1、CGA 3.4-1973(reaffirmed 2015)Industrial and Commercial Gas-Fired Conversion BurnersLegal Notice for StandardsCanadian Standards Association (operating as “CSA Group”) develops standards through a consensus standards development process approved by the Standards Council of Canada. This process brings
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16、king a significanc end timely contribution to ti. r.aticna1 interest. Those who have a need to a-,Fly standards are encouraged to use National Standards of Canada whenever practicable. These standards are subject to periodic review; therefore, users are cautioned to obtain the latest edition from th
17、e organization preparing the stanE.ard. xat ional Standards Of Cmaaa are Standards Council cf Canada 300 Sparks Street Ottawa, Ontario K1R 7S3 * Registered ucder the Canadian Trade Narks Act. CONTENTS Pane List of IGAC Members . iii . List of CGA Standards Committee Members . Vi Introduction viti St
18、andards of Reference ix Section I .-. 1.1 Scope 1 Section 11 Part A Construction Requirements Burners with Inpuis in Excess of 400. 000 BTUH and up to 10.000. 000 BTUH maximum 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.10.2 2.10.3 2 .LO . 3.1 2 0.3.2 2.10.3.3 2.10.3.4 2.10.3.5 2.10.3.6 2.10.4 2.10.5
19、 2.10.6 2.10.7 2.10.8 2.11 2.11.2 2.11.3 2.11.4 2.11.5 2.12 2.13 2.14 2.15 General . 2 Nameplate Marking . 5 ?lain Burner . 6 Flame Safeguard Devices . 7 Pilots 8 Electric Ignition Systems . 10 Piping and F itt ings . 13 Air Control . 13 Induced Draft . 15 Valve Trains for Low Pressure Gas . 16 Main
20、 Burner Gas Pressure Regulator 16 Main Surner Valve Functions . 16 Automatic Slow-Opening Valve Function . 16 Safeis Shut-Off Valve Function 17 Automatic Input Control Valve Function 17 Manual Input Control Valve Function . 18 Burner Start-up . 17 Main Bvrner Second Automatic Safety Shut-Off Valve F
21、unction 18 Main Burner Test Firing Valve . 19 Pilot Shut-Off Valve Manually Operated 19 Pilot Pressure Regulator 20 Pilot Automatic Safety Shut-Off Valve . 20 Manually Operated Pilot Test Valve 20 Valve Trains for Medium and High Pressure Gas 20 Gas Pressure Switches . 21 Low Gas Pressure Safety Cut
22、-Off Switch 21 High Gas Pressure Safety Cut-Off Switch . 21 Test Openings . 22 Bleed. Vent and Relief Lines 22 Electrical Equipment and Wiring . 23 Combination Gas-Oil Fired Conversion Burners . . 23 Main Burner Gas Pressure Regulator 22 i Section 11-Part B Construction Requirements-Additional for B
23、urners with Inputs in excess of 10,000,000 BTUH and up to 50,000,000 BTUH maximum 2.16 General . 25 2.17 25 2.18 Safety Controls . 25 Safety Shut-Off Valves . . Section 111-Performance Requirements 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.10.1 3.10.2 - 3.10.3 General . 26 Combustion 28 Pilots and
24、Automatic Pilots . 28 Temperatures . 30 Combustion Safety Controls 30 -Other Safety Controls . 30 Operating Controls 31 Manifold and Control Assembly Capacity 31 Electrical Tests 31 Direct Electrical Ignition of Main Burner . . . . . 32 Trial For Ignition 32 Trial For Ignition Timing . . . 32 Delaye
25、d Ignition 32 Section IV -Instructions 4.1 Operating Instruction . 33 4.2 Ins tallat ion and Service Instruct ions . . . . . . . . . 34 Section 0 -Definitions . 36 Appendix, Table Maximum Allowable Temperatures for Materials. 37 ii THE IMTERPROVINCIAL GAS ADVISORY COLNCIL MEMBERS Mr. H. A. Lines (Ch
26、airman) Chief Gas Inspector Department of Labour 1150 Rose Street REGINA, Saskatchewan S4R 125 Kr. W. F. DeWolfe Director 17 2.17 .7 .4 2.10.3.5 2.12.4 1-1 2.10.3.3 2 .11.4 M -2.10.3.2 2.10.3.6 12.3 ,11.3 Test Firing Valve Manual Input Automatic Input * tiigh Gas Pressure Safeiy Shut-Oi? Low Gas Pre
27、ssure Re gu la t o r !anual lain Shut-Off Val-le Installed in / 4- Drop Pipe by Installer !see CGA B149) .FIGURE 1 # / TYPICAL VALVING ARRANG:LEXT e FOR - SINGLE BURNER -I I NOTE: Refer to indicated sections for requireaents for individual items. Symbols - refer to CGA 3.0 . 2.1.5 2.1.6 2.1.7 Where
28、tap bolts are used to attach air shutters, manifold supports or other parts which must be removed for normal servicing or replacement, they shall be of rust-resisting materialor if of steel, shall have a rust-resisting coating. Bolts, nuts, screws, except sheet metal screws, and other threaded parts
29、 used in the general assembly shall have threads conforming to the current Standard for Square and Hexagon Bolts and Nuts, Studs and Wrench Openings, CSA B33 .l. All controls and burners shall be accessible for normal servicing and functional adjustment in position, and shall be replaceable during n
30、ormal servicing. Manifold assemblies which permit removal of control (s) intact shall be considered to meet this requirement for servicing. Removal of an access panel or door to provide access to a control compartment shall be considered acceptable. 2.1.7.1 Nothing shall be provided for the purpose
31、of permitting any safety control to be rendered ineffective or allowing firing of burners without the protection of each of the required safety controls. 2.1.8 Heads and nuts of bolts which must be removed to permit the removal of cleanout plates shall not be placed where they will be in contact wit
32、h flue gases, unless of suitable material or suitably protected. 2.1.9 Equipment shall be constructed of materials suitable for the purpose and of sufficient strength and durability to snsure safe and reliable service. 2.1.9.1 Burner parts shall be constructed from materials which are known to be su
