Sample collection means of protection when working in the field of wastewater treatment plants

GUV-I 8594 GUV information

Sample collection means of protection when working in the field of wastewater treatment plants

Edition January 2005

Publisher Bundesverband the Unfallkassen Fockenstein Strae 1, 81539 Munich www.unfallkassen.de

Edition January 2005

Prepared by the Section "Disposal" of the Federation the Accident Insurers (BUK) in collaboration with the BG expert committee "chemistry", Subject: 62 explosion, Kurfrstenanlage, 69115 Heidelberg.

Order no. GUV-I 8594 to reflect, vom competent accident insurance, see penultimate cover.

3

Sample collection means of protection when working in the field of wastewater treatment plants

Application of this Sample collection

The Section "Disposal" of the Federation the Accident Insurers (BUK) has this collection of examples of sewage systems that were previously in the Blue Print (07/2000) listed under point 4.1 in the current collection of examples of the explosion protection regulations, created as a separate booklet. *)

You gives the entrepreneur a help, its obligation under 5 of the operating instructions (air) comply dividing hazardous areas into zones.

Explosionsschutzmanahmen

For to determine the nature and extent of the measures in potentially hazardous areas is to Annex 4 of the Ordinance on Industrial Safety and the "Explosion protection rules - (EX-RL) "(GUV-R 104) referenced. This can for example under the In-ternet www.hvbg.de be viewed at BGR 104th

For some common key terms here the definitions (see 2 of the Ordinance on Industrial Safety and Section B of the "explosion protection rules") stated:

Explosionsfhige Atmosphere:

Explosive Atmosphereist is a mixture of air and flammable gases, vapors, mists or dusts under atmospheric conditions in which the combustion process after ignition transfers to the entire unburned mixture ( 2 (8) Industrial Safety Ordinance).

Note: As atmospheric conditions apply Here total pressures from 0.8 bar to 1.1 bar and the mixture temperature of -20 C to +60 C.

*) The above version 07/2000 has been amended slightly editorial. Furthermore, were the No. 3.7 a, 3.10 and 3.11 materially changed.

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GUV-I 8594

Explosive Atmosphere:

Explosive atmosphere (pea) is an explosive atmosphere occurring in such amount (danger threatening amount) that special protective measures for the maintenance of protection of safety and health of workers or others are required ( 2 (9) Reliable safety regulation).

Imminent Danger Quantity:

More than 10 liters of explosive atmosphere as cohesive group have to be considered in closed rooms, regardless of the room size is always a hazardous explosive atmosphere. Smaller quantities can already be potentially hazardous if, when they are in close proximity to people. Even in periods of less than about 100 m3 already a smaller amount than 10 liters must be regarded as hazardous. A rough estimate can be made by the rule of thumb that in such rooms explosive atmosphere by more than a ten-thousandth of the space volume must be considered as potentially hazardous if, eg in a space of 80 m3 8 liters. However, this does not infer that then the entire space as a hazardous applies, but only part of the area, may occur in which an explosive atmosphere (see Section 1.3.4.1 of the explosion E-rule [GUV-R 104, previously GUV 19.8]).

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GUV-I 8594

Explosionsgefhrdeter Range:

A hazardous is an area that may occur in which an explosive atmosphere. One area that is not expected to in which an explosive atmosphere in an amount such that special protective measures are needed shall not be considered a hazardous area ( 2 (10) Betriebssicherheitsver Regulation).

Ztions classification of hazardous Areas

The following zoning applies to areas where arrangements set out in 3, 4 and 6 of the Ordinance on Industrial Safety must be taken. This classification provides the scope of the aforementioned measures to be taken according to Annex 4, section A Regulation.

Explosionsgefhrdete Ranges of frequency and duration of the occurrence of an explosive atmosphere in zones:

Zone 0 is an area in which an explosive atmosphere consisting of a mixture of air and flammable gases, vapors or mists or for long periods or frequently.

Zone 1 ist is an area where at times during normal operation form an explosive atmosphere as a mixture of air and flammable gases, vapors or mists.

Zone 2 is an area in which under normal operation a dangerous explosive atmosphere as a mixture of air and flammable gases, vapors or mists or not normally occurs only briefly.

