 |
Reg. 49 C
MATERIALS OF CONSTRUCTION
SEAMLESS
FERRITIC
AND AUSTENITIC ALLOY STEEL BOILER, SUPERHEATER AND HEAT
EXCHANGER TUBES
Expanding or Flaring Test |
A
section of the tube approximately 100 mm in length shall stand being
flared with a tool having a 60 degree included angle until the tube
at the mouth of the flare has been expanded to the percentages given
below, without cracking.
|
Ratio
of inside diameter to outside diameter
|
Minimum
expansion of inside diameter %
|
|
0.9
|
21
|
|
0.8
|
22
|
|
0.7
|
25
|
|
0.6
|
30
|
|
0.5
|
39
|
|
0.4
|
51
|
|
0.3
|
68
|
|
