S9074-AR-GIB-010/278
Footnotes to table XVII
ASTM E 272 and E 186 reference radiographs (films) shall be applied as specified. Reference films in ASTM E 272 are identified by tk thickness ranges: (a) up to 2 inches and (b) 2 to 6 inches. Film are shown for the various discontinuity types in both thickness ranges. Three types of shrinkage are shown. designated (a) Feathery. (b) Spongy and (c) Linear. Only feathery type is shown in the up to 2-inch thickness range. and spongy and linear types are shown in the 2-inch to 6-inch thickness range. Films from both thickness ranges have been used without regard to applicable thickness specified herein in order to provide the best coverage and gradation of discontinuities. Since film identification designations are duplicated in the two thickness ranges. they are further identified in the table by stating the source. Where 'X-Ray' appears under source in the table. this indicates that the 'Low Voltage X-Ray Film' is applicable. Where 'gamma' appears under source in the table, this indicates that the '2 MEV X- Ray or Cobalt-60 Gamma Ray Film' is applicable. Reference films specified shall be used for all production radiography sources. 1.
TABLE XX. RT acceatance criteria for tin-bronze castlna~.
Severity level
Criticality level
ASTM E 186 (EXCEPT AS NOTED)
ASTM E 310
Shrinkage
Inclusions
Chaplets
Porosity
Thickness Level
Level Definitions
Reference Radiograph
Reference Radiograph
Reference Radiograph
Reference Radiograph
ASTM Standard
Type
Areas requirng 75 percent and > RT coverage (see 12.5.3) Areas requiring 50 percent min. RT coverage ( see 12.5.3)
Linear
Ca 2
1
B1
None acceptable
A 2
Feathery or Spongy
Ca 1
1/2 Inch and less
Linear
Ca 3
None acceptable
2
2/ B3
A 3
Feathery or Spongy
Cd 2
Areas not requring RT but inadvertenly radiographed or radiographed for information purposes
Ca 4
Linear
3
A 4
B2. 2/ B4
E 186
EA 3
Feathery or Spongy
Cd 3
Linear
Ca 3
Same as level 1 as defined above
2/ B3
None acceptable
A 3
1
Feathery or Spongy
Cd 3
Over 1/2 inch
Ca 4
Linear
Same as level 1 as defined above
A 4
B2 2/ B4
2
E 186
EA 3
Feathery or Spongy
Cd 3
Linear
Same as level 2 as defined above
Ca 5
EA 4
A 5
B5
E 186
3
Feathery or Spongy
Cd 4
Original 117
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