Phillips 66 Sweeny Turnaround Schedule 2026: Vendor Positioning Guide

Phillips 66 Sweeny is a 265,000 barrel per day refinery located in Old Ocean, Brazoria County, approximately 60 miles southwest of Houston. The facility is notable not just for its refining operations but for its integration with the adjacent Old Ocean fractionation complex, which processes natural gas liquids into ethane, propane, butane, and natural gasoline. Together, the refinery and fractionator create a combined turnaround and maintenance footprint that generates demand across both refining and midstream service categories.

Facility overview

The Sweeny refinery operates crude and vacuum distillation, fluid catalytic cracking, hydrocracking, catalytic reforming, alkylation, and sulfur recovery units. The facility processes a range of crude grades and produces gasoline, diesel, jet fuel, and petrochemical feedstocks. Phillips 66 has invested in reliability and throughput improvements at Sweeny as part of its broader refining portfolio optimization strategy.

The Old Ocean fractionation complex sits adjacent to the refinery and processes NGL streams from multiple pipeline sources. The fractionator separates mixed NGL feed into purity products that supply petrochemical crackers and downstream chemical manufacturers. NGL fractionation involves cryogenic processing, distillation columns operating at high pressures, and specialized metallurgy for cold service applications. Turnaround work on the fractionator requires vendors with NGL and midstream specific expertise, including experience with cryogenic equipment, specialty alloys, and high pressure vessel inspection.

Phillips 66 also holds a 50% interest in Chevron Phillips Chemical Company (CPChem), a joint venture with Chevron that operates ethylene crackers and polyethylene plants at adjacent Gulf Coast facilities. This chemical company relationship creates an extended network of maintenance and procurement activity in the Sweeny and Old Ocean corridor that vendors can pursue alongside refinery turnaround work.

Turnaround scope and timing

Phillips 66 Sweeny operates on a 4 to 5 year major turnaround cycle for primary refining units. The Old Ocean fractionator operates on its own maintenance schedule, which may or may not align with the refinery turnaround calendar depending on unit condition and operational requirements. Phillips 66 discloses aggregate turnaround spending in quarterly earnings calls, providing visibility into system wide maintenance activity levels without specifying individual facilities. Based on cycle timing and disclosed spending, Sweeny falls within expected turnaround windows for the 2026 to 2027 planning period. See the Texas refinery turnaround schedule 2026 for broader context.

A major FCC turnaround at Sweeny generates demand for catalyst handling, cyclone and plenum chamber maintenance, regenerator refractory installation, and slide valve overhaul. The hydrocracker turnaround involves reactor internals inspection, catalyst changeout, and high pressure heat exchanger maintenance. The fractionator turnaround creates demand for cryogenic valve maintenance, column tray and packing replacement, and specialty welding on cold service piping.

Vendor qualification

Phillips 66 requires safety prequalification through ISNetworld for all contractors. The company maintains corporate level approved manufacturer lists for major equipment categories, managed from the Houston headquarters. Site level procurement at Sweeny handles turnaround material requisitions, local service contracts, and MRO purchasing.

The turnaround manager at Sweeny controls the service contractor lineup for planned outage work. Reliability engineers and discipline specific engineers write the equipment specifications that determine approved manufacturers for replacement equipment. For vendors targeting the Old Ocean fractionator, midstream specific qualifications and experience with NGL processing equipment are evaluated in addition to standard refinery vendor requirements.

Phillips 66's engineering standards reflect the company's heritage as the downstream spinoff of ConocoPhillips and incorporate elements from the legacy Conoco and Phillips Petroleum engineering practices. Vendors familiar with the ConocoPhillips or legacy Phillips Petroleum vendor qualification process will find a familiar structure at Sweeny.

For a complete view of all fall 2026 outages across the region, see the Gulf Coast fall 2026 turnaround schedule.