SpudFiles Wiki:Community Portal - Revision history

DYI: /* '''ABS''' */

2008-07-23T15:05:53Z

'''ABS'''

← Older revision		Revision as of 10:05, 23 July 2008
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	'''Cons:'''		'''Cons:'''

	1) Rarely pressure rated. Pressure rated ABS is very difficult to acquire, and likely more expensive than just using steel pipe. However, solid wall SCH 40 DWV ABS makes an excellent material for barrels of pneumatics (it can repeatedly survive short spikes of several ~~times its burst pressure~~) and combustion chambers for advanced propane combustions as well as oxygen enriched combustions. Cellular core ABS, while rare, should be avoided at all costs.		1) Rarely pressure rated. Pressure rated ABS is very difficult to acquire, and likely more expensive than just using steel pipe. However, solid wall SCH 40 DWV ABS makes an excellent material for barrels of pneumatics (it can repeatedly survive short spikes of several hundred psi) and combustion chambers for advanced propane combustions as well as oxygen enriched combustions. Cellular core ABS, while rare, should be avoided at all costs.

	2) It's still plastic. Threaded joints with metal are dicey, and tapped threads will always weaken the pipe, by a factor of 4 or more.		2) It's still plastic. Threaded joints with metal are dicey, and tapped threads will always weaken the pipe, by a factor of 4 or more. Use in high powered hybrids (this effect has been observed with 20x oxy/propane and higher mixes), where the combustion products are denser and have more heat capacity, can literally flash boil the pipe if it is used as a barrel, causing extreme deformation and usually destruction of even heavily reinforced designs. Bottom line - thick plastic is no substitute for metal in a hybrid, even if it has the same pressure capacity.

	3) Decomposition products are nasty! If you have ever taken a whiff after firing it a few times, you will get a burning in your nose. This caustic gas is not good for you! Burning ABS produces a type of cyanide gas which is incredibly deadly (obviously).		3) Decomposition products are nasty! If you have ever taken a whiff after firing it a few times, you will get a burning in your nose. This caustic gas is not good for you! Burning ABS produces a type of cyanide gas which is incredibly deadly (obviously).

DYI: /* '''PVC''' */

2008-02-01T15:18:50Z

'''PVC'''

← Older revision		Revision as of 10:18, 1 February 2008
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	2) Multitude of dimensions to chose from. Pretty much any configuration of pipe fitting can be found somewhere in PVC, but get out your checkbook! 6" sch 80 will run you right around $40 for a 10' piece.		2) Multitude of dimensions to chose from. Pretty much any configuration of pipe fitting can be found somewhere in PVC, but get out your checkbook! 6" sch 80 will run you right around $40 for a 10' piece.

	3) Pressure ~~Rated~~. What you see is what you get. The rated pressure on the side of the pipe is already conservative, so you don't need to incorporate safety factors, unless you want to. Fittings are always stronger than bulk pipe, as long as the glue joints are made and allowed to cure properly and are Schedule 40.		3) Pressure rated variety is easier to find than the ABS equivalent. What you see is what you get. The rated pressure on the side of the pipe is already conservative, so you don't need to incorporate safety factors, unless you want to. Fittings are always stronger than bulk pipe, as long as the glue joints are made and allowed to cure properly and are Schedule 40.

	'''Cons:'''		'''Cons:'''

DYI: /* '''ABS''' */

2008-02-01T15:17:24Z

'''ABS'''

← Older revision		Revision as of 10:17, 1 February 2008
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	2) Light weight, even the weakest of us has no reason to heft and bear these devices.		2) Light weight, even the weakest of us has no reason to heft and bear these devices.

	3) Low cost, it can be obtained almost anywhere, in the correct dimensions.		3) Low cost, it can be obtained almost anywhere, in the correct
			dimensions.

			4) High impact resistance. Pressurised ABS chambers can be dropped with no ill effects, hit with a hammer without damage, and used with faster burning fuel/oxidiser combinations than PVC.

			5) Favourable failure characteristics; except at low temperatures, ABS will not shatter on failure like PVC, and will instead simply rip open, or tear in half in some cases if things like gauges or meters have been tapped through its walls.

