Viking Pump TSM344: CMD Mag Drive - Manual (Page 21)

SECTION TSM 344 ISSUE F PAGE 21 OF 24
ECO / ISOChEM / CMD IOM ADDENDUM
ATEX Directive 94/9/EC
Potentially Explosive Atmospheres
NP550110-IOM REv B
8/10/2005
Scope
This addendum is to the Installation, Operation and
Maintenance Manual of the CMD Gear Pump family of
pumps. It includes all the necessary additional information
to be considered when installing these pump models in
potentially explosive environments (Group II, Category 2,
G & D).
Models Included in the Assessment
▪ CMD Series magnetically driven gear pumps.
Description of Equipment
The general product description for this equipment is positive
displacement external gear pumps. They are supplied as
mechanically sealed and magnetically driven versions.
Intended Usage of the Equipment
CMD gear pumps are intended to be used to transfer various
fluids. With proper sensors or feedback devices they can also
be used to meter fluids.
The manufacturer has decided to construct the pumps to
meet the requirements for Group II, category 2 equipment.
To meet Category 2 equipment requirements, all possible
ignition sources that can occur in normal operation of the
pumps and additionally, those that can become effective as
a result of malfunctions expected to occur in service must
be considered. As the pumps are not intended to meet the
requirements of category I, potential ignition sources arising
from rare malfunctions can be neglected.
Reference Standards
▪ 97/38/EC Machinery safety directive.
▪ EN 13463-1 (2001) Non-electrical equipment for potentially
explosive atmospheres - Part 1: Basic method and
requirements.
▪ EN 1127-1 Explosive atmospheres - Explosion prevention
and protection - Part I: Basic concepts and methodology.
▪ EN 60529 Degrees of protection provided by enclosures
(IP Code).
Equipment
Equipment in Group II, Category 2, is intended for use in
areas in which explosive atmospheres caused by gases,
vapors, mists or air/dust mixtures are likely to occur.
G & D Atmospheres
▪ In G type Explosive atmosphere (Gas, vapor, mist)
equipment is suitable for use in Zone 1 areas.
▪ In D type Explosive atmosphere (Dust) equipment is
suitable for use in Zone 21 areas.
Temperature Class
▪ Temperature class TX based on ambient and pumped fluid
temperature.
▪ Different temperature classes can be achieved based on
fluid and ambient temperatures (See chart below).
ATEX DIRECTIvE
Temperature
Class
Maximum Surface
Temperature °C
Permitted (Dust)
Maximum Liquid or Ambient
Temperature °C Comments
Sealed Pumps Magnetic Drive
T1 450 260 230
Fluid temperatures are limited by pump
construction
T2 300 225 225
T3 200 145 145
T4 135 90 90
T5 100 65 65
T6 85 50 50 Normal class rating
Note: Maximum Temperature Class for CMD Series Pumps is T6.
TEMPERATURE CLASS AND MAXIMUM LIQUID TEMPERATURES