Introduction; Conversion Formulas And Tables; General; Metric Prefixes - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

GENERAL ENGINEERING DATA

INTRODUCTION

This section provides engineering data of a general nature. It is reference information applicable to any or all other sections of
the Engineering Manual of Automatic Control.

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 1. 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 10
–9
nano n 10
EXAMPLES:
14 kilocalories = 14 x 10 3
-3
1 milliliter =1 x 10 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
calories = 14,000 calories
Table 3. Pressure Conversion Multipliers.
Kilo- Ounces Millimeters
pascals per
(kPa) Sq In.
6.8948 16.0 51.7
— 2.3207
0.4309 —
0.1333 0.3094
98.09 228.0 735.6
0.2491 0.578
3.387 7.86 25.4
2.989 6.928 22.42
100 232.072 750.188

PRESSURE

Table 2 lists converted values for psi to kPa using the 6.8948
factor then rounding off to the nearest whole number.
Table 2. Psi to kPa Conversion.
Psi
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Desired Unit
Kilogram- Inches
of force
2
Mercury per cm
0.0703
7.503 0.0102
3.23 0.004395
— 0.00136
— 393.7
1.865 0.00254
0.03453
0.0305
1.0195 401.445
ENGINEERING MANUAL OF AUTOMATIC CONTROL
466
kPa Psi
7 16
14 17
21 18
28 19
34 20
41 21
48 22
55 23
62 24
69 25
76 26
83 27
90 28
97 29
103 30
Inches
of of Feet of
Water Mercury Water
27.68 2.036 2.307
4.014 0.2952 0.3346
1.73 0.127 0.144
0.5354 0.0394 0.04461 0.001333
28.96 32.81
— 0.0735 0.0833
13.60 — 1.133
12.0 0.8826 —
29.525 33.456
kPa
110
117
124
131
138
145
152
159
165
172
179
186
193
200
207
Bar
0.068948
0.01
0.004309
0.9809
0.002491
0.03387
0.02989
—