Zone 20 is an area that constantly in the explosive atmosphere in the form of a cloud of combustible dust in the air for long periods or frequently.

Zone 21 ist is an area where at times during normal operation form an explosive atmosphere in the form of a cloud in the air corresponds haltenem combustible dust.

Zone 22 is an area in which under normal operation a potentially explosive atmosphere in the form of a cloud of combustible dust in air is not normally occur or only briefly.

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GUV-I 8594

The following sample collection may be used as a decision aid for classifying potentially explosive areas into zones.

Sample collection (Excerpt from the foreword the explosion protection regulations)

The listed in each example measures are taken into account for the normal operation, but also failures. They can serve as decision support in the selection of the nature and extent of the measures for the prevention of explosion hazards.

For first and repeated startup and shutdown of a plant and the explosion protection in common areas available via openings to hazardous areas in conjunction, special considerations apply.

Under Section D 1 the explosion protection rules "basis for the assessment of the risk of explosion", the decision of whether and how likely an explosive atmosphere may occur, given off by the circum-stances and must always refer to this particular case. Therefore, when applied to investigate the collection of examples, always check to be assessed in the case matches the occurrence of an explosive atmosphere in the amount and the probability with which the example of the underlying facts of the matter.

Deviations from the Sample collection requirements specified in the amendments to the zone or its extension is possible.

In the sample collection zone expansions are given in column 5 in meters. It is assumed that the g.e.A. approximately spherical shape around the discharge point, wherein the outlet point is propagated to see-as the center of the sphere radius. Possible deviations are especially mentioned. Proximity is the imme-diate vicinity of the discharge point. The radius of the immediate area is 0.5 m.

For surface sources the zone is usually caused by an envelope with Verrundungsradius specified.

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GUV-I 8594

In cases where hazardous areas (zones) measures to E 1 of the explosion protection regulations (GUV-R 104, previously GUV 19.8) are reduced or eliminated, consider the following:

In the opinion of the Technical Committee "Chemistry", Subject "Explosion" mentioned in column 5 of the sample collection extensions of zones shall be used optimally for the measures to E 1 (column 4). This should be considered in the required assessment of the individual case.

Particularly clearly this issue is by applying the protective measure "Technical ventilation" (Section 1.3.4.2 E of explosion protection rules [GUV-R 104, previously GUV 19.8])

Wie shown in Section E 1.3.4 of explosion protection rules, an optimal design of the ventilation system is possible only if the expected maximum amount leaking substances and the other conditions are known or can be estimated reliably.

In the examples, referring only to the vicinity of the equipment, the interior of the apparatus requires a separate assessment.

The e specified in sections 1.3.1 to 1.3.3 of the e explosion protection rules prerequisites of explosion protection must always be met, and they are not in the examples mentioned.

Notes to tables:

First In the presence mentioned in column 2 of the plant or processes in column 3 shall different apparatus or process-related conditions or features or comments occur [a), b), c), ..., 1, 2, 3, ...]. Among these points is indicated to what extent the occurrence of a hazardous explosive atmosphere (pea) is expected.

Second For the case that, with g.e.A. must be calculated, is mentioned in column 4 whether in the plant protection measures by E 1 (Avoid explosive atmos-phere) are applied.

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GUV-I 8594

Third Can safeguard measures as E 1 (column 4) are not or not fully carried out, are protective measures to E 2 (Avoidance of ignition sources), depending on the applicable zone, necessary.

4th Is avoiding g.e.A. and no ignition sources in accordance with the respective zone possible, protective measures for E 3 (Constructive explosion protection) necessary and indicated in column 6.

The TLV is generally two to three orders of magnitude below the lower explosion plosionsgrenze (LEL). If increased health reasons technical measures must be carried out in areas the probability of occurrence and the extent of a potential explosive atmosphere are indeed significantly reduced, an at least briefly exceeded the LEL can there-by but not always be excluded. This is especially true for dust when dust deposits can form. To that fact in the collection of examples of the explosion protection regulations referenced.

