Emerson EN-FVFA-0804, EN-FVFA-0603, EN-FVFA-1206, EN-FVFA-1608, EN-FVFA-2412 Instruction Manual
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Instruction Manual
D103771X012
Free Vent Flame Arrestor
September 2017
EN Series Free Vent Flame Arrestor
Table of Contents
Introduction ........................................................................................1
Specifications ....................................................................................2
Principle of Operation ........................................................................3
Factors Affecting Flame Arrestor Performance .................................. 3
Installation .........................................................................................3
Maintenance ......................................................................................5
Recommended Spare Parts ..............................................................7
Parts Ordering ...................................................................................7
Parts List............................................................................................8
WARNING
!
Failure to follow these instructions or to properly
install and maintain this equipment could result in
an explosion, fire and/or chemical contamination
causing property damage and personal injury
or death.
Enardo flame arrestor must be installed, operated
and maintained in accordance with federal,
state and local codes, rules and regulations,
and Emerson Process Management Regulator
Technologies Tulsa, LLC instructions.
Failure to correct trouble could result in a
hazardous condition. Call a qualified service
person to service the unit. Installation, operation
and maintenance procedures performed by
unqualified person may result in improper
adjustment and unsafe operation. Either condition
may result in equipment damage or personal
injury. Only a qualified person must install or
service the flame arrestor.
Figure 1. Typical Enardo Free Vent Flame Arrestor
Introduction
Scope of the Manual
This Instruction Manual provides instructions
for installation, startup, maintenance and parts ordering information
for the Enardo Free Vent Flame Arrestor (FVFA).
Product Description
Enardo Free Vent Flame Arrestors are designed to allow free venting
in combination with flame protection for vertical vent applications.
This product is installed at the top of an atmospheric vent line or
storage tank.
Free Vent Flame Arrestors are typically used for the end of
line applications when the system operating pressure is near
atmospheric levels and when there is minimal probability of a flame
stabilizing on the flame arrestor element for an extended period.
North America Only
Free Vent Flame Arrestor
Specifications
The Specifications section lists the specifications for the Free Vent Flame Arrestors. The following information is stamped on the nameplate attached
to the arrestor: model number, flange size and rating, maximum initial operating pressure, EN number (European Standard), EC type examination
certificate, notified body number, gas group, date of manufacture and serial number; other identification and customer tag number are optional.
Available Constructions
See Table 1 and Figure 2
Gas Group
IIA and IIB3
Burning Time Rating
Less than 1 minute
Housing Material
Carbon steel, 304 Stainless steel,
316 Stainless steel and Hastelloy
®
Flange Sizes and Rating
2 to 12 inches / 50 to 300 mm
CL150 RF and CL150 FF
Element Material
304 Stainless steel, 316 Stainless steel
and Hastelloy
®
Housing Size
4 to 24 inches / 100 to 600 mm
Operational Temperature (To)
(1)
EN Number (European Standard)
EN ISO-16852
140°F / 60°C
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
EN / - - FVFA
Housing
Size
04 = 4 inches
through
24 = 24 inches
Connection
Size
01 = 1 inch
through
12 = 12 inches
IEC
Gas
Group
IIA
IIB3
Housing
Material
C = Carbon Steel
4 = 304 SST
6 = 316 SST
H = Hastelloy
®
Element
Material
4 = 304 SST
6 = 316 SST
H = Hastelloy
Connection
F = Flat face
®
R = Raised
Type
ange
face
ange
Options
2 = Pressure Tap
3 = Temperature Probe Tap
4 = Miscellaneous
5 = Protective coating
6 = Special feature
North America Only
Figure 2. Free Vent Flame Arrestor Available Constructions and Model Numbering System
Table 1. EN FVFA Series Available Construction
MODEL
EN-FVFA-0402 2 50 4 100
EN-FVFA-0603 3 75 6 150
EN-FVFA-0803 3 75 8 200
EN-FVFA-0804 4 100 8 200
EN-FVFA-1206 6 150 12 300
EN-FVFA-1608 8 200 16 400
EN-FVFA-2010 10 250 20 500
EN-FVFA-2412 12 300 24 600
Hastelloy® is a mark owned by Haynes International, Inc.
