Clamp systems and methods of using the same with steam dryers
Clamp systems include multiple, separate clamps joinable to components subject to relative rotation. Clamps may have similarly-positioned features to simplify installation and/or removal about a small area for all clamps in the system. Each clamp cannot freely rotate relative to an adjacent clamp but does not pass vertical loads to an adjacent clamp. Clamps may use mating shapes like an extension and recess to limit rotation. Clamps fit to the perimeters of components to which they individually secure by biasing against the components. At least one clamp has a transitional surface to provide space between the clamp and component to provide containment to a weld or other joining structure. Clamp systems can be tightened by included fasteners. Crimp nuts or other locking structures can preserve the biased and secured nature of the clamps and underlying structures. Clamp systems may be used to secure or repair a lifting rod assembly.
1. A method of repairing a steam dryer lifting rod assembly extending in a longest dimension along a vertical axis and having a lifting lug connected to a lifting rod and including a weld on an outside of and joining the lifting lug and the lifting rod, the method comprising:
tightening a first clamp around the lifting lug so as to be fixed on the lifting lug;
tightening a second clamp around the lifting rod so as to be fixed on the lifting rod, wherein the tightenings position the first clamp into the second clamp to block the first and second clamps and underlying lifting lug and lifting rod from rotating more than 2 degrees relative to one another in either direction on the vertical axis, wherein the first and second clamps are clamshell clamps having round inner perimeters, wherein the second clamp includes a transitional surface shaped to contain and not directly contact the weld, and wherein the tightening the second clamp positions the second clamp to cover the weld so that pieces of the weld are limited from breaking off and exiting the second clamp.
2. The method of claim 1 , wherein the tightenings position a gap between the second clamp and the first clamp so the second clamp does not directly touch the first clamp.
3. The method of claim 1 , wherein the round inner perimeter of the first clamp matches the outer perimeter of the lifting lug, and wherein the round inner perimeter of the second clamp is smaller than the inner perimeter of the first clamp and matches an outer perimeter of the lifting rod.
4. The method of claim 1 , wherein the tightening the second clamp around the lifting rod further positions a top surface of the second clamp in direct contact with a bottom surface of the lifting lug, positions an inner perimeter of the second clamp in direct contact with an outer perimeter of the lifting rod, and does not put the first clamp and the second clamp in direct contact.
5. The method of claim 1 , wherein the tightening the first clamp includes tightening a bolt in the first clamp, wherein the bolt is moveable relative to the first clamp and cannot be removed from the first clamp.
6. The method of claim 5 , wherein the tightening the first clamp further includes rotating a crimp nut on the bolt, the method further comprising:
locking the first clamp by deforming the crimp nut against the bolt.
7. The method of claim 1 , wherein the first clamp includes a tab extending vertically downward from a bottom of the first clamp, and wherein the second clamp includes a recess extending vertically downward from a top of the second clamp, and wherein the recess is larger than the tab so as to allow the tab to move within the recess.
8. The method of claim 7 , wherein the tightenings position the tab into the recess without directly contacting the first clamp to the second clamp to block the first and second clamps and underlying lifting lug and lifting rod from rotating more than 2 degrees relative to one another in either direction on the vertical axis.
9. The method of claim 1 , wherein the first clamp includes a primary hinge and a bolt configured to tighten the first clamp, wherein the bolt is a swing bolt pivotable on a secondary hinge in the first clamp and cannot be removed from the first clamp.
10. The method of claim 9 , wherein the bolt includes a threaded surface and a corresponding crimp nut on the threaded surface, the method further comprising:
locking the first clamp, after the tightening the first clamp, by deforming the crimp nut onto the bolt.
11. The method of claim 9 , wherein the first clamp includes a tab extending vertically downward from a bottom of the first clamp, and wherein the second clamp includes a primary hinge and a bolt, wherein the second clamp includes a recess extending vertically downward from a top of the second clamp, and wherein the tightenings position the tab into the recess and simultaneously positions the primary hinges and bolts of the first clamp and the second clamp at same position vertically adjacent to one another on the lifting rod assembly.
12. A method of repairing a steam dryer lifting rod assembly extending in a longest dimension along a vertical axis and having a lifting lug connected to a lifting rod and having a weld on an outside of and joining the lifting lug and the lifting rod, the method comprising:
tightening a first clamp around the lifting lug so as to be fixed on the lifting lug; and
tightening a second clamp around the lifting rod so as to be fixed on the lifting rod, wherein the tightenings position one of the first clamp and the second clamp into the other of the first clamp and the second clamp to block the first clamp and underlying lifting lug from unlimited rotation in either direction on the vertical axis relative to the second clamp and underlying lifting rod, wherein the first and second clamps are clamshell clamps having round inner perimeters, wherein the second clamp includes a transitional surface shaped to contain and not directly contact the weld, wherein the round inner perimeter of the first clamp matches an outer perimeter of the lifting lug, and wherein the round inner perimeter of the second clamp is smaller than the inner perimeter of the first clamp and matches an outer perimeter of the lifting rod.