The J‑291 family is geometrically similar, allowing the use of the affinity laws to extrapolate performance for other sizes (DN 90‑600).
All curves are supplied in the KSB “Pump Performance Handbook – J‑Series” (Rev 3, 2024) and are available as an Excel spreadsheet for quick sizing. KSBJ-291
| 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) | The J‑291 family is geometrically similar , allowing
Corrosion‑resistant versions (stainless) are recommended for: All curves are supplied in the KSB “Pump
| 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: