Operation counts vs HPU capacity and heat.
Size hydraulic power units for automatic HVM bollards with realistic duty. Define cycle profiles and EFO allowances (354), then apply thermal/derate for hot climates (337). The planner outputs energy budgets (517), heat load hints (516), and log templates that connect to KPIs and dashboards (542, 544). Attach results to specs and SAT readiness files (433, 638). Include one-sentence context that naturally links upward to the parent hubs (this section and the chapter hub). Add SIRA context with a link to SIRA Bollards (UAE) when relevant. Link installation pages only if helpful: What to Expect and Installation Guide.
Important: This is a general guide. For live projects we develop a tailored
Method Statement & Risk Assessment (MS/RA) and align with authority approvals (e.g., SIRA) where in scope.
924.1 Purpose
Match hydraulic units to lane duty, climate, and EFO needs for automatic HVM bollards (341, 512, 517).
The planner helps select an HPU that can sustain the requested operations per hour while preserving safety margins for EFO events. It joins duty-cycle math with temperature rise and enclosure considerations so lanes remain available during peaks, not just in lab conditions.
Use it alongside Hydraulic Power Units (512) and Energy Budget (517) to cross-check motor sizing, reservoir volume, and backup runtime. When designs include extreme ambient conditions, pull constraints from Hot Climate Design (337).
| Aspect | What matters | Where to verify |
|---|---|---|
| Performance | Rated system (bollard + foundation + power) | Global crash ratings |
| Operations | Duty cycles, fail-state, safety devices & measures | Installation Guide |
924.2 Inputs
Ops/hour, stroke times, mass/pressure, ambient, enclosure data (337, 516). Crash rated bollard lane context.
Capture: (a) lane demand profile (average vs peak Ops/hour), (b) raise/lower times and hydraulic pressure, (c) number of bollards per HPU, and (d) ambient/solar load plus enclosure IP/NEMA details from Enclosure Protection (516). Note any mandatory fail-state and local acoustic caps (see 546).
For incident modes, specify EFO count and cooldown. Add UPS kWh or generator availability (links: Power Failure Modes (518) and Supply & Sources (511)).
924.3 Method
Calculates duty/heat load, reservoir/accumulator sizing, and energy budgets (512, 517, 354).
The tool models motor-on time per cycle and converts to a duty cycle. It estimates hydraulic energy per stroke, multiplies by demand, and adds standby draw to produce a lane-level energy budget. Thermal rise is approximated with enclosure conduction/venting factors and derated per 337.
Hydraulic storage is sized via reservoir volume and accumulator capacity for EFO. Where multiple lanes share an HPU, the planner checks concurrency and suggests sequencing in the state machine (526) to avoid brownout.
924.4 Outputs
Duty margins, cooling needs, backup runtime targets, alerts (341, 517). Reliable HVM bollard service.
Primary outputs include: (1) duty margin vs motor/valve thermal limits, (2) predicted enclosure temperature and cooling recommendations (passive vent, fan kit, or sun-shield), (3) kWh/day and UPS autonomy minutes for incident ride-through, and (4) alerts for unsafe concurrency or undersized accumulators. Cross-reference Energy Budget (517) to finalize feeder and backup sizing.
924.5 Limits
Assumes healthy PM baseline; verify with SAT data (734, 636). Tune per site.
Calculations assume clean filters, correct pre-charge, and nominal viscosity. Degradation (oil aeration, clogged strainers, or weak solenoids) shortens duty margins. Validate on site with Performance & Duty Tests (636) and maintain using the Preventive Maintenance Plan (734).
924.6 Validation
Compare with commissioning logs and KPIs (631–636, 542). Evidence-backed.
During commissioning, log cycle times, peak current, and enclosure temperature against ambient. Export counters and health pings (541) and compare to KPI thresholds in KPI Set (542). Retain evidence in the SAT / Witness Procedure (638) pack.
924.7 Spares & maintenance
Suggest critical spares and PM cadence (842, 733). Sustains crash rated bollard availability.
Carry a lane-down kit: pump motor relay, valve coils, pressure switch, filter elements, and accumulator seals. Align intervals with Lifecycle & maintenance (842) and document in the O&M Manuals (733). Trend KPIs in Operational Dashboards (544) to trigger oil change or cooling upgrades.
924.8 Save/Export
Pack for submittals with parameters and versions (938, 911). Auditable.
Export the planner sheet with input table, version ID, assumptions, and results. File and name to the File Index & Naming Rules (911) and wrap into the Submission-Pack Guidance (938). Attach to the Specification Template (433) and SAT readiness list (638).
924.9 Related
See power failure and EFO pages (518, 354). Complete picture.
Combine this planner with Power Failure Modes (518) to set ride-through targets and EFO & overrides (354) to confirm accumulator energy and cooldown. For enclosure heat specifics, use the Heat-Load Estimator (926).
Related
External resources
924 HPU Duty/Energy Planner — FAQ
How do I estimate operations per hour for a mixed-traffic lane?
Start with observed peaks (e.g., shift change) and average flow. Use counters from commissioning (631) or SCADA/BMS logs (533) to calculate Ops/hour with 10–20% headroom. If lanes are ganged to one HPU, apply concurrency factors or sequence via the state machine (526).
What if enclosure temperature exceeds limits in summer?
Apply derating from Hot Climate Design (337): increase ventilation area, add a fan/thermostat kit, shade the enclosure, and review duty distribution across lanes. Verify with a thermal alarm point in the PLC and trend on dashboards (544).
How do I size accumulator energy for EFO?
Count the required EFO strokes without recharge, multiply the per-stroke hydraulic energy, then add a margin for worst-case viscosity. Set the pre-charge per the datasheet and validate timing in the EFO witness test (637).
Where should I place the exported planner in the submission pack?
Include it under the Calculations Snapshot and Energy Budget appendices, reference it in the Specification Template (433), and list the filename in the Submission-Pack index (938) for traceability during SAT (638).