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SCHWERLL has won the bid for the large piston accumulator system of Danieli JiuLi Group’s steel extrusion press.
Published Time:
2025-08-12 00:00
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In August 2025, SCHWERLL won the bid to supply a large‑scale piston accumulator system for the Zhejiang Jiuli Special Materials Steel Extrusion Press project, which is being undertaken as a general contract by Italy’s Danieli Steel Group. The system comprises individual 750L piston accumulators and a single 3,200L pressure vessel gas tank. Upon completion, the project will enable hot extrusion forming of ultra‑hard special alloy materials. With installation dimensions approaching 10 meters in height, SCHWERLL is responsible for the complete design, fabrication, on‑site installation guidance, and commissioning of this large‑scale piston accumulator system.
The product specification requirements for the forming-piston energy-storage power‑supply system used in large hot‑steel extrusion presses include:
1. System Safety and Compliance: Large piston-type accumulator systems must comply with the special equipment regulations of the country where they are installed. In China, the applicable special equipment regulations governing operation and installation include:
1) Special equipment manufacturing license for accumulators and large gas pressure vessels;
2) Design drawings bearing the official design seal, issued by a qualified organization, for large accumulators and pressure gas vessels;
3) Supervision and inspection certificates for large accumulators and large pressure gas cylinders;
4) Qualifications for the design and manufacture of high-pressure gas pipelines;
5) Type‑test certificates for large piston accumulators and for seamless‑structure gas cylinders (in accordance with the requirements of TSG 21‑2016, Clause 4.1.2.4).
2. Quality system for preventing foreign objects during the product manufacturing process, as well as large-scale system functional, airtightness, and pressure testing systems:
1) Large-scale accumulator systems are costly to maintain; their construction should be governed by a rigorous quality management system for controlling foreign objects.
2) Quality verification test facilities during the construction of large piston-type accumulator systems, and the test conditions of ultra‑large‑flow test systems;
Leveraging its state-of-the-art hardware production lines and a long-standing, robust quality management system for large-scale cleanroom construction, Schwerll has successfully passed Danieli’s rigorous supplier‑management certification and on-site project evaluation, earning the trust of its customers. This project marks the third major hot‑steel extrusion press–related large‑piston accumulator system that Schwerll has recently won; it follows the Jiangsu Tehé project, which is already in stable, reliable operation, and the Changbao extrusion press project, currently undergoing installation and commissioning.
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What are the causes of severe pressure drop and shortened service life in bladder-type accumulators?
What are the causes of severe pressure drop and short service life in bladder-type accumulators? The structure of a bladder-type accumulator is quite simple, consisting mainly of an oil chamber surrounding the bladder and a gas chamber equipped with a gas‑tight seal. During operation, the hydraulic fluid must be connected to the hydraulic circuit; when the system pressure rises, the fluid flows into the accumulator, compressing the gas until the pressure in the system pipeline stabilizes.
How can we reduce failures when an accumulator malfunctions?
If an accumulator malfunctions, its performance will be directly affected, potentially leading to abnormal pressures and system failure. Therefore, it should receive close attention during routine operation, and appropriate measures must be implemented to mitigate risks. So, how can we minimize failures when an accumulator malfunctions? The following sections address this issue.
Accumulators are intriguing components in hydraulic systems, analogous to capacitors in electrical circuits or springs in mechanical systems. As critical energy‑storage elements, they serve a variety of sophisticated functions, including hybrid‑power applications, shock absorption, pressure stabilization (and sometimes flow‑rate regulation), and the rapid release of stored energy to simulate impacts.
Is a bladder-type accumulator suitable for use in series with gas cylinders or cylinder banks?
1. Bladders typically have a shorter service life than piston‑type accumulators, and their quality varies significantly among different manufacturers. 2. Many factors can shorten a bladder’s lifespan and lead to rupture, including variations in the bladder’s intrinsic quality and durability; improper handling during assembly (e.g., failure to pre‑fill with fluid for lubrication); incorrect procedures during pre‑charging (e.g., insufficiently slow inflation); errors in calculating the pre‑charge pressure; oil‑port flow velocities approaching or exceeding 7 m/s; single‑stroke reciprocation times of 10 seconds or less when used for energy storage; collisions between the bladder and check valves during operation; large temperature fluctuations (including significant seasonal differences); prolonged lateral vibration; fluid‑induced corrosion; and inertial impacts from minute solid contaminants in the working medium, among others.
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