25
GLOBAL
INDUSTRIES, INC.
M36 - M48 Bucket Elevator
10230004
2015-08-31
Explosion Vent Locations
Specifications
NOTE:
See
for additional information related
to grain dust explosions.
State and local codes may require explosion
vents for this bucket elevator. NFPA (National
Fire Protection Association) Standard 61
(1999) has established recommended
practices for the placement of these vents.
NFPA61, section 5 - 4.1.2 states in part the
following: “All newly installed outside legs
handling bulk raw grain shall be provided with
explosion relief panels, located at intervals
no greater than 20’ [6 m] along the casings.
To minimize personnel exposure, explosion
venting for outside legs shall start between
8’ [2,438 mm] and 12’ [3,657 mm] above
grade, or the bottom of the explosion vent
shall be within 1’ [305 mm] to 4’ [1,219 mm]
after the leg penetrates the building roof.” It is
your responsibility to know what the specific
requirements are for your installation.
The examples
on
this page and the next
depict
the requirements of NFPA61 5 - 4.1.2.
a) Leg Extending Through a Building
20’ [6,096 mm]
maximum
EXPLOSION VENT
in head
minimum 2’ [610 mm]