Page 568 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

The Post-Shipment Phase: Installation, Pre-Commissioning, Commissioning and Start-up Best Practices Best Practice 1 0.6

Fig 10.6.20 Shaft alignment e preliminary
considerations

Fig 10.6.21 Shaft alignment e alignment change
limits when connecting piping

Why? It is costly, exposes the plant to possible safety
1
I Confirm excessive pipe stress (refer to Figure 10.6.24). Also problems and can result in a process unit shutdown. Usually,
confirm pipe bolting can be removed without a ‘come along’ it should be planned for a T&I. I have found that the
II Walk piping system and confirm proper installation per piping guidelines in Figure 10.6.24 provide the best probability of
isometrics implementation.
Proper pipe support shims
Spring supports free to move
No obvious pipe misalignment
III Correct excessive pipe stress by: 2
Attempting rebolting at the next flange 1. Float pipe to machine. Machine is not a pipe support
Using ‘Dutchman’ with flexitallic gaskets (each side) 2. Lock pins on spring or pipe supports adjacent to machinery
Heating of pipe for alignment kept in place until system filled
Pipe modification at next T&I 3. Flanges parallel on machined surfaces and no come alongs!
1
Notes: Work permits required (Bolts can be removed without excessive force)
2 All items in III must be confirmed correct per Box 10.6.23. 4. Flange faces within 0.0010"

Fig 10.6.22 Suggested excess pipe stress solution procedure Fig 10.6.23 Pipe considerations

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