Haxx Engineering designs and supplies tank fittings and components for aboveground storage tanks at oil, gas, and chemical terminals worldwide. The Swedish company specialises in the engineering of tank accessories — including roof fittings, shell nozzles, venting systems, and structural components — that are installed on fixed-roof and floating-roof storage tanks built to API 650 and equivalent international standards. Haxx Engineering products are specified by terminal operators, EPC contractors, and tank fabricators across Europe and international markets.
Haxx Engineering: Company Overview
Haxx Engineering is headquartered in Sweden and has established a position in the tank fittings and components segment serving the European and international aboveground storage tank market. The company’s product focus addresses the ancillary hardware category — the fittings, nozzles, hatches, vents, and structural accessories that complete a storage tank installation beyond the shell and floor fabrication itself.
Tank fittings represent a relatively small proportion of overall tank construction cost but carry disproportionate operational significance. A poorly specified or low-quality fitting can introduce fugitive emission pathways, create inspection access constraints, or cause structural integrity issues that compromise tank service life. Haxx Engineering’s engineering focus on this component category positions the company as a specialist rather than a general tank equipment supplier.
Tank Fittings and Components Product Range
Haxx Engineering’s product range covers the full spectrum of aboveground storage tank fittings required across the construction, commissioning, and operational lifecycle of a terminal tank. Core product categories include roof fittings for fixed and floating roof tanks, shell manways and nozzles for product inlet and outlet connections, venting and pressure relief components, and structural accessories including stairways, platforms, and walkway systems.
Roof fittings for floating roof tanks include roof drain systems, seal support components, rolling ladder guides, and roof manways — all designed to accommodate the vertical movement of the floating roof as tank inventory fluctuates. The engineering tolerances and materials specification for these components directly affect the performance of the primary and secondary rim seals, which are the critical vapour emission control barrier on floating roof tanks.
Shell nozzles and manways are specified to API 650 dimensional standards and are fabricated in carbon steel, stainless steel, and alloy grades depending on the product service and corrosion requirements of the stored fluid. Haxx Engineering’s nozzle configurations cover flush-type, insert-type, and reinforced pad designs across the range of pipe sizes and pressure ratings encountered in terminal tank applications.
Venting Systems and Emission Control Fittings
Venting and pressure relief fittings are among the most regulatory-sensitive components on a storage tank. Haxx Engineering’s venting product range includes pressure-vacuum relief valves (PVRVs), open vents, and flame arrestor assemblies that protect tanks from over-pressure and vacuum conditions during filling, emptying, and thermal breathing cycles while meeting the emission control requirements of applicable standards.
Correctly specified venting is mandatory under API 2000 — the industry standard governing venting of atmospheric and low-pressure storage tanks — and is subject to inspection under tank integrity programmes conducted in accordance with API 653. Haxx Engineering components designed to these standards give terminal operators and their inspection contractors the documentation and dimensional traceability required for compliance records.
The tank fittings segment feeds directly into the broader equipment and components market covered in the Top 10 Tank Equipment Manufacturers 2026 ranking, which maps the full range of hardware suppliers serving the aboveground storage tank sector globally.
Market Position and Competitive Landscape
Haxx Engineering operates in a segment that includes established tank component and valve suppliers such as Fort Vale Engineering — the UK-based tank valve and loading system specialist — and OPW Engineered Systems, whose product range spans fluid transfer, loading arms, and tank accessories. The tank fittings segment is characterised by long qualification cycles at major operator and EPC contractor level, where approved vendor lists govern specification decisions and new suppliers face significant lead times to establish the track record required for approval.
Haxx Engineering’s Swedish base positions the company within the European tank construction and terminal maintenance market, where proximity to the North Sea terminal and refinery base, Scandinavian petrochemical facilities, and the active Baltic and Rotterdam terminal markets provides a natural home territory for sales and technical support activity.
EPC Contractor and Terminal Operator Specification
Tank fittings and components are specified at two distinct stages of the terminal asset lifecycle. At the construction phase, EPC contractors select and procure fittings to match the tank design, product service, and owner-supplied specifications — a process in which Haxx Engineering competes on technical compliance, dimensional accuracy, material certification, and delivery performance. At the maintenance and inspection phase, terminal operators source replacement fittings and components to restore tanks to their original specification or to upgrade components where the original design has been superseded.
Both procurement pathways require manufacturers to maintain comprehensive dimensional documentation, material traceability certificates, and third-party inspection records — a documentation standard that differentiates established specialist suppliers from generic hardware sources. Haxx Engineering’s engineering focus on the tank fittings category supports the documentation depth that major operator and EPC contractor qualification processes require.
Company Snapshot
| Headquarters | Sweden |
|---|---|
| Core Products | Tank fittings, shell nozzles, roof fittings, venting systems, tank accessories |
| Applications | Fixed-roof tanks, floating-roof tanks, aboveground storage terminals, refineries |
| Key Standards | API 650, API 653, API 2000, EN equivalent standards |
| Market Coverage | Europe (primary), international |
| Sector | Equipment & Components — Tank Fittings & Components |
What does Haxx Engineering specialise in?
Haxx Engineering specialises in tank fittings and components for aboveground storage tanks at oil, gas, and chemical terminals. The company’s product range covers roof fittings, shell nozzles and manways, venting and pressure relief systems, and structural accessories for fixed-roof and floating-roof tanks built to API 650 and equivalent international standards.
Where is Haxx Engineering based and where does it supply?
Haxx Engineering is headquartered in Sweden and primarily serves the European aboveground storage tank market, including North Sea terminal and refinery operators, Scandinavian petrochemical facilities, and the broader Baltic and Northwest European terminal sector. The company also supplies international markets through EPC contractor and terminal operator procurement channels.
What tank standards apply to Haxx Engineering products?
Haxx Engineering tank fittings and components are designed and manufactured to API 650 (welded tanks for oil storage), API 653 (tank inspection, repair, alteration and reconstruction), and API 2000 (venting of atmospheric and low-pressure storage tanks). European equivalent standards including EN 14015 apply in markets where European normative requirements govern tank design and construction.
How are tank fittings specified for a new terminal construction project?
During new tank construction, EPC contractors select fittings to match the tank design, product service conditions, and owner specifications. Suppliers must provide full dimensional documentation, material traceability certificates, and third-party inspection records to satisfy approved vendor list requirements. Haxx Engineering’s specialist focus on the tank fittings category supports the documentation standards required at this procurement stage.
What is the role of venting fittings on a storage tank?
Pressure-vacuum relief valves, open vents, and flame arrestor assemblies protect storage tanks from over-pressure and vacuum conditions that occur during product filling, emptying, and thermal breathing cycles. Correctly specified venting prevents tank structural damage, controls vapour emissions to comply with environmental regulations, and is subject to inspection under API 653 tank integrity programmes. API 2000 is the governing standard for storage tank venting design.