I am trying to understand a certain ASTM standard for Fire Tests of Building Construction and Materials. The points that determine the Time-Temperature Curve for this standard are as follows:
1000F at 5 min.
1300F at 10 min.
1550F at 30 min.
1700F at 1 hr.
1850F at 2 hr.
2000F at 4 hr.
2300F at 8 hr. or over
I guess I'm just stupid... but what does this mean?! I know the definition of a time-temp curve is the thermal analysis curve produced by the plot of time vs. temperature, but does this particular curve mean that, as something (whatever kind of construction material being tested) is exposed to heat, it should reach a temperature of 1000F after 5 min, 1300F after 10 min, 1550F, after 30 min, and so on? Please help me understand this!!! Any helpful information about it would be greatly appriciated.
Oh, and Happy Thanksgiving! :-)
2006-11-23 05:41:52 · 5 answers · asked by litestim 2 in Science & Mathematics ➔ Engineering
When construction has to be fire rated it has to withstand the temperature as shown in your question. For example 30 minute fire rate door should not burn at temp 1550F during the 30 minutes. 4hr rated wall must still be standing even if subjected to constant temperature 200F during 4 hour period. This applies to all following passive protection systems such as firestops, fire doors, wall and floor assemblies, etc., which are used in compartmentalization in buildings and the petrochemical industry in Europe and North America. A fire-resistance rating typically means the duration for which a passive fire protection system can withstand a standard fire endurance test. This can be quantified simply as a measure of time, or it may entail a host of other criteria, involving other evidence of functionality or fitness for purpose but Time Temperature curve is important part of the test.
Happy Thanksgiving to you too.
2006-11-23 06:21:10 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Time Temperature Curve
2016-12-17 03:51:48 · answer #2 · answered by nevius 4 · 0⤊ 0⤋
The time-temperature curve was developed as an approximation as to the temperatures generated by a given fire. It assumes a very rapid rise in temperature early in the fire, with the temperature rise tapering off as the fire progresses.
Construction assemblies, such as walls, are tested in a gas-fired oven. The burning air-gas mixture is carefully controlled so that temperatures on the exposed side of the assembly follow the curve.
A significant feature of this test method is its repeatability. Testing the same assembly again and again would end up with very similar results.
A word of caution though. Passing a 2-hour test does not mean an assembly will stand up at least two hours under certain fire conditions. On the other hand, it might last many more hours under other fire conditions.
The test is simply a standard against which assemblies can be measured.
2006-11-23 15:14:40 · answer #3 · answered by Ed 6 · 0⤊ 0⤋
A Time Temperature curve compares time and temp on a graph. It comes out a curve. Time always goes on the bottom as it is the thing you have no control over. Temp goes on the side. Plot the points and draw a line.
Also, the sides of the graph need to be numbered consecutively, and not with the numbers to be plotted. On the bottom of yours would be half hour steps. On the side would be 500 degree steps.
It just shows how the temp changes over time.
2006-11-23 06:02:36 · answer #4 · answered by science teacher 7 · 1⤊ 0⤋
you search and here?:
http://en.wikipedia.org/wiki/Fire-resistance_rating
http://rdrw1.yahoo.com/click?u=http://www.osti.gov/energycitations/product.biblio.jsp%3Fosti_id%3D6814772&y=043098CD36B5CE97CF&i=482&c=10406&q=02%5ESSHPM%5BL7Kvrz2Kzrozm~kjmz%3F%5Cjmiz6&e=utf-8&r=1&d=wow~F825-en-us&n=CVF4K1MNRLIKBG3H&s=0&t=&m=4565EC18&o=01DBB6DBCBD1B03B13&x=0524D13802ACE22802117BCA54326DF88C
http://en.wikipedia.org/wiki/Passive_fire_protection
http://www.fpl.fs.fed.us/documnts/pdf1996/white96a.pdf
http://en.wikipedia.org/wiki/Viscoelasticity
2006-11-23 05:48:34 · answer #5 · answered by Anonymous · 0⤊ 1⤋