Rain Water Test Rig, waterproofing proven at 1000 LPM.

Introduction & purpose

The Rain Water Test Rig is engineered to reproduce controlled rainfall and spray conditions over aircraft, vehicle and equipment structures. Its two core test phases are qualification testing on the prototype — to validate design efficacy, safety margins, life-cycle performance and reliability against both technical and end-user requirements — and acceptance testing during bulk production, to ensure every unit meets the governing specifications before dispatch, guaranteeing consistent quality and minimizing in-service failures.

Major system components

• Motor-driven centrifugal pump: 11 kW (15 HP), 3-phase AC, 1000 LPM flow, stainless-steel impellers, water media.
• Strainer: 3-inch suction line, water media, ANSI Class-150 flange connection.
• Shutoff (ball) valve: 3-inch size, water media, ANSI Class-150 flange connection.
• Water storage tank: double-layer plastic construction, 10,000-litre capacity.
• Ball valve: 2-inch size, ANSI Class-150 flange connection.
• Water flow meter: 1000 LPM, 3-inch size, Class-B metrological accuracy, ANSI Class-150 flange connection.
• Pressure gauge: 100 mm dial, 0–20 kg/cm² with PSI scale, 1/2″ BSP male thread, in-line mounting.
• Flow-control (globe) valves: 2-inch size, water media, ANSI Class-150 flange connection — multiple units for independent zone control.
• Spray nozzles with spares: anodized-aluminium body with stainless-steel swivel ball, water media.
• Heavy-duty castor wheels for structure mobility.
• Delivery-line strainer: 3-inch size, ANSI Class-150 flange connection.
• Level switch: top-mounted, water media, 50 NB ASA-150# RF line.
• Electrical control panel: ON/OFF switches per motor, MCB protection, adjustable automatic ON/OFF timer controller, overload protection.
• Flexible hoses and GI pipe & fittings (IS-1239 Class B).
• Movable structure: MS with galvanized coating, painted (two coats over a primer coat).

Operating procedure

1. Connect hoses to both structures.
2. Ensure the suction valve is open.
3. Switch on electrical supply (440 V AC).
4. After electrical supply is on, open all valves, then press MOTOR ON.
5. After the motor is on, pressure is displayed on the pressure gauge.
6. Control water flow with the flow-control (globe) valve as required.
7. When the test is complete, switch off the motor via the MOTOR OFF push switch.

Routine maintenance (quarterly basis)

• Motor and pump: check lubrication, packing, alignment and mounting monthly; resolve issues immediately; inspect bearings and motor performance annually.
• Nozzles: if a nozzle jams, open and clean it with pressurized air.
• Strainer: isolate from the pipeline before servicing; remove the strainer cap and screen, clean out sediment/debris; inspect the screen for damage and renew if necessary with a screen of matching material and construction; reassemble with a new gasket, ensuring correct seating.
• Piping: check all joints and bolts are properly tightened; if leakage occurs at a flange, open it and replace the gasket or retighten bolts.

Safety features

• All joints must be fully tightened before operation.
• Do not touch the pump or motor during testing.
• Before starting a test, confirm all nuts and bolts are fully tightened.
• Do not touch any component while the rig is running.
• Do not alter control settings mid-test.

Technical specifications

Applications

• Aerospace certification: validates rain-penetration resistance of fuselage seals, canopies, panel joints and coatings.
• Environmental qualification: tests water-ingress protection of avionics bays, cargo doors and fasteners.
• Maintenance training: simulates rain-light conditions to verify post-repair sealing, drainage paths and water-shed performance.

Conclusion & support

The Rain Water Test Rig delivers a mobile, standards-compliant solution for rigorous rain-exposure and water-ingress testing. Its precision flow circuit, robust MS/GI-coated structure and repeatable operating procedure make it well suited to both prototype qualification and serial acceptance testing across aerospace, defence, automotive and industrial applications. Neometrix Engineering provides full after-sales support, spares and operator training for every rig supplied.