Explanation of the example used in the collection Abbreviations

no Protective measures to E 1, E 2 and E 3 are not required. gR Protective measures for e 2 are carried out throughout the room. Expansion The Numerical data for the extension of the zone is always in meters to zones vpurchase. Provided that no particular form of words From the

geometric expansion of the zone is made, the number means the radius of a sphere around the source for the formation of explosive atmospheres (exit point of flammable substances or the like).

g.e.A explosive Atmosphere.

b) as a) means in column 3 (features, comments / conditions) the same facts as in a) specified. In column 4, but another protective measure is provided and thus investments in column 5 in a different zoning than a); may they can even be omitted.

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GUV-I 8594

The term the individual protective measures (E ...) corresponds to the contents list of the EX-RL and is used in the following table.

I 1.1 Vermeiden or restriction of substances, The explosive Mixtures to are able to form

Preventing E 1.2 oder limiting the formation of explosive Mixtures inside of appliances

E1.2.1 Konzentrationsbegrenzung

E1.2.2 Inertisieren

E1.2.2.1 Inerting explosive atmosphere of flammable gases and vapors

E1.2.2.2 Inerting flammable STube

E1.2.2.3 Inerting hybrid Mixtures

E1.2.3 Application of Vakuum-/Unterdruckfahrweise

E1.3 Verhindern or restricting the formation of a hazardous explosive atmosphere in the vicinity of equipment

E1.3.1 Vexperienced technical measures design and spatial Arrangement the operating systems

E1.3.2 Tightness of equipment

E1.3.2.1 Permanently technically tight Apparatuses

E1.3.2.2 Technical density equipment

E1.3.2.3 Apparatuses with operational spills of flammable substances

E1.3.3 Pheck the equipment for tightness

E1.3.4 Ventilation measures

E1.3.4.1 Natural Ventilation

E1.3.4.2 Technical ventilation (ventilation) E 1.3.4.3 Object extraction E1.4 Monitoring the concentration around

Apparatuses

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GUV-I 8594

E1.4.1 Gaswarnanlagen which trigger an alarm

E1.4.2 gas detection systems with automatic triggering of circuits

E1.4.3 Gaswarnanlagen with automatic triggering of emergency functions

E1.5 Measures for eliminating dust in the area Sdeaf leading equipment and container

E2.3.6 Statische Electricity

E3 Konstruktiver explosion

E3.1 Explosionsfeste Method of construction

E3.1.1 Explosionsdruckfeste Method of construction

E3.1.2 Explosion pressure shock resistant design

E3.2 Explosion pressure relief

E3.3 Explosionsunterdrckung

E3.4 Verhindern of explosion propagation

E3.4.1 Flame arresters for gases, vapors and mists

Explanations are comprised the "explosion protection rules" (GUV-R 104, previously GUV 19.8). This can for example on the Internet at www.hvbg.de BGR 104 are under eingese-ing.

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GUV-I 8594

Breakdown of Sample collection

1 Abwater drainage

1.1 Enclosed spaces, where waste is stored, and the interior of vessels, tanks and pipes closed derivation of systems (eg pumps templates, sumps, tunnels, rain basins, storage sewers, manholes, are vented to the pressure tubes, Dkerbauwerke)

1.2 From Wastewater -carrying Means (e.g. channels, Pressure pipelines Run through manholes, crash structures, deep open channels [T> 2 m])

1.3 Facilities, which can be brought about with the openings mentioned in 1.1 devices in combination (eg rooms with dry-installed sewage pump-set or closed drainage systems, access to rainwater tanks or reservoirs)

2 Sewage treatment

2.1 Aboveground Facilities in the inlet area of waste water treatment were that flows through wastewater (eg intake structures, computational building sand traps in buildings)

2.2 The interior of vessels, tanks and wires and umschlos Sene-spaces that are traversed by sewage sludge or waste water or sewage sludge which is located (eg, encapsulated by the investor parts, enclosed basins and channels, sumps, valves and distribution structures)

2.3 Rooms,Tuese can be brought about with the openings under 2.2 devices mentioned in conjunction (eg building with closed channels and sealed system parts, engine rooms on completed covered sumps, rooms with opening sludge template containers)

2.4 Open-end parts outdoors

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GUV-I 8594

3 Sludge

3.1 Closed digester

3.2 rooms, which are filled with sludge or septic or water flows through these media (eg Faulschlamm/Faulwasser- bay, thickener)

