1、. Manufacturing Standards Ford Motor Company B BGX PAINT CURING AND MOISTURE DRYING OVENS I. Introduction 1.0 SCOPE 2.0 DEFINITIONS 3.0 GENERAL 4.0 SAFETY DESIGN DATA FORM FOR SOLVENT ATMOSPHERE OVENS II. Oven Construction C Design 5.0 LOCATION 6.0 CONSTRUCTION 6.1 Side Walls 6 Roof 6.2 Floors 6.3 S
2、tructural Supports 6.4 Access Doors 6.5 Explosion Vents 6.6 Static Electricity 7.0 SOURCE OF REAT 8.0 OVEN HEATING SYSTEMS 8.1 General 8.2 Zone8 8.3 Heaters 8.4 Combustible Material8 8.5 Catalytic Burners 8.6 Gas and Electric Meters 9.0 STACKS 10.0 AIR SEALS 10.1 General 10.2 Dimensions 10.3 Duct Sy
3、stem 10.4 Fans 10.5 Filters 11.0 DUCTWORR 11.1 General 11.2 Interior Duct8 and Nozzles 11.3 Exterior Ducts 12.0 INSULATION 13.0 VENTILATION 13.1 Fan8 13.2 Performance Data 13.3 Safety Ventilation 14.0 ELECTRICAL 14.1 JIC Electrical Standards 14.2 Control8 14.3 Lighting 14.4 Power Manufacturing Staff
4、 JU 1980 PAINTCURING AND MOISTURE DRYING OVENS .* This document has been reproduced from the best hardcopy available * BGX P8ge 1 B macturing Standards hd Motor Company BGX PAINT CURING AND HOIktJRE DRYING O#JS 15.0 PLATFORMS AND LADeERS 16.0 SAFETY AND UAINTRNANCE, 16.1 Noise 16.2 Fire Protection 1
5、6.3 Filters 16.4 Painting, 16.5 Lubrication . 16.6 Cleaning- *a . 16.7 Stock Handling 16.8 Coruprcrscd Air : - 16.9 Acceptance Tcrting 1 . 16.10 Factory Insurance Carrier Approvals . 17.0 OUTDOOR OVENS . . 17.1 Conrtruction . . - 17.2 Framing 9 I * 17.3 Panels 17.4 Air Seals l - * . a. 17.5 Heater H
6、ouses: . 17.6 Control and Becordizrg Inet 17.13 Electrical 17.14 Painting :* .-. *. 17.15 Weather Covering :. I._. , i * ,! fj+- t.- .- III. Appendix a *. c -3 Y l cc - 18.0 REFERENCE SKETCHES .L Fig. 1 Imulated Oven Panel . . . : Fig. 2 Typical Air Sea16 * * Fig. 3 Oven Builder “Safe.Form 13 . . w
7、1 -.L i I3 .-I -?. 5 , l . - : ,. . Characteristics of Plant Service8 available at the prOpO8td oven loca- tion, such as voltage, phase, and frequency of electric power, kind of fuel, heat content, pressure in gas, steam, water and compressed air distributing mains, etc. (k) Maximum quantity of flam
8、mable volatiles introduced into the oven, ex- pressed in gallons (liters) per minute for continuous ovens and in gallons (liters) per batch for batch ovens. (1) The auto-ignition temperature of the msrterial to be dried or baked, and the closed cup flash point of the volatile fo be evaporated. 3.2 A
9、ll provisions of Industrial Equipment Standards No. BXl “General Condi- tions ,” Shall apply. 3.3 All sheet metal gauges referred to throughout these Standard8 Shall be under- * stood to be U.S. Standard. 4.0 SAFETY DESIGN DATA FORM FOR SOLVENT ATMOSPHERE OVENS 4.1 A suitable, clearly worded and pro
10、minently displayed oven safety design data form or manufacturers nameplate Shall be provided by the builder of each oven stating the safe operating conditions for which the oven was designed and built as stated in NFPA-86A. Refer to sample form in Appendix Sec- tion 18. 5.0 LOCATION 5.1 In general,
11、ovens should not be located in closely confined or restricted places. They should be located at or above floor level. 5.2 Building columns, girders, trusses and beams shall not pass through an oven structure (exceptions must comply with NFPA 86A). 5.3 Ovens shall be well separated, from valuable sto
