6 specific areas

8/21/2019 6 Specific Areas

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COURSEFACILITIES LAYOUT TRAINING

LAYOUT OF FACILITY – SPECIFICAREAS

1



FACILITIES LAYOUT TRAINING COURSE

LAYOUT OF FACILITY - SPECIFIC AREAS

• Wellhead area

• Helideck

• Accommodation

• Control room

• Cranes & Lifting equipment / Mechanical handling & access

• Crane study / requirements,

• Lifting Equipment & methods

• Transport ways/routes

• Laydown areas / storage areas

2




WELLHEAD AREA

References:

• Maersk Oil (Qatar), Drilling Department, Specifications toWellhead Platforms

• Total, GS EP SAF 226, Completed Wells, Safety Systems andSafety Rules

• Total, GS EP SAF 021, Layout

• NORSOK L-002, Piping system layout, design and structuralanalysis

• API RP 14E, Design and Installation of Offshore ProductionPlatform Piping Systems,

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WELLHEAD AREA – WELLHEAD & CONDUCTOR

• Maersk Oil Qatar:

• Standard conductor size is 30”(template drilled wells)

• Standard conductor size is 20”(drilling on permanent jacket)

• Largest diameter on wellhead isthat of the NT-2 connector: 283/8” (721 mm)

• The NT-2 connector allows easy

and quick dismantling of the x-mass tree

4




WELLHEAD AREA – WELLHEAD & CONDUCTOR

• Wellhead:

5




WELLHEAD AREA – MOQ NEW WELLHEAD

6

New wellhead + x-mas tree – startup

Multibowl wellhead

with B and C sectionsand valves to these

May also becompleted or modified

with a D sectionwellhead




WELLHEAD AREA – MOQ NEW WELLHEAD

7

Different options withthe new wellhead

system




WELLHEAD AREA – VETCO GRAY COMPACT

8

Vetco Gray compacttree, 5k / 6.5k




WELLHEAD AREA - ARRANGEMENT

Arrangements – circle or row:

• Tripod platforms/monotowers, wells in caison: Circle arrangement

• Conventional 4-legged wellhead platforms: Row arrangement

9




WELLHEAD AREA – CIRCLE ARRANGEMENT

10

6 wells and 2 risers insidea 5 m dia column

15 wells inside a 5 m diacolumn. The trees are staggeredand located on two differentdecks

In this arrangement, min. center-center distance between wells: 1 m– more distance required if larger / higher rated wellhead / X mass




WELLHEAD AREA – ARRANGEMENT IN ROW

11

Arranged in row. Larger x-mass trees (10 K, Drill-Quiptree).

Spacing x-direction: 2.25 m

Spacing y-direction: 2.0 m




WELLHEAD AREA – FREE SPACE REQUIREMENTS

• A “black box” cylinder, dia 38” (965 mm) vertically from cellardeck and through top deck (for drilling purposes).

• Flowline from the specific well may be inside this envelope as it isremoved during drilling/work over.

• Minimum 12” diameter free cylinder from x-mas tree top upthrough to the top deck to allow installation of wireline / CT riser

• Allocate on top deck space (75” x 15”) footprint for CT BOP on topof x-mas tree.

• Sufficient free space around all valve handwheels (min. 5”distance from wheel to structure), also applies to manual master

12




WELLHEAD AREA – FREE SPACE REQUIREMENTS• Coiled tubing BOP frame

13




WELLHEAD AREA – FREE SPACE REQUIREMENTS

• Valves on B- and C-section of wellhead: Space for VR Tool, acylinder Ø 15”, extending 110” from well centerline.

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VR tool




WELLHEAD AREA – MOVEMENTS OF WELLHEADS

• Wellhead and x-mass tree grows vertically when a cold well isstarted.

• This is due to the thermal expansion of the entire productiontubing, and is for example depending on the length of the welland the flowing temperature

• Typically the movement is in the range of 50 – 200 mm; exact

predicted data must be given by the company doing thecompletion.

• Further horizontal movements due to waves: About 25 mm in anydirection.

• Production flowlines will need to follow the movement; i.e.flowlines are subject to imposed displacement

15




WELLHEAD AREA – FLOWLINE FLEXIBILITY

• In the table below is given allowable nozze loads on the wingvalve for two different sizes of Vetco Gray compact trees.

• Also the actual allowable nozzle loads on the production and testmanifolds must be considered.

• Where large vertical movements are foreseen, there must bequite some distance from nearest well to manifold (say 5 – 10 m),and the manifold may be free to rotate.