3.3 Facilities, the digester gas leading technical equipment included (eg Gasleitungen, fittings, Meters)

3.4 Faulgas leading technological equipment, the operation or WMaintenance be opened (eg, gas filters, desulfurizer, Dryer)

3.5 Facilities, The traps contain

3.6 Areas open into the gas pressure relief

3.7 Gasbehlter for biogas

3.8 Gasfackeln

3.9 Gasentschwefler

3.10 Faulgasbetriebene Devices (e.g. gas machines Brenner)

3.11 Fan and compressors for biogas

3.12 pressure regulator for biogas

3.13 Facilities, where sludge is de-watered

3.14 Areas is stored in which dewatered sludge

3.15 Sludge dryer and spaces in which dried sludge is stored

Lfd. No. Example Features / Notes / Requirements Protective measures nach E1

Stipulationsg of the zones (Zndquellenver avoidance by E 2)

Protective tailor-took nach E 3

(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

13

Abwassertechnische Facilities

1 Drainage

To Scope and definitions laid see UVV "Sewage Plant" GUV-V C5 (previously GUV 7.4).

In the sewerage systems in normal operation with the occurrence of geA expected (eg, vapors from flammable liquids [adoption to 100 gallons of gasoline or other relevant materials], digester gas formation). For extreme interference or addition of pure oxygen, additional protective measures are required.




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

14

}

1.1

1.2

Enclosed spaces in which waste water is stored, and the interior of vessels, tanks and pipes closed purge systems (eg Pumpenvor documents, sumps, tunnels, storm tanks, storage sewers, manholes te be in the pressure pipes vented, culvert construction - works).

Vom wastewater durchflos Sene-devices (eg channels, Druckrohrleitun-tions Run through manholes, Absturzbau-works, deep open channels [T>2 m]).

a) Above the liquid with the up-take is a geA expected (eg, vapors from flammable liquids and / or biogas)

b) as a)

c) as a)

In carrying Abwasserein municipal facilities can plant and operating equipment will be flooded as intended:

a) in non-ventilated facilities above the liquid with the occurrence a g.e.A. expected (eg, through vapors of flammable liquids). Natural ventilation is obstructed (eg by gas-tight or Surface water sealed manhole covers);

E 1.3.4.1

E 1.3.4.2

E 1.3.4.2 E 1.4.3

no

Zone 1: gR

Zone 2: gR

(No, in the near zone 1 acc. E 1.4 point s)

Zone 1: gR

no

no no

no




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

15

b) adequate natural ventilation is given. The formation of a g.e.A. e.g. by vapors from flammable liquids not or only briefly is ex-pected;

c) The ventilation system is designed so that above the liquid with the occurrence of a geA to be expected.

E 1.3.4.1

E 1.3.4.2

Zone 2: gR

no

no

no

1.3 Spaces that can be openings associated with these facilities under 1.1 combined (eg sewage pump-rooms with dry-positioned or closed purge systems, access to rainwater tanks or Storage areas).

When Open as mentioned under 1.1 A devices is the formation of a geA not be excluded. When repairs or maintenance (See Section E 5):

a) The opening is intended tightly closed and opened only with special auxiliary agents;

b) The opening is closed as intended;

E 1.3.4.1

E 1.3.4.1

no

Zone 2: gR

no

no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

16

}

c) The opening is closed as intended, but not sealed;

d) as c);

e) as c);

f) as c) but with the suction under Mentioned in paragraph 1.1 devices.

E 1.3.4.1

E 1.3.4.2

E 1.3.4.2 E 1.4.3

E 1.3.4.1

Zone 1: 1 m to opening Zone 2: gR

Zone 2: 1 m to any opening: Other Area

no gem in the vicinity of Zone 2. I 1.4 point s)

no

no no

no no




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

17

2 Sewage treatment With the occurrence of a g.e.A. by vapors from flammable liquids can be expected especially in the inlet areas of wastewater treatment plants. The formation of a g.e.A. by vapors from flammable liquids can be excluded after a wastewater treatment (eg in aerated grit chambers, aeration tanks or other facilities with intensive technical or natural ventilation) has been performed. Digester gases by long-distance transport in the sewer or long residence times of the wastewater or Klrschlam-mes in the wastewater treatment plant occur.

