Читать книгу Flow-Induced Vibration Handbook for Nuclear and Process Equipment - Группа авторов - Страница 59

The tube‐to‐support clearance must be small enough to provide an effective support. Thus, pinned support conditions may be assumed provided the tube‐to‐support diametral clearance for drilled holes, broached holes, scallop bars, egg crates and lattice bars is less than or equal to 0.4 mm.

For flat‐bar‐type U‐bend supports, the vibration analysis should satisfy Section 2.7.2 for the out‐of‐plane direction while assuming that one (any one) support may not be effective in the U‐bend region. In the in‐plane direction, the diametral clearance between tube and flat bar support should be sufficiently small to provide effective support (e.g., <0.1 mm).