Why International Seaways leans on its Scrubber Investment Program for cleaner tonnage

Reviewed: ad hoc news Software & Services desk. Edited and checked on 2026-06-18, 22:58. Details in the imprint.

With the Scrubber Investment Program, International Seaways turns a very physical product - ocean-going tankers - into something surprisingly digital and data-driven on the fuel side. Every cleaned exhaust plume and sulfur graph tells management whether the multi-million-dollar bet is paying off.

What the scrubber program does

At its core, the Scrubber Investment Program equips selected crude and product tankers with exhaust gas cleaning systems that strip sulfur oxides from emissions so the ships can keep burning cheaper high-sulfur fuel oil while still complying with IMO 2020 rules. According to company presentations, International Seaways has installed or committed scrubbers on a portion of its VLCC and Suezmax fleet, focusing on vessels with longer remaining economic lives and heavy spot-market exposure.

Technically, the installed scrubbers are closed or hybrid loop systems mounted in the funnel, with sensors feeding back real-time data on exhaust composition, pressure, and washwater quality to the bridge and shore-based operations teams. The installation package typically includes new piping, pumps, and control software that is integrated into the ship's automation systems for continuous monitoring.

Why International Seaways invests here

The economic logic is straightforward but unforgiving: the spread between very low sulfur fuel oil and high sulfur fuel oil has to stay wide enough, for long enough, to pay back the scrubber capex and off-hire days the installation requires. International Seaways has repeatedly highlighted the scrubber-fitted vessels as a lever to enhance time-charter equivalent earnings in strong rate environments where fuel savings are captured by owners rather than charterers.

Strategically, the Scrubber Investment Program also acts as a hedge on regulation and fuel availability, giving the company flexibility to operate globally without depending on every port having the right grade of compliant fuel available at a reasonable price. In investor materials, the company frames the scrubber decision as part of a broader “fuel flexibility and environmental compliance” strategy rather than a short-term arbitrage.

How it feels on board and in operations

For crews, a scrubber-equipped tanker feels subtly different: there is more machinery humming in the funnel, more parameters on the engine control room screens, and more checklists when switching between fuel grades or operating modes. Engineers must track washwater pH, turbidity, and flow rates alongside classic metrics like cylinder lubrication and exhaust temperature.

On the bridge, captains and chief engineers receive alarms and trend graphs rather than just a binary “on/off” signal, which makes the system both powerful and occasionally demanding when operating in coastal emission control areas with strict local rules. Onshore, performance dashboards aggregate scrubber data against bunker purchase prices and voyage earnings, turning every voyage into a small test of the original investment case.

Where the limits and risks lie

The Scrubber Investment Program is not a free lunch, and International Seaways is open about the trade-offs: installation can take several weeks in dry dock, during which the vessel earns nothing and the company faces schedule risk if yard slots slip. There is also technical risk: poorly tuned scrubbers can cause backpressure on engines, potential corrosion issues, and additional maintenance burden if not managed carefully.

Regulatory risk is the big unknown over the longer term, as some ports and coastal states have restricted open-loop scrubber discharge and could tighten rules further, which would undermine part of the economic advantage that underpins the investments. In that scenario, the value of the program would hinge more on fuel flexibility and less on pure fuel-cost savings.

How investors should see it in context

Within International Seaways' overall fleet strategy, the Scrubber Investment Program sits next to newbuilding orders, secondhand purchases, and vessel sales as one more capital-allocation lever the management team pulls to balance risk, compliance, and potential upside in volatile tanker markets. The company has emphasized maintaining a relatively young, efficient fleet while still sweating existing assets hard when spot markets reward it.

Shares of International Seaways (MHY410381037) trade in New York on the NYSE in US dollars, giving global investors direct exposure to tanker earnings and to management's scrubber and fleet-modernization decisions as part of the investment story.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.