2
Inch mm Inch mm
FLANGE SIZE HOUSING SIZE
Free Vent Flame Arrestor
WARNING
Flame Arrestors have installation and application limits
Type designation in accordance with EN ISO-16852:2010
DEF L
/D = n/a
u
Ex. G IIA To = 60°C Po = 0.10 MPa (absolute)
MARKING PLATE (SEE TABLE 2)
BC: b; t
= 1 min
BT
Figure 3. Free Vent Flame Arrestor
Table 2. Marking Plate Information (See Figure 4)
INFORMATION DESCRIPTION
DEF Indicates product is a Deagration Flame Arrestor
Lu/D = n/a
BC: b Indicates the ame arrestor is for short-time burning, not to exceed 1 minute
Ex. G IIA Indicates the arrestor is rated for use in Explosion Group IIA vapors
T
o
P
o
The ratio of pipe length (between the potential ignition source and the ame arrestor) and pipe diameter.
Indicates end-of-line conguration. Prevents unconned deagration from entering a tank or enclosure
Indicates maximum operational temperature of ame arrestor
Indicates maximum operational pressure of ame arrestor
Principle of Operation
The Free Vent Flame Arrestors prevent flame propagation by
absorbing and dissipating heat using spiral wound crimped ribbon
flame cells. These cells allow maximum flow with maximum
protection. The Free Vent Flame Arrestor is used to stop the
propagation of confined and unconfined low pressure deflagrations.
It prevents an ignited atmospheric vapor cloud from propagating
beyond the flame arrestor into the vent line or tank.
Free Vent Flame Arrestors allow free venting and flame protection
for vertical vent applications. Designed with flanged connections,
this arrestor allows removal of the flame cell element without their
removal of the venting assembly.
Factors Affecting Flame
Arrestor Performance
Gas Group
The type of gas in the system determines its gas grouping and
therefore predetermines the type of arrestor element required.
The element must be designed to accommodate the specific gas
group that could possibly ignite and propagate in the system. The
more explosive gases require the flame cell to absorb the heat
more quickly and efficiently. The International Electrotechnical
Commission (IEC) groups gases and vapors into Groups IIA through
IIC categories depending on a number of factors including the
Maximum Experimental Safe Gap (MESG) of the gas.
Maximum Initial Operating Pressure
The Free Vent Flame Arrestor is intended to operate at atmospheric
pressure when at or near static flow conditions.
HAZARDOUS LOCATIONS
Figure 4. Product Identification and Marking
Burn Time Rating
CAUTION
Temperature sensors must be used with this
product. The response time of the sensor must be
at least as fast as that of a Type K thermocouple
in a stainless steel sheath. The tip of the sensor
should be installed such that it is within 5 inches /
125 mm of the face of the element assembly. Never
disconnect or remove these devices.
All Enardo EN FVFA Series flame arrestors are rated for short time
burning with a temperature sensor in place. If no temperature sensor
is installed, this product is not suitable for short time burning.
Installation
WARNING
!
Verify that the flame arrestor being installed has the
appropriate gas group rating for your process. This
information is shown on the nameplate attached
to the element housing. Do not remove or alter
this nameplate.
Always make sure that the system is at atmospheric
pressure and there is no ignitable gas that could flash
when either installing or maintaining the unit.
Connection
Enardo flame arrestors are normally provided with CL150 raised or
flat face flanges. Other flange patterns including DIN patterns are
available upon request. Make sure the companion flange installed in
adjacent piping matches the flange on the flame arrestor. For proper
bolt torquing of the flame arrestor flange to the piping, please refer
to Tables 4, 5 and 6.
North America Only
3
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