bigger oven time!! / teds fabrication

[Guest]

has anyone dealt with TEDS FABRICATION? i think i need a bigger oven! people asking me to do wheels and handlebars and such and my oven is not big enough. this is still a side buiseness so i'm thinking a 3x3x4 or 4x4x6? need some thoughts from you guys.

[JNZFinishing]

Re: bigger oven time!! / teds fabrication

We have the Ted's Deluxe oven, got it back in Dec. One controller broke since, nothing too big, Ted sent us a new one pretty quick. We also installed a 3rd coil so we can do ceramics better. Nice oven overall for the price.

[Guest]

Re: bigger oven time!! / teds fabrication

When purchasing a new oven, please make sure you have sombination air flow and is up to the new OSHA standards...
http://www.powderbuythepound.com/catalo ... cts_id=425

[wiseguyz]

Re: bigger oven time!! / teds fabrication

KING has good advice as usual, but for those of us who can't afford $10,000 for an oven, Ted builds a good unit for the hobby business that is well built, performs well, and is about 1/3 of the cost of the one in the pics. He is very good to deal with, prompt service, and builds a pretty good product for the money, especially compared to what the average guy could fabricate on his own with the tools found in most home shops. I bought his base 4'x4'x6', added a foot to the height, a 3rd element to compensate for the added space, and a viewing window. Mine has no fan, nor is it vented, but does a great job. At some point I'd love to step up to a UL listed, OSHA approved, high-dollar gun, spray room, and commercial oven, but right now I've got a good setup with minimal investment. Those other things will have to wait until I do this as my ONLY job. If I were doing it full time, I'd definitely go to a unit like PBTP sells.

[Guest]

Re: bigger oven time!! / teds fabrication

Oven Venting Considerations

NFPA 86 specifies oven ventilation requirements for fire protection. NFPA 86 should be reviewed in its entirety.
Some of the NFPA 86 recommendations (air intake basis at 70 degrees f) and other considerations are as follows:

• One ft3/min for every 5700 btu/hr oven capacity rating for removal of byproducts of combustion of natural gas, plus
• 2.2 ft3/min for every pound of powder through the oven for removal of potential volatile compounds, which may be generated in the powder curing operation.
• The workplace environment should be monitored to ensure that the combination of bake oven venting and room air turnover is sufficient to meet Permissible Exposure Limits (PEL) and other exposure limits for regulated substances which may be outlined on the powder MSDS.

[Guest]

Re: bigger oven time!! / teds fabrication

0.1 Safety Ventilation for Class A Ovens.

10.1.1 General Safety Ventilation Requirements.

10.1.1.1 Air circulation shall be used to minimize the volume of flammable concentration regions that are present at the point of evaporation within the oven.

10.1.1.2 Combustible solids or substrate material shall not require safety ventilation unless flammable constituents are evolved in the process of heating.

10.1.1.3 The determination of safety ventilation shall be based on all of the following:

(1) Volume of products of combustion entering the oven heating chamber

(2) Weight or volume of flammable or combustible constituents released during the heating process, based on maximum loading

(3) Solvent that requires the greatest amount of ventilation air per gallon (liter) when a combination of solvents is used

(4) Design of the oven heating and ventilation system with regard to all of the following:

(a) Materials to be processed

(b) Temperature to which processed materials are raised

(c) Method of heating with regard to direct or indirect venting of combustion products vs. alternate use of steam or electrical energy

(d) General design of the oven with regard to continuous or batch-type operation

(e) Type of fuel and chemicals to be used and any by-products generated in the heating chamber

10.1.1.4 On completion of an oven installation, airflow tests shall be conducted on the ventilation systems under the oven operating conditions, with flow control devices at their minimum setting.

10.1.1.5 The airflow tests required by 10.1.1.4 shall be repeated when the flammable or combustible vapor loadings are increased or when modifications are made to the ventilation system.

10.1.1.6 Safety ventilation shall be maintained until all flammable vapors are removed or have been released from the oven and other associated equipment.

10.1.1.7 Class A ovens shall be mechanically ventilated.

10.1.1.8* If reduction of safety ventilation by accumulation of deposits is possible for the oven's intended use, the fan design shall be selected to prevent this accumulation.

10.1.1.9 Class A ovens shall be ventilated directly to outdoor atmosphere or indirectly to outdoor atmosphere through a fume incinerator in accordance with Chapter 9 or through other approved volatile organic compound (VOC) or particulate pollution control devices.

10.1.1.10 Exhaust duct openings shall be located in the areas of greatest concentration of vapors within the oven enclosure.

10.1.1.11* A single fan shall not be used for both recirculation and exhaust.

10.1.1.12 Where used, multiple exhaust fans, manifolded together, shall be designed so that the operation of one or more exhaust fans does not result in backflow to an idle oven or reduced exhaust flow due to increased manifold pressure.

10.1.1.13 Ovens in which the temperature is controlled by varying airflow shall be designed so that the air required for safety ventilation is maintained during all operating conditions.

10.1.1.14 A separate exhaust system shall be used for exhausting the products of combustion from indirect-fired heating systems or indirect-fired internal heating systems, unless otherwise permitted by 10.1.1.15.

10.1.1.15 All indirect fired ovens shall be equipped with one of the following:

(1) Separate exhaust systems for removing the products of combustion and the process stream

(2) A single exhaust system for removing both the products of combustion and the process stream, when the temperature of the products of combustion is reduced by the addition of fresh air to a point where it is insufficient to cause ignition of any combustible fumes in the oven exhaust system and with approval from the AHJ

10.1.1.16* Air supplied into the oven shall be circulated to produce a uniform distribution and movement in all parts of the oven and through the work in process.

10.1.2 Interlocks.

10.1.2.1 Interlocks for exhaust and recirculation fans shall be installed in accordance with Sections 8.5 and 8.6.

10.1.2.2 Electrical interlocks obtained through interconnection with a motor starter shall be provided for exhaust and recirculation fans.

10.1.2.3 Conveyors or sources of flammable or combustible material shall be interlocked to shut down upon the occurrence of excess temperature or if either the exhaust or recirculation system fails.

10.1.3 Heat Recovery and Pollution Control Devices.

10.1.3.1* If the installation of heat recovery devices and pollution control devices reduces the combustion airflow or exhaust flow below that required for purge or safety ventilation, the purge flow rate or purge time shall be increased to compensate for the reduction.

10.1.3.2 Heat recovery devices and pollution control devices shall be designed and maintained to prevent reduction or loss of safety ventilation due to such factors as the condensation of flammable volatiles and foreign materials.

10.1.3.3 Heat recovery devices and pollution control devices shall be designed to minimize fire hazards due to the presence of combustible products or residue.

10.1.4 Fresh Air Supply and Exhaust.

10.1.4.1 Ovens in which flammable vapors are being produced or are combined with the products of combustion shall be exhausted.

10.1.4.2 All ovens shall have the exhaust fan motor starter and airflow switch interlocked to prevent operation of the heating units unless the exhaust fans are running.

10.1.4.3 Devices that control the volume of fresh air admitted to, and the vapors or gases exhausted from, the oven shall be designed so that when at the minimum setting they exceed the volume required for safety ventilation.

10.1.5 Corrections for Temperature and Altitude.

10.1.5.1* Temperature Correction Factor.

(A) Temperature correction factors for volume shall be applied because the volume of gas varies in direct proportion to its absolute temperature.

(B) Volume correction factors shall be determined in accordance with the following relationship or by using Table 10.1.5.1(B):

[wiseguyz]

Re: bigger oven time!! / teds fabrication

I'm not arguing with you about the particulars but if you read that document closely, it specifically refers to a combustion-type (gas-fired) oven. The venting and air circulation requirements for an electric unit would not be the same. Correct me if I'm wrong.

[Guest]

Re: bigger oven time!! / teds fabrication

My Love, this also refers to the combustible nature of powder which is a volatile compound....did you know that in the industrial market cells phones can not be used in a powder room for the same reason ?

[Guest]

Re: bigger oven time!! / teds fabrication

Any powder is combustible this should be kept in mind for any coater. Also, cross contamination is more likely to occur if venting does not exist...

[wiseguyz]

Re: bigger oven time!! / teds fabrication

All good points. Thanks KING. We're all here to learn.

[Guest]

Re: bigger oven time!! / teds fabrication

Not to add fuel to the fire...............hehehehe ok I am done...................but I have had two flash fires in my new oven already, both involved large pieces that we being put in the oven that fell (one I dropped the second was a hook failure) and when they hit the wall/floor and the powder went air born from the jolt the elements ignited the powder....... it was like the old time powder flash stuff they would take pictures with

[Guest]

Re: bigger oven time!! / teds fabrication

All good points. Thanks KING. We're all here to learn.

Am I am here to teach

[Guest]

Re: bigger oven time!! / teds fabrication

Not to add fuel to the fire...............hehehehe ok I am done...................but I have had two flash fires in my new oven already, both involved large pieces that we being put in the oven that fell (one I dropped the second was a hook failure) and when they hit the wall/floor and the powder went air born from the jolt the elements ignited the powder....... it was like the old time powder flash stuff they would take pictures with

You funny man :P

[C3PC]

Re: bigger oven time!! / teds fabrication

....did you know that in the industrial market cells phones can not be used in a powder room for the same reason ?

Yeah and your not to use your cell phone while pumping fuel either...why? A cell phone has been proven to NOT have the ability to start a fire in a fuel /fume rich environment! Even while ringing and/or have its buttons pushed! Instead of blaming the cell phones for the fuel fires lets look at that spark of static from your "fleece" clothes rubbing on that cloth seat. Ok Rant Off.

[Guest]

Re: bigger oven time!! / teds fabrication

Here is another Myth

EXPLODING IMPLANTS

Myth: Silicone breast implants will enlarge and eventually explode at high altitude.

Experts:
Folklorist Heather Joseph-Whitham tells the story of a woman who finds herself becoming uncomfortable during a depressurized local flight, and has her breast implants violently explode on her way to the bathroom mid flight.