Gestra Products Technical - Control And Power

Useful Information / Conversions
Useful Information
Abbreviations used throughout this catalogue:
DN – Dimension, nominal . The nominal size of a pipe or fitting in mm or inch, if stated .
PN – Pressure, nominal . The nominal pressure rating
(Maximum cold working pressure) in bar .
∆PMX – Maximum differential pressure (inlet pressure minus outlet pressure)
PMA – Maximum allowable working pressure
PMO – Maximum operating pressure
TMA – Maximum allowable working temperature
PAMAX – Maximum service pressure
BSP – British Standard Pipe (DIN ISO 228)
NPT – American Standard Taper Pipe Thread (National Pipe Tapered)
Conversions
In this catalogue the International System of Units (SI) is applied .
The following conversions into the Imperial System for the units used in this catalogue
might be useful:
SI Units Imperial Units Conversion
bar psi 1 bar = 14 .504 psi
°C °F 1°F = °C x 9/5 + 32
kg/h lb/h 1 kg/h = 2 .204 lb/h
l/s gpm 1 l/s = 13 .22 igpm
= 15 .85 usgpm
kv Cv Cv = 1 .13 kv (usgpm)
Pressure-Temperature Ratings
It is not possible to give direct conversions between DIN and ANSI ratings, and space
does not permit a detailed comparison . When selecting valves against specific duties, all service data must be
fully considered . The following table is provided to guide the reader
who may not be familiar with the general relationship between DIN and ASME ratings .
DIN Rating ASME Class Equivalent nominal sizes
PN 10
PN 16
PN 25
PN 40
125 lb
150 lb
300 lb
PN 63
PN 100 600 lb
900 lb
PN 160
PN 250 1500 lb
PN 320
PN 400
2500 lb
PN 630
DN 8 mm = 1/4"
10 mm = 3 /8"
15 mm = 1/2"
20 mm = 3/4"
25 mm = 1"
32 mm = 1 1/4"
40 mm = 1 1/2"
50 mm = 2"
65 mm = 2 1/2"
80 mm = 3"
100 mm = 4"
125 mm = 5"
150 mm = 6"
200 mm = 8"
DN 300 mm = 12"
350 mm = 14"
400 mm = 16"
450 mm = 18"
500 mm = 20"
600 mm = 24"
700 mm = 28"
750 mm = 30"
800 mm = 32"
900 mm = 36"
1000 mm = 40"
1050 mm = 42"
1200 mm = 48"
159
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