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HydroStorm

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Oil & water separation

HydroStorm

Full retention. Coordinated stormwater treatment.

Forecourt spill retention up front. General site stormwater treatment downstream. Two drainage streams, brought together in one extended FRP unit.

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PROTECTOR / HYDROSTORMHydroStorm product illustration
Engineered for your application.01 / PRODUCT

The system, explained

Full retention. Coordinated stormwater treatment.

HydroStorm combines a front full retention and spill-storage chamber, a middle sediment chamber and a downstream coalescing bypass separator. Forecourt runoff enters through the end inlet; general site runoff enters separately through the side. Treatment duty, usable spill storage and peak bypass flow are specified separately.

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How it works

Purpose in every detail.

01

Retain forecourt spills

The front chamber captures sediment and free oil. The water-supported ACD ball descends as the oil layer deepens and closes the forecourt transfer for spill recovery.

02

Treat site runoff

A separate full-size side inlet feeds the sediment chamber. Water passes down through the coalescing filter, then rises to the outlet.

03

Manage peak rainfall

Excess downstream flow draws from mid-water level and rises through the bypass tube. The bypass sits downstream of the forecourt retention chamber and ACD transfer.

Where it fits

Designed for real sites.

Fuel stations Forecourts & aprons Car parks General site stormwater

Inside HydroStorm

Follow the water.
See the protection.

Explore the actual three-chamber arrangement. Select a condition to see how the front retention chamber and downstream bypass separator work together.

Swipe the illustration to inspect the full unit ↔

HydroStorm operating flow: normal runoff Forecourt runoff enters the front retention chamber. Water enters the low ACD slots, drops down, rises over the transfer and passes into the sediment chamber. The separate side inlet accepts general site runoff. Runoff oil is skimmed down into downstream oil capture. Water passes down through the coalescer, then rises to the outlet. A Forecourt & apron runoffSeparate inlet to front full retention B Car park & general site runoffFull-size inlet through the side RETAINED OIL MID-WATER DRAW → UP BYPASS TUBEHigh-flow overflow · oil and sediment remain captured Mid-water draw ACD FLOAT RAISED · TRANSFER OPENSupported by water beneath the oil OIL DEEPENS · FLOAT DESCENDSSupported by water beneath the oil ACD SEATED · TRANSFER CLOSEDCar-park treatment continues RUNOFF OIL RETAINED DOWNSTREAM Sediment settles Sediment settles Down through filter · up to outlet Outlet 01 Full retention + ACDForecourt spill retention 02 SedimentSide-entry site inlet 03 Bypass + coalescerOil capture + design-flow treatment
Functional flow illustration. Final routes and operating levels follow the approved project drawing.
Forecourt General site Treatment Peak bypass
01

Normal runoff

Forecourt runoff enters the front chamber. Sediment settles and free oil rises. Water enters the low slots in the ACD tube, drops down, then rises over the transfer and through the gap into the sediment chamber. General site runoff enters separately from the side. Small amounts of runoff oil are skimmed through the downcomer into downstream oil capture. Water travels down through the coalescing filter, then rises to the outlet.

Low ACD slots → down → up and over. Down through the filter → up to the outlet.

Inside HydroStorm

Functional flow illustration. Final routes and operating levels follow the approved project drawing.

For designers & specifiers

How to specify
HydroStorm.

Start with the project requirements.
We’ll help you confirm the right configuration.

  1. Two drainage streams

    Provide the forecourt/apron and general site catchments, flows and pollutant risks separately.

  2. Treatment and bypass duty

    Nominate design treatment flow and peak site/bypass flow as separate requirements.

  3. Usable spill storage

    Confirm 6,000, 8,000 or 10,000 L proposed usable storage, closure level and upstream response to ACD closure.

  4. Connections and levels

    Coordinate the forecourt end inlet, full-size site side inlet, outlet, pipe sizes, inverts, head and tailwater.

  5. Installation and access

    Provide groundwater, cover and traffic loads, anchoring, access covers, pump-out and coalescer/ACD service access.

  6. Model-specific confirmation

    Obtain the current model drawing, verified duties and volumes, structural design and applicable performance documentation.

Suggested specification wording

Complete the bracketed project details and confirm the selected model with Protector.

Supply a Protector HydroStorm triple-chamber full retention and bypass separator, model [MODEL], with [TREATMENT FLOW] L/s design treatment duty, [PEAK BYPASS FLOW] L/s project peak bypass duty and [USABLE SPILL VOLUME] L verified usable forecourt spill storage. Provide a front forecourt inlet and automatic closure device, a separate full-size side inlet to the sediment chamber, coalescing treatment and downstream internal bypass. Coordinate pipe sizes, inverts, available head, tailwater, structural conditions and service access with the approved project drawings. Confirm model-specific performance evidence, capacities and manufacturer installation and maintenance requirements before final selection.

Final dimensions, capacities and installation details are established in the approved project drawings and current manufacturer documentation.

Request a project-specific specification

Proposed model range

Match the flow.
Choose the spill capacity.

Four treatment families, with front spill-storage options selected separately. Start with a configuration, then coordinate it with the project hydraulics.

