Sacrificial flush

A so-called sacrificial flush is a solution containing cheap surfactant substitutes (e.g. lignosulphonates) likely to adsorb on the rock surface. Such a slug could be injected to prevent or reduce the adsorption from the surfactant slug, thus reducing losses (and cost) and formulation alterations. It also prepares the reservoir fluids to reach the optimal formulation in an easier and faster way. 

Figure 10.17 shows various arrangements for fixing saerifieial anodes on tubular struetures. Submarine pipelines are usually proteeted by bracelet anodes encompassing the pipe and flush wifli the outer concrete coating. Sacrificial anodes on ship hulls are commoidy flush-mounted and welded directly to the hull. 

An HPLC precolumn is used as a sacrificial column when harsh/reactive mobile phases are used. The packing material should match the identity of the analytical column but can be made from much less expensive large-particle material (30-40 tm). The column is dry packed and flushed with mobile phase to remove air before attaching to the system. 

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