ASME B31.3 Wall thickness Calculator

Project Information

Project Name

Date

Calculation Engineer

Pipe Class

Material Selection

Material Category

Material Grade (Type to search)

Size Selection Mode

Pipe Size

Nominal Pipe Size (NPS)

Outside Diameter (D)

Construction Type

Type of Construction

Weld Joint Factor (E)

Design Conditions

Design Pressure (P)

MPa

Design Temperature

°C

Allowances

Corrosion Allowance

Mechanical Allowance

Manufacturing Tolerance

🔀 Branch Connection Reinforcement Check ASME B31.3 Para. 304.3.3

Check reinforcement adequacy for pipe-to-pipe branch connections using the area replacement method per ASME B31.3 Section 304.3.3. Select header and branch pipes below to create combinations for checking.

Step 1 — Select Pipe Sizes

Click a row to mark it as ◼ Header. Then click another row to pair it as ◼ Branch. Repeat to add more pairs. Branch must be smaller than Header (Db < Dh).

Selected Combinations

Step 2 — Connection Parameters

Branch Angle (β)

Min 45° to Max 90° per code

Select With Pad or Without Pad per combination above. Pad parameters (Tr, OD, stress) are set individually for each combination that uses a pad.

Header (Run) Pipe

Header NPS

NPS

Header OD (Dh)

Ordered Thickness (Th_nom)

Pressure Design Thickness (th)

Branch Pipe

Branch NPS

NPS

Branch OD (Db)

Ordered Thickness (Tb_nom)

Pressure Design Thickness (tb)

ASME B31.3 Wall Thickness Calculator