160 kW liquid-cooled high-efficiency SynRM / compliant equivalent baseline |
| Bearing Arrangement | Drive-end locating / non-drive-end floating |
| Common Pump / Motor Axis | Y = 0; Z = +800 mm |
| Minimum Local Bearing Service Access | ≥400 mm at each bearing housing |
The drive end establishes the principal axial datum for the pump rotor and carries radial loading together with residual bidirectional axial thrust remaining after the pump's hydraulic thrust-balancing system.
| Feature | Revision D Baseline |
|---|---|
| Bearing Family | 7314-class angular-contact bearings |
| Arrangement | DB / back-to-back locating pair |
| Quantity | 2 |
| Nominal Envelope per Bearing | 70 mm bore × 150 mm OD × 35 mm width |
| Primary Function | Radial support, residual bidirectional thrust and rotor axial datum |
| Housing Bore | 150 H7 design-development interface |
| Temperature Monitoring | Independent Pt100 monitoring at each DE bearing row |
The non-drive-end bearing is intentionally retained as the floating radial support. It supports the rotor while allowing controlled axial thermal growth and is not intended to become a second fixed axial datum.
| Feature | Revision D Baseline |
|---|---|
| Bearing Family | NU314-class cylindrical-roller bearing |
| Quantity | 1 |
| Nominal Envelope | 70 mm bore × 150 mm OD × 35 mm width |
| Function | Radial support with controlled axial thermal float |
| Housing Bore | 150 H7 design-development interface |
| Temperature Monitoring | Pt100 bearing-temperature channel |
| Lubrication Baseline | ISO VG46 oil-bath system |
The bearing architecture works with the pump hydraulic system rather than functioning as an isolated component. Hydraulic thrust is reduced through the pump's balancing arrangement before residual axial loading reaches the drive-end locating pair.
Radial hydraulic reactions, rotor weight, impeller unbalance, coupling influence and transient forces pass through the pump shaft journals into the DE and NDE bearing supports.
| Feature | Drive End | Non-Drive End |
|---|---|---|
| Development Envelope | 320 × 300 × 310 mm | 280 × 300 × 310 mm |
| Bearing Bore | 150 H7 | 150 H7 |
| Material Family | 17-4PH or qualified coated cast-steel / ductile-iron family | Same qualified material family |
| Oil Volume Baseline | 3.5 L effective | 2.5 L effective |
| Local Removal Clearance | ≥400 mm | ≥400 mm |
Mounting faces and bearing bores are coordinated to the common pump shaft datum so the housing system does not induce shaft bending or compromise rotor alignment.
| Control | Revision D R2.0 Interface |
|---|---|
| Nominal Bearing Journal | 70 k6 |
| Journal Surface Finish | Ra ≤0.4 µm |
| Journal TIR | ≤0.015 mm |
| Shaft Straightness | ≤0.03 mm over the 1,600 mm shaft baseline |
| Assembled Rotor TIR | ≤0.05 mm at impeller OD |
The DE locating / NDE floating arrangement prevents the normal thermal growth of the shaft and rotor from becoming unintended bearing thrust.
Both Revision D bearing housings use an oil-bath lubrication baseline, with the drive-end housing incorporating constant-level oil control and direct visual level indication.
| Lubrication Feature | Drive End | Non-Drive End |
|---|---|---|
| Primary Lubrication | Oil bath | Oil bath |
| Lubricant Baseline | ISO VG46 | ISO VG46 |
| Oil-Level Control | Constant-level oiler + sight glass | Sight glass |
| Breathing | Filtered / desiccant-filtered option | Filtered / desiccant-filtered option |
| Drain | Magnetic drain | Magnetic drain |
| Condition Sampling | Dedicated sample provision preferred | Dedicated sample provision preferred |
Revision D incorporates maintainable provisions for direct oil-level inspection and condition-based lubrication monitoring.
| Parameter | Revision D Development Baseline |
|---|---|
| Labyrinth Shaft Diameter | Ø80 mm |
| Radial Clearance | 0.25–0.35 mm development baseline |
| DE Arrangement | Labyrinth at bearing-housing shaft penetration |
| NDE Arrangement | Equivalent labyrinth interface |
| Acceptance Principle | No rub throughout validated speed, runout, thermal-growth and rotor-deflection envelope |
Revision D provides three dedicated Pt100 bearing-temperature channels:
Final alarm and trip thresholds remain coordinated with the selected bearing, lubricant, controls architecture and validated FAT operating signatures rather than being assigned arbitrarily.
Both bearing housings provide orthogonal monitoring positions so rotor and bearing condition can be trended across the machine's released operating envelope.
| Location | Monitoring Direction |
|---|---|
| Drive End | X / horizontal |
| Drive End | Y / orthogonal |
| Non-Drive End | X / horizontal |
| Non-Drive End | Y / orthogonal |
Baseline vibration signatures established during commissioning and acceptance testing provide the reference for later condition-based maintenance and degradation assessment.
Revision D explicitly coordinates the bearing architecture with the variable-frequency drive and motor grounding system so electrical bearing-current exposure can be addressed where engineering analysis determines that mitigation is required.
Revision D incorporates bearing serviceability into the package layout instead of treating it as an afterthought.
Revision D maintenance uses measured operating history and accepted commissioning signatures rather than relying solely on instantaneous alarm thresholds.
Revision D intentionally distinguishes between established mechanical interfaces and values that still require selected-vendor data or engineering validation.
HERPS-VOL-04 Revision D R2.0 is a consolidated design-development bearing, housing and lubrication volume. It defines the bearing architecture, functional interfaces, lubrication functions, monitoring provisions, maintenance philosophy and validation boundaries.
It is not represented as fabrication-final or as-built. Supplier-final bearing details, exact preload and endplay, final bearing-life result, final lubricant product and fill level, supplier housing internals, selected electrical bearing-current mitigation hardware and other vendor-controlled refinements remain subject to the applicable engineering and validation process.
Final measured configuration becomes authoritative only after the applicable testing, acceptance and as-built configuration process.
The pump bearing, rotor-support, housing and lubrication architecture is one subsystem within the complete H.E.R.P.S Revision D multi-volume conceptual engineering platform.
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