End Suction (ANSI)
| Identification | |
| Manufacturer | Flowserve |
| Series | Mark 3 |
| Model / size | 4x6-13 |
| Pump type | End Suction (ANSI) |
| Spec code | PS-ES-041 |
| Duty & power | |
| Min flow | 50 m³/hr |
| Max flow | 300 m³/hr |
| Min head | 20 m |
| Max head | 120 m |
| Max power | 110 kW |
| NPSHr | 6.7 m |
| Efficiency at BEP | 75 % |
| Drive & electrical | |
| Starting method | VFD or Auto-Transformer (recommended for controlled acceleration) |
| VFD compatible | Yes (10-60 Hz) |
| Motor IE class | IE3 (mandatory EU/MEPS) / IE4 optional |
| Insulation class | Class F (155°C) |
| IP rating | IP55 |
| Materials & sealing | |
| Casing | Cast Iron |
| Impeller | Bronze |
| Shaft | SS 316 |
| Seal type | Mechanical Seal |
| API seal plan | Plan 11 (standard) + Plan 62 (quench steam) optional |
| Application | |
| Service | Potable Water, Large Flow |
| Key features | ANSI B73.1, largest Mark 3 size |
A complete, shareable page for a single pump. It plots the performance curve (head, efficiency and NPSHr against flow, with the best-efficiency point marked, or dosing flow against stroke), decodes the API 682 / ISO 21049 mechanical seal plan, and lists the full specification — duty and operating range, drive and motor, materials of construction, build and reliability, connections, weight and certifications. Pop-up panels give the type-specific preventive-maintenance schedule (daily to annual tasks with procedures) and a troubleshooting guide (symptoms, probable causes and recommended solutions).
Run a centrifugal pump near its BEP and keep dosing pumps in their recommended stroke band. Data is from the engineering reference database — confirm against the manufacturer's certified curve before procurement.
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