Pneu-Hyd Industries | Manufacturer of Hydraulic Cylinders

Double Acting Welded Hydraulic Cylinder for the Marine Lift Industry

Double Acting Welded Hydraulic Cylinder
Double Acting Welded Hydraulic Cylinder

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Challenge: Utilizing alternative measures to create a rust proof cylinder for a marine environment.

Pneu-Hyd Industries was commissioned by a customer in the marine industry to design a rugged custom welded hydraulic cylinder able to withstand the demands of the harsh marine environment. This cylinder would mount to a crane positioned on the deck of a ship to lift buoys from the water, and the customer needed a no rust solution. The traditional chrome plated rod we normally provide would not be sufficient; so a special nickel plated rod with a .001" chrome layer was determined to be the best solution over other alternatives. It would offer a superior corrosion resistance to the saltwater environment. The cylinder was constructed from various types of steel, employing CNC machining, saw cutting, and certified welding methods. 

The finished cylinder had a long, 58.00” stroke; a 5.50” bore size, and a 2.500” rod featuring a chrome overlay and 100K tensile strength. The closed length of the cylinder was 76.00”, and there was one trunnion mount on the barrel and welded tangs to the blank end and the rod end with a 2.75" pin. Special attachments included multiple port locations for various plumbing configurations, four 3/4 - 16 O-ring boss ports. Operating pressure was 1700 psi, and the unit was completely tested at intervals throughout fabrication as well as after completion to assure quality and accuracy. Turnaround time for this project was 5 weeks, completed to customer specification. For more information about this welded marine application hydraulic cylinder or our other large bore specialty use cylinder manufacturing capabilities please see the table below or contact us directly.

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Double Acting Welded Hydraulic Cylinder - Project Highlights

Product Description
Double Acting Welded Hydraulic Cylinder.
Capabilities Applied/Processes
Engineering Design
Saw Cutting
CNC Machining & VMC Machining
Chrome Plating - Thickness: 0.001"
Induction Hardening
Product Specifications
Bore Size - 5.50" Bore
Stroke - 58.00" Stroke
Rod - 2.500" nickel plated rod with 100K Tensile Strength, 0.001" chrome overlay
Closed Length - 76.00"
Ports - Four 3/4 - 16 O-ring boss ports
Mounts - one trunnion mount on barrel of cylinder
Mounts - Rod End - Welded tangs to the blank end and the rod end with a 2.75" pin.
Operating Pressure - 1700 PSI
Additional Facts
Special Attachments - Multiple port locations for various plumbing configurations.
Material Used
Various types of steel
In process testing/inspection performed
In process testing at work stations and a final inspection report upon completion
Industry for Use
Marine Crane
Delivery/Turnaround Time
5 weeks from the receipt of approval drawing
Delivery Location
Standards Met
Customer Specifications, 2D CAD Drawing Approved
Product Name
Marine Application Cylinders

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