Hydraulic Power Systems

Hydraulic and process fluid equipment runs under constant pressure cycling, vibration, and thermal loading, so fabrication tolerances that would be acceptable elsewhere become critical failure points here. A reservoir with an undersized baffle plate lets returning oil short-circuit straight back to the pump suction, starving the system of clean, de-aerated fluid and accelerating cavitation damage. Weld seams on pressurized tanks must be free of porosity and undercut, verified by hydrostatic or pneumatic pressure testing before the vessel ever reaches the customer's floor. Internal surfaces are shot blasted to Sa 2.5 near-white metal cleanliness to remove mill scale and rust that would otherwise contaminate hydraulic fluid and clog servo valves within weeks of commissioning. Every design decision, from reservoir sizing to inlet and return line placement, is governed by ISO 4413 for hydraulic fluid power systems, with NFPA and SAE guidance applied where equipment ships to North American OEMs. Cleanliness requirements can be as demanding as the pressure ratings themselves — particulate contamination invisible to the naked eye is enough to score a proportional valve spool or block a 10-micron filter element.

KREA Makina designs and builds hydraulic and process fabrications around these realities rather than around generic tank-building practice. Reservoirs are engineered with internal baffles and diffusers sized to the pump flow rate, sloped bottoms and low-point drains for complete fluid changeout, and inspection covers positioned for real-world maintenance access. Every pressure-retaining weld is performed by certified welders using qualified procedures, and each vessel is leak-tested — hydrostatically for structural tanks, pneumatically with soap-bubble or dry-air decay testing for lower-pressure enclosures — before final painting. Laser cutting and CNC bending hold the dimensional accuracy that flange faces and mounting interfaces demand, while robotic and manual TIG/MIG welding are matched to material grade and wall thickness. Surface preparation runs through our own shot blasting line to guarantee Sa 2.5 cleanliness ahead of priming and topcoat, and stainless components are pickled and passivated wherever hygienic or corrosion-resistant service is specified.

The result is a product range covering the full hydraulic and process fluid package. KREA fabricates hydraulic oil tanks and reservoirs from 50 liters for compact power packs up to 15,000-liter central systems for heavy industrial presses and mobile equipment fleets, together with complete HPU cabinets and outdoor-rated cabins that house pumps, valves, coolers, and controls in a single weatherproof enclosure. Filter housings are machined and pressure-tested to match system flow and cleanliness targets, pressure and expansion tanks are sized and rated to ISO 4413 and ASME practice for accumulator and thermal-expansion duty, and piping and flanges are fabricated and faced to the same tolerances as the vessels they connect to — so the entire hydraulic circuit, not just the tank, meets one consistent standard of leak-free, contamination-controlled performance.