Page 10 of 15
Sewage Purification Plant
Public utilities, such as sewage works, water works, refuse disposal plant etc., are increasingly treated by metal spraying to prolong the safe life of metal structures. One example is the 3.048m (10ft) diameter by 10.668m (35ft) high Silo installed at a sewage purification works.
The protective treatment specified in this instance was grit blast followed by metal spraying with zinc to 100 microns (0.004”) nominal thickness. One coat of etch primer and one coat of zinc chrome primer were then applied and after erection, an undercoat and topcoat pale blue alkyd resin enamel were applied as a decorative finish.