2.1 Aboveground facilities in the entry area of wastewater treatment plants, which flows through wastewater (eg, intake structures, computational building sand-catches in buildings).

For flume closed and sealed Plant parts, see 2.2:

a) In the inlet area of wastewater treatment plants above the liquid with the occurrence of geA (Eg due to vapors from flammable liquids and / or digester gas) is expected;

no Zone 1: gR no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

18

}

}

b) as a);

c) as a);

d) as a);

E 1.3.4.1

E 1.3.4.2

E 1.3.4.2 E 1.4.3

Zone 1: in the channel Zone 2: gR

Zone 2: gR

No, according to the short-range zone 2. I 1.4 point s)

no no

no

2.2 The Interior of vessels, tanks and pipes and enclosed spaces that are of wastewater and sewage sludge by-incorporated or in which waste or sewage sludge-being det (eg encapsulated plant components, closed basins and channels, sumps, slide and distribution structures).

a) Above the liquid with the up-take is a geA expected (eg, vapors from flammable liquids and / or biogas);

b) as a);

c) as a).

no

E 1.3.4.2

E 1.3.4.2 E 1.4.3

Zone 1: gR

Zone 2: gR

No, according to the short-range zone 2. I 1.4 point s)

no

no no




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

19

2.3 Spaces that brought about openings with the under 2.2-mentioned institutions in connection is to (eg building with closed Gerin-tion and sealed system parts, machinery spaces over covered sumps, rooms with opening sludge template containers) can.

see Case examples in 1.3

2.4 Open parts of the plant in Free

Yourch the given ventilation, formation of a geA not expected.

no no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

20

3

3.1

3.1.1

Sludge

Closed septic tank

The produced in enclosed digesters biogas is collected in septic tanks and head derived, and possibly processed, stored, used or flared. For open digester is 3.2.

A g.e.A. may occur in the digester through air infiltration and its environs by leakage of sewer gas.

In the normal range a slight positive pressure to prevent the digester head penetration of air and thus the formation of a geA in the digester:

a) during the lowering of negative pressure can

Sludge level arise;

b) The formation of negative pressure (penetration of air) is prevented (for example, through normal operation of mud and overflow Pressure or level monitoring with triggering emergency functions, eg Close of indulgences).

no

E 1.3.1

Zone 1: entire gas system

no

no no




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

21

3.1.2 Escape digester gas through pipes leading into the digester is prevented. (eg level monitoring with triggering emergency functions or permanently effective closure of the lines with water or mud)

E 1.3.1 no no

3.1.3 After opening of the septic tank or part-

completely emptied with a g.e.A. the digestion

container and can be expected in the environment:

Internally a) After opening, or if the air Draining of slurry (e.g. about the

no Zone 0: gR over mud-mirror no

Emergency overflow or floating scum

deliver can occur);

b) as a), for natural ventilation;

c) as a), with technical ventilation;

d) During the repression of g.e.A. by newly formed sewer gas into the atmosphere.

E 1.3.4.1

E 1.3.4.2

no

Zone 1: gR over mud-mirror



no

no no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

22

In the surrounding area a) opening directly to the outside;

b) opening into rooms;

c) as b)

d) opening to open shafts outdoors (E.g. scum pit);

e) as d).

no

E 1.3.4.1

E 1.3.4.2

E 1.3.4.1

E 1.3.4.2

Zone 1: 1 m to exit opening

Zone 2: additional 2 to m Outlet

Zone 1: gR Zone 2: 1 m openings

Space

Zone 2: gR

Zone 1: gR in the shaft Zone 2: 3 m shaft to top

edge

Zone 2: gR in the shaft

no

no

no no

no




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

23

3.2

3.3

Spaces that are filled with sludge or septic or water flowed-through from these media (eg digester schlamm/Faulwasser- bay, thickener).

Rooms, the digester gas leading technical equipment included (eg gas lines, fittings, gauges).

It must match the outgassing and formation of a g.e.A. expected to be:

a) enclosed spaces;

b) as a);

c) open pits or tanks.

