Hyatt Regency

When Rodier Mechanical issued a tender for a direct replacement of the existing 304 stainless steel tanks, Raven offered an alternative proposal to Total Energy Systems to have the tanks fabricated by Niles, except using passivated 316L stainless steel rather than type 304. It is well known that type 316L offers considerably higher resistance to oxygen corrosion, chlorides, and acidic water – all of which are common issues with domestic water in Vancouver. Passivation is a surface modification that involves immersing the entire tank in a heated acid bath, which creates a protective oxide layer on the metal surfaces and welds, further increasing the tank’s durability and longevity. Even with the price premium of 316L and passivation, Raven was able to match the price of the specified type 304 non-passivated tanks, while also offering a much longer warranty.

The contractor was facing a very tight project schedule that required Raven to make special arrangements with the manufacturer, Niles Steel Tank, in order to ensure that the equipment would arrive on site before the scheduled downtime. In addition, both the tanks and the tube bundle heat exchangers required new CRNs (Canadian Registration Numbers) which Raven obtains through Technical Safety BC.