📐 STEP 1/8: Pipe Geometry
ℹ️ Information: Dimensions conform to ASME B36.10M (welded and seamless steel pipe).
Schedule defines wall thickness for a given DN.
🌡️ STEP 2/8: Service Conditions
📋 ASME B31.1 Rule:
• Pdesign = max(Pservice + 1 bar, Pservice × 1.10)
• Tdesign = Tservice + 15°C (if T ≥ 0°C)
• Tdesign = max(Tservice - 10°C, -29°C) (if T < 0°C)
• Pdesign = max(Pservice + 1 bar, Pservice × 1.10)
• Tdesign = Tservice + 15°C (if T ≥ 0°C)
• Tdesign = max(Tservice - 10°C, -29°C) (if T < 0°C)
🧪 STEP 3/8: ASME Material Selection
⚙️ STEP 4/8: ASME B31.1 Parameters
📌 Important Notes:
• S : Allowable stress based on T and material (ASME Table A-1)
• E : Weld joint efficiency (0.80 to 1.0 depending on method)
• W : High temperature reduction factor (1.0 if T ≤ 510°C)
• y : Temperature coefficient (0.4 to 0.7 depending on T and steel type)
• A : Allowance for corrosion/erosion/threading
• S : Allowable stress based on T and material (ASME Table A-1)
• E : Weld joint efficiency (0.80 to 1.0 depending on method)
• W : High temperature reduction factor (1.0 if T ≤ 510°C)
• y : Temperature coefficient (0.4 to 0.7 depending on T and steel type)
• A : Allowance for corrosion/erosion/threading
📐 STEP 5/8: ASME B31.1 Formula Equation (7)
ASME B31.1-2022 Section 104.1.2(a) - Straight Pipes under Internal Pressure
tm = (P × Do) / [2(SE + Py)] + A
Note: This formula applies when e < Do/6 et P < 0.385 SE
Nomenclature:
• tm : Minimum required thickness (mm)
• P : Internal design pressure (MPa)
• Do : Outside diameter (mm)
• S : Material allowable stress (MPa)
• E : Weld joint efficiency
• y : Temperature coefficient (Table 104.1.2-1)
• A : Additional allowance (mm)
• tm : Minimum required thickness (mm)
• P : Internal design pressure (MPa)
• Do : Outside diameter (mm)
• S : Material allowable stress (MPa)
• E : Weld joint efficiency
• y : Temperature coefficient (Table 104.1.2-1)
• A : Additional allowance (mm)
✅ ÉTAPE 6/8 : Résultats de Calcul
Minimum calculated thickness tm
— mm
Thickness with tolerance 12.5%
— mm
Available thickness (Schedule)
— mm
Safety margin
— %
Schedule Number calculé
—
Recommended Schedule
—
📋 ÉTAPE 7/8 : Détails des Calculs (Step by Step)
🔧 ÉTAPE 8/8 : Hydrostatic Test Pressure (Section 137.4.5)
📏 Test Pressure Calculation
Ptest = 1.5 × Pdesign
✓ Procédure ASME B31.1 Section 137.4:
• Maintenir Ptest pendant minimum 10 minutes
• Réduire à Pdesign pour inspection des joints
• Examiner tous joints et connexions
• Aucune fuite visible (sauf presse-étoupe pompes/vannes)
• Test fluid: clean water (minimize corrosion)
• Maintenir Ptest pendant minimum 10 minutes
• Réduire à Pdesign pour inspection des joints
• Examiner tous joints et connexions
• Aucune fuite visible (sauf presse-étoupe pompes/vannes)
• Test fluid: clean water (minimize corrosion)
📊 TABLEAU 104.1.2-1 - Coefficient y selon Temperature et Matériau
| Type de Matériau | Temperature de Calcul | |||||||
|---|---|---|---|---|---|---|---|---|
| ≤482°C (900°F) |
510°C (950°F) |
538°C (1000°F) |
566°C (1050°F) |
593°C (1100°F) |
621°C (1150°F) |
649°C (1200°F) |
≥677°C (1250°F) |
|
| Aciers ferritiques (Carbon & Alloy Steel) |
0.4 | 0.5 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 |
| Aciers austénitiques (Stainless Steel 304, 316, etc.) |
0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.7 | 0.7 | 0.7 |
| Alliage nickel UNS N06690 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.7 | 0.7 | — |
| Alliages nickel (N06617, N08800, N08810, N08825) |
0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.7 |
| Fonte (Cast Iron) | 0.0 | — | — | — | — | — | — | — |
⚠️ NOTE SPÉCIALE: Pour Do/tm < 6, utiliser la formule:
y = d / (d + Do) pour aciers ferritiques et austénitiques à T ≤ 482°C.
📊 Facteur W - Réduction Résistance Soudure (Para. 102.4.7)
| Temperature | T ≤ 510°C | 566°C | 621°C | 677°C | 732°C | 788°C | ≥815°C |
|---|---|---|---|---|---|---|---|
| Aciers ferritiques | 1.0 | 0.93 | 0.85 | 0.78 | 0.70 | 0.62 | 0.5 |
| Aciers austénitiques | 1.0 | 0.96 | 0.92 | 0.84 | 0.76 | 0.63 | 0.5 |
ℹ️ Information: Le facteur W tient compte de la réduction de résistance des welds
à haute température (domaine du fluage). Interpolation linéaire autorisée.