API Reference for Developers & AI Agents

Option 1: Bearer Token (Login)

POST /auth/login
Content-Type: application/json

{"email": "user@example.com", "password": "secret"}

Response: {"access_token": "eyJ...", "user": {...}}

Then use: Authorization: Bearer eyJ... on all subsequent requests.

Option 2: API Key (Direct)

Use header: X-API-Key: pc_your_api_key_here

API keys are shown in the user profile after login.

Calculate cylindrical shell under internal pressure. Returns utilization ratio, required thickness, and allowable pressure.

Example

GET /api/excel/cylinder?standard=EN13445&Do=1200&t=20&P=25&T=300&material=P265GH

{
  "utilization": 0.663,
  "e_required_mm": 13.25,
  "p_allowable_bar": 37.51,
  "status": "PASS"
}

Dished head calculation (torispherical, ellipsoidal, hemispherical).

Tube bend check per EN 12952-3 Anhang A. Returns Bi/Bo factors, intrados/extrados stresses, and P_allow.

GET /api/excel/tube_bend?Do=38&t=3.2&bend_radius=45&P=56.5&T=294&material=P235GH

{
  "Bi": 1.365, "Bo": 0.852,
  "sigma_intrados_MPa": 55.1, "sigma_extrados_MPa": 89.1,
  "P_allow_extrados_bar": 63.4,
  "utilization": 0.89, "passed": true
}

Nozzle reinforcement check — returns allowable pressure at the opening.

Temperature-dependent material property lookup.

GET /api/excel/material?name=P265GH&prop=Rp02&T=300
{"value": 166.0, "unit": "MPa", "property": "Rp0.2", "temperature": 300}

Component mass in kg. Supports cylinder, dished_head, flat_end.

GET /api/excel/mass?component=cylinder&Do=1200&t=20&L=3000&material=P265GH
{"value": 1467.3, "unit": "kg"}

GET /api/excel/volume?component=cylinder&Do=1200&t=20&L=3000
{"value": 3166.7, "unit": "dm3"}

Required hydraulic test pressure per the applicable standard.

GET /api/excel/test_pressure?standard=EN12952&P=30&T=236&material=P355GH
{"value": 51.49, "unit": "bar"}

Next standard wall thickness from EN 10216/10220 or ASME B36.10/B36.19.

GET /api/excel/pipe_schedule?Do=219.1&t_min=15.84&standard=EN
{"value": 16.0, "source": "EN 10216 DN200", "unit": "mm"}

Same geometry against multiple standards. Returns a comparison table (array).

Vary one parameter, compute results at each step. Returns headers + rows (array).

List Projects

Create Project

Get Project

Calculate All Components

Generate PDF Report

Using PressureCode as an AI Tool

PressureCode's API is designed to be called by AI agents (LLMs, copilots, automation). Here's how to integrate:

1. Python Agent Example

import requests

BASE = "https://pressure-app-20.tail4f030f.ts.net"
HEADERS = {"X-API-Key": "pc_your_key_here"}

# Check a cylinder
r = requests.get(f"{BASE}/api/excel/cylinder",
    params={"standard": "EN13445", "Do": 1200, "t": 20, "P": 25, "T": 300, "material": "P265GH"},
    headers=HEADERS)
result = r.json()
print(f"Utilization: {result['utilization']:.1%}")  # 66.3%
print(f"Required thickness: {result['e_required_mm']} mm")
print(f"Status: {result['status']}")

# Get material property at temperature
r2 = requests.get(f"{BASE}/api/excel/material",
    params={"name": "P355GH", "prop": "Rp02", "T": 300},
    headers=HEADERS)
print(f"Rp0.2 at 300C: {r2.json()['value']} MPa")

2. Claude / OpenAI Function Calling

Define PressureCode as a tool for your AI agent:

{
  "name": "pressure_calculation",
  "description": "Calculate pressure vessel wall thickness per EN 13445, ASME VIII, etc.",
  "parameters": {
    "type": "object",
    "properties": {
      "standard": {"type": "string", "enum": ["EN13445", "AD2000", "ASMEVIII", "ASMEI", "EN12952"]},
      "component": {"type": "string", "enum": ["cylinder", "head", "cone", "flat_end"]},
      "Do": {"type": "number", "description": "Outside diameter [mm]"},
      "t": {"type": "number", "description": "Wall thickness [mm]"},
      "P": {"type": "number", "description": "Design pressure [bar]"},
      "T": {"type": "number", "description": "Temperature [C]"},
      "material": {"type": "string"}
    },
    "required": ["standard", "component", "Do", "t", "P"]
  }
}

3. Batch Calculation

# Calculate multiple components in sequence
components = [
    {"name": "Drum", "Do": 1800, "t": 25, "P": 30, "T": 236, "mat": "P355GH"},
    {"name": "Header", "Do": 219.1, "t": 12.7, "P": 30, "T": 236, "mat": "P235GH"},
    {"name": "Tube", "Do": 38.1, "t": 3.6, "P": 30, "T": 296, "mat": "P235GH"},
]
for c in components:
    r = requests.get(f"{BASE}/api/excel/cylinder",
        params={"standard": "EN12952", "Do": c["Do"], "t": c["t"],
                "P": c["P"], "T": c["T"], "material": c["mat"]},
        headers=HEADERS)
    d = r.json()
    print(f"{c['name']:10s} util={d['utilization']:.1%} e_req={d['e_required_mm']:.1f}mm")

4. Available Materials

Returns a list of all available materials with their designations and standards.

5. Error Handling