12、ck, important power equip- ment , machinery and sprinkler risers. 5.4 Ovens shall not adjoin lockers, lunch rooms, nor obstruct passage to exits. 5.5 Heaters shall be located so that vapors from spraying, flow coating, dipping areas and storage and mixing rooms cannot flow by gravity to them. The fl
13、ow of ventilating air from paint rooms, or other places where fla888able vapors art released, shall be away from the oven or heater. BGX Page I( cn3mu.u PAINTCURING MD MOISTURE DRYING OVENS Manufacturing Staff July 1983 % G!?a Manufacturing Standards Ford Motor Company BGX PAINT CUBING AND MOISTURE
14、DRYING OVENS 5.6 Batches, doors or loose psncls uacd as explosion vents shsll be so located that in the event of sn explosion the vent covers vi11 not dsmsgc pipe lines, conduit, sprinkler lines, or other vital iastsllstioas, or eadsager person- nel. 6.0 CONSTRUCTION Continuous Indoor Ovens (Outdoor
15、 ovens to conform to additional requirements des- cribed in Section 17 of this Stsndsrd) shall be tunnel type with silhouetted sir seals at .the entrance and exit ends. Construction shall be in conformance vith staadsrds set forth by the NFPA-#86A, Ford Motor Compsny Standard BHSX-2, data form 2634,
16、 sad reference sketches Section 18. (Asbestos shall not be used.) 6.1 Oven Side Walls snd Roofs 6.1.1 Oven side vslls sad roofs shsll be constructed of insulated inter- locking (except explosion vents) sheet metsl panels 6“ (152.4 m) thick (minimum) sad 30“ (762.6 laar) wide (w52 m) high (miaimum).
17、6.4.2 An explosion relief access door shall be installed in the heater houaiag directly downstream of the burner. If aa access door is located upatreun of the burner, it shall also be an l xplosioa relief type. 6.5 Explosion Vents 6.5.1 All oveaa containing flaaaaable air-gas mixtures shall be provi
18、ded with unobstructed veata for freely relieving internal explosion prea- lures. The explosion relief ratio should be 1 square foot of relief area to 15 cubic feet of oven volume. The metric equivalent is 1 square meter of relief area to 4.57 cubic meters of ovea volume. The areas of penaaneat openi
19、ngs and access openings provided with doors having approved explosion latches, as described in Section 6.4.1, can be considered as relief venting area. 6.5.2 Guards shall be installed in front of doors where necessary, to pre- vent obatructioa by stock or portable equipment. 6.5.3 Sidewall panels he
20、ld in place by friction clips mry be used as explo- sion relief vents. These paaela shall have strength, rigidity, and insulating value equal to the requiremcnta of Sections 6.1.1 and 6.1.2 of this Staadard, and shall be reattained by barriers from more than 2 ft. (0.6 ml movement for personnel prot
21、ection. 6.5.4 If all panels are permanently faateaed, loose or hinged explosion hatches of the area specified in Section 6.5.1 shall be provided in the roof of the oven. Hatches shall be of light construction, readily breakable as described in NFPA 86A. Manufacturing Staff July 1980 -mm In UsA PAINY
22、 CUBING AND MOISlDRE DRYING OVENS BGX Page 7 B Manufacturing Standards Ford Motor Company BGX PAINT CURING AND MOISTURE DRYING OVENS 6.6 Static Electricity 6.6.1 The metal frames of ovens shall be electrically grounded throughout for the safe removal of static electric charges. 7.0 SOURCE OF HEAT 7.
