How is the safety of pressure vessels ensured?
Pressure vessel safety
Key points
- Hydrostatic pressure test: 130% MAWP for minimum 30 minutes per EN 13445
- Standards: PED 2014/68/EU, Dutch Commodities Act Decree on Pressure Equipment, IEC 61511 SIL for pressure protection
- HECHT CPS containment system for safe maintenance of pressure vessels with HPAPI (OEB 3–5)
- PSV setting: Max. 110% MAWP; periodic PSV test every 2–5 years per API 576
- Periodic inspection: Every 2 years external inspection + every 10 years hydrostatic retest
Pressure vessel safety is a legal obligation and business-critical risk management. Learn more about HECHT pressure vessels with integrated safety devices, discover HECHT CPS containment for safe pressure vessel maintenance, and view our complete hygienic process equipment with PED certification.
FAQ — pressure vessel safety
How is pressure vessel safety ensured?
Safety is ensured through five parallel measures: correct design per PED 2014/68/EU, manufacturing qualification (weld qualification, NDT, hydrostatic test), certified safety devices (PSV set to MAWP, rupture disc as second protection layer), periodic inspection by recognized inspection body per Dutch Commodities Act Decree on Pressure Equipment, and safe operating procedures with written safety measures (LMRA, toolbox).
How often must a pressure vessel be inspected in the Netherlands?
Per Dutch Commodities Act Decree on Pressure Equipment: external visual inspection every 2–4 years, internal inspection every 4–10 years depending on product category and working pressure, hydrostatic retest every 10 years. Recognized inspection bodies are Kiwa, Bureau Veritas, TÜV Rheinland, and Lloyd Register. The owner is responsible for timely inspection.
What is lockout/tagout and when is it mandatory for pressure vessels?
Lockout/tagout (LOTO) is a safety procedure where energy isolation (steam valves closed, pressure vessel depressurized) is secured with personal locks and labels before maintenance begins. In the Netherlands mandatory per Working Conditions Decree art. 3.6 and ISO 13849-1 PLd for pressure vessels above 0.5 bar. For pharmaceutical pressure vessels supplemented with GMP-compliant change control and ALCOA+ documentation.
Author: Joost van Velzen, Director Hecht Technology B.V.
Related reading
- Pressure Vessels Guide
- Pressure Vessel for German Chemical Multinational
- Pressure Vessels Process Installations Regulations
- What Is the Difference Between REACH and Other Chemical Regulations