Critical defence infrastructure engineering

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.

SIM 01 — Non-linear blast FEA · resultant displacement
SIM 02 — Non-linear blast FEA · effective stress
DocumentDVL-CS-001
DisciplineStructural / Blast
VerificationFEA — non-linear dynamic
StatusIssued for review
01 — Approach

Engineering responsibility, not products.

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
Twin-leaf heavy blast door with espagnolette locking, installed in a reinforced concrete opening
FIG. 01 — Twin-leaf blast door, installed
DVL-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
Double-leaf ammunition depot access door with heavy hinges, shown during site installation
FIG. 02 — Depot access door, site installation
DVL-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
3D engineering model of a twin-leaf blast door and frame within a shelter 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
ENG-03Structural engineeringParent material, bolted & welded joints
ENG-04Blast load engineeringLoad definition per project requirements
ENG-05Dynamic structural analysisGlobal & local response verification
FAB-01Heavy steel fabricationIn-house manufacturing & quality control
TST-01Factory acceptance testingVerification before dispatch
SIT-01Installation & commissioningTurnkey site execution & supervision

Design & verification framework

STD-01JSP 482 — UK MoD Explosives RegulationsPrimary blast design & verification criteria
STD-02UFC 3-340-02 — Accidental explosionsUS DoD reference design criteria
STD-03TM 5-1300 — Tri-service blast designReference criteria for protective structures
STD-04EN 10025-2 — Structural steelsMaterial & technical delivery conditions
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
3D CAD model of a chain-driven sliding blast door system with drive unit
FIG. 04 — 3D CAD, sliding door system
Heavy steel blast door leaf on the welding bench during in-house fabrication
FIG. 05 — Heavy steel fabrication, in-house
Blast door undergoing a fire resistance test in an accredited laboratory furnace with test timer running
FIG. 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.

[email protected]
Headquarters — İstanbul, Türkiye+90 212 909 9228
Sofia, Bulgaria+359 88 551 1903
Delaware, US+1 302 918 5539
ScopeDesign · Verification · Fabrication · Commissioning
CooperationPrimes · EPC · OEM · Shelter manufacturers