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Riveted boiler joints: thickness of unequal double-cover butt straps For unequal-width double-cover butt straps on a plate of thickness t: Identify the standard strap thicknesses (inside wide strap vs. outside narrow strap). Choose the correct option.

Difficulty: Easy

Correct Answer: 0.75 t for the wide strap (inside) and 0.625 t for the narrow strap (outside)

Explanation:

Concept
For unequal double-cover butt joints (as used in boiler work), a common rule is:
• Inside/wide strap thickness = 0.75 t• Outside/narrow strap thickness = 0.625 twhere t is the main plate thickness.


Final Answer
0.75 t (inside wide) and 0.625 t (outside narrow)

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