WHST Wellhead Hold-Test Workflow

• Technicians and engineers running wellhead system tests (WHST) or similar high-pressure holds on subsea or surface wellhead equipment.
• QA witnesses reviewing contractor hold evidence before sign-off on an operator test pack.
• Teams that export Crystal nVision CSV from CrystalControl and need consistent drop %, delta checkpoints, and PDF layout.

Operator and contractor procedures vary. Many offshore WHST packs specify a nominal test pressure (for example 345 bar), a hold duration (often 15 minutes after stabilization), and a percentage acceptance limit (commonly 2% drop on a falling hold).

Your report metadata—procedure code, description, gauge serial, and calibration due—should match the fields required by the test pack. PressureTrend’s suggested PDF filename follows the same pattern: date, procedure, description, pressure, duration, and criteria.

• Nominal test pressure: set on the chart; optional minimum-pressure check fails if pressure drops below nominal inside the window.
• Hold window: drag start/end on the pressure trace to match the stabilized hold period defined in your procedure.
• Criteria %: use the value from your WHST spec (2% is common; some subsea holds use 5%—see the API 16C criteria guide when a dual limit applies).
• Delta checkpoints: 2–8 steps along the hold to show whether drop accelerates late in the hold.

• Crystal nVision logger attached during the hold (or a valid export from the test).
• CrystalControl (Windows) to export CSV after the test.
• The approved WHST procedure and operator test-pack template for report fields.
• A modern web browser (Chrome, Edge, Firefox, or Safari).

• Export CSV from CrystalControl when the hold is complete (standard nVision export—avoid heavily customised templates unless your procedure requires them).
• Open PressureTrend and drop the CSV on the home page.
• Complete Import setup if the file lists several gauges or pressure channels.
• Run time calibration if the logger clock shows AM/PM ambiguity.
• Set nominal test pressure, criteria %, and checkpoint count to match your WHST procedure.
• Drag the test window onto the stabilized hold segment; use nudge controls if your procedure defines hold start by time step.
• Read Passed / Not passed on the result card; review hold direction (↑ ↓ —) and delta colours before sign-off.
• Fill report fields (procedure, description, test date, gauge serial, signatures as required).
• Export PDF via the browser print dialog (Landscape). See the PDF report export guide for comparison sessions and filename conventions.

Witnesses typically check that the chart covers the full hold window, that criteria match the procedure, and that gauge metadata on the report matches the logger export.

Use the interpretation guide for the same pass/fail rules shown on the result card—hold direction, red deltas on falling holds, and optional temperature review.

Your CSV is parsed in the browser. Nothing is uploaded to PressureTrend servers in the current version—suitable for sensitive offshore environments with restricted connectivity after the page loads.