e) the distribution of scattered porosity exceeds the concentration permitted by Figure 19 or Figure 20.

b) the size of an individual pore exceeds 25 % of the thinner of the specified wall thicknesses joined,

Individual or scattered porosity shall be considered a defect should any of the following conditions exist:

a) the size of an individual pore exceeds 1/8 in. (3 mm),

9.3.9.2 Individual or Scattered Porosity

Porosity is defined as gas trapped by soldifying weld metal befare the gas has a chance to rise to the surface of the molten puddle and escape. Porosity is generally spherical but may be elongated or irregular in shape, such as piping (wormhole) porosity. When the size of the radiographic indication produced by a pore is measured, the maximum dimension of the indication shall apply to the criteria given in 9.3.9.2 through 9.3.9.4.

9.3.9 Porosity 9.3.9.1 General

( b) the width of an ESI indication exceeds 1/16 in. (1.6 mm), e) the aggregate length of ISI indications exceeds two times the thinner of the specified wall thicknesses joined and

the width exceeds one-half the thinner of the specified wall thicknesses joined,

d) the aggregate length of ESI and ISI indications exceeds 8 % of the weld length.

NOTE Parallel ESI indications separated by approximateri the width of the root bead (wagon tracks) shall be considered a single indication unless the width of either of them exceeds /32 in. (0.8 mm). In that event, they shall be considered separate indications.

a) the length of an ESI indication exceeds three times the thinner of the specified wall thicknesses joined,

9.3.8.3 Small Diameter Pipe For pipe with a specified OD less than 2.375 in. (60.3 mm), slag inclusions shall be considered a defect should any of the following conditions exist:

g) the aggregate length of ESI and ISI indications exceeds 8 % of the weld length.

f) more than tour ISI indications with the maximum width of 1/8 in. (3 mm) are present in any continuous 12 in. (300 mm) length of weld,

e) the width of an ISI indication exceeds 1/8 in. (3 mm),

d) the aggregate length of ISI indications in any continuous 12 in. (300 mm) length of weld exceeds 112 in. (13 mm),

e) the width of an ESI indication exceeds 1/16 in. (1.6 mm),

b) the aggregate length of ESI indications in any continuous 12 in. (300 mm) length of weld exceeds 2 in. (50 mm),

( NOTE Parallel ESI indicalions separated by approximately the width of the root bead (wagon tracks) shall be considered a single indication unless the width of either of them exceeds 1/32 in. (0.8 mm). In that event, they shall be considered separate indications.

API STANDARD 1104 38

Liemun CopiapoResaltar

Liemun CopiapoResaltar

Liemun CopiapoResaltar

Liemun CopiapoResaltar