Cold tightening torque of the turbine retaining ring and inner cylinder split-face bolts
Thread Content
The retaining rings of the turbine and the bolts on the split surface of the inner cylinder only need to be tightened cold, but the manufacturer has not provided any torque requirements; it is necessary to look up these values on one’s own. What standards and specifications can be referred to? First, thank you all, experts! ! !
The content is a bit complex; please have an expert provide an answer
Since the manufacturer hasn’t provided it, we need to ask them; after all, it has to be regulated in accordance with the manufacturer’s production and design standards. It is necessary to take the actual situation into account; even if there are standards, they may not necessarily apply!
There is a set of calculation methods for the pre-tightening force of the cylinder split face. The calculation of this pre-tightening force depends on the material of the bolts, the thickness of the split-face flanges, and the design temperature of the turbine stage in the vertical plane where the bolts are located. The pre-tightening force varies for bolts in different stages; even if they are positioned close to each other, knowing how to calculate it isn’t sufficient as an owner or third party – it is recommended to obtain the necessary information from the turbine manufacturer.