IS 803 Radiographic Weld Acceptance

Spot radiograph frequency and location, weld reinforcement limits, and inclusion/porosity acceptance criteria for shell joints radiographed to justify a joint efficiency of 0.85

◉ IS 803-1976 (REAFFIRMED 2006), §11 · NOT A REGULATORY SUBMISSION TOOL

⚠ Indicative tool only. Source: IS 803-1976, Section 11, read from its own text. This section only applies where a joint efficiency of 0.85 is specified and spot radiography is used to justify it (§11.1) — the same E = 0.85 already used in Tank Protocol's IS 803 shell tool. Table 17 (porosity charts by weld thickness) is shown as reference; the code's own acceptance route for intermediate thicknesses is comparison with the next-thinner material or by calculation (§11.7(d)(5)) — this tool does the calculation route (0.060T mm² per 150 mm) directly rather than interpolating the chart.

Identification

Company

Tank ID

Location

Record Type

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1. Weld Reinforcement Limit (§11.2)

Plate Thickness mm

Measured Reinforcement Height mm

2. Number and Location of Spot Radiographs (§11.3)

Joint Type

Total Completed Joint Length of This Type & Thickness m

Number of Vertical/Horizontal Joint Intersections in the Tank

Plates count as the same thickness when the difference in specified/design thickness is ≤ 0.8 mm (§11.3.1c). At least 25% of selected vertical-joint spots shall be at vertical/horizontal intersections, minimum 2 per tank (§11.3.1a).

3. Inclusion Acceptance (§11.7 a, b, c)

Thickness of Thinner Plate at the Joint, T mm

Any crack, incomplete fusion, or incomplete penetration observed

A single elongated inclusion:

Measured Inclusion Length mm

In-line group of inclusions (§11.7c): sum of the longest dimensions of all imperfections in a line, over a length of 6T (or proportionally less if the radiograph is shorter than 6T), shall not exceed T — unless every individual gap between imperfections exceeds three times the length of the longer adjacent imperfection.

Sum of Inclusion Lengths in the Group mm

Radiograph Length Examined mm

4. Porosity Acceptance (§11.7 d)

Weld Thickness, T mm

Measured Total Porosity Area mm²

Weld Length Examined mm

Largest Individual Pore Dimension mm

This largest pore is isolated (≥ 25 mm from any adjacent pore)

Clustered porosity (§11.7d3): in any 25 mm length or 2T (whichever smaller), porosity may reach 4× the normal concentration — that cluster still counts toward the 150 mm total. Aligned porosity (§11.7d4): sum of pore diameters ≤ T within 12T or 150 mm (whichever less), each pore separated from the largest adjacent pore by ≥ 6× that pore's diameter.

Weld Thickness (mm)	Total Area Permitted (cm²)	Large Pore Size / Count	Medium Pore Size / Count	Fine Pore Size / Count

Table 17, reference only — for weld thicknesses between the rows shown, §11.7(d)(5) permits comparison with the next-thinner material or the calculation above.

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