Real engineering, written down.
In-depth guides on process design, equipment sizing, and code interpretation — from real oil & gas projects, written by a Technical Director with 20+ years of design experience.
Equipment Sizing in Oil & Gas: Step-by-Step Guide for Process Engineers
A complete reference for sizing separators, pressure vessels, heat exchangers, pumps, compressors, PSVs, and fired heaters — built around the 2026 editions of API 12J, ASME VIII, API 520/521, and API 610.
Read the full guide// SOUDERS-BROWN VELOCITY
Vmax = K √[(ρL − ρG) / ρG]// 50 MMSCFD @ 1000 psigρG = 3.61 lb/ft³
Vmax = 1.255 ft/s
Di = 34.1″
// SELECT 36" NPS ✓
The Three Lives of a Pressure Vessel
A working engineer’s notes on the pressure vessel lifecycle — from ASME VIII Div.1 design through fabrication and PWHT to API 510 inspection and API 579 fitness-for-service.
API 12J · Vessel DesignAPI 12J Separator Design: The Complete Engineer’s Guide to Souders-Brown Sizing
Full walkthrough of two-phase separator sizing — the Souders-Brown equation, K-value selection, gas density at actual conditions, and the mistakes that produce undersized vessels.
API 520 · Pressure ReliefPSV Sizing Using API 520: Gas Orifice Calculation Worked Example
Step-by-step pressure relief valve sizing for gas service — critical flow equation, coefficient C from k, Kd, backpressure correction, and API 526 orifice selection.
NACE MR0175 · Sour ServiceNACE MR0175 / ISO 15156: What Every Process Engineer Must Know About Sour Service
The 0.05 psia H₂S partial pressure threshold, hardness limits for carbon steel, PWHT requirements, acceptable materials, and what changes when a project turns sour.
ASME B31.3 · PipingASME B31.3 Pipe Wall Thickness Calculation: Step-by-Step Worked Example
Complete ASME B31.3 Equation 3a calculation — allowable stress, quality factor, Y-coefficient, mill tolerance, corrosion allowance, and schedule selection from B36.10.
2026 Guide · Master ReferenceEquipment Sizing in Oil & Gas: 2026 Standards Master Guide
The flagship reference — sizing methods for 8 equipment categories, 2026 standards update table, pre-submittal checklist, and 9 worked examples from real EPC projects.
Heat Transfer · First PrinciplesIndirect Water Heater Design from First Principles
Designing an indirect water bath heater from scratch — heat duty calculation, coil sizing, fired tube selection, and how the design changes for sour vs sweet service.
