TSG relies on recurring revenue streams from operation and maintenance contracts for the bulk of its business. Margins are thin, the contracts are long-term, locations are remote – and the range of issues that can erode project profitability is daunting. However, TSG is a specialist in coastal and island installations. The company’s principals have decades of experience with the highly corrosive conditions and uneven-but-expensive energy supplies that characterize the Caribbean. And they have shaped their business accordingly.

According to Chip Harris, vice president and general manager, “We’re relentless in pursuing the lowest possible life cycle costs, and we always take the long view in balancing capital versus operational costs. Power is extremely expensive in most of the markets we serve, and because plant locations are so remote, simple maintenance routines are a must. When you take full responsibility for a plant’s operations over the course of 20 years – and that means everything except supplying electricity – total cost of ownership considerations are simply baked into everything you do.”

TSG’s design philosophy is a direct result of its business model: They engineer plants of the highest quality and energy efficiency possible. Their commitment to QA (quality assurance) and QC (quality control) is unrelenting. Their designs must not only be more robust than their competitors’ – they must also save more energy.

“I guess I’m a little old school when it comes to quality,” explains Harris. “I’ve just spent too much time in the field to put up with quality-cost compromises that don’t make sense. And in contracts where energy costs mean more to your bottom line than capital costs over a plant’s lifetime, going for anything but the best can mean the difference between profit and loss. That’s why Danfoss APP pumps and VFDs have been standard components for several years now.”

Over the last two years TSG has built and operated six new SWRO plants with Danfoss APP pumps and VFDs, ranging from 20,000 to 250,000 GPD permeate flow. Field failures? Zero.

“Danfoss APP pumps have just got bigger and better,” says Harris. “They have so many advantages over reciprocating positive displacement pumps – not least robustness, design and maintenance simplicity, and energy efficiency – that they are our pump of choice. We’re particularly happy to see the range grow in capacity, as this means we can include them in larger designs.”

“In the same way, Danfoss AQUA VFDs are simply exceptional. We use them for both high- and low-pressure pumps in our desalination facilities, and for air blower systems and EQ pumps in our wastewater facilities. They’re robustly reliable, and this is key in our region where brownouts are almost as common as voltage and frequency variations.”

“That we can get both of these key components from the same supplier is only an advantage. When we need service, which is rare, responsiveness is excellent. For us, Danfoss is in the “solution” column – not the “problem” column.”

VLT® AQUA Drive FC 202