On the Suitability of Vibration Acceptance Criteria of Process Pipework

Table 6

Classification of cases and the number of cases in each category (3-sigma results, 99.73% confidence).

Category	Description	Number of cases
OO	OK vibration, OK stress	676
OC	OK vibration, CONCERN stress	109
OP	OK vibration, PROBLEM stress	91
CO	CONCERN vibration, OK stress	178
CC	CONCERN vibration, CONCERN stress	50
CP	CONCERN vibration, PROBLEM stress	169
PO	PROBLEM vibration, OK stress	1
PC	PROBLEM vibration, CONCERN stress	23
PP	PROBLEM vibration, PROBLEM stress	303
Total		1600