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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.

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.

Figure 1.

 Typical Enardo Free Vent Flame Arrestor

Instruction Manual

D103771X012
September 2017

Free Vent Flame Arrestor

North America 

Only

Summary of Contents for Enardo EN Series

Page 1: ...formed 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 Introduction Scope of the Manual This Instruction Manual provides instructions for installation startup maintenance and parts ordering information for the Enardo Free Vent Flame Arre...

Page 2: ...telloy EN Number European Standard EN ISO 16852 1 The pressure temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded Figure 2 Free Vent Flame Arrestor Available Constructions and Model Numbering System EN FVFA Housing Size Connection Size IEC Gas Group Housing Material Element Material Connection Type Options 04 4 inches through 24 24 i...

Page 3: ...r 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 ...

Page 4: ... Table For best results hardened steel washers should be used on all cast flange bolted connections NOMINAL PIPE DIAMETER NUMBER OF BOLTS BOLT DIAMETER TORQUE In mm Ft lbs N m 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 4...

Page 5: ...ice 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 an...

Page 6: ...ug 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 Table 6 Tightening Steps and Torque Values 1 Figure 5 Flange Pattern Tightening Sequence 1 5 9 8 4 3 7 2 6 13 17...

Page 7: ...mber 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 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 Table 7 Torque Cor...

Page 8: ...603 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 Free Vent Flame Arrestor Facebook com EmersonAutomationSolutions LinkedIn com company emerson automation solutions Twitter com emr_automation Webadmin Regulators emerson com Enardo com D103771...

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