23、1 Types of heat sources shall be as follows: (a) Fuel gas (aianufactured gas, natural gas, propane, butane) burned in external direct or indirect fired heacera. (b) Electrical infrared radiating sources within the oven chamber. (cl Electrical resistance elements installed in the oven chamber or cir-
24、 culating ducts. (d) Fuel oil burned in external indirect fired heaters. (e) Circulating mediums - steam, water, oil or other liquids. (f) Combinations of the above. 7.2 The above sequence shall be considered the order of Ford Motor Company preference unless fuel availability dictates otherwise. 8.0
25、 OVEN HEATING SYSTEMS 8.1 General 8.1 .l For the purpose of this Standard the term “Oven Heating Systems” shall include the heating source, (such as gas and oil burners, infrared radiators, steam radiating systems and associated housings) circula- ting fans and ducts to convey heat to the oven. 8.2
26、Zones 8.2.1 Oven ckall be divided into heating zones equipped with approved direc: gas-fired combustion units unless otherwise specified. Maxi- mum ailowable zone length shall be 80 ft. (24.2 m). 8.3 Heaters 8.3.1 The heaters shall be circular shell, pull-through type, with air and heat mixing baffl
27、es and dampers; with recirculating fan, heater, fil- ter box, prepiped gas train, and burner completely built-up into an integral unit. Units will be provided with catalyst or provision for future addition of catalyst as directed by issuing Division. Units will be similar in design to the Cladd Indu
28、stries, type PBWG, “MFCGO,” NCG or Ford approved equal. BGX Page 8 cwwm L) U.S PAINT CURING AND MOISTURE DRYING OVENS Manufacturing Staff July 1900 Manufacturing Standards Ford Motor Company . BGX PAINT CURING AND MOISTURE DRYING OVENS 8.3.2 Heater fans shall be Class III as described in heater pack
29、age, unless stated otherwise in detailed equipment specification. 8.3.3 All make-up and combustion air shall be filtered and necessary dampers and blast gates shall be provided to control same. 8.3.4 Fuel shall be natural gas witf heat content of approximately 1,000 BTU per cubic foot (37,259 W/m )
30、and supply pressure of approximately 15 PSIG (103 kPa), ualeas otherwise specified. (Refer to 7.1 aad 7.2) 8.3.5 Heater capacity shall be 10% greater than actual design requirements for the specified operatiag temperatures and circulated air volumes. 8.3.6 Thermal head of 150 F (66 C) shall be uaed
31、for ovens, such as prime paint* moisture dry-off, flo-coat and E-coat. Thenaal head of 100 F (37.7 Cl, unless specified othervise, shall be limited to enamel ovens of 300 F (149 C) or leas. 8.3.7 Heater capacity shall be baaed on fully-loaded aad running conveyors (live load), radiation and exhaust
32、load. 8.3.8 Beaters for the last zone of a larltiple zone ovea shall be aired for l,OOO,OOO BTU/hr (1,054,800 k.7) minimum. 8.3.9 Gas vent piping shall be installed as per NFPA 86A and Ford Motor Company Standard BH5X-2. Reatera shall be individually veated. 8.3.10 The source of heat my be located e
33、ither inside or outside the oven. External or remote fuel fired heaters may be: (a) Direct, where products of combustion enter the oven, and contact the work in process, or (b) Indirect, where combustion products do not mix with recirculated air and do not contact the work in process. 8.3.11 Beat ma
34、y be transferred to the work in process by radiation, convec- tion or a combination of both. 8.3.12 Fuel fired heaters, classified in Section 8.3.10(a) as direct, may be used in moat paint drying applications, all water dry-off ovens, and other ovens where the products of combustion have ao adverse
35、effect upon materials being proceaaed. Otherwise, indirect heaters dea- cribed in Section 8.3.10(b) shall be used. 8.3.13 Ceramic tipped gas and oil burners shall not be used as components of direct fired oven heaters. Manufacturitig Staff Jul3r 1980 -U.S. air velocities through ducts, oven supply n
36、ozzles, air seal. openings, burner air make-up, etc. A certified faa curve with the point of operation indicated must be submitted for each fan, regardless of application. 13.2.1 All fan and air performance data , including multi-point metal tem- perature oven chart shall be tabulated by the vendor
