Document 6bE8y9RKJxD1dKw2508VQrYE
American Society of Heating and Ventilating Engineers Guide; 1935
1 Btu 1 watthour 1 mean calorie 1 kilowatt_(1000-watts) 1 horsepower 1 boiler horsepower
777.5 ft-lb . 0.293 watthours 252.02 mean calories
2,655.2 ft-lb 3.415 Btu 3600 joules 860.648 mean calories
0.003968 Btu 3.085 ft-lb 0.0011619; watthours.
1.3405 horsepower^ 56.92 Btu per minute 44,252.7 ft-lb per minute
0.746 kilowatt 42.44 Btu per minute 33,000 ft-lb per minute 550 ft-lb per second.
33,471.9 Btu per hour
Weight and Volume
1 gal (U. S.) 1 British or Imperial gallon 1 cu ft 1 cu ft water at 60 F 1 cu ft water at 212 F 1 gal water at 60 F 1 gal water at 212 F 1 lb (avdp) 1 bushel V short ton 1 long ton
Pressure
1 lb per square inch
1 oz per square inch
1 atmosphere
1 in. water at 62 F
1 ft water at 62 F
1 in. mercury at 62 F
_ f 231 cu in. " \ 0.13368 cu ft = 277.274 cu in. _ / 7.4805 gal
\ 1728 cu in. = 62.37 lb = 59.76 lb = 8.34 lb = 7.99 lb _ / 16 oz
\ 7000 grains = 1.244 cu-ft = 2000 lb. = 2240 lb
144 lb per square foot
12.0416 in., mercury.at 62 F 2.309 ft water at 62 F 27.71 in. water at:62 F / 0.1276 in. mercury at 62 F \ 1.732 in. water at 62 F . - 14.7- lb per square inch
2116.3 lb per square foot = 33.974 ft water at 62 F
30. in. mercury at 62 F 29.921 in. mercury at 32 F ' 0.03609.1b per square inch = 0.5774 oz per square inch 5.196 lb per square foot '
{0.433 lb per square inch
62.355 lb per. square foot 0.491 lb per square inch
17.86 oz per square inch . . 1.131 ft water at 62 F 13.57 in. water at 62 F
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Chapter.41--Terminology
Metric Units
1 cm 1 in. 1m 1 ft 1 sq cm 1 sq in. 1 sq m 1 sq-ft-- - * 1 cu cm 1 cu in. 1 cu m ' 1 cu ft 1 liter 1 kg l lb 1 metric ton 1 gram 1 kilometer per hour
1 gram per square centimeter
1 kg per square centimeter (metric atmosphere)
1 gram per cubic centimeter
1 dyne
1 joule
1 metric horsepower
1 kilogram-calorie (large calorie)
= 0.3937 in.
= 2.54 cm
= 3:281 ft
= 0.3048 m
= 0.155 sq in.
= 6.45 sq cm
= 10.765 sq ft
= 0.0929 sq m
= 0.061 cu in.
= 16.39 cu cm
= 35.32 cu ft
=> 0.0283 cu m
= 1000 cu cm = 0.264 gal
= 2.2046 lb
= 0.4536 kg
= 2205 lb (avdp)
= 980.59 dynes = 0.002205 lb
= 0.6214 mph
_ / 0.0290 in. mercury, at 0 deg C \ 0.394 in. water, at 15 C
= 14.22 lb per square inch
I 0.03614 lb per cubic inch \ 62.43 lb per cubic foot
= 0.00007233 poundals
_ / 10;000,000 ergs
" I 0.73767 ft-lb
_ f 75 kg-m per second " \ 0.986 hp (U. S:)..............
{
1000 gram-calories calorie)
(small
1 kilogram-calorie per kilogram
- 1.83.9B7tuBptuer pound
1 gram-calorie per square centimeter
= 3.687 Btu per square foot
1 gram-calorie per square centimeter per centi meter
1.451 Btu per square foot perinch
1 gram-calorie per second per square centimeter
for a temperature graduation of 1 deg C per centimeter
2903 Btu per hour per square foot for a temperature graduation of
, 1 deg F per inch of thickness..
SYMBOLS FOR HEATINC AND VENTILATING DRAWINGS5
1. The objects of this standard set of symbols are to insure the correct interpretation of drawings and to conserve drafting room time by establishing simple and unmistakable symbols for the component parts of the heating and ventilating systems. In preparing the list of symbols an effort has been made to follow existing practice in so far as possible but the list cannot be expected to match exactly the existing practice of every drafting room.
2. Simplicity, ease of execution and unmistakable identification were carefully con sidered in selecting the symbols. Uncommon fittings and appliances such as vacuum pumps, separators, etc., have purposely been omitted in order to produce a list which can be easily remembered. It is assumed that when the scale of the drawing permits, the valves and fittings will be drawn to scale and a conventional representation is then unnecessary.
`From A.S.H.V.E. Code of Minimum Requirements for the Heating and VentilaUon of -Buildings, edition of 1929.
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