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EM-NRV NORTH AMERICAN SUPPLEMENTAL MANUAL - V2016NRV-ELE
NFPA COMPLIANCE
NFPA 652 – STANDARD ON THE FUNDAMENTALS OF COMBUSTIBLE DUST – 2016
EDITION
8.9.4 – Equipment Isolation
o
8.9.4 –
Where an explosion hazard exists, isolation devices shall be provided to
prevent deflagration propagation between connected equipment in accordance
with NFPA 69.
o
8.9.4.4 – Isolation of Upstream Work Areas.
Where a dust explosion hazard
exists, isolation devices shall be provided to prevent deflagration propagation
from equipment through upstream ductwork to the work areas in accordance with
NFPA 69.
NFPA 69 – STANDARD ON EXPLOSION PREVENTION SYSTEMS – 2014 EDITION
CHAPTER 12 DEFLAGRATION CONTROL BY PASSIVE ISOLATION
o
12.2.2.3 FLOW ACTUATED FLAP VALVE
The EM-NRV meets all requirements of this section when installed with all options and
conveying ductwork per 12.2.3.4.6
KEY POINTS
12.2.3.4.2
Requires a locking mechanism which is provided standard.
12.2.3.4.3
Requires an Inspection door which is provided standard.
12.2.3.4.4
Requires an immediate, automatic shutdown of the protected process.
Accomplished with O-EM-NRV-MS Microswitch which is an available option that mounts
on the NRV locking mechanism and sends a signal upon an event.
12.2.3.4.5
and
12.2.3.4.5.1
requires a continuous signal to ensure valve operation is not
compromised by the accumulation of a dust layer on the bottom interior of the valve and
requires an immediate, automatic and orderly shutdown of the protected process.
Accomplished with O-EM-NRV-DLS capacitive style Dust Level Sensor (DLS) which
sends a signal when 0.15”-0.20” of dust has accumulated. The DLS is located in the
airstream and requires an intrinsically safe barrier.
12.2.3.5
Requires System Certification by a recognized testing organization.
A.10.4.2.1
allows for European CEN ATEX certification being acceptable.