37、on Ford Motor Company furnished forms (see Appendix, Section 18). The completed forms shall be submitted to the issuing Division before final approval is granted. Manufacturing Staff July 1980 c*nw II U.S.A. PAINT CURING AND MOISTURE DRYING OVENS BGX Page 17 B Manufacturing Standards Ford Motor Comp
38、any BGX PAINT CURING AND MOISTURE DRYING OVENS 13.3 Safety Ventilation For all new ovens, in which flammable or toxic vapors are liberated, the following minimum amounts of safety ventilation shall be provided: 13.3.1 Batch Ovens 380 CFM (referred to 70F) (646 m3/hr at 21C, per liter! of fresh air f
39、or each gallon of flammable volatile8 and/or water on the largest foreseeable workload. 13.3.2 Continuous Ovens 10,000 cubic feet (referred to 70F) (75m3 at 21C, per liter) of fresh air for each gallon of flannnable volatiles and/or water entcr- ing the oven on work, conveyor and on the work carrier
40、s. 13.3.3 Air volumes for Batch and Continuous Ovens specified as above, shall apply for oven temperatures up to 250F (12OC). For temperatures from 250F (120C) to 500F (26OC) for Batch Ovens only increase the volume by a multiplier of 1.4. 13.3.4 The exhaust fan and motor shall have a capacity to ex
41、haust the minimum air volume calculated in Section 13.3, with dampers (see 11.3.4.) in the closed position in both the fresh air intake and the exhaust ducts. 13.3.4.1 Safety ventilation required by Section 13.3 shall be pro- vided by a separate yhauster in existing ovens of over 64 cubic feet (1.81
42、 m 1 internal volume, where flammable solvents are evaporated from dipped metal parts, electric coils, armatures and stators, and absorbent materials which carry large amount of flammable liquid relative to their dry weights. 13.3.4.2 For batch ovens under 64 cubic feet (1.81 m) internal volume refe
43、r to NFPA-86A for safety ventilation. 13.3.4.3 Exhaust fans and recirculating air seal fans shall be centrifugal, single width, backward-curved blade, non- overloading, class 2, arrangement 1, equipped with heat slinger, ly (38 mm) drain coupling and gasketed clean- out door. 13.3.5 Moisture oven ex
44、haust fan capacities shall be based on 1 air change per minute for a 5 minute dry off cycle, and 1 air change per 2 minutes for a 10 minute dry off cycle. BGX Page 18 ,rm,a m Y.S.4 PAINT CURING AND MOISTURE DRYING OVENS Manufacturing Stall July 1980 Manufacturing Standards Ford Motor Company B 14.0
45、ELECTRICAL BGX PAINT CURING AND MOISTURE DRXING OVENS 13.3.6 Minimum circulation requirements for multiple zone moisture drying and paint bake ovens are as follows: AIR CHANGES SCFM BODY SHEET METAL PARTS Zone Paint Moisture Drying Paint Moisture Drying If 4 1 2+ 24 14 2 2 2 3 2 2% 3 2 2% 1)5 2 4 2
46、2* 14 2 5 2 24 14 2 *Rocker panel discharge. 13.3.7 Energy requirements may be reduced, at the option of the issuing division, by providing safety ventilation with a separate filtered, dampered supply fan and ductwork in conjunction with a separate dampered exhaust fan and ductwork for purging and r
47、apid cool down of the oven during production shutdowns. 14.1 The provisions of JIG Electrical Standards as published by the Ford Motor Company, Industrial Equipment Standard No. BH5X-2, “Electrical General,” and NFPA-70 shall apply. 14.2 A temperature recording and control instrument shall be provid
48、ed for each zdne of the oven. The instrument shall be located in the center of each zone and shall be mounted on the side of the oven at eye level (approximately 5 (1.52 m above floor line). The instrument control bulb shall be suspended in the center of the zone by suitable brackets at a point 6” (
49、152.4 am11 below a recirculation direct return opening. 14.2.1 The recording and control instrument shall be pneumatic operating, automatic reset, full proportioning with thermocouple sensing system, Foxboro, Honeywell, or Ford Motor Company approved equal. 14.2.2 A multi-point temperature recorder shall be located in the oven “Motor Control Center” (M.C.C.). Iron-Constantan (Type K) thermo- couple assemblies, vith exposed measuring junctionl shall be posi- tioned adjacent to the control instrument sensing bulb in each zone. Protection t
