We engineer mission‑specific protection systems for critical defence infrastructure.
Heavy blast, ballistic and access systems — designed, verified, fabricated and commissioned for strategic military and governmental facilities where operational continuity and structural integrity are essential.
A blast door is the final deliverable — not the product. What we actually deliver is engineering responsibility: blast load definition, non-linear dynamic analysis, project-specific design, verification, heavy steel fabrication and site commissioning, carried as one continuous scope.
Every system is developed for its mission and its facility. We do not adapt a catalogue; we engineer to the load case, the geometry and the standards specified by the project.
For prime contractors and EPC teams, that means one thing: we reduce engineering risk.
S1AnalysisBlast load & FEA
S2DesignProject-specific CAD/CAE
S3VerificationDynamic structural checks
S4FabricationHeavy steel, in-house QC
S5CommissioningFAT & site execution
02 — Systems
What we engineer
DVL-HBP
Heavy blast protection systems
Mission-specific heavy protection systems engineered for demanding defence infrastructure — sliding and swing configurations, developed through non-linear blast FEA.
Sliding & swing configurations
Electric motor drive · manual chain backup
Verified for post-blast operability
FIG. 01 — Twin-leaf blast door, installedDVL-MCA
Mission-critical access systems
Engineered access solutions for military and strategic facilities, where controlled entry must coexist with structural protection.
Single & double-leaf swing systems
Multi-point latching · heavy hinge sets
Motorized or manual operation
FIG. 02 — Depot access door, site installationDVL-SPE
Structural protection engineering
Protection systems developed through advanced structural engineering and project-specific verification, from load definition to site handover.
Blast loads per JSP 482 · UFC 3-340-02
Internal & external detonation cases
Engineered anchoring to host structure
FIG. 03 — Twin-leaf door system, engineering model
03 — Capabilities
Complete in-house engineering
ENG-01Finite element analysisNon-linear explosion & blast simulation
ENG-02CAD / CAE engineering3D design & model preparation
VER-01Dual-scenario blast FEAInternal & external detonation cases per project
VER-02Post-blast operabilitySystems verified to remain operable after design blast
VER-03Fire resistance testingFull-scale tests at an accredited independent laboratory
VER-04Independent analysis reportingProject-specific FEA reports issued for client review
FIG. 04 — 3D CAD, sliding door systemFIG. 05 — Heavy steel fabrication, in-houseFIG. 06 — Fire test, accredited laboratory
04 — Applications
Where our systems operate
A1Ammunition manufacturing facilities
A2Ammunition storage depots
A3Missile storage facilities
A4Hardened aircraft shelters
A5Underground command centres
A6Military tunnels
A7Naval infrastructure
A8Defence industrial facilities
A9Critical government infrastructure
05 — References
Selected delivered work
REF-01
Blast protection door systems — GCC defence programme
Motor-driven sliding and double-leaf swing blast protection systems, engineered and FEA-verified to JSP 482. Independent blast analysis reports covering internal and external detonation scenarios were issued for client review. Delivered and commissioned on site.
REF-02
Ammunition depot access systems
Heavy double-leaf access doors for ammunition storage infrastructure — multi-point latching, heavy hinge sets and service-colour finishes. Fabricated in-house, installed and commissioned at the facility.
REF-03
Fire-tested protection systems
Door systems subjected to full-scale fire resistance testing at an accredited independent laboratory as part of project acceptance, alongside structural blast verification.
06 — Why Durvall
Engineering before manufacturing
Our position is simple: every claim we make should survive the question “can you prove it?” — asked by a prime contractor’s engineer, a program manager or a procurement director.
Engineering before manufacturing
Analysis and verification precede every fabrication decision.
Project-specific solutions
Designed to the load case and facility — never adapted from a catalogue.
Complete in-house engineering
FEA, CAD/CAE and structural verification under one roof.
Heavy engineered systems
Protection systems built for mass, verified for response.
Flexible OEM cooperation
Engineering and fabrication capacity for primes, EPCs and shelter manufacturers.
Long-term partnership
Structured for approved-vendor relationships, not one-off supply.
07 — Contact
Start with an engineering conversation.
Send us your project scope, load case or facility requirements — we respond with engineering, not a brochure.