Ligaments
See UG-42(e): When a series of two or more openings in a cylindrical or conical shell are arranged in
a regular pattern, reinforcement of the openings may be provided per the rules of ligaments in UG53.
Interpretation:
VIII-1-83-94
Subject:Section VIII, Division 1; UG-42, Reinforcement of Multiple Openings
Date Issued:
March 3, 1983
File:
BC82-784
Question:
When there are multiple openings in a shell or header and each has sufficient
reinforcement by calculation, within the reinforcement limits, to satisfy individual reinforcement
requirements of Section VIII, Division 1, can each opening therefore be considered a single opening and
not require calculation using the ligament efficiency factor?
Reply:
Yes, see UG-42.