Ksbj-291

| Item | Description | |------|-------------| | Product family | KSB J‑Series (single‑stage, end‑suction, close‑coupled centrifugal pumps) | | Model | J‑291 | | Design purpose | General‑purpose liquid handling for water, light oils, and non‑corrosive chemicals in HVAC, municipal, industrial and agricultural applications. | | Typical ratings | 0.5 – 250 m³ h⁻¹ (≈ 130 – 66 000 gpm) at heads up to 90 m (≈ 300 ft). | | Drive options | Direct‑coupled to a standard 3‑phase motor (up to 355 kW) or optional belt‑drive configuration. | | Certifications | ISO 9001, ISO 14001, ATEX‑II 3G (explosion‑proof version), CE‑marked, ANSI/ASME B73.1 compliance. | | Key selling points | • Compact, low‑profile design (≤ 1.2 m overall height)
• High‑efficiency hydraulic profile (up to 85 % at BEP)
• Easy access for maintenance (removable volute/impeller)
• Wide range of impeller‑diameter (D = 290 mm nominal)
• Robust cast‑iron or stainless‑steel (AISI 304/316) construction. |

The J‑291 is the “work‑horse” of KSB’s J‑Series, often chosen when a reliable, low‑maintenance pump is needed in a relatively confined installation space. It is especially popular in:

| Feature | Detail | |---------|--------| | Impeller | Closed, backward‑curved (BC) design; detachable, balanced, and reversible.  Material: high‑strength cast iron (DIN 1699) or stainless steel (AISI 304/316). | | Volute | Split‑case volute with removable cover for easy inspection.  Material matches impeller (cast iron or stainless). | | Shaft | Hardened steel, key‑less (splined) connection to motor hub;  C3 tolerance class for high‑speed service. | | Bearings | Double‑row angular contact ball bearings, lubricated for life (sealed). Optional ceramic hybrid for high‑temperature service. | | Mechanical seal | Dual‑seal arrangement (single‑seal option available). Materials: carbon‑silicon carbide (C‑SiC) or ceramic‑ceramic; optional oil‑free seal for sanitary applications. | | Casing | Rigid, bolted split‑case (16‑bolt pattern).  Standard pressure rating: PN 10 (≈ 1 bar) – can be ordered up to PN 16 with reinforced flange. | | Suction & discharge |  DN 90 (3‑inch) up to DN 600 (24‑inch) flanges; ANSI‑B16.5 or EN‑1092‑1. Optional threaded or welded connections. | | Base & mounting | Rigid footplate with integrated vibration isolation pads (optional).  Can be mounted on a skid, concrete pad, or directly on a machine frame. | | Drive coupling | Rigid (direct) coupling with key‑less spline hub; optional flexible coupling for misalignment compensation (up to 0.5 mm). | | Cooling | Pump body serves as the primary heat sink; optional external water jacket for high‑temperature fluids. |

| Parameter | Value | |-----------|-------| | Overall length (center‑to‑center) | 1 080 mm | | Overall width (including flange) | 780 mm | | Overall height (incl. motor) | 1 150 mm (motor‑mounted) | | Impeller diameter (D) | 291 mm | | Shaft length (motor to bearing) | 340 mm | | Weight (dry, cast‑iron) | ≈ 210 kg | | Weight (dry, stainless) | ≈ 185 kg |

Note – Exact dimensions vary with nominal flow class (DN 90‑600). All dimensions are given in millimetres (mm) unless otherwise noted.

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    | Component | Standard Material | Optional Materials | |-----------|-------------------|---------------------| | Casing & volute | Cast iron (DIN 1699) | Stainless steel AISI 304, 316 (corrosive media) | | Impeller | Cast iron (DIN 1699) | Stainless steel AISI 304/316, bronze (high‑temperature) | | Shaft | Hardened carbon steel (C45) | Duplex stainless (for aggressive environments) | | Mechanical seal | Carbon‑silicon carbide (C‑SiC) | Ceramic‑ceramic, PTFE‑graphite (food‑grade) | | Bearing housing | Cast iron | Stainless steel (for sanitary) | | Gasket | Spiral wound (graphite) | PTFE, metal‑to‑metal (high‑temperature) | | Item | Description | |------|-------------| | Product

    Corrosion‑resistant versions (stainless) are recommended for: