Weather Conditions Flashcards
Many Industrial coating projects are done ___ in ___ conditions.
Outside in Ambient Conditions.
The vulnerability of a coating/substrate to weather presents many challenges for owners and contractors. Some of these are:
- Job ___.
- ___ ___ ruined.
- Lost production time from redoing ___ ___.
- ___ when work cannot be done.
- Job delays.
- Surface Prep ruined.
- Lost production time from redoing Surface Prep.
- Seasons when work cannot be done.
___ ___ are available but add cost to the project.
Environmental controls.
It is not uncommon to 1___ a bridge, high-rise tank, or even the deck of an aircraft carrier to complete a coating project in near perfect. 2. ___ ___.
- Enclose.
2. Environmental Conditions.
While enclosures seem to be the optimum answer to bad weather conditions there are drawback.
- Enclosures may ___ against the surface.
- CI’s may need to work in ___ spaces and need to be prepared for that.
- Some enclosures may not have proper ___.
- Enclosures may be tight against the surface.
- CI’s may need to work in hazardous spaces and need to be prepared for that.
- Some enclosures may not have proper lighting.
SSPC Technology Guide No. 1___ states surface prep and coating require a minimum of 2__-___ ___ and recommends __-___ ___.
- 12
2. 20-foot candles and recommends 50-foot candles.
Candles are a measure of?
Light falling on a surface.
SSPC Technology Guide No. 1___ states that inspection work requires a minimum of 2 __-___ ___ and recommends ___ ___ ___.
- 12
2. 50-foot candles and recommends 200-foot candles.
The benefits of using environmental enclosures are Control of __ and ___.
Temperature and humidity.
Inspectors need to be familiar with the 1___ and observe/report 2___ ___ inside enclosures.
- Equipment
2. Environmental Conditions.
Even in enclosures, pockets of ___ or ___ ___ can occur.
Hot or cold air.
Use only the type of __- and ___ equipment appropriate for coating work.
Heating and dehumidifying
Some types of heating units add ___ and ___ ___ air into the enclosure.
Humidity and oil contaminated air.
SSPC Technology Update No. 6
________________
SSPC Technology update No. 16
Guides for the design and use of enclosures.
The majority of industrial coating undergo a ___ ___ to convert from a liquid to a solid.
Chemical Change.
By the nature of chemical reactions, 1___ ___ show down chemical reactions, while 2___ ___ speed up the reaction.
- Low Temps
2. High Temps.
The temperature at which a chemical reaction stops depends on?
The individual product/coating and it’s components.
A successful coating mixture is based on a delicate balance of ___ ___, a predictable ___ ___ ___, and a ___ that allows the coating to react in a consistent manner.
Correct mixing, a predictable solvent evaporation rate, and a temperature that allows the coating to react in a consistent manner.
Most coatings are formulated for application at a temperature range of 1___ and ___, with a max humidity of 2___.
- 41 to 122 F.
2. 85%
Some coatings are applied underwater with a ___ ___ humidity rate.
100 percent.
Exceptions to general temperature parameters include low temp coatings like 1___ ___ ___, which cures at temps as low as 2___ but requires a humidity of 3___ __ or higher.
- Inorganic Zinc Silicate.
- 32 F
- 50 percent.
Moisture cured polyurethanes require a minimum ___ ___.
Humidity level.
Some coating manufacturers supply a special cure for their 1___ that speeds up cure at temps below 2___.
- Epoxy.
2. 50 F
Some coating manufacturers make special 1___ coatings that cure at temps 2___ ___. The low temp of the material increases 3___ so additional 4___ is needed to increase ease of application.
- Epoxy
- Freezing.
- Viscosity
- Thinner/heating.
Adding thinner is not a good solution in low temp coating application. 1___ the coating is the correct solution.
Heating.
Low temps also slow the curing times of ___ cured coatings. This adds to production time and can lead to other problems as well.
Chemically.
1____ coatings normally cure at a 2___ ___ somewhat less than 3___.
- Polyurethane
- Minimum Temp.
- Epoxies.
Most solvent evaporation cure coatings are not as sensitive to 1___ ___ as 2 ___ ___ coatings.
- Lower temps.
2. Chemically cured.
___ or ___ ___ that are too high negatively affect coating application and cure.
Surface or air temps.
When surface temps are too high, the solvent in solvent-borne coatings evaporates too quickly and the 1___ ___ decreases, as does the 2___ of many two component materials.
- Pot life decreases,
2 Viscosity.
High humidity slows solvent evaporation and under certain conditions will leave ____ on the coating surface.
Moisture.
Moisture on coating during curing can cause problems, precisely what occurs depends on the?
Coating formulation.
Some curing agents used with 1___ and ___. coating are moisture sensitive. This means that instead of reacting with the 2___ as intended, they react with the moisture on the surface. This results in 3___.
- Epoxy and Polyurethane.
- Resin.
- Blushing.
The minimum effect of water on a curing coating is some loss of ___ or ___.
Loss of Gloss or color.
At worst, the effect of moisture on a curing coating is ___ ___ which must be removed prior to top coating.
Amine Blush.
Temp and humidity of coating storage areas should be recorded for, at least, ___ ___ before the use of material.
24 hours.
At minimum, record:
- ___ ___,
- ___ temp.
- ___ temp.
- ___
- ___ __
at the beginning and end of each shift. If these do not conform to the specification, inform the project supervisor.
- Ambient temp.
- Material temp.
- Surface temp.
- Humidity
- Dew Point.
If at all possible, continue to record 1___ __ during the 2 ___ ___. This could take as long as 7 days.
- Environmental Reading.
2. Curing phase.
