What is the minimum bursting strength for hydraulic hose, tubing, and fittings relative to maximum operating pressure?

• A. 2x
• B. 4x
• C. 3x
• D. 5x

Answer: (C)

The main idea is that hydraulic hose, tubing, and fittings must have a safety margin well above the normal operating pressure to handle spikes and aging without failing. The standard intended here specifies that the bursting strength should be at least three times the maximum operating pressure. This three-to-one margin helps absorb pressure surges, pump transients, and other real-world factors that can push the system momentarily above its steady operating level, reducing the risk of rupture.

Two times the operating pressure would be insufficient to cover those spikes, increasing the chance of a dangerous failure. Four or five times the operating pressure can be more conservative than necessary for this context and may add unnecessary weight or cost, so the three-to-one margin is the chosen balance for this situation.