Grundfos SP 5A-18 Deep-Well Submersible Pump 4"

The Grundfos SP 5A-18 is a 4-inch borehole submersible pump combining 18 stages of pressurisation to deliver 5 m³/h at up to 190 m total dynamic head (TDH), making it one of the most capable groundwater extraction pumps in its diameter class. The SP range is built on Grundfos's sand-resistant AISI 304 stainless steel pressed-steel stage technology, with a close-running clearance between the stage chamber and impeller that maximises efficiency while tolerating the sandy, hard, and brackish groundwater conditions encountered in Saudi Arabia's deep aquifer systems — including the Saq, Tabuk, Wajid, and Dhruma aquifers that underpin Saudi agricultural and municipal water supply in the central, northern, and eastern regions of the Kingdom.

The pump motor is a 4-inch diameter water-lubricated hermetically sealed unit filled with water for heat dissipation, eliminating the need for oil-filled motor designs that risk groundwater contamination in environmentally sensitive water supply boreholes. The SP 5A-18's built-in non-return valve at the pump outlet prevents backflow during start-stop cycles and protects against water hammer — a critical feature in the deep boreholes (200–400 m depth) typical of Saudi Arabia's central agricultural districts where repeated water hammer events can fracture HDPE riser columns. The pump is available with MS402 and MS4000 Grundfos motor protection units that provide dry-running protection, current monitoring, and overload cutout, adding a layer of automation that is increasingly required by Saudi agricultural project operators managing large borehole pump arrays remotely.

In Saudi Arabia's groundwater extraction sector, the Grundfos SP 5A-18 and the broader SP 5A series are extensively used in the agricultural water supply borehole fields operated by Saudi Aramco at Haradh and Al-Qatif — major agricultural water supply programmes supplying irrigation water to alfalfa, vegetable, and date palm farms that form part of Aramco's community development and food security activities. The SP range is also widely specified by Saudi water well drilling contractors serving private farms, municipal water authorities in rural governorates, and industrial facilities in areas not connected to the NWC distribution network. Grundfos's long-established service network in Saudi Arabia, combined with the ready availability of SP motor and pump spare parts through Razz Middle East, makes the SP series the lowest total cost of ownership choice for Saudi groundwater applications.

Razz Middle East maintains stock of the Grundfos SP 5A series including SP 5A-18 units in Riyadh, with same-day availability on the most common configurations. We provide complete borehole pump set supply including pump, motor, riser column, cable, and control panel, and offer full installation advisory services, commissioning, and motor protection relay configuration for agricultural and municipal customers across Saudi Arabia.