Each manufacturer will have specific recommendations as to pressure settings for use with their products and you will be able to find that information fairly easily...

Having said that, I usually am using an MFA-8 Rosebud made by Victor and basic settings I use are 10 psi Acetylene and 35 psi Oxygen.

With a Rosebud a pound or two difference one way or the other will not be a huge deal because of the amount of gas being used, just stay away from the maximum draw rate for Acetylene. If you have a Rosebud that requires a high volume of Acetylene, go to a manifold system and draw off several bottles.

Specific to your question, I set the pressures for the attachment I am using, NOT what I am using it for. I use torch manipulation and distance to the material to control the heat input.

Hope it helps.

Your mileage may vary.

 

Each manufacturer will have specific recommendations as to pressure settings for use with their products and you will be able to find that information fairly easily...

Having said that, I usually am using an MFA-8 rosebud made by Victor and basic settings I use are 10 psi acetylene and 35 psi oxygen.

With a rosebud a pound or two difference one way or the other will not be a huge deal because of the amount of gas being used. Just stay away from the maximum draw rate for acetylene. If you have a rosebud that requires a high volume of acetylene, go to a manifold.

Black Wolf is correct. You set the gauge pressures for the tip, not for the work.

This from an actual Victor MFA-8 tip chart:

No. 8
fuel: 10-15 psi (30-80 cfh)
oxygen: 20-30 psi (33-88 cfh)

metalmagpie

 

#10 Rosebud basics --- Largest acetylene cylinder available or manifold two together (standing upright). full flow regulators. Minimum of 1/4" diameter twin hose from regulator to torch. Flash back arrestors @ torch. Acetylene at 15 PSI, oxygen at 40 psi.......

Stand back ! !

 

The settings for a rose bud tip should be equal. I set my #10 rose bud on 10 pounds on both the acetylene and the oxygen.

 

Ummm... No.

If that is what you are doing, you are out of specs for the tip with BOTH gases.

Look at the chart below from the manufacturer - In this case Victor. Look at the recommended settings from the guys that build and design it. I am aware that I am a tad high on the Oxygen pressure for the MFA-8 but I said it was a BASIC setting. It is just what I use.

 

Here is the link to page I took the snapshot from:

http://victortechnologies.com/IM_Up...ploads/DocLib_5222_Victor Professional Welding and Heating Nozzles and Tips.pdf

 

And if you're worried about the withdrawal issue with acetylene, get a propane rosebud.

 

When the tip overheats (you'll know ), dip it into a bucket of water and you're good to go again.

 

kctgb - To clearify all the advice, jump into a book or research the WEB; the data
for your question is easily referenced. In application [the life of the bottle] acetylene
is delivered in an ever decreasing rate, roughly 1/7th its desolved volume. If the
flame 'pops out' or 'pops like a machine gun' it means fuel starvation. If you have a
full bottle, you dial up the acet. delivery and balance the Ox pressure; if you have a
partial bottle you max. the Acet. pressure and dial down the Ox. to match the Acet.
flow rate untill it stops popping. Once you have gotten to this stage, then you can
dial in a carbonizing, neutral, or oxidizing flame per application. Opus