Our firm has been designing block foundations for combustion gas turbine and steam turbines (either pile supported or on-grade) for a settlement tolerance of 1/4". However most soils reports I see arrive at allowable bearing pressure recommendations based on 1/2" of overall settlement. I'm wondering though whether the machine tolerance being used at our firm is overly stringent, as I'm not able to locate the basis to support it in our company materials. Does anyone in this forum have experience in the settlement tolerances required for CTG and STG machines?
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