Hydraulic Cylinders: A Buying Guide for Facility Managers

Executive buying summary

Hydraulic cylinders are essential components in a wide range of industrial and heavy machinery, providing linear motion for tasks such as lifting, pressing, and pushing. Selecting the right cylinder requires careful consideration of its operating environment, load capacity, and required precision. Total cost of ownership is influenced by factors such as cylinder durability, maintenance requirements, and the availability of spare parts. A significant risk to avoid is selecting a cylinder that is not appropriately sized or rated for its intended application, potentially leading to premature failure and downtime.

• Hydraulic cylinder performance is directly linked to the cleanliness of the hydraulic fluid, so fluid quality management is paramount.
• Compliance with PUWER 1998 and LOLER 1998 is essential to ensure safe operation and prevent accidents.
• Manufacturer traceability and adherence to BS EN ISO 9001 demonstrate a commitment to quality and reliability.
• Consider the mounting dimensions as defined by ISO 6022 to ensure seamless integration with existing machinery.
• Regular inspection and maintenance programmes are vital for extending cylinder lifespan and preventing unexpected failures.

Equipment types compared

Key features to look for

• Cylinder Bore Material & Surface Finish: The material and finish affect cylinder life and efficiency; enquire about the hardness and surface treatment applied.
• Rod Seal Material: The seal prevents leakage and protects the rod; confirm compatibility with the hydraulic fluid and operating temperature.
• Cylinder Mounting Options: Different mounting configurations (e.g., fixed, pivoting, trunnion) affect installation flexibility; verify suitability for the application.
• Operating Pressure Rating: Ensure the cylinder's pressure rating exceeds the system’s maximum pressure to prevent failure; request pressure test certification.
• Stroke Length Accuracy: Precision is crucial for many applications; request data sheets detailing accuracy tolerances.
• Cylinder Cushioning: Cushioning reduces shock and extends cylinder life, particularly in applications with frequent reversals; determine if cushioning is required and the type offered.
• Environmental Protection Rating: The cylinder’s ability to withstand dust, moisture, and other contaminants is important; check the IP rating.
• Manufacturer’s Traceability Documentation: Full traceability of materials and manufacturing processes demonstrates quality control and facilitates fault diagnosis.

Pros and cons of each equipment type

Single Acting Cylinder

Pros: Simpler design, typically lower upfront cost, easier maintenance.

Cons: Limited functionality (extension only), relies on external force for retraction, less precise control.

Double Acting Cylinder

Pros: Bidirectional movement, greater control, more versatile applications.

Cons: More complex design, potentially higher upfront cost, more components requiring maintenance.

Telescopic Cylinder

Pros: Provides long strokes in a compact package, suitable for applications requiring extended reach.

Cons: More complex construction, potentially lower efficiency, higher susceptibility to contamination.

Hydraulic Shock Absorber Cylinder

Pros: Dampens shock and vibration, protects machinery and reduces noise.

Cons: Can introduce additional complexity, may require more frequent maintenance.

Stainless Steel Cylinder

Pros: Corrosion resistance, suitable for harsh environments, hygienic applications.

Cons: Higher material cost, potentially lower strength compared to carbon steel.

Which facilities each type suits

• Single Acting Cylinder: Waste management facilities, simple pressing operations, basic lifting applications.
• Double Acting Cylinder: Manufacturing plants, material handling equipment, automated machinery.
• Telescopic Cylinder: Construction sites, agricultural equipment, mobile cranes.
• Hydraulic Shock Absorber Cylinder: Presses, stamping machines, applications with high impact forces.
• Stainless Steel Cylinder: Food processing plants, pharmaceutical facilities, cleanrooms.

Buyer's checklist

1. Confirm site space and access dimensions to accommodate the cylinder and its installation.
2. Verify compliance with PUWER 1998 and LOLER 1998 requirements for lifting equipment.
3. Review the cylinder’s operating manual and safety data sheets.
4. Establish a fluid cleanliness management programme in accordance with ISO 4406.
5. Arrange for qualified personnel to install and commission the cylinder.
6. Develop a preventative maintenance schedule, including regular inspections and seal replacements.
7. Ensure adequate training is provided to operators and maintenance staff.
8. Secure a service agreement with a reputable supplier for ongoing support and repairs.
9. Stock essential spare parts, such as seals and hoses, to minimise downtime.
10. Consider the cylinder’s expected lifespan and plan for eventual replacement.