Measuring the Length of a Hydraulic Hose
The measurement and specification of the length of a crimped hydraulic hose is an important prerequisite to an efficient hydraulic system.
Why is it so important to know how to correctly measure the length of a hydraulic hose?
Knowing the correct hydraulic hose length is an important step in building a safe and efficient hydraulic system. If you’ve ever wondered “which hose do I need?”, the answer depends on factors like pressure, media, temperature, and routing, but getting the length right is critical to ensuring proper fit and performance.
Even small mistakes in hose sizing can lead to serious issues, from poor performance to equipment damage or even injury to operators or those nearby.
Measuring the Length of a Crimped Hose Assembly
Generally speaking, the overall length of a hydraulic hose assembly is measured to the sealing surface of straight fittings or to the centerline of elbow fittings.
When assembling a hose or ordering a hose assembly for your manufacturing line, it is important to know the overall length. (This shouldn’t be confused with hose cut length, which is measured based on other factors with the end connections.)
Due to space restrictions in many hydraulic applications, overall length can be critical. For example, it helps determine whether there is adequate clearance for surrounding components in your equipment. It also ensures the hose will properly fit within compartments or under engines, and reach its intended connection points under normal operating conditions.
Important Notes to Consider When Measuring for Crimped Assemblies
- Hose length can and will change under pressure.
- Ensure there is enough length so hose fittings are not subjected to pull-off forces at maximum travel.
- Do not stretch hoses, as this can restrict the flow of fluids and cause internal damage to the hose.
- Do not clamp high and low pressure hoses together.
- Consider the system’s motion, potential vibration, and hose routing when measured.
Specific Criteria for Measuring Crimped Hoses
Length Over Nipples
Male threaded ends are measured from the end of the threads. Female ORFS ends are typically measured from the sealing surface while female JIC, DIN, and NPSM ends are typically measured to the end of the hex.
Length Between Center Line of Angle and Banjo
Angled ends are measured from the center of their sealing surface.
Length Between Male Nipple and Center of Elbow Fitting
Male ends are measured from the end of the fittings and elbows are measured from the centerline.
Length Between Male Nipple and Center of Angle
Final Thoughts
Getting the hydraulic hose length right isn’t just a technical detail, it’s essential to the safety, performance, and longevity of your system.
If you’re unsure which hose you need, the answer starts with understanding your application, followed by measuring the hose assembly correctly. Getting the length right is one of the simplest ways to prevent costly issues down the line.