Danfoss 180B3043 APP 1.5 Compact Seawater RO Pump

Danfoss 180B3043 APP 1.5 compact seawater pump

The Danfoss 180B3043 is the APP 1.5, the entry size of the APP 1.5–3.5 group of compact axial piston pumps for seawater and brackish-water reverse osmosis. Its displacement is 9.31 cm³ per revolution, its maximum continuous outlet pressure is 83 bar g, and it weighs only 8.6 kg dry in a duplex stainless steel body with NBR seals. Water is the lubricant, so there is no oil to contaminate the permeate. Seven Star LLC supplies the 180B3043 in Oman and the GCC as an independent supplier in Muscat.

Where the larger APP 5.1–10.2 pumps are designed around 1500 rpm motors, the APP 1.5 is a small, fast pump: its speed range runs from 700 to 3450 rpm, so it pairs naturally with a 2-pole motor or a variable frequency drive. It also carries an integrated flushing valve, a feature the 5.1–10.2 group does not have.

Decoding the 180B3043 identification

180B3043 technical specifications

Why a small APP suits compact RO systems

A 9.31 cm³ pump at 3000 rpm theoretically moves 28 l/min, or about 1.7 m³/h. The datasheet reports 0.79 m³/h at 1500 rpm at maximum pressure, which is 13 l/min against 14 l/min theoretical, a leakage loss of around 6 percent. That behaviour is typical of the axial piston design: output depends on speed and varies little with pressure, so a drive can set flow directly. A single APP 1.5 on a 1500 rpm motor serves a feed flow of under one cubic metre per hour, while at higher speed it can reach two or more times that.

Because the pump is small and light, it can sit on a compact skid or inside a marine or containerised water maker. The G 3/4 connections accept standard high-pressure hose fittings, and the integrated flushing valve lets the user fill and flush the system without a separate bypass line.

Place of 180B3043 in the 1.5 to 3.5 group

The 180B3043 is the smallest of these. Below it, the APP 0.6 to 1.0 pumps (for example 180B3037, the APP 0.8) cover even smaller flows; above it, the APP 5.1 to 10.2 pumps such as 180B3005 take over. All keep the same 83 bar upper pressure rating.

Selection and ordering checklist for APP 1.5

• Feed flow and recovery, calculated at the coldest and warmest water temperature expected.
• Operating pressure up to 83 bar g and the end-of-life membrane pressure margin.
• Fixed-speed or variable-frequency motor, with speed kept within 700 to 3450 rpm.
• Inlet pressure source: 0.5 to 5 bar g, with a booster pump if the intake is a long suction line.
• Standard 180B3043 or ATEX 180B3143.
• Hose or pipe fittings for the G 3/4 connections, and the flange, coupling and bell housing for the chosen motor.

Installation, commissioning and maintenance

Use a bell housing and flexible coupling and keep radial and axial load off the shaft. Fit flexible hoses, an inlet filter with a 10 µm absolute precision depth cartridge, a low-pressure relief valve and an inlet pressure monitoring switch. Because the pump runs at higher speed than larger models, noise and vibration need extra care: use dampers on the frame and avoid rigid pipe connections. The manufacturer expects up to 8000 hours between services when its conditions are met, with an annual inspection and a purpose-designed tool kit. When the pump will stand for more than a day, rotate it for about 10 seconds with permeate; opening the flushing valve alone does not rinse the internals.

Applications in Oman and the GCC for the 180B3043

Small seawater RO units for yachts and workboats in Muscat, remote coastal fishing and tourism sites, offshore platform lifeboat and utility water makers, laboratory-scale pilot plants and brackish-water polishing stages at industrial sites are where a pump this size appears. The ambient limit of 50 °C needs attention in engine rooms and unventilated containers during Omani summers.

Information to send with an RFQ for 180B3043

• Code 180B3043 and quantity, with ATEX requirement if any.
• Duty flow, pressure and the water type and temperature.
• Motor speed and frame, or the drive model that will control the pump.
• Hose and fitting standards for the connections.
• Need for service kits or tool kits.

Site conditions in Oman for the 180B3043

Pump selection in Oman has to account for the site, not only the duty point. Process liquids and cooling water can arrive warm in summer, which raises vapour pressure and reduces the available NPSH, so check the NPSH margin of the 180B3043 at the highest expected liquid temperature. Motors on outdoor skids also work in high ambient air, and their rating, enclosure and cooling should match that environment.

For hygienic and process plants in the Gulf, plan the spare parts that wear first, such as seals, O-rings and bearings, and keep the material certificates with the plant records. Sharing the fluid, temperature, flow, head and cleaning regime with the supplier at RFQ stage makes it easier to confirm that the 180B3043 is the right configuration before the order is placed.

Documents and quotation

The Danfoss APP data sheet covering the 180B3043 is attached on this page.

Send the code number 180B3043 and your system data and we will confirm availability and a quotation for Oman and the GCC.