Table 1.

Number of production tests monitored by acoustic emission [5]. (Total up to 7.1.79; numbers in brackets 7.1.78-7.1.79 only.)

	Shop hydrotest	Pre-service (installed)	In-service (requalification)	On-line monitoring*
Chemical/petroleum vessels†	32 [5]	4 [0]	382 [88]	12 [4]
Chemical/petroleum systems	-	3 [0]	50 [0]	3 [2]
Chemical/petroleum components and piping†	1548 [812]	34 [28]	57 [25]	14 [8]
Nuclear reactor vessels†	24 [1]	4 [0]	5 [2]	4 [0]
Nuclear power plant systems	-	22 [0]	9 [0]	-
Nuclear components and piping	8 [0]	22 [1]	1037 [26]	99 [64]
Nonnuclear power plant components	2 [0]	-	5 [2]	17 [16]
FRP vessels†	595 [135]	47 [14]	75 [70]	12 [12]
FRP components and piping	23 [23]	303 [300]	12 [12]	-
Storage tanks	46 [1]	29 [6]	68 [14]	1 [0]
Cell liners	-	-	12 [0]	4 [0]
Rocket cases (missiles, etc.)	208 [2]	-	-	-
Autoclaves	2 [0]	1 [0]	33 [18]	11 [3]
Misc. pressure vessels†	17 [11]	2 [0]	107 [30]	-
Misc. components	2860 [360]	4 [3]	240 [240]	230 [34]
Structures (bridges, cranes, etc.)	-	14 [12]	85 [14]	4 [1]
Heat exchanger tubing (ft)	231,000	-	500 [500]	-
Liquid and gas pipelines (ft)	58 [5]	1000 [0]	517,000 [46,000]	2002 [2000]
Drill pipe (ft)	961,000 [961,000]

^*On-line surveillance of operating systems or components.

^†Excludes experimental vessels.

^‡Tested separately from a system test.