Conversion Formulas And Tables; General; Metric Prefixes; Pressure - Honeywell AUTOMATIC CONTROL Engineering Manual

CONVERSION FORMULAS AND TABLES

GENERAL

The conversion multiplier tables in this section provide
conversion factors. When the existing unit is multiplied by the
conversion factor, the result is the desired unit.

METRIC PREFIXES

Table 3. Metric Prefixes.
Prefix Symbol
9
giga G 10
6
mega M 10
3
kilo k 10
2
hecto h 10
1
deca da 10
–1
deci d 10
–2
centi c 10
–3
milli m 10
–6
micro µ 10
–9
nano n 10
EXAMPLES:
14 kilocalories = 1 x 10 3 calories = 14,000 calories
1 milliliter = 1 x 10 -3 liter = 0.001 liter
Pounds
per
Sq In.
Existing Unit (psi)
Pounds per —
Sq In. (psi)
Kilopascals (kPa) 0.1450
Ounces per Sq In. 0.0625
Millimeters of 0.0193
Mercury
Kilogram-force 14.22
2
per cm
Inches of Water 0.0361
Inches of Mercury 0.4912
Feet of Water 0.4335
Bar 14.5
Absolute Pressure = Gage Pressure + 14.74 psi
= Gage Pressure + 101.325 kPa.
1 pascal = 1 newton per square meter
EXAMPLE:
24 psi x 6.8948 = 165.48 kilopascals
Conversion Factor
1,000,000,000
1,000,000
1,000
100
10
0.1
0.01
0.001
0.000 001
0.000 000 001
Table 5. Pressure Conversion Multipliers.
Milli-
Kilo- Ounces meters
pascals per of
(kPa) Sq In. Mercury
6.8948 16.0 51.7
— 2.3207 7.503
0.4309 — 3.23
0.1333 0.3094 —
98.09 228.0 735.6
0.2491 0.578 1.865
3.387 7.86 25.4
2.989 6.928 22.42
100 232.072 750.188

PRESSURE

Table 4 lists converted values for psi to kPa using the 6.8948
factor then rounding off to the nearest whole number.
Table 4. Psi to kPa Conversion.
Psi kPa
1 7
2 14
3 21
4 28
5 34
6 41
7 48
8 55
9 62
10 69
11 76
12 83
13 90
14 97
15 103
Desired Unit
Kilogram- Inches
force of
2
per cm Water
0.0703 27.68
0.0102 4.014
0.004395 1.73
0.00136 0.5354
— 393.7
0.00254 —
0.03453 13.60
0.0305 12.0
1.0195 401.445
475 ENGINEERING MANUAL OF AUTOMATIC CONTROL
GENERAL ENGINEERING DATA
Psi kPa
16 110
17 117
18 124
19 131
20 138
21 145
22 152
23 159
24 165
25 172
26 179
27 186
28 193
29 200
30 207
Inches
of Feet of
Mercury Water
2.036 2.307 0.068948
0.2952 0.3346 0.01
0.127 0.144 0.004309
0.0394 0.04461 0.001333
28.96 32.81 0.9809
0.0735 0.0833 0.002491
— 1.133 0.03387
0.8826 — 0.02989
29.525 33.456
Bar
—