• Flowlines will often need to be designed with expansion loops.

16




WELLHEAD AREA – FLOWLINE FLEXIBILITY

• .

17




WELLHEAD AREA – FLOWLINE EROSION

• Ref. To API RP 14E, sec. 5

• Where erosion may be a problem due

to solids in flow, use flow Tee (Targettee) as first bend after choke.

18




WELLHEAD AREA – FLOWLINE EROSION

• Alternative to flow Tee – 3 Dia LRbend.

• Choke valves installed to permit easyremoval and trim changes

• Downstream flow passage within tennominal pipe diameters should be free

of abrupt changes in direction tominimize flow cutting due to highvelocity.

19Also refer to NORSOK L-002




WELLHEAD AREA – PIPING DESIGN

• Design with double-block-and-bleed (DBB) on manifolds. A twinplug valve will have same face-to-face dimension as a ball valve.

• Design with swab-over spool for easy change from producer toinjector.

20




WELLHEAD AREA – NORSOK L-002 RECOMMENDATIONS

• Well spacing, min. 2.5 m

• Manifolds with flanges or clamp connectors at each end for

cleaning and future expansion purposes.

• Long radius bends or flow Tee / Target Tee to be used betweenchoke and manifold.

21




WELLHEAD AREA – DRILLING ACCESS• The top deck equipment shall allow the jack-up rig’s cantilever to

have access.

• It must be possible to reach all wells from one position of the

jack-up rig (drilling envelope); i.e. the rig must not be moved toreach specific wells

• Drilling access is designed to some specific rigs, and drillingaccess drawings are prepared before new rigs are brought in.

22




WELLHEAD AREA – DRILLING ACCESS• (S+P+L) = 49 – 50 m for some of the listed drill rigs (North Sea)

but may be smaller in other regions. See specific rigs.

23




WELLHEAD AREA – DRILLING ACCESS

• The top deck equipment should maximum be 28 m above meansea level, to allow the jack-up rig’s cantilever to have access.

• It must be possible to reach all wells from one position of the jack-up rig; i.e. the rig must not be moved to reach specific wells

• Drilling access is designed to some specific rigs, and drillingaccess drawings are prepared before new rigs are brought in.

24

Typical drilling

envelope:

39 ft x 24 ft




WELLHEAD AREA – WELL SERVICE ACCESS• The top deck should contain

hatches for access to x-mass trees

• Three hatches “inside each others”,one 3000 mm, one 1000 mm andone 300 mm.

• Often only made with 3 m x 3 m

square and then circular Ø 300 mmhatches inside the large squarehatch

• Ø 300 hatches above each x-mass

tree

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WELLHEAD AREA – WELL SERVICE EQUIPMENT• The top deck must be sufficient in size to contain the equipment

(wire line, light coiled tubing or heavy coiled tubing).

• Must be designed for most heavy part (typically the CT reel)

• Standard coiled tubing reel (2”), weight 30 tonnes @ max 1.5 mwaves (H1/3), 15 m from boat landing

• Heavy coiled tubing reel (2 3/8”), weight 60 tonnes, foot print 2.5m x 7 m. Tubing being spooled onboard +Tank, 60 tons (4 m x 4m footprint)

• Design deck load min. 20 kN/m2 on working area of min. 20 m x20 m.

• Further space is required for CT control container, pumps, tanks,depending on the job type

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HELIDECK – D-MEASURE AND HELICOPTERS• Ref. CAP 437

• D-measure and design

load is characteristicsof helideck

• Restricted zones areshown here.

• 210°obstacle freezone

• 150°limited obstaclesunder an angle 2:1

(30 deg).

27




HELIDECK – OBSTRUCTION FREE AREAS• Ref. CAP 437

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HELIDECK – D-MEASURE AND HELICOPTERS

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HELIDECK – MARKING

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• Ref. CAP 437

• Marking with “H”,

installation name,allowable load and D-measure

• Sizes of letters and

colours as given inCAP 437 / ICAO

• Perimeter lights,including colours, are

stated in CAP 437.• Note the “Chevron

mark” giving the 210degr. sector

•

• Min. 2 escape routes so it for allwind directions is possible to escapeagainst the wind




HELIDECK – RESCUE & FIRE FIGHTING• Helicopter crash equipment container with specified content

• 3 foam monitors, rather equally distributed around the periferi ofthe deck - or DIFFS (Deck Integrated System)

• 2 x foam hose reels

• Min 45 kg dry powder from 1 or 2 units with hoses and nozzles

• Min 18 kg CO2

from 1 or 2 units

31




HELIDECK – RESCUE & FIRE FIGHTING• DIFFS (Deck Integrated Foam Forming System) with pop-up

nozzles

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Fire water demand: 6 l/min/m2based on D-measure.

Pressure: Min. 6.5 barg

(same requirements for monitors)

http://www.youtube.com/watch?v=QyYC6RC2duo




ACCOMMODATION

References:

• Maersk Oil, MODES 01, Safety Design

• Maersk Oil, MODES 08, Accommodation Facilities

• NORSOK C-001, Living Quarter Area

• Shell DEP 37.17.10.10, Design of offshore living quarters

• Shell DEP 30.00.60.15, Human Factors Engineering – ControlRoom Design

33




ACCOMMODATION• Located on safest place on the

installation

• Isolated from fuel sources –greatest extend possible

• Fire wall or adequate spacing

• No risers underneath

• Minimize windows facingproduction

• Noise & Vibrations

• HVAC with F&G• Provide quick and easy escape

– at least two independentroutes

34




ACCOMMODATIONOverall goals

• To provide an area where the POB shall be protected from harm,weather, noise and vibration.

• To provide a standard of accommodation balanced with theduration and regularity with which persons are required to resideon offshore installations

• To provide auxiliary spaces to facilitate the operationalrequirements of the installation.

• To achieve the optimum use of space and weight in terms of livingconditions and cost effective layout through appropriate functional

suitability, aesthetic appearance and coordinated interiorarrangements.

35




ACCOMMODATIONSpecific goals

• Provide design brief with requirements and the basis of design

• Provide adequate spaces to fulfil welfare needs in terms of areasfor

• Sleeping and resting

• Personal hygiene

• Catering and dining

• Laundry

• Recreation and leisure

• Medical facilities

• To provide adequate areas, where required, for management andcontrol functions

36




ACCOMMODATIONSpecific goals (continued)

• To provide good access arrangements between all areas thatpersonnel may require to use in both normal and emergency

conditions

• To provide adequate space for utility services and equipment thatare required to be located within the LQ

• To make provision in the design for utility services that makecost-effective use of space and interface efficiently with plannedor existing platform utility services

37




ACCOMMODATIONData / Philosophies / Strategies – early stage

• type of installation;

• personnel capacity;

• manning philosophy for all main operational phases;

• catering philosophy;

• CCR philosophy (if applicable);

• environmental data on location;

• design life;

• helicopter type(s) and operational philosophy;

• main evacuation philosophy;

38




ACCOMMODATIONData / Philosophies / Strategies – early stage

• lifeboat capacity and number;

• workshop area requirements (if applicable);

• waste handling philosophy;

• housekeeping (cleaning) philosophy.

39




ACCOMMODATIONLQ Area Room Programme – NORSOK C-001, Annex A:

40




ACCOMMODATIONAllocation of offices – Shell guidelines – part 1:

41




ACCOMMODATIONAllocation of offices – Shell guidelines – part 2:

42



Day/Night shift (Back to Back) can be

sized for 2 persons (only 1 at the time)

Other cabins only 1 person during

normal manning

Provisions for Bunk beds

Bed spaces is always and issue !

Capacity:

Design for maximum POB

Consider periods for increased manning

Future requirements ?


ACCOMMODATION

43




ACCOMMODATION

Access and Layout

• Areas with more than 5 persons shall have at least two exits

situated as far apart as possible (MODES 01)

• Minimum door dimensions 2m * 0.8m

• Stretcher

• Medical room in vicinity to ERT

NORSOK C-001

Rooms exceeding 20 m2

44




ACCOMMODATION

Main Accommodation area -

Typical rooms/spaces

• Cabins with Shower & toilet

• Canteen, galley, food store,refrigerator rooms, freezer,waste disposal

• Offices

• Leisure & Recreation

• Laundry & Linen room

• Medical room

• Chapel / Prayer Room

• TR (Depending on design)

45




ACCOMMODATION

Access and Layout

• Cabin area as per NORSOK C-001

• Single 6 m2 incl. bath

• Double 12 m2 incl. bath

• Bed min. 2100 mm * 800 mm

• Shower 0.65 m2

• Shower min width (centre) 700 mm

BF Accommodation46




ACCOMMODATIONAccess and Layout – Shell proposal for 2 x 2 persons cabin:

BF Accommodation47




ACCOMMODATIONAccess and Layout – South Arne/DK. Single rooms

BF Accommodation48

Note that each room has window

C S O G CO S




ACCOMMODATION

Access and Layout

• Cabins to be grouped in areas or corridors (Private Domain)

• Linen store on each floor (all cabin levels)

• Cleaner’s store on all main floor levels

• Cabin to have unobstructed access to corridor leading to

minimum two independent escape routes

BF Accommodation49





ACCOMMODATION

AD Level 3

50





ACCOMMODATION

Access and Layout

• Recreation areas, not less than 1.5 m2 per bed (NORSOK)

• As appropriate

• TV lounge

• Coffee bar

• Activity room

• Gym

• Grouped together

BF Quiet room51





ACCOMMODATION

AD Level 252





ACCOMMODATION

AD Level 253





ACCOMMODATION

BF Level 154





ACCOMMODATION

Access and Layout

• Dinning room

• 1.2 m2 per person for approx. 50% POB

• Near Galley and serving area

BF Accommodation55





ACCOMMODATION

AD Level 256





ACCOMMODATION

AD Level 2

A0 Shutter

B15 wall

A0 Cladding wall

A60 wall

A60 wall

57





ACCOMMODATION

BF Level 258





ACCOMMODATION

Access and Layout

• LQ Laydown area

• Waste handling

• Containers

• Access

• To Provision store

• To General Provision

BF Accommodation59





ACCOMMODATION

Access and Layout

• LQ storage area

• Provision stores

• Cold Storage

• Freezer

• Main store

• Linen store -Each floor with cabins

• Cleaner’s store – Each floor

BF Accommodation60




ACCOMMODATION

BF AccommodationAD Level 261




ACCOMMODATION

BF AccommodationSA Level 162




ACCOMMODATIONWorking area in relation to

acc.

• Central Control Room – Seeseparate section

• Telecommunications & RadioRoom

• Workshops & Stores

• Laboratories

• Offices

• Changing rooms(male/female)

• ERT storage room

63




ACCOMMODATIONUtility area in relation to acc.

• Plant rooms – Elec., battery, emergency gen.

• Potable water• HVAC & air treatment

• Firewater pumps

• Sewage treatment

Noise & Vibrations

Diesel with subsequent risk of fire and smoke

development

64




ACCOMMODATIONFor estimates +/- 25%. Weight of LQ versus POB

65Ref. Shell DEP 37.17.10.10-Gen




ACCOMMODATIONFor estimates +/- 25%. Area of LQ versus POB

66Ref. Shell DEP 37.17.10.10-Gen




CONTROL ROOMStandards / Guidelines as reference:

• NORSOK S-002, Working Environment

• OGP Report 454, Human Factors engineering in projects

• ISO 11064 (1 to 3), Ergonomic design of control centres

67




CONTROL ROOM - REQUIREMENTS• Located at a location as safe as possible, away from the work

areas (utility, process) – in non-classified area.

• Integrated platforms: In or adjacent to accommodation

• Bridge connected platforms: Where safely and functionally

• Well protected against all dimensioning hazards

• No doors directly from work area to CCR

• Toilet located in vicinity (few meters from CCR)

• Space for future expansion (control stations, desks, etc.) – 25%spare space for future 20 years

• Low noise level (< 50 dB) – well protected against vibrations

• Light level: 500 LUX

68

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM REQUIREMENTS



CONTROL ROOM - REQUIREMENTS

• Some companies require windows in CCR with “human factor” asargument – this is requirement in NORSOK

• Integrated with maritime control room / telecom room

• Windows at the side of control desk

• Guide (Shell): 9 – 15 m2 per control station

• Good access to

• Supporting facilities incl. production supervisor office

• Production areas

• Emergency escape routes + life boats

• Provided with – or in vicinity of:

• Work permit administration system/facilities

69

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM DESIGN STEPS ISO 11064 2



CONTROL ROOM – DESIGN STEPS, ISO 11064-2

70

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM DESIGN ISO 11064 3



CONTROL ROOM – DESIGN, ISO 11064-3

71

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM DESIGN ISO 11064 3



CONTROL ROOM – DESIGN, ISO 11064-3

72

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM EXAMPLE LOCATION



CONTROL ROOM – EXAMPLE, LOCATION

73

Note:

Blast wall from

process areaand swith gearroom asadditionalbarrier

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM – EXAMPLE LAYOUT



CONTROL ROOM – EXAMPLE, LAYOUT

74

(49:F&GMatrix

Copier and

printer insame roomis not bestpractice)

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM – SHELL GUIDELINE



CONTROL ROOM – