Like many high-rise buildings in Vancouver’s downtown core, the Hyatt Regency Hotel is powered by high pressure steam from the city’s district steam plant.
At the base of the building, two large domestic hot water tanks are used to serve the massive hot water demand from the 644 luxury suites and other amenities.
ClientHyatt Regency Hotel
ContractorTotal Energy Systems Ltd.
Equipment SuppliedQty. of (2) Niles Steel Tank custom hot water generators. 1400 gallon capacity tanks fabricated from passivated 316L stainless steel, ASME rated to 300 psi, with double-walled U-tube heat exchangers for providing 10,000,000 BTU/h of capacity using saturated steam.
When Rodier Mechanical issued a tender for a direct replacement of the existing 304 stainless steel tanks, Raven issued 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 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.
With careful coordination and weekly follow-ups from Raven’s project management, Niles was able to meet the deadline by allocating a second welder to the project, working overtime, and completing the passivation process in only three days. Transporting these large tanks through the tight streets of downtown Vancouver was not an easy feat either, but the project team worked hard together to get it done. Total Energy System’s project manager commented,
[Linna] coordinated my requirements very well. Keep up the good work. 10/10 experience.