	'''Cons:'''		'''Cons:'''

	1) ~~NOT PRESSURE RATED! This material has been proven to be acceptable, but standard pipe is not certified for any~~ pressure ~~service above those found in gravity drain applications, typically not above 10 psi~~. ~~The term "cellular core" means that millions of tiny air bubbles were whipped into the plastic before it was run through the extruder. The end result~~ is a very ~~light weight material that in effect is nothing~~ more than ~~a piece~~ of ~~hard foam in the shape~~ of ~~a tube~~. ~~This hard foam can~~ be ~~strong but inevitably an unfortunate configuration of bubbles can cause catastrophic failure~~.		1) Rarely pressure rated. Pressure rated ABS is very difficult to acquire, and likely more expensive than just using steel pipe. However, solid wall SCH 40 DWV ABS makes an excellent material for barrels of pneumatics (it can repeatedly survive short spikes of several times its burst pressure) and combustion chambers for advanced propane combustions as well as oxygen enriched combustions. Cellular core ABS, while rare, should be avoided at all costs.

	2) ~~If it fails~~, it will ~~fail. When it goes~~, ~~it will turn into many little shards~~ of ~~sharp plastic that will invariably find you in some way~~.		2) It's still plastic. Threaded joints with metal are dicey, and tapped threads will always weaken the pipe, by a factor of 4 or more.

	3) Decomposition products are nasty! If you have ever taken a whiff after firing it a few times, you will get a burning in your nose. This caustic gas is not good for you!		3) Decomposition products are nasty! If you have ever taken a whiff after firing it a few times, you will get a burning in your nose. This caustic gas is not good for you! Burning ABS produces a type of cyanide gas which is incredibly deadly (obviously).

	== '''PVC''' ==		== '''PVC''' ==

BillyBobJoe: /* '''PVC''' */

2007-01-31T23:10:43Z

'''PVC'''

← Older revision		Revision as of 18:10, 31 January 2007
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	'''Pros:'''		'''Pros:'''

			1 )Inexpensive, the pipe is almost free. Fittings are where the money is dropped, but well worth it

	1)~~Inexpensive, the~~ pipe ~~is almost free. Fittings are where the money is dropped~~, but ~~well worth it~~		2) Multitude of dimensions to chose from. Pretty much any configuration of pipe fitting can be found somewhere in PVC, but get out your checkbook! 6" sch 80 will run you right around $40 for a 10' piece.

	2)Multitude of dimensions to chose from. Pretty much any configuration of pipe fitting can be found somewhere in PVC, but get out your checkbook! 6" sch 80 will run you right around $40 for a 10' piece.		3) Pressure Rated. What you see is what you get. The rated pressure on the side of the pipe is already conservative, so you don't need to incorporate safety factors, unless you want to. Fittings are always stronger than bulk pipe, as long as the glue joints are made and allowed to cure properly and are Schedule 40.

	3)Pressure Rated. What you see is what you get. The rated pressure on the side of the pipe is already conservative, so you don't need to incorporate safety factors, unless you want to. Fittings are always stronger than bulk pipe, as long as the glue joints are made and allowed to cure properly and are Schedule 40.

	'''Cons:'''		'''Cons:'''

BillyBobJoe: /* '''PVC''' */

2007-01-31T23:10:18Z

'''PVC'''

← Older revision		Revision as of 18:10, 31 January 2007
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	'''Cons:'''		'''Cons:'''

	1)Limited Chemical Resistance. Aldehydes and ketones are out, as these readily dissolve the polymer, as in a glue joint, just read the label on the can: Acetone, THF, MEK. Some fuels should be totally avoided such as carb cleaner and insect repellant~~, don't say I didn't warn you!~~		1) Limited Chemical Resistance. Aldehydes and ketones are out, as these readily dissolve the polymer, as in a glue joint, just read the label on the can: Acetone, THF, MEK. Some fuels should be totally avoided such as carb cleaner and insect repellant as they decompose ABS.

	2)More brittle than ABS, but by not using oxygen and just burning fuel and air....should never be a problem.		2) More brittle than ABS, but by not using oxygen and just burning fuel and air....should never be a problem.

