Introduction

PSI is a browser-based SaaS platform for structural and pressure vessel engineering calculations, built for mechanical and civil engineers who need fast, code-compliant support designs.

PSI (Pressure vessel Support Indicator) is a React/TypeScript web application that brings rigorous structural and pressure vessel engineering calculations directly into the browser — no installation, no spreadsheets, no manual code lookups. Engineers enter vessel geometry, loading conditions, and support parameters; PSI computes stresses, reactions, and code-compliance checks in real time.

Two Engineering Domains

The application is organized around two principal domains, accessible from the sidebar:

Pressure Elements

Design and analyze supports for pressure vessels — horizontal, vertical column, and spherical geometries. Includes saddle, skirt, leg, lug, and ring support types, each with dedicated parameter forms and result dashboards.

Structural Elements

Analyze beams and perform weld design and analysis. Covers common structural profiles with code-compliant stress checks for industrial and petrochemical plant structures.

Pressure Vessel Support Types

PSI covers all standard support configurations used in the process industry:

Support	Typical Vessel	Key Parameters
Saddle	Horizontal	Height, location, contact angle (120°/150°), web thickness, base plate, rib count
Skirt	Columna vertical	Height, thickness, base diameter, cylindrical or conical geometry, anchor bolts, anchor chairs
Legs (unbraced)	Spherical, Vertical	Quantity (3/4/6/8), profile (Rectangular/Angle/Tube), length, bolt circle
Legs (braced)	Spherical, Vertical	Profiles (Angle L, Beam W/I, Pipe, Square Tube HSS), brace profile, bracing tiers
Lug	Vertical, Spherical	Quantity, elevation, dimensions, eccentricity, optional gusset and pad plate
Ring	Horizontal, Vertical	Profile type A/B, OD/ID, web and flange dimensions, optional gussets, bolt circle

The Anchoring module handles foundation anchor bolt design — bolt quantity, diameter, material (Carbon steel, Stainless steel, A325, A490), embedment depth, concrete strength, and anchor type (Hex Head, L-Hook, J-Hook, Epoxy).

Material Library

Vessel material is selected per calculation and feeds directly into allowable stress lookups:

• Carbon steel
• Stainless steel 304
• Stainless steel 316
• Alloy steel

ASME Section VIII Division 1 and Division 2 material tables are available at /basic-tables and /data-tables respectively, covering the full range of allowable stresses by temperature.

Engineering Code Compliance

PSI supports two seismic design code families, selectable per project:

ASME / ASCE

Site class A through F, mapped spectral accelerations Ss and S1, and response modification factor R. Applicable to US-based projects and international projects adopting ASCE 7.

COVENIN

Venezuelan seismic code. Select state and city, soil type S1 (rock) through S4 (soft), importance group A/B1/B2, and response factor R. All Venezuelan states are available in the location selector.

Wind loading follows a zone-based approach (Zone 1, 2, or 3) with exposure categories B, C, and D and a configurable importance factor — consistent with ASCE 7 wind provisions. A manual wind pressure override (m/s or kPa in SI; mph or psf in US customary) is also supported.

Unit Systems

PSI supports both SI (mm, MPa, °C) and US customary (in, psi, °F) unit systems. Wind inputs accept m/s or kPa in SI, and mph or psf in US. The active unit system applies globally — all input labels and placeholders update automatically with no manual conversion required.

Geometry inputs such as outer diameter, wall thickness, insulation thickness, and support dimensions all adapt their labels to the selected unit system.

Key Features at a Glance

Browser-based

No desktop software or plugins required. PSI runs entirely in the browser and is accessible from any device with a modern web browser.

Real-time results

Calculations update as you type. The analysis dashboard at /soporte-analisis displays metrics, charts, and result tables derived from your current design inputs.

Dark mode

Full dark mode support throughout the interface. Toggle between light and dark themes to suit your working environment.

Print & export

Generate a formatted summary report of your design inputs and results. Print directly from the browser or export to PDF for documentation and client deliverables.

Navigation Overview

The sidebar organizes the application into three sections:

Elementos a presión

• Recipientes (/recipientes-analisis) — Vessel analysis
• Análisis de soportes (/soporte-analisis) — Support results dashboard
• Diseño de soportes (/soporte-diseno) — Support design input form

Elementos estructurales

• Vigas (/vigas-analisis) — Beam analysis
• Análisis de soldadura (/soldadura-analisis) — Weld analysis
• Diseño de soldadura (/soldadura-diseno) — Weld design

Tablas

• Materiales ASME VIII DIV 1 (/basic-tables)
• Materiales ASME VIII DIV 2 (/data-tables)

PSI’s interface is in Spanish, reflecting its primary user base in Latin American engineering practice. This documentation is in English to serve the broadest international audience.