🔍 Key Concepts

• Flexible hose under pressure tends to change length and move slightly • Hoses should not be installed pulled tight in a straight line between rigid connections • Internal reinforcement (wire braid) can cause twisting and kinking near one end when the hose is pressurized

💭 Think About

• Look at hose B: what will happen to a perfectly straight, tight hose when internal pressure increases and it tries to shorten or move? • If one end is more free to move than the other, which end is more likely to distort and restrict flow? • Compare B with C and D: why are C and D better able to absorb movement without creating a sharp kink right at a fitting?

✅ Before You Answer

• Identify which end of hose B appears more constrained by the attached piping and which end could bend or buckle • Decide whether the restriction would form upstream (ahead of flow) or downstream (trailing the flow) of the moving fluid • Mentally ‘pressurize’ the hose: imagine it trying to expand and shorten—where does the first sharp bend or kink logically appear?