API Screen Designation Chart (RP 13C) — Field Quick Guide
By Othman Soliman — Solids Control & Drilling-Waste specialist, 26+ yrs (GCC & MENA). Last reviewed .
Free printable quick guide to the API RP 13C screen designation system: API numbers, D100 separation in microns, typical duty per section, and how to screen a shaker correctly.
What's inside the PDF
The full API-number → D100 (µm) table, API 20 to API 400
Typical duty for each designation, top-hole to finest practical
The 4 field rules: record API numbers (not mesh), 75–80% deck coverage, vendor comparison, torn-panel policy
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