🔍 Key Concepts

• Vacuum service and what happens to a hose when internal pressure is very low • Construction differences between lightweight, rough bore, and smooth bore cargo hoses • How internal reinforcement (spiral wire, helical coils, etc.) affects resistance to collapse

💭 Think About

• Which type of hose construction is typically strongest against being sucked inward when under vacuum? • Does a hose designed to be light and flexible usually have more or less reinforcement than heavier-duty hose? • Between rough bore and smooth bore hoses, which is more likely to have stronger internal support structures for shape retention?

✅ Before You Answer

• Check which hose type is specifically rated or recommended for vacuum operations in cargo handling references or manufacturers’ data • Confirm which hose typically has heavier wall and stronger reinforcement, even if it is less flexible or more cumbersome • Eliminate any hose type whose main design purpose is flexibility or ease of handling, rather than resistance to collapse