	3)Cellular core PVC is common at many hardware/home improvement stores. Make sure you buy SCH 40 pipe with a pressure rating printed on the pipe. If the pipe is not specifically marked with a certain PSI rating, IT IS NOT PRESSURE RATED!!		3) Cellular core PVC is common at many hardware/home improvement stores. Make sure you buy SCH 40 pipe with a pressure rating printed on the pipe. If the pipe is not specifically marked with a certain PSI rating (ie, 330 PSI, depending on diameter), IT IS NOT PRESSURE RATED!!

	[[''Source taken from www.spudtech.com'']]		[[''Source taken from www.spudtech.com'']]

BillyBobJoe: /* '''ABS''' */

2007-01-31T23:08:17Z

'''ABS'''

← Older revision		Revision as of 18:08, 31 January 2007
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	'''Pros :'''		'''Pros :'''

	1)Chemical resistance, so can stand up to the average weekender going crazy experimenting with every different thing that can be found in an aerosol can.		1) Chemical resistance, so can stand up to the average weekender going crazy experimenting with every different thing that can be found in an aerosol can.

	2)Light weight, even the weakest of us has no reason to heft and bear these devices.		2) Light weight, even the weakest of us has no reason to heft and bear these devices.

	3)Low cost, it can be obtained almost anywhere, in the correct dimensions.		3) Low cost, it can be obtained almost anywhere, in the correct dimensions.

	'''Cons:'''		'''Cons:'''

	1)NOT PRESSURE RATED! This material has been proven to be acceptable, but standard pipe is not certified for any pressure service above those found in gravity drain applications, typically not above 10 psi. The term "cellular core" means that millions of tiny air bubbles were whipped into the plastic before it was run through the extruder. The end result is a very light weight material that in effect is nothing more than a piece of hard foam in the shape of a tube.		1) NOT PRESSURE RATED! This material has been proven to be acceptable, but standard pipe is not certified for any pressure service above those found in gravity drain applications, typically not above 10 psi. The term "cellular core" means that millions of tiny air bubbles were whipped into the plastic before it was run through the extruder. The end result is a very light weight material that in effect is nothing more than a piece of hard foam in the shape of a tube. This hard foam can be strong but inevitably an unfortunate configuration of bubbles can cause catastrophic failure.

	2)If it fails, it will fail. When it goes, it will turn into many little shards of sharp plastic that will invariably find you in some way.		2) If it fails, it will fail. When it goes, it will turn into many little shards of sharp plastic that will invariably find you in some way.

	~~3)Decomposition products are nasty! If you have ever taken a whiff after firing it a few times, you will get a burning in your nose. This caustic gas is not good for you!~~

			3) Decomposition products are nasty! If you have ever taken a whiff after firing it a few times, you will get a burning in your nose. This caustic gas is not good for you!

	== '''PVC''' ==		== '''PVC''' ==

MrCrowley: ABS vs PVC Pros and Cons

2007-01-25T06:09:52Z

ABS vs PVC Pros and Cons

@@ Line 1: / Line 1: @@
-Someone should add a page that outlines the combustion cannon ABS Vs. PVC debate.
+== '''ABS''' ==
-it should outline the pros and cons of each choice... maybe include a chart...
 THIS IS UNACCEPTABLE!!
 http://www.spudfiles.com/spud_wiki/index.php?title=Special:Deadendpages
 Look at the number of dead end pages! Not Cool!

Benstern at 03:35, 3 January 2007

2007-01-03T03:35:00Z

← Older revision		Revision as of 22:35, 2 January 2007
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	Someone should add a page that outlines the combustion cannon ABS Vs. PVC debate.		Someone should add a page that outlines the combustion cannon ABS Vs. PVC debate.
	it should outline the pros and cons of each choice... maybe include a chart...		it should outline the pros and cons of each choice... maybe include a chart...

			THIS IS UNACCEPTABLE!!
			http://www.spudfiles.com/spud_wiki/index.php?title=Special:Deadendpages
			Look at the number of dead end pages! Not Cool!

Benstern at 03:17, 3 January 2007

2007-01-03T03:17:20Z

New page

Someone should add a page that outlines the combustion cannon ABS Vs. PVC debate.
it should outline the pros and cons of each choice... maybe include a chart...