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1 GUIDELINE FOR EXPLOSION PROOF COMPONENTS FORGRASSO PISTON
COMPRESSORS & PACKAGES
1.1 Guideline for explosion proof com-ponents for Grasso piston
compres-sors & packagesl
The new called ATEX (Atmosphres Explosibles)guideline (Directive
94/9/EC) for explosion proof components was put into force on 30th
June 2003.For Grasso manufacturing and Product Selling Com-panies
the following categories are of importanceaccording to the specific
requirement:
A. Electrical components
B. Mechanical components which can generatesparking during
operation or standstill. \
C. All other components or constructio ns wheresurface
temperatures can be higher than thatpermitted according the
requested specification.
D. Risk analysis for components where no ATEXcertificate is
available.
General r emarks
1. Customers (contractors) who have a request for a compressor
(package) in EX execution must
be able to present the complete EX specifica-tion with which it
has to comply before Grasso isable to make an offer.
Caution!
Grasso cannot be responsible for thecorrect classification of
the system onsite. This is reserved for approved/qualified
organizations and local rules.
2. An EX explosion proof request has always tobe handled as
custom built due to the variety of
possible specifications (See page 3).3. The contractor is always
the responsible party
for the system supplied to the end user.
4. Grasso can only supply EX components whichare available as
standard on the market and aresupplied with an ATEX
certificate.(exceptions are the so called Grasso madecomponents
such as coupling and v-belt driveguards as well as the judgement of
surface tem-peratures of the relevant components. They willbe
accompanied by a risk analyses made byGrasso)
5. Electrical wiring of the EX components to a cen-
tral terminal box and interconnecting wiring arenormally not
performed by Grasso but are theresponsibility of the
contractor.
6. If Grasso Products BV can only partly complywith the required
specifications the customer should be correctly informed to prevent
misun-derstanding during the order process.
Caution!
Based on the above remarks GrassoProducts BV. cannot supply an
over-all certificate for the entire compres-sor system but only for
individualcomponents integrated therein.
Piston compressor/package components subjectto the ATEX
Directive (94/9/EC)
1. Electrical componentsCompressor:- Capacity control valves-
Crankcase heater - Oil level switch
- Electromagnetic stop valves- Electromagnetic injection valves-
Discharge temperature protection- Pressure switches- Pressure and
Temperature sensors- Control system (Monitron/GSC)Package:-
Electric motor compressor - Electric motor oil cooler fan- Electro
magnetic stop valves (oil return, econo-mizer)- Oil return
thermostat
2. Mechanical componentsCompressor:- Drive shaft / shaft
sealPackage:- Coupling and guard- Flywheel, pulley, v-belts and
guard- Oil cooler fan
Product Description | GrassoReciprocating Compressors for
industrial refrigeration
GEA Refrigeration Netherlands N.V. | 0089075_1 | Generated
23.04.2014 1
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3. Critical temperatures on surfaces ( others than Aand
B)Depending on the required temperature classT1-T6 the following
components should be takeninto consideration:Compressor:- Cylinder
housings and covers- Discharge gas manifolds- Economizer
shellPackage:- Discharge stop valve(s)- Discharge line(s) to oil
separator(s)- Oil separator(s)- Oil return line to compressor
T1/T2/T3 temperature classifications are normallynot a problem
since the allowable surface tempera-ture at T3 class is max. 200 C.
If however tempera-
ture class T4 (max. 135 C) is required an analysismust be made
of the maximum surface temperatureoccurring during full load and
part load running con-ditions of the selected compressor.
Hint!
It can happen that one or more compo-nents, as mentioned above,
cannot besupplied according the specificationas stated by the
customer. In that caseGrasso has to reject this project if noother
solution can be found
All EX components must comply with the newdirective: 94/9/EC -
ATEX and ordered with the cor-rect ATEX certificate. The old type
of certificationmust not be accepted !
EX marking on components (incl. example)
Primary Marking
CE-marking
Notified body xxxx
European "EX" marking
Apparatus group
I Mining
II Surface(all applications others thanmining)
Apparatus categoryM1 Mining very high protection grade
M2 Mining high protection grade
(Zone 0) 1 Surface very high protection grade
(Zone 1) 2 Surface high protection grade
(Zone 2) 3 Surface normal protection grade
Explosive substanceG Gas
D Dust
Result: ... II 2 G
Product Description | GrassoReciprocating Compressors for
industrial refrigeration
2 GEA Refrigeration Netherlands N.V. | 0089075_1 | Generated
23.04.2014