Digester gas leading technical equipment are technically tight and mechanically, chemically and thermally stable:

a) in unventilated rooms;

b) in rooms with continuous natural Ventilation.

E 1.3.4.1

E 1.3.4.2

E 1.3.4.1

no

E 1.3.4.1

Zone 1: gR Zone 2: 1 m to openings of

enclosed space

Zone 2:

Zone 2 gR:

gR

Zone 2: gR

no

no

no no

no no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

24

3.4 Digester gas Leading technical equipment to be opened for operation or maintenance (eg, gas filter-entschwef LER, dryer).

In the Is the formation of a inner g.e.A. expected by inflow of air:

a) after the opening;

b) as a) but after inerting before Open;

c) as a) but after eliminating g.e.A. by aeration;

d) During the repression of g.e.A. by Fermentation gases into the atmosphere.

Is in the area with the formation of a g.e.A. expected by leakage of sewer gas.

e) opening directly to the outside;

no

E 1.2.2

E 1.3.4.2

no

Zone 0: Inside no

no

Zone 0: Inside



no no

no no

no




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

25

3.5 Facilities, the steam traps contain

f) Opening to rooms;

g) as f);

h) as f) but inerting before opening;

i) After closing an g.e.A. in the Interior with sewer gas into the open

displaced.

When drainage valves open or What server closures with the formation of a g.e.A. occur as a result of breakdown or drying out of the water as a result of closures or misuse:

a) for discharge into enclosed spaces;

b) as a);

E 1.3.4.1

E 1.3.4.2

E 1.2.2

no

E 1.3.4.1

E 1.3.4.2


Zone 2: gR

Zone 2: 3 m at outlet opening

no



Zone 1: gR Zone 2: 1 m to openings of

enclosed space

Zone 2: gR

no

no no

no

no

no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

26

c) discharge into the open air;

d) The use of closed drainage systems, locks with dual check valves or drainage point is a gas outlet prevented.

E 1.3.4.1

E 1.3.1



no

no

no

3.6 Areas in the gas Which opens directly to the outside overpressure

E 1.3.4.1 Zone 1: 1 m to exit no

overpressure reliefs merge

reliefs.

opening Zone 2: additional 2 to m

Outlet




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

27

3.7

Gas tanks for biogas

a) Outdoor established membrane gas holder

E 1.3.4.1

Zone 1: air space between

no

with steel casing.

Membrane and steel

Steel casing in the upper container-

wrapping and

range (above the diaphragm) with pressure

1 m to exit

equalizing openings provided, but

fdischarge openings

otherwise technically permanently sealed.

Zone 2: More to 2 m

The membrane being grounded. Your Surface

Austrittsfdischarge openings

resistance is 10 8 Ohm its thickness




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

}

28

3.8

3.9

Gas flares

Gasentschwefler

a) The flashback of the flame in the gas supply line is prevented by a flame arrestor;

b) continuing to flow of gas into the environment with non burning flame is prevented by an automatic shut-off device, in conjunction with self-acting ignition and flame control;

c) In the gas torches with enclosed flame space is ensured that before ignition sufficient Luftsp-ment of the flame space is achieved and that the gas supply is not opened by said ignition-effective.

a) Entschweflern that are opened for maintenance, see 3.4;

b) Entschweflern with added air is the formation of a geA prevented by appropriate control and surveillance of the air supply;

E 3.4.1

E 1.3.1

E 1.3.1

E 1.3.1 E 1.4.2

no

no

no

no

no

no

no

no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

29

c) with a mass Entschweflern which heats during the regeneration itself, the ignition is prevented by Temperatur-monitoring and interruption of the air supply;

d) desulfurizer, which may be a source of ignition, and in which an inflow of geA not excluded. In the Inlets and outlets by flame-failsafe valves are available. Explosion resistant (6 bar).

E 1.3.1

no

no

Zone 1

no

E 3.4.1 E 3.1

3.10 Digester gas-powered machines and gas burners

3.10.1

Affairs von machines and gas burners

Formation of g.e.A. by special design measures to prevent (eg Gasmaschi machines, which meet the requirements of Annex I to Directive 98/37/EC (formerly 89/392/EEC gas burner) and that / the requirements of Annex I of Directive 90/396 EC or the DIN EN 746-2 "Industrial Thermoprozessan documents" match). In the gas line, in front of the institution, is one flame-proof equipment.