33、itable for the service to which they normally will be subjected. Moving parts, such as gears, shafting, couplings, fans, pumps, etc. shall be properly enclosed to prevent personal injury and inter- ference with their operation. 2.1.10 2.1.11 Each unit shall include all the essential components neces
34、sary for its normal function when installed as intended. The various parts of the unit shall be constructed and assembled in a manner to ensure strength, rigidity and dur ab i 1 ity . 2.1.12 ,L 2.1.13 2.1.14 2.2 2.2.1 2.2.2 The units, if disassembled for shipment by the manufacturer, shall be arrang
35、ed in as few sub- assemblies as practicable. Each shall be capable of being incorporated readily into the final assembly threading, welding, or similar tasks by the installer. In the case of two or more subassemblies which must bear a definite relationship to each other for the proper and safe opera
36、tion of the equipment, they shall be arranged, constructed and match-marked to allow and facilitate joining to the unit only in the correct relationship with each other without need for alteration or adjustment; or such subassemblies shall be assembled, tested and shipped from the factory as one ele
37、ment. Provision shall be made to permit the operator to sight the main burner Fgniter(s) (pilot burner or direct electrical igniter(s) and main burner(s) flame(s) at a point adjacent to the burner, during a burner light-off. without requiring alteration, cutting, drilling, *. Sufficient and reasonab
38、le accessibility shall be afforded to all burners, controls, and safety devices for normal operat ion. Nameplate Marking The following information shall appear on each burner: 2.2.1.1 The manufacturers or vendors name and address. 2.2.1.2 Type number or catalogue number or des ignat ion of burner. 2
39、.2.1.3 Model number of burner. 2.2.1.4 Type of fuel for which the equipment is designed, the calorific value of the gas, the minimum and maximum gas inputs, the required designed manifold pressure, and the required inlet pressure or pressure range at the point of supply connection. 2.2.1.5 Overfire
40、draft or range of drafts, (negative pressure) on which minimum and maximum burner ratings are based, OR, overfire positive pressure or range of positive pressures on which minimum and maximum burner inputs have been rated (forced draft and power types of conversion burners .) Total electrical rating
41、 of the burner and its components. -6- 2.2.3 2.2.4 2.2.5 2.2.6 2.2.7 2.3 2.3.1 2.3.2 2.3.3 2.3.4 2.3.5 2.3.6 2.3.7 2.3.8 2.3.9 All markings shall be at locations readily visible after the unit is installed. The markings shall be reasonably permanent; as afforded by a metal nameplate. Individual comp
42、onents not a part of the labelled assembly shall include the manufacturers identification and catalogue designation. A label of the certifying agency shall be applied to each bu, -ner . Refer also to 2.6.4 for capacitor ignition energy systems. Main Burner Bodies of burners shall be of substantial a
43、nd durable con- struction, and the material of the parts of the burner that are intended to be subjected to the heat of the combustion zone, shall have a melting point of above 1450 F. Ports shall be machined or otherwise accurately made. Joinzs, w5en used in the pressure zone or in the blx-ner head
44、 af a burner assembly, shall be gastight and shall not depend for mechanical strength nor primarily for tightness an cezimt or other sealing material except where such joints may be considered part of the port area. Joints shall be securely boltsd, screwed, machined, welded, brazed or of equivalent
45、construct ion. Gauzss shall not be used in burner construction. Bcrners shall be readily removable and shall be constructed so that they are essentially self-locating. They shall not be bolted or locked to their support within the burner compartment unless the supports and burners are removable as a
46、 whole, but shall be secured so that they will not twist, slide or drop out of posicion in normal use. Bolt holes shall not intersect gasways unless adequate provision is made to assure permanent gastightness. Removable burner heads shall fit in the correct position only, and be connected in the hea
47、t zone so that they will rernain in the proper position. Screw type fasteners of the unlockable type are not acceptable Burner assemblies shall be so constructed that the assemblies can be easily removed, cleaned and replaced in the field. Burner parts, when adjustable, shall be provided with suitab
48、le locking devices to prevent accidental displacement. . -7- 2 -3 -10 2.3.11 2.3.12 2.3.13 2.3.14 2.4 2-4.1 The burner and/or subassemblies shall incorporate acceptable provisions for support, adjustment and attaching to the heating plant or to the foundation on which it rests in order that installa
49、tion can be so made as to prevent its twisting, sliding, or dropping out of the correct position. Burners of the “swing type“ shall be provided with reliable means for locking the burner in the firing position and, for automatically lighted burners, to prevent their discharging fuel when in other than the firing position. The temperature attained by components in normal operation should not exceed
