IS 803 Construction, Welding & Testing Checks

Low-temperature material toughness, foundation and shell erection tolerances, platform/stairway design loads, welding preheat and impact rules, and hydrotest/pneumatic test pressures

◉ IS 803-1976 (REAFFIRMED 2006), §4, §7.7, §9, §10, §12 · NOT A REGULATORY SUBMISSION TOOL

⚠ Indicative tool only. Source: IS 803-1976 (Edition 2.1, incorporating Amendment No. 1), reaffirmed 2006, read from its own text. This is the design code Tank Protocol's other IS 803 tools already use (shell, roof, alternate shell, vent, floating roof); this tool covers the sections those don't: materials/toughness (§4), platform and stairway loads (§7.7), erection tolerances (§9), site welding (§10), and test pressures (§12). It does not cover radiographic weld acceptance (§11) — that is a separate, more involved tool given the volume of numeric criteria there. IS 803 itself references older material and welding standards (IS 226, IS 814, IS 823, etc.) by their editions currently in force in 1976; confirm current editions separately.

Identification

Company

Tank ID

Location

Record Type

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1. Low-Temperature Material Toughness (§4.1.3, §4.1.4)

Design Metal Temperature (DMT) °C

Material

Specimen Orientation

Charpy Specimen 1 J

Charpy Specimen 2 J

Charpy Specimen 3 J

§4.1.3: no impact testing required above 10°C. §4.1.4: for −20°C to +10°C, materials other than IS 226 need each plate-as-rolled impact tested at DMT, average of 3 full-size Charpy V-notch ≥ 39 N·m (longitudinal) or 25 N·m (transverse). IS 803 does not state a route below −20°C; this tool flags that rather than guessing one.

2. Foundation Levelness (§9.1.3)

Foundation Type

Measured Deviation, Any 10 m of Circumference mm

Measured Deviation, Total Circumference mm

3. Shell Erection Tolerances (§9.3.5, §9.3.6)

Tank Diameter, D m

Tank Height, H m

Measured Out-of-Plumbness (top rel. to bottom) mm

Measured Radius Deviation (at 300 mm above bottom weld) mm

Measured Peaking, Vertical Joints (1 m arc) mm

Measured Banding, Horizontal Joints (1 m straightedge) mm

Plate Thickness, Vertical Joint mm

Measured Vertical Joint Misalignment mm

Upper Plate Thickness, Horizontal Joint mm

Measured Horizontal Joint Projection mm

4. Floating Roof Erection Tolerances (§9.4)

Tank Diameter, D m

Measured Gap Deviation from Nominal, During Erection mm

Measured Deviation, Roof-Assembly-Centre to Rim mm

5. Platforms, Gangways & Stairways (§7.7)

Element

Provided Width mm

Provided Handrail Height mm

Stairway Angle from Horizontal °

Tread Width mm

Tread Rise mm

Design loads (both platforms and stairways): 4412 N (450 kgf) moving concentrated load on the floor/tread; handrail structure capable of withstanding 882 N (90 kgf) applied at any point, any direction, on the top rail (not a field-measurable check — shown as a reminder).

6. Site Welding – Preheat & Low-Temperature Impact (§10.3, §10.6.7)

Base Metal Temperature at Welding °C

Plate Thickness at Joint mm

Design Metal Temperature (for weld procedure impact test) °C

Weld/HAZ Charpy Specimen 1 J

Weld/HAZ Charpy Specimen 2 J

Weld/HAZ Charpy Specimen 3 J

7. Test Pressures (§12.1, §12.3)

Roof Type

P/V Relief Valve Design Opening Pressure mmH₂O

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