I am designing an upfit that requires seismic. The concrete deck above is at about 21'-0" while the new ceiling is at 8'-0". The ceiling is being built with structural steel, but the ceiling panels are being installed directly under the steel. The only way to install a branch line restraint is to hang the line high enough to be able to achieve a >45° angle. This may end up requiring a lateral brace assembly if the l/r is greater than 400. So I'm wondering if I can use a restraint from the structural steel below the pipe, installed at 45° up from the ceiling. If it is within 6" of the vertical hanger arranged for restraint against upward movement, and the l/r does not exceed 400, then would that be acceptable per 9.3.6.1(5) (2016) or 18.6.1(5) (2019)?
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