Blast Shafts on Haz-Safe Buildings:

Custom modular building (above photos), designed using three 10′ wide x 50′ long modular units shipped separately to site and bolted together (patented method), making first Factory Mutual approved 1500 sq. ft. warehouse. There are five blast shafts bolted over outside of ten 8′ x 4′ explosion relief panels, permitting this hazmat building to be placed close to main plant and oxidizer facility. Note: Blast shaft on end of building wall.

Upward type blast shaft (patented) open at top permitting snow and rain to pass down through. During an explosion, the open bottom of shaft is filled in when bottom hinged relief panel is forced open, causing blast effects to go straight up out of harm’s way.

Open bottom of left blast shaft allows rain and snow to pass through and shows closed explosion relief panel. Relief panel on right in open position fills bottom of shaft, forcing blast effects out open top of shaft, allowing building to be placed near other facilities. Shafts are blast rated.

Blast Shafts on Conventional Damage Limiting Construction:

User has constructed a new concrete damage limiting exterior common wall for (3) rooms each requiring (2) 8′ wide x 4′ high explosion relief panels. But this is the employee parking lot. When this picture was taken (2) Haz-safe Blast Shafts have already been installed.

Crane is lifting Blast shaft as workers guide it into the 8′ square opening of the concrete wall.The shaft is open at the top and the lower portion of the bottom angle allowing rain and snow to pass through. Blast effects shall be redirected straight up.

Blast Relief Shaft Assembly installed in concrete wall opening and bolted in place. Mechanical installation complete when side and top flange is properly caulked and covered with flashing.

Blast Shaft Roof Top Cupola on Conventional Damage Limiting Construction:

White 9,000 lbs. Roof Top Blast Shaft Cupola is being lifted off tractor/trailer during delivery. This is at the back parking lot, but the roof top opening is 200′ over the roof toward the front of the building. This takes a very tall crane to make the reach.

The bottom of the cupola is an open vertical shaft that connects to a separate shaft proceeding up from an interior hazmat room with no external walls. The top of the shaft has a roof. On opposite walls of the vertical shaft are (2) 8′ wide x 4′ high explosion relief panels covered by a blast shaft open at the top and angled bottom.

The crane holding the cupola is more than 200′ to the behind the workmen on the left. On the lower level roof the cupola is being guided into the opening in the user’s roof. The job is complete when the moisture proof flashing is in place. During an explosion the blast effects are directed up into the sky, therefore the roof surface will not catch fire.