Model family Proposed treatment duty Usable spill storage options
HydroStorm 20 15–20 L/s 6,000 / 8,000 / 10,000 L
HydroStorm 30 30 L/s 6,000 / 8,000 / 10,000 L
HydroStorm 50 50 L/s 6,000 / 8,000 / 10,000 L
HydroStorm 100 100 L/s 6,000 / 8,000 / 10,000 L

Proposed selection range. Treatment duties, usable spill storage, tank dimensions and full-size pipe connections require confirmation on the approved model drawing. Peak bypass capacity is a separate project requirement.

Start a project brief

Your duty.
Your retention.

Choose a proposed family and spill capacity to prepare an enquiry. Final sizing also needs peak flow, available head, inverts and site conditions.

HydroStorm 50 / 10,000 L50 L/s proposed treatment duty. Peak bypass flow and project hydraulics to be confirmed.
Email enquiry

Supporting HydroProtector platform evidence

Independent testing.
A traceable technical basis.

Tested unit: HYD.8.DC.R2-1 / 8 L/s

UniSA’s Australian Flow Management Group tested a full-scale HydroProtector oil-water separator using the reported EN 858-1:2002 procedure. The test used low-sulphur diesel, with five outlet samples analysed by ALS. [1]

The reported result supports the underlying separation technology. It is the starting evidence for the combined HydroStorm design, with its final duty, retention and bypass arrangement confirmed for each model.

Original UniSA oil-water separator test arrangement and outflow capture tanks
Original UniSA test arrangement · Report 21004A, Figure 3.
2.59 mg/L

Mean outlet TRH
Tested HydroProtector unit [1]

4.86 mg/L

Highest outlet TRH
Five samples reported [1]

8 L/s

Test flow
HYD.8.DC.R2-1 [1]

Engineering reviews [2, 3]Issued Henry & Hymas reports address HydroProtector hydraulics, range scaling and petrol-station suitability, subject to site assessment.
Evidence scopeThe cited reports relate to HydroProtector. Whole-unit HydroStorm performance, bypass behaviour, usable spill storage and structure require model-specific confirmation.
Read the report register & test scope

HydroStorm / Technical documentation / Revision F

Technical guide.

Connections, operation, selection and maintenance.

1. System arrangement

HydroStorm combines an upstream full retention and spill-storage chamber with a downstream sediment chamber and coalescing bypass separator in one extended FRP unit. The arrangement adds a front retention section to the bypass separator configuration.

Two drainage streams

Forecourt and apron runoff enters the front chamber through the end inlet. Sediment settles and free oil rises here. An automatic closure device (ACD) controls transfer through low tube slots, down through the base and up over the transfer into the downstream sediment chamber.

Car park and general site runoff enters through a separate, full-size connection in the side of the sediment chamber. The design treatment flow passes through the coalescer, while higher downstream flows use the internal bypass.

Key arrangement: the general site inlet enters the middle chamber from the side. The front full retention section sits upstream of the bypass separator. The bypass is downstream of the forecourt retention and ACD transfer.

2. Connections & interfaces

Coordinate the entire drainage system before manufacture. Pipe diameters and inverts follow the approved project design.

Interface Function Confirm for the project
A · Forecourt inlet End entry to the front full retention chamber Apron catchment, inflow, pipe diameter, inlet invert and upstream storage / surcharge behaviour
ACD-controlled transfer Normal transfer from front chamber to sediment chamber; closes at the nominated spill-storage limit Usable spill storage, closure level, available head, transfer route and inspection access
B · General site inlet Full-size side entry to the sediment chamber Full site peak flow, connection size, invert, approach direction and interaction with downstream levels
Coalescing treatment Oil-water separation at the selected design treatment flow Duty, filter configuration, hydraulic head and service access
Internal bypass & outlet Downstream peak-flow conveyance and final discharge Peak bypass flow, outlet capacity, inverts, tailwater and discharge conditions
3. Operating sequence

01 / Normal runoff

  1. Forecourt runoff enters the front full retention chamber through the end inlet. Sediment settles at the bottom and free oil rises to the surface.
  2. Water enters the small slots near the bottom of the ACD tube, drops down, then rises over the transfer and passes through the gap into the middle sediment chamber.
  3. Car-park and general site runoff enters the middle chamber through its separate, full-size side inlet. Further sediment settles here.
  4. Small amounts of runoff oil rise, skim over and travel down the downcomer into the downstream oil capture chamber, where they are retained.
  5. Water travels down through the coalescing filter, then rises through the outlet path and leaves the unit.

02 / Peak rainfall

The same settlement, oil-skimming and coalescing processes continue. Excess stormwater is drawn from mid-water level, between the floating oil and settled sediment. This water rises through the bypass tube and leaves through the high-flow overflow.

The internal bypass is downstream of the front retention and ACD-controlled transfer. Confirm peak bypass capacity, operating levels and outlet conditions for the project.

03 / Forecourt spill & closure

Spilled oil forms a layer above the water in the front retention chamber. As this layer deepens, the oil–water interface moves down. The ACD ball floats in water, not in oil, and follows that interface down until it seats at the bottom of the tube, closing transfer from the forecourt chamber. Once seated, it remains closed for spill recovery.

