HomeSolutionsDesign Criteria & Parameters Guide
05 · DESIGN PARAMETERS

Design Criteria & Parameters Guide

Design Pressure (Pn), Design Temperature (Tn), and Corrosion Allowance (C.A.)

The technical essentials of the three core governing parameters determining equipment wall thickness, safety factor, and operating lifespan.

Design Criteria & Parameters Guide

The Three Founding Parameters

These three parameters form the foundational starting point for every pressure vessel and heat exchanger calculation.

An inaccurately specified design pressure or insufficient corrosion allowance can compromise plant safety or result in inflated capital expenditures.

Parameter Breakdown

Pn — Design Pressure

The maximum allowable working pressure envelope under the most severe operating conditions. Relief valve settings and hydrostatic test pressures are calculated from Pn.

Tn — Design Temperature

The concurrent maximum and minimum metal temperature boundaries. Tn directly establishes the allowable stress limits of the selected metallurgy.

C.A. — Corrosion Allowance

Sacrificial wall thickness added to the structural minimum to resist chemical fluid loss over the specified design lifecycle (e.g. 1.5 mm - 3.0 mm).

Industrial Applications

All Pressure Vessels
Heat Exchangers & Piping
Reactors & Storage Tanks
DESIGN CODES

Applied Standards

ASME BPVC Section VIII Div. 1
EN 13445-3
API 650
TEMA Standards

Request Technical Proposal

Submit your equipment operational parameters for a tailored engineering sizing proposal.

Get in Touch