The RTD Series is the largest pump family AR makes: 21 to 52.8 GPM, on a 35 mm solid shaft, turning at 1,000 RPM with a 110 oz crankcase.

A thousand RPM is slow even by industrial standards, and it is the single most important number here. At this size and load, speed is what would destroy the pump, so the design gives it up in exchange for years of service.

The RTD Series range

The spread is from 42 to 69 HP at the shaft, so with margin you are specifying 50 to 75 HP motors or a hydraulic circuit with equivalent capacity. That is a serious electrical installation and it should be settled before anything else.

Specialist RTD pumps

• RTD100-200SX, left-hand shaft for mirrored installations
• RTDSS80-300N, food-grade 420 stainless head at 21 GPM / 4,350 PSI
• RTD-HW80-300H, hot water rated at the same output
• RTD-I-80.300N-DD and RTD130-200HNB-DD, direct-drive hydraulic versions
• HYD-RTD80-300HN-DD and HYD-RTD130-200HNB-DD, complete hydraulic motor packages

The stainless and hot water versions are worth knowing about, because they cover the two conditions that kill a standard head at this size: sanitizer chemistry and temperature.

Two ends of the same RTD pump range

The RTD80-300 at 21 GPM and 4,350 PSI and the RTD200-100 at 52.8 GPM and 1,450 PSI need almost the same shaft power, and they do completely different work.

4,350 PSI removes coating and scale. 52.8 GPM moves water across a surface faster than anything else in the catalog. Deciding which you need is the whole selection process; the models in between are compromises between the two.

How RTD pumps are built

• Brass or nickel-plated brass head, with a stainless option on the SS models
• Bronze connecting rods, for the torque that comes with low-speed operation
• Oversized pistons and valves, sized for the volume
• 110 oz oil capacity, SAE30
• 35 mm solid shaft
• 1,000 RPM, 800 on the L160

Feeding an RTD pump

A 52.8 GPM pump needs 52.8 GPM delivered, continuously, at positive inlet pressure. That is a serious supply system, not a plumbing afterthought: a tank above the pump, a short full-bore feed line sized well above the inlet port, and full-flow valves.

Cavitation at this scale is not a noise, it is a rebuild. And rebuilds on an RTD are not cheap.

Where RTD pumps are used

• Hydro-demolition and concrete cutting
• Mining and quarrying: heavy-duty cleaning and processing
• Steel production and foundries: furnace cleaning, slag removal, descaling
• Oil and gas: rig sanitation, hydrostatic testing, wellhead cleaning
• Municipal: bridge and dam maintenance, graffiti, wastewater treatment
• Shipyards and marine: hull cleaning, barnacle removal, dock sanitation
• Power generation: boiler tube cleaning, cooling towers, turbine support
• Food processing, with the stainless head version

Servicing RTD pumps

Rebuildable, with valve kits, piston kits in Ø32, Ø36 and Ø40, matching water seals and piston guides, oil seals, hot water seal sets, inlet and outlet plug kits, rail kits and grease fittings. Kits are sized by plunger diameter, so identify your model before ordering.

Oil is SAE30 non-detergent, AR645107. At 110 oz you need roughly one container per change with some left over.

At this size the maintenance schedule is the entire ownership case. Oil on interval, seals replaced before failure, inlet filtered and monitored. Done properly these run for many thousands of hours.

Browse the RTD series, or send your flow, pressure, water supply and available power and you will get a model the whole installation can support.