The separate car-park and general site inlet continues to feed the downstream separator. Settlement, oil capture and coalescing treatment continue; the internal bypass remains available when downstream flow requires it. The illustration shows this continuing site flow while the forecourt transfer is closed.

Return to service: follow the site incident procedure, recover retained oil and contaminated liquid, inspect the chamber and ACD, and complete the manufacturer’s checks before reopening the system. Address upstream storage and surcharge in the project design and incident plan.

4. Selection & design inputs

Select treatment duty and usable spill storage separately. Nominal tank volume is not the same as verified usable spill storage.

Proposed family Treatment duty Spill options
HydroStorm 20 15–20 L/s 6,000 / 8,000 / 10,000 L
HydroStorm 30 30 L/s 6,000 / 8,000 / 10,000 L
HydroStorm 50 50 L/s 6,000 / 8,000 / 10,000 L
HydroStorm 100 100 L/s 6,000 / 8,000 / 10,000 L

Configuration example: SP.50.TC.R5-2.FR10000 — 50 L/s treatment with a nominated 10,000 L front spill-retention chamber. Final usable volume and model geometry require confirmation.

Provide these inputs

  • Hydraulics: forecourt and site catchment flows, design treatment duty, peak site / bypass flow, inlet and outlet pipe sizes, inverts, available head and tailwater.
  • Spill retention: required usable hydrocarbon storage, ACD closure level, transfer arrangement and upstream response to closure.
  • Site structure: groundwater, burial depth, cover and traffic loads, anchoring and excavation / installation conditions.
  • Access: riser positions, cover ratings, oil and sediment pump-out access, coalescer removal, ACD inspection and monitoring provisions.

Overall length combines the selected bypass separator section with the added front full retention section. Dimensions, connection orientations and operating levels are set by the approved project drawing.

Selection status: model families and spill options are proposed. Confirm final capacities, hydraulic performance, structural design and discharge requirements for the selected HydroStorm model.

5. Inspection, service & recovery

Set maintenance frequency from site conditions, pollutant loading and the manufacturer’s operating instructions. Confirm safe access and servicing arrangements before installation.

Check Purpose
Front chamber Inspect retained oil, sediment and available spill storage. Arrange removal before storage is compromised.
ACD & monitoring Check condition, free movement, closure function and any installed oil monitoring in accordance with manufacturer instructions.
Sediment chamber Inspect and remove accumulated sediment; keep the side inlet and transfer paths clear.
Coalescer Inspect, clean or service the media and associated pipework as instructed.
Bypass & outlet Check for blockage, damage and obstructions affecting high-flow conveyance.
After a spill Implement incident response, recover retained contaminants, inspect the unit and verify ACD operation before return to service.

Keep inspection, pump-out, cleaning, monitoring and incident records as part of the site operating documentation.

6. Testing & evidence register

The following issued reports form the supporting technical basis referenced in Revision F. Full reports may be requested from Protector; source reports and drawings are not appended to the brochure.

[1] UniSA AFMG · Report 21004A

Issued 7 October 2021 · Test conducted 17 September 2021
Tested unit: HYD.8.DC.R2-1 · Flow: 8 L/s · ACD fitted

Full-scale oil-water separation test using the reported EN 858-1:2002 procedure, low-sulphur diesel and an oil challenge of 5 mL per litre of water. After the run-in period, five outlet samples were collected at one-minute intervals.

Outlet sample TRH (mg/L)
1 4.86
2 2.49
3 2.15
4 1.53
5 1.91
Mean 2.59

UniSA concluded that the tested HydroProtector met the Class 1 separation requirements under the stated conditions. The reported Class 1 criteria were a mean below 5 mg/L and no sample above 10 mg/L. All five reported TRH samples were below 5 mg/L.

Source locations: pp. 3, 5–11 and Appendix C. TRH values are used throughout this guide; they should not be confused with the report’s separate TPH results.

[2] Henry & Hymas · 21S30

Hydraulic investigations · Revision 3 · 15 July 2022

Addresses HydroProtector inlet, ACD, baffle, coalescer and outlet losses, retention-time and filter scaling, and available hydraulic head. Supports selection and hydraulic coordination of the reviewed product family.

Source locations: pp. 4, 7 and 11–14.

[3] Henry & Hymas · 22F10

Petrol-station suitability review · Revision 3 · 17 October 2024

Reviews HydroProtector information, test results and fuel-site requirements. Supports the use of HydroProtector for petrol-station applications, with site-specific assessment.

Source locations: pp. 9–10.

Evidence and accreditation scope. These reports relate to the tested HydroProtector and its reviewed family. They support the separation technology and hydraulic design approach. They do not establish whole-unit HydroStorm certification or verification of every proposed HydroStorm duty, bypass flow or 6,000–10,000 L usable spill option.

Report 21004A states that AFMG separator performance testing was outside its NATA-accredited scope. Effluent analysis was undertaken by ALS, a NATA-accredited laboratory.

HS-TC / Revision F / November 2026 · Protector Australia Pty Ltd
Technical enquiries: sales@protector.com.au · 1300 585 787

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