Thin-wall vessel stress API

Computes hoop, longitudinal and von-Mises stress for a thin-walled cylinder, flags the D/t validity limit and inverts to the required wall thickness for an allowable stress. Answers 'What is the hoop stress in my pressure pipe?', 'How thick must the wall be?'.

Price$0.04per request

MethodPOST

Route/v1/engineering/thin-wall-vessel

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

pressure-vesselhoop-stressthin-wallcylinderlongitudinal-stresswall-thicknessvon-misesmachine-design

API URLhttps://x402.hexl.dev/v1/engineering/thin-wall-vessel

Integration docs

Example request

{
  "internalPressureMpa": 2,
  "innerDiameterM": 1,
  "wallThicknessM": 0.01,
  "allowableStressMpa": 150
}

Example response

{
  "hoopStressMpa": 100,
  "longitudinalStressMpa": 50,
  "vonMisesStressMpa": 86.6025,
  "diameterToThicknessRatio": 100,
  "thinWallValid": true,
  "formula": "σθ = p·D/(2t), σz = p·D/(4t)",
  "interpretation": "Thin-wall theory applies; hoop stress is twice the longitudinal — circumferential seams govern.",
  "requiredWallThicknessM": 0.00666667,
  "factorOfSafety": 1.5
}

Input schema

{
  "type": "object",
  "required": [
    "internalPressureMpa",
    "innerDiameterM",
    "wallThicknessM"
  ],
  "properties": {
    "internalPressureMpa": {
      "type": "number",
      "examples": [
        2
      ]
    },
    "innerDiameterM": {
      "type": "number",
      "examples": [
        1
      ]
    },
    "wallThicknessM": {
      "type": "number",
      "examples": [
        0.01
      ]
    },
    "allowableStressMpa": {
      "type": "number",
      "examples": [
        150
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}