M&W Pressure Relief Systems has delivered a new 10,000 psi (690 bar) Annulus Pressure Relief System (APRS) for a major North Sea operator with exceptionally high technical and safety requirements.
The project began with a direct customer request for a high-pressure safety solution for oil & gas well stimulation and intervention operations, where annulus overpressure protection is critical.
From initial inquiry to engineering design, in-house manufacturing, testing and DNV type approval, the entire process was completed in less than six months, compared to the industry norm of 12–24 months.
The APRS is based on burst disc technology, providing highly accurate, passive and fail-safe annulus protection for high-pressure well stimulation jobs.
The new unit was fully engineered, machined, welded, assembled and pressure-tested at Mark & Wedell’s facilities.
Both the 10,000 psi (690 bar) and the 6,000 psi (420 bar) variants are now type approved by DNV under Certificate TAP0000190.
As part of the development, M&W produced a new burst disc specification and geometry suitable for operating pressures up to 10,000 psi (690 bar).
For this specific project, the customer selected a 7,300 psi (503 bar) burst disc setting, which was fully validated including assessment of the disc housing, sealing interface and micro-weld integrity as documented in the DNV FEA and approval basis.
![Figure 3-20 Lf1p2 Operational condition. Von Mises stresses [MPa]. Maximum 152 MPa.](https://mark-wedell.com/wp-content/uploads/2025/11/DNV-Operational-condition.webp)
M&W Pressure Relief Systems has supplied APRS solutions to the oil and gas industry since 1995, with more than 1,000 well stimulation operations completed worldwide using our systems.
Both APRS models — 6,000 psi and 10,000 psi — are available through M&W Pressure Relief Systems.
