Emerson EN-FVFA-0804, EN-FVFA-0603, EN-FVFA-1206, EN-FVFA-1608, EN-FVFA-2412 Instruction Manual
...
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
Free Vent Flame Arrestor
Table 3. Torque Values for Raised Face Flange (Steel Only)
NOMINAL PIPE DIAMETER NUMBER OF BOLTS
1 4 0.50 12.70 9 12.20
1-1/4 4 0.50 12.70 13 17.63
1-1/2 4 0.50 12.70 18 24.40
2 4 0.63 16.00 35 47.45
2-1/2 4 0.63 16.00 41 55.59
3 4 0.63 16.00 60 81.35
3-1/2 8 0.63 16.00 34 46.10
4 8 0.63 16.00 43 58.30
6 8 0.75 19.05 80 108.5
8 8 0.75 19.05 109 147.8
10 12 0.88 22.4 101 136.9
12 12 0.88 22.4 135 183.0
14 12 1.00 25.0 168 227.8
16 16 1.00 25.0 159 215.6
18 16 1.13 28.7 244 330.8
20 20 1.13 28.7 214 290.2
24 24 1.25 31.8 253 343.0
Assumptions: Use of SAE grade 5 bolts or studs or stronger
Notes: If lubricant is used on bolts, apply torque reduction factor listed in Lubricant Table. For best results hardened steel washers should be used on all cast flange bolted connections.
No lubricant
Compressed mineral fiber material or similar
BOLT DIAMETER TORQUE
In. mm Ft-lbs N•m
Table 4. Torque Values for Flat Face Flange (Steel or Aluminum)
NOMINAL PIPE DIAMETER NUMBER OF BOLTS
1 4 0.50 12.70 14 18.98
1-1/4 4 0.50 12.70 16 21.69
1-1/2 4 0.50 12.70 18 24.41
2 4 0.63 16.00 32 43.39
2-1/2 4 0.63 16.00 43 58.30
3 4 0.63 16.00 47 63.72
3-1/2 8 0.63 16.00 26 35.25
4 8 0.63 16.00 32 43.39
6 8 0.75 19.05 49 66.44
8 8 0.75 19.05 68 92.20
10 12 0.88 22.4 69 93.55
12 12 0.88 22.4 98 132.9
14 12 1.00 25.0 138 187.1
16 16 1.00 25.0 125 169.5
18 16 1.13 28.7 142 192.5
20 20 1.13 28.7 135 183.0
24 24 1.25 31.8 156 211.5
8 API 16 0.50 12.70 20 27.12
20 API 16 0.63 16.00 75 101.7
24 API 20 0.63 16.00 75 101.7
Assumptions: Use of SAE grade 5 bolts or studs or stronger
Notes: If lubricant is used on bolts, apply torque reduction factor listed in Lubricant Table. For best results hardened steel washers should be used on all cast flange bolted connections.
No lubricant
Elastomer < 70 Durometer Shore A
BOLT DIAMETER TORQUE
In. mm Ft-lbs N•m
North America Only
4
Free Vent Flame Arrestor
Table 5. Torque Correction Factors for Common Lubricants Applied on Flanges
DESCRIPTION COEFFICIENT OF FRICTION MULTIPLY TORQUE VALUE IN TABLE 3 BY
Machine Oil f = 0.15 0.75
API SA2 Grease f = 0.12 0.60
Never-Seez® (Ni base)
Never-Seez® (Cu base)
Molykote® G-n Paste
f = 0.11 0.55
f = 0.10 0.50
f = 0.06 0.30
Positioning
WARNING
!
No instrument, tubing or other device whatsoever
shall circumvent the flame arrestor in such a
manner to allow a flame path to exist around
the flame element of the arrestor. When
instrumentation is installed in such a manner that
it creates a path circumventing the flame element
of an arrestor, measures must be taken to prevent
passage of flame through the instrumentation
device and/or system. Instrumentation must
be capable of withstanding the maximum and
minimum pressures and temperatures to which the
device may be exposed.
CAUTION
The flame arrestor is fitted with lugs for lifting the
element assembly during servicing operations.
These lugs are not intended for lifting the entire
unit during installation. Damage to the flame
arrestor may result from improper lifting. Heavy
units should be lifted using appropriately rated
Nylon (PA) straps rigged on the outside of the
tension studs.
The Free Vent Flame Arrestors should be positioned in a vertical
orientation. Models that have pressure taps are designed to allow
the installation of a pressure gauge determine blockage. The
pressure gauge will normally be mounted vertically.
3. Arrestor elements shall not be cleaned by rodding to remove
blockages, as this practice could damage the elements and
seriously impair the arrestor’s performance. If the arrestor
element cannot be cleaned satisfactorily, it must be replaced.
4. If the flame arrestor sustained a burning event, thoroughly
inspect the element for any sign of damage. Replace the
element assembly if distorted crimps are visible, particularly
near the outer periphery of the flame element. Replace gaskets
if any damage is noted.
5. For best cleaning results, a high pressure sprayer with spray
wand should be used (1500 to 3000 psig / 103 to 207 bar) to
clean the entire element surface. The spray nozzle should be
held perpendicular to the surface being cleaned to maximize
spray media penetration into the element. Alternately spray
each side of the element surface until clean.