E 1.2.1

no

E 3.4.1




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

30

3.10.2

3.11

3.11.1

Environment established in areas of gas engines and burners

Blowers and compressors for fermentation gases

Affairs of fans and Verpoetn

as 3.10.1

Inside, with the formation of a g.e.A. expected by sucking air (eg the vacuum safety).

a) blowers and compressors that the requirements of category 2 of Directive 94/9/EC.

b) fan and compressor do not fully meet the requirements of category 2 of Directive 94/9/EC. Explosion resistant (6 bar). In the inlet and outlet lines flame-failsafe valves are available.

E 1.3.1 E 1.3.4.1 E 1.3.2.1

no no

no

Zone 1

Zone 1

no

no

E 3.1 E 3.4.1




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

31

3.11.2

3.11.3

Environment established in areas of blowers and compressors

Near set up outdoors blowers and compressors

a) Plant technically permanently sealed.

b) Investment technically tight, directed flow of cooling air to the engine against possible exit points.

c) system can not be as close to technically seen. Gas Detector coupled with technical Ventilation.

d) system can not be seen to be technically-tight.

How 3.11.2, but: Outdoors can as a result of weathering rates against similar situations in rooms generally a zone with low Geren requirements set or zones nenausdehnung be reduced.

E 1.3.2.1

E 1.3.2.2 E 1.3.4.1

E 1.4.2 E 1.3.4.2

E 1.3.4.1

no

Zone 2: In the vicinity of each exit point

Zone 2: Whole Space

Zone 1: 1 m to each Exit points

Zone 2: Whole Space

no no

no




(Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5) (Sp. 6)

}

32

3.12

3.13

Pressure regulator for biogas

RoomsWhere sludge is de-watered

a) Gas can leak from defective membrane into a room;

b) as a);

c) as a), but discharge into the open air;

d) in addition to the safety diaphragm Working diaphragm.

The formation of a g.e.A. is not expected.

E 1.3.4.1

E 1.3.4.2

no

E 1.3.1 E 1.3.4.1

E 1.3.4.1

Zone 1: gR Zone 2: 1 m of space

around openings

Zone 2: gR



no

no

no

no no

no

no




(Sp. 6) (Sp.1) (Sp. 2) (Sp. 3) (Sp. 4) (Sp. 5)

33

3.14

3.15

Areas, which is stored in corresponding wsserter sapropel

Sludge dryer and space, is stored in which of dried mud

It with continued gas production to rechnen, unless the sludge is conditioned with lime:

a) Outdoor storage e.g. ( Sludge storage bin or open Container);

b) storing in a container (e.g. silo);

c) as b);

d) storing in a room (e.g., in an Hall);

e) as d).

In sludge drying plants with a g.e.A. likely due to dust.

E 1.3.4.1

E 1.3.4.2

E 1.3.4.1

E 1.3.4.2

no

Zone 1: gR Zone 2: 1 m to openings

Zone 2:

Zone 2 gR:

gR

no

no no

no

no no

Note: Since October 2002 is the BRE rules "health and safety" restructured and provided with new names and part numbers. In coordination with the Main Association of the professional trade association publications were all the categories of "safety regulations", "rules for safety and health," "Information" and "principles" category. In upcoming revisions or reprints the publications to the new names and part numbers are changed. Thereby facilitating a transition period of approximately 3 to 5 years, the new order numbers the previous order number is added. Furthermore, the transition to the new name and numbering of a so-called transfer list are removed, including the is published in the document directory and on the website of the Federation of Accident Insurance (www.unfallkassen.de).

The obligations under Directive 98/34/EC of the European Parliament and of the Council of 22 June 1998 establishing an information procedure in the field of technical standards and regulations (OJ L 204, p 37), as last amended by Directive 98/48/EC of European PARLIAMENT and Council 20th July 1998 (OJ L 217, p 18), have been observed.

Documents

Sample collection means of protection when working in the field of wastewater treatment plants