{"product_id":"calpeda-4sdp-3-21-w-stainless-steel-4-inch-submersible-bore-pump-residential-tank-filling","title":"Calpeda 4SDP 3\/21-W Stainless Steel 4\" Submersible Bore Pump for Residential Tank Filling with Floating Impellers","description":"\u003cp\u003eHigh-lift groundwater recovery for residential utilities and fire protection is the primary application for this submersible pump from deep 4-inch well installations. It processes clean water with suspended sand up to 150 g\/m³ and supports continuous service for high-pressure distribution networks.\u003c\/p\u003e\u003cp\u003eA 1.5 kW motor on a 415V supply drives the 21-stage assembly, achieving a peak head of 135 meters and a maximum flow of 70 L\/Min. The motor coupling conforms to NEMA standards, providing a standardised mechanical interface for simplified field serviceability.\u003c\/p\u003e\u003cp\u003eWithin each stage, LEXAN floating impellers can move axially to accommodate sand particles, helping to protect the polycarbonate diffusers from excessive wear. This design supports consistent operation throughout the unit's service life in deep-well environments.\u003c\/p\u003e\u003cp\u003eAISI 304 stainless steel forms the external jacket, with a delivery casing incorporating a built-in non-return valve to shield the hydraulic assembly from water column weight and back-pressure during shutdown. Rated for water up to 35°C, the assembly includes a chrome-nickel steel suction filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFEATURES\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLEXAN radial floating impellers are designed to handle sand particles while preventing internal wear and seizure\u003c\/li\u003e\n\u003cli\u003eReinforced polycarbonate diffusers reduce turbulence and improve system energy efficiency\u003c\/li\u003e\n\u003cli\u003eTwenty-one-stage hydraulic configuration delivers 135 meters of head for deep-well recovery and fire fighting\u003c\/li\u003e\n\u003cli\u003eAISI 304 stainless steel external jacket provides resistance to subterranean oxidation and borehole stress\u003c\/li\u003e\n\u003cli\u003eBuilt-in non-return valve protects the internal hydraulics from backflow and reverse rotation stress\u003c\/li\u003e\n\u003cli\u003eNEMA-standard coupling simplifies installation and ensures compatibility with various submersible borehole motors\u003c\/li\u003e\n\u003cli\u003eChrome-nickel steel suction lantern with robust filter blocks mineral particulates from the stages\u003c\/li\u003e\n\u003cli\u003eClass F insulation and IP68 protection support continuous duty in deep, fully submerged boreholes\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Calpeda","offers":[{"title":"Default Title","offer_id":50983321895159,"sku":"4SDP 3\/21-W","price":1237.01,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0927\/0116\/3767\/files\/calpeda-4sdp-3-21-w-stainless-steel-4-inch-submersible-bore-pump-residential-tank-filling.png?v=1785325823","url":"https:\/\/foundationpumps.com.au\/products\/calpeda-4sdp-3-21-w-stainless-steel-4-inch-submersible-bore-pump-residential-tank-filling","provider":"Foundation Pumps","version":"1.0","type":"link"}