6. The cleaning interval should be governed by the amount and
type of particulate in the system to which it is installed and
must be determined by the user. To determine the maintenance
interval the user should check the element in the first few
months of operation to find how quickly particulate accumulates
in the cells.
Note
Under no circumstance should the element bank
be disassembled from its shell for cleaning
or replacement.
7. After cleaning, thoroughly inspect the element for damage. If
damaged, replace the element. Replace the element section as
a complete assembly.
Element Disassembly
North America Only
Piping Expansions and Reductions
Adjacent to Flame Arrestors
An Enardo Free Vent Flame Arrestor may be installed in any vapor
control line that is smaller than or equal to the nominal pipe diameter
of the arrestor’s connection flanges.
Maintenance
1. Keep the element openings clean to prevent loss of efficiency
in absorbing heat. Remove the element assembly and clean
the elements to prevent the openings from becoming clogged
with particulate matter.
2. Clean the element with a suitable cleaning media (solvent,
soap, water or steam) then blow dry using compressed air.
Special care should be taken not to damage or dent the cell
openings as this would hamper the effectiveness of the unit.
Never-Seez® is a mark owned by Bostik, Inc.
Molykote® G-n is a mark owned by Dow Corning Corporation.
WARNING
!
Isolate gas supply and bring system to
atmospheric pressure to prevent ignitable gas
from flashing while performing maintenance.
1. Remove the top wing nuts.
2. Remove the hood and screen. It is not necessary to remove the
hex nuts located directly under the hood. These nuts are used
for positioning the hood.
CAUTION
The screen might have sharp edges. Use care
when handling.
3. Remove the upper nuts from the tensioning studs.
4. Remove the upper flange.
5. Remove the element assembly.
5
Free Vent Flame Arrestor
1
4
PATTERN 1 PATTERN 3PATTERN 2 PATTERN 4
1
32
36
54
2
16
12
8
4
18
14
10
6
4 5
1
20
2
5
15
19
18
36
72
9
13
17
3
7
11
10
8
4
6
1
5
3
7
9
2
PATTERN 5
Figure 5. Flange Pattern Tightening Sequence
Table 6. Tightening Steps and Torque Values
ENARDO EN FREE VENT FLAME ARRESTOR SERIES WITH STEEL
OR STAINLESS STEEL END SECTIONS ONLY
Model Pattern
(2)
Step 1 Step 2 Step 3 Step 4 Step 5
EN-FVFA-0401
EN-FVFA-0401.5
EN-FVFA-0402
EN-FVFA-0603
1 Snug 20 / 27 50 / 68 - - - - - - - EN-FVFA-0802
EN-FVFA-0803
EN-FVFA-0804
EN-FVFA-1206 2 Snug 20 / 27 50 / 68 - - - - - - - -
EN-FVFA-1608 3 Snug 25 / 34 50 / 68 80 / 108 - - - -
EN-FVFA-2010 3 Snug 25 / 34 50 / 68 75 / 102 100 / 135
EN-FVFA-2412 4 Snug 35 / 47 70 / 95 100 / 135 130 / 176
EN-FVFA-3014 and EN-FVFA-3016 5 Snug 35 / 47 70 / 95 100 / 135 130 / 176
1. Using machine oil as lubricant. See Bolt Lubrication section below and torque correction factors for other lubricants in Table 7.
2. See Figure 5.
TIGHTENING STEPS AND TORQUE (FT•LB / N•m)
(1)
North America Only
6
Free Vent Flame Arrestor
Table 7. Torque Correction Factors for Common Lubricants
DESCRIPTION COEFFICIENT OF FRICTION MULTIPLY TORQUE VALUE IN TABLE 6 BY
Machine Oil f = 0.15 1.00
API SA2 Grease f = 0.12 0.80
Never-Seez® (Ni base) f = 0.11 0.73
Never-Seez® (Cu base) f = 0.10 0.67
Molykote® G-n Paste f = 0.06 0.40
CAUTION
Some element assemblies are heavy and will
require the use of adequate equipment and
manpower to prevent injury.
Element Re-assembly
1. Thoroughly clean the gasket sealing faces being careful not to
damage the sealing surface. Lightly grease one side of a new
gasket and place it in the machined recess of the interior flange
on the conical sections and in the upper flange.
2. Replace the flame element assembly with a new assembly or
properly cleaned and inspected existing unit.
3. Re-assemble in the reverse order of disassembly.
4. Tighten the tensioning studs as detailed below:
CAUTION
Excessive or uneven torquing can cause
permanent damage to gaskets and housing.
Tools/Supplies Required:
• Torque wrench appropriate for the specified torque.
• Socket wrenches of the proper size to fit the hex nuts
being tightened.
• Molydisulfide based lubricating paste. Molykote® G-n
or equivalent.
• Brush suitable for applying lubricant to the studs.
• Wiping rags necessary for the clean-up of excessive lubricant.
Procedure:
1. Use studs and nuts that are free of visible contamination
and corrosion.
2. Apply lubricant to the threads of the stud protruding outboard
of the interior flanges and to the face of the hex nuts which
will contact the flange.
3. Assemble the nuts to the studs such that the amount of thread
extending outboard beyond the nut is approximately equal on
both ends.
4. Tighten the nuts to the values shown in Table 6 following the
designated sequence, repeating the sequence as shown.
Flange pattern tightening sequences are shown in Figure 5.
Bolt Lubrication
Enardo provides low friction polymer coatings on carbon steel
fasteners. No additional lubrication should be required. When
stainless steel fasteners are provided, lubrication is recommended
to reduce tightening torque and to prevent potential galling.
Lubrication will affect required torque of clean fasteners in good
condition more than any other factor. In fact, 90% of applied torque
goes to overcome friction while only 10% actually stretches the bolt.
Table 6 assumes that only machine oil is used as a lubricant. Table 7
lists several common lubricants and their effect on torque required to
stretch bolts to 50% of their yield strength. Most are available from
local bearing distributors.
Recommended Spare Parts
For installations that require frequent maintenance and minimum
downtime it is recommended that the user purchase a spare
element assembly and several spare element gaskets. The spare
element assembly can be installed immediately and the dirty
assembly can then be cleaned and be stored as a spare for the next
maintenance interval.
Note
Element gaskets should be replaced each time the
cell assembly is loosened and removed to insure a
gas tight seal.
Parts Ordering
When corresponding with your local Sales Office about this
equipment, always reference the equipment serial number stamped
on the nameplate.
When ordering replacement parts, specify the complete 7-character
part number of each required part as found in the following parts list.
North America Only
Never-Seez® is a mark owned by Bostik, Inc.
Molykote® G-n is a mark owned by Dow Corning Corporation.
7
Free Vent Flame Arrestor
Parts List
Table 8. Replacement Element Assembly Gaskets
MODEL
EN-FVFA-0401, EN-FVFA-0401.5 and EN-FVFA-0402 7008153 7049253
EN-FVFA-0603 7008134 7049234
EN-FVFA-0802, EN-FVFA-0803 and EN-FVFA-0804 7008123 7049223
EN-FVFA-1206 7008136 7049236
EN-FVFA-1608 7008107 7049207
EN-FVFA-2010 7008109 7049209
EN-FVFA-2412 7008111 7049211
1. Two required per assembly
Standard Gasket
(Compressed Fiber)
Table 9. Replacement Element Assembly Part Numbers (Group IIA Models)
Housing Carbon Steel 304 Stainless Steel Carbon Steel 316 Stainless Steel
Models EN-FVFA-0401, EN-FVFA-0401.5 and EN-FVFA-0402 7134101 7134301 7134201 7134401
Models EN-FVFA-0802, EN-FVFA-0803 and EN-FVFA-0804 7134103 7134303 7134203 7134403
Flame Cells 304 Stainless Steel 304 Stainless Steel 316 Stainless Steel 316 Stainless Steel
Model EN-FVFA-0603 7134102 7134302 7134202 7134402
Model EN-FVFA-1206 7134105 7134305 7134205 7134405
Model EN-FVFA-1608 7131107 7133707 7133607 7133807
Model EN-FVFA-2010 7131109 7133709 7133609 7133809
Model EN-FVFA-2412 7131111 7133711 7133611 7133811
Table 10. Replacement Element Assembly Part Numbers (Group IIB3 Models)
Housing Carbon Steel 304L Stainless Steel Carbon Steel 316L Stainless Steel
Models EN-FVFA-0401, EN-FVFA-0401.5 and EN-FVFA-0402 7131101 7133701 7133601 7133801
Models EN-FVFA-0802, EN-FVFA-0803 and EN-FVFA-0804 7128803 7131503 7130903 7131603
Flame Cells 304 Stainless Steel 304 Stainless Steel 316 Stainless Steel 316 Stainless Steel
Model EN-FVFA-0603 7128802 7131502 7130902 7131602
Model EN-FVFA-1206 7128805 7131505 7130905 7131605
Model EN-FVFA-1608 7128807 7131507 7130907 7131607
Model EN-FVFA-2010 7128809 7131509 7130909 7131609
Model EN-FVFA-2412 7128811 7131511 7130911 7131611
(1)
PART NUMBER
PART NUMBER
PART NUMBER
High Temperature Gasket
(Graphite Coated 316 Stainless steel)
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D103771X012 © 2014, 2017 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 09/17.
The Emerson logo is a trademark and service mark of Emerson
Electric Co. All other marks are the property of their prospective owners.
Enardo™ is a mark owned by Regulator Technologies Tulsa, LLC, a
business of Emerson Automation Solutions.
The contents of this publication are presented for informational purposes
only, and while every effort has been made to ensure their accuracy,
they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use
or applicability. We reserve the right to modify or improve the designs or
specications of such products at any time without notice.
Emerson Process Management Regulator Technologies
Tulsa, LLC does not assume responsibility for the selection, use or
maintenance of any product. Responsibility for proper selection, use
and maintenance of any Emerson Process Management Regulator
Technologies Tulsa, LLC product remains solely with the purchaser.
North America Only
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