Guides
Rupture disc
How to Size a Rupture Disc for Gas Service (API 520)
The coefficient-of-discharge method step by step: relieving pressure, the gas constant C, required flow area and choosing the disc size, with a worked example.
Safety valve
Safety Valve Orifice Letters D to T: Areas and Selection
What the API 526 orifice letters mean, the effective and actual area of each one, the valve size that goes with it, and how to pick the right letter.
Explosion vent
KSt and Pmax Values of Common Dusts
What KSt and Pmax measure, the St 1 / St 2 / St 3 dust explosion classes, typical values for common dusts, and why your own dust should be tested.
Explosion vent
NFPA 68 Explosion Vent Area Calculation, Step by Step
The NFPA 68 dust venting equation explained term by term, the corrections for tall vessels, partial filling and vent ducts, and a worked example.
Selection
Rupture Disc vs Safety Valve: When to Use Which
How the two devices differ in leakage, speed, reclosing and cost, when each is the better choice, and when to install both in series.