ONSHORE FLUSHING RIGS
Flowplant onshore flushing rigs are suitable for high pressure flushing umbilicals, pipework and components. Flushing flow comes from the Harben® P type or Century radial diaphragm pump, capable of operating up to 700 bar and flows of 150 l/min. Cleanliness standards of ISO 4406 15/14/12 (NAS 1638 Class 6), or better are achievable.
Harben radial diaphragm pumps can handle flushing fluids that cause problems for other direct acting pumps. The Harben design keeps all moving parts away from the pumped fluid. It is also a seal-less design and it doesn’t rely on the pumped fluid for cooling or lubrication.
Rigs can be driven by a fixed speed motor with flow control achieved using pressure and flow control valves. Alternatively, where fine flow control is required, variable frequency drives can be fitted. These have the advantage of reducing waste energy and the amount of heat transferred to the flushing fluid.
Dynamic pressure monitoring can be incorporated ensuring flushing pressure doesn’t exceed pre-set limits. Additionally this can be combined with automatic pressure regulation enabling test routines to be followed and documented.
We will work with you to calculate the Reynolds number, fluid temperature, flow and back pressure of your application. When all parameters have been determined, we will propose the best solution from our standard range of flushing rigs. If you have specific requirements such as space constraints or hazardous atmospheres our engineers will provide a bespoke solution with GA drawings and P&ID’s.