| |
TYPICAL CONDITIONS
|
|
| APPLICATION |
TEMP°F
|
HUMIDITY
|
NOTES
|
| Aerosols |
80
|
2 gr/lb dry air |
Use hood over Freon charging nozzle and
purge hood with very dry air |
| Brewing and Distilling |
|
|
|
| Hops Storage |
35
|
60% rh |
|
| Fermentation Rms |
|
45% rh |
To reduce mold growth on walls |
| Filter Rooms |
|
45% rh |
To reduce mold growth on walls |
| Grain Storage |
60
|
40% rh |
|
| Baking |
|
|
|
| Sugar Storage |
80
|
35% rh |
|
| Icing and Glazing |
80
|
35% rh |
|
| Cookie Drying |
65
|
20% rh |
|
| Filled Cookie Setting |
20-30
|
|
Dry air to minimize defrost requirement |
| Potato Chips |
75-80
|
20% rh |
|
| Candy |
|
|
Care should be exercised in
the system design to ensure against recirculating air-borne sugar
dust in the system. |
| Caramel Cooling |
60
|
40% rh |
| Bar Cooling |
0
|
40% -50% rh |
| Chocolate |
90
|
13% rh |
| Hard Candy Making |
75
|
35% rh |
| Hard Candy Packing |
75
|
35% rh |
| Sugar Storage |
80
|
35% rh |
| Concentrates |
|
|
Do not recirculate - Precool
and dry to 20-25 gr/lb |
| Molasses Grinding |
|
Less than 25% rh |
| Honey Grinding |
|
Less than 25% rh |
| Instant Coffee Packing |
80
|
20% rh |
|
| Citrus Crystal Packing |
80
|
15% rh |
|
| Ferrous Cupola Dry Blast |
|
40 gr/lb dry air |
|
| Crystal Growing |
|
Varies |
Dependent on particular salt |
| Crystal Cutting |
|
Varies |
Dependent on particular salt |
| Coils-Electronic |
|
Lowest possible 1-3 gr/lb dry
air |
Prevent moisture absorption
by insulation |
| Coils - TV and X-Ray |
72
|
15% rh |
|
| Transformer Manufacturing and
Rebuilding |
80
|
5% rh |
|
| Elec. Appliances |
72
|
15% rh |
In blankets and pads with Nylon sheathing
or insulation, moisture causes shorting and change in electrical characteristics
and moisture absorbed in sealed sheath heating elements can cause
failure and even explosion. |
Lightning Arrestor
(Assembly) |
60
|
20% rh |
|
| |
TYPICAL CONDITIONS |
|
| APPLICATION |
TEMP°F
|
HUMIDITY
|
NOTES
|
| Switch Gear Assembly |
68
|
20-24% rh |
|
| Lamination |
80
|
20% rh max. |
Paper, cloth or wood, glass fibers, etc.
bonded with plastic, shellac, varnish or glue. Store material at 20%
rh to insure good bond. Store finished goods at less than 80oF
at 20% rh to prevent adhesion. |
| Chinchilla Raising |
32-35
|
18-25% rh |
High humidity is a health hazard. Low
temperature and humidity provide denser and better pelts. |
| Matches |
70
|
40% rh |
For drying |
| Paper Coating |
80
|
20% rh |
For paper storage prior to coating with
wax, plastic, adhesive etc. To insure bond (See lamination) (Limit
paper to 4% moisture) |
| Paint Spraying and Lacquering |
80
|
50%rh or less |
Control spray booth or cabinet to prevent
blushing caused by moisture condensing on evaporative cooled surface
(evaporation of paint or lacquer solvent). Do not recirculate. |
| Paper and Fiber Molding |
80
|
20% rh |
Finished good storage to prevent sticky
condition and loss of shape |
| Printing and Binding |
90
|
30% rh |
Paper storage to prevent excessive moisture
content (4-6% maximum) and resultant high static electric charge.
Changes in moisture content between impressions causes poor register |
| Pharmaceuticals |
|
|
|
| Ampule Mfg. |
80
|
30% rh |
|
| Penicillin Packaging |
80
|
5-15% rh |
Hygroscopic Product |
| Capsule Storage |
75
|
35-40% rh |
Gelatin softens and distorts at higher
temperature and humidity |
| Colloids |
70
|
35% rh |
|
| Cough Syrups |
80
|
40% rh |
|
| Cough Drops |
70
|
30% rh |
Similar to hard candy |
| Effervescents |
90
|
15% rh |
Powders or Tablets |
| Extracts - |
|
|
|
| Glandular |
70-80
|
5-10% rh |
| Liver |
70-80
|
5-10% rh |
| Tablet Coating |
80
|
5-30% rh |
| Tablet Compressing |
70-80
|
10-30% rh |
| Powder Storage |
70-80
|
15-30% rh |
| Powder Mfgr |
70-80
|
15-30% rh |
| Powder Milling |
80
|
35% rh |
| Plastics, Nylon, etc. |
80
|
3-15% rh |
For drying storage prior to molding |
| Plastics, Manufacturing Area for Thermo Setting
and Moulding Compounds |
80
|
25-30% rh |
|
| TV-Radio Broadcasting |
70
|
20% rh |
Tape head life extension |
| |
TYPICAL CONDITIONS |
|
| APPLICATION |
TEMP°F
|
HUMIDITY
|
NOTES
|
| Plastic, Laminated Built-up areas Parchment
storage |
70
70
|
20% rh
35% rh |
High efficiency filters required to eliminate
dust and fumes |
| Plywood |
90
|
15-25% rh |
Cold pressing |
| Rubber Products |
|
|
|
| Dipped Goods |
75-90
|
25-30% rh |
Dew point of air must be below
evaportion temperature of solvent. |
| Cementing |
80
|
25-30% rh |
| Tire Cord |
125
|
7% rh |
For storage to prevent moisture absorption
and resulting loss and adhesion with rubber. |
| Glass Laminating |
68-70
|
15-20% rh |
To insure good long life bond |
Explosives
Gun Powder,
Solid Fuels |
35-75
|
10-50% rh |
Range is great dependent on material,
but storage is critical – eg - solid fuel power is calculated with
consideration of time stored at given condition |
| Freezer Tunnel Vestibules |
75
|
10-20% rh |
Introduce air as curtain in front of
tunnel opening |
| Pipe Galleries |
40-80
|
40-50% rh |
Maintain space dew-point below piped
fluid temperature to eliminate condensation. Maintain temperature
to eliminate corrosion. |
| Telephone & Electrical Cable Wrapping |
80
|
5-20% rh |
Extra high voltage cable wrapping has
no lower limit on moisture. Upper limit is about 5% rh. |
| Seed Drying & Storage |
35-80
|
10-25% rh |
Low temperature drying and low rh storage
preserves germination potential. |
| Food Drying Bins |
95-105
|
2 gr/lb dry air |
Spices - condiments |
| Transformer (Electric) |
90
|
10-25% rh |
|
| Transistors |
72-75
|
25-40% rh |
|
| Tubes - Radio TV - Lighting |
90
|
15-25% rh |
Drying inside coating - There is no minimum
moisture level - The dryer the air - the better |
| Missiles |
35
|
35% rh |
Purging and cooling |
|
80
|
25% rh |
Assembly |
| Fertilizer Storage |
AMB
|
40-50% rh |
Deliver air, 1½ air changes/hour
at 25% rh when corrected to ambient dry bulb. |
The above applications represent a very small percentage of the needs
and uses for dry air; the conditions cited are typical of past uses. Specific
needs change, as do technology and manufacturing process. Your Bry-Air
representative can determine appropriate values for a particular application.
