Protective Door Industries (PDI) blast or pressure resistant doors, windows and hatches assure blast protection and dependable service under critical conditions for interior or exterior environments including:


▪ Refineries, petrochemical, plastics and ethylene producers

▪ Chemical plants and other industrial complexes

▪ LNG terminals

▪ Nuclear power plants and generating stations; FLEX projects

▪ Munitions storage facilities, ammunition depots and arsenals

▪ Army proving grounds, explosives test facilities

▪ Missile tests and launch sites

▪ Paint or hazardous material storage rooms

▪ Pharmaceutical or college laboratories and other R&D areas

▪ Bioscience and nanotechnology research buildings

▪ Food processors

▪ Engine test cells

▪ Extreme weather-related conditions

▪ And numerous other applications


Analysis Calculations

To analyze construction, PDI produces a set of calculations which cover all the required variables and resultant loads.  These analysis calculations are performed either statically or dynamically.  Many of PDI’s pre-engineered door systems are analyzed with static analysis completed using simple beam diagrams.  For those applications involving dynamic analysis, PDI completes a dynamic structural analysis based upon elastic plate design methodology under UFC 3-340-02 ‘Structures to Resist the Effects of Accidental Explosions’ (previously Army Technical Manual TM5-1300).

The blast door assembly is designed to meet Process Industry Practices (PIP) standard PIP STC01018 ‘Blast Resistant Building Design Criteria’ response category primarily RL-I undamaged with no permanent deformation or RL-II with slight permanent deformation.  In both cases, the door unit remains fully operable.


Dynamic Blast Door Test

Although the preferred method to evaluate door construction is by analysis calculations (see BLOG), PDI tested Model DB-X, a single swing blast door using dynamic plate analysis at BakerRisk in San Antonio, TX using their shock tube apparatus.  The door assembly achieved a response limit of RL-I ‘undamaged’ with no permanent deformation and remain fully operable.  Refer to DB-X Dynamic Blast Door Test page for full report and video.


Blast Resistant Door Overview

The blast door manufacturer must supply ALL essential components to certify the door system.  A swing door includes the frame, anchorage, hinges, door panel and PDI’s own proprietary Sonicbar blast resistant latchset.  Sliding doors are furnished with track and trolleys – suitable for door weight, door panel and blast restraints.  Any assembly, swing or sliding, can be power operated via electric, electro-pneumatic, all pneumatic or even hydraulic operation.  Prepping for card reader or other access control device is available.


Door models vary from 1 ¾” thk. for very low range with single-point latching to steel plate construction for mid to high range blast loads with 2-point or multi-point latching.  The door leaves are designed for practical solutions, to be as light as possible while allowing maximum protection.  PDI’s frames are factory prepared for masonry, concrete, expansion bolt or weld-in anchorage and shipped set-up and welded or KD knock-down where shipping limitations mandate size for large units.


Various components include:

▪ PDI’s own blast resistant Sonicbar brand hardware available in lever x lever trim OR lever x exit bar device

▪ Door closer (required for UL Fire Labeled swing doors)

▪ Prep for card reader or other access control device

▪ Prep for power operation

▪ PDI’s own H-280W-SS stainless steel Weatherstripping arrangement

▪ Threshold

▪ Vision panel

▪ Transom panel

▪ Stainless steel construction

▪ PE analysis calculations


Blast Resistant Window Overview

Window units are also available to provide penetration resistance to weapons or explosives.  The frames are fabricated of formed or structural steel and furnished with the appropriate glazing material and thicknesses per the blast analysis.


Product Selection

To qualify pressure load, please consult the Establishing Blast Criteria page.  The Blast/Pressure/Missile Chart lists PDI’s pre-engineered and custom door models each designed for a specific blast / pressure range.  Consideration must be given to factors that impact the design such as static or dynamic Pr peak reflected load, seating or unseating direction, rebound percentage, time duration, pressure-time history, impulses, exposure area, etc.  For corresponding maximum sizes available per opening or other design loads, consult PDI’s Technical staff or


Additional notes: 

  • See PDI BLOG titled ‘Analysis Calculations versus Laboratory Test for Blast Resistant Doors’.
  • See PDI BLOG for recommendations specifying blast doors, windows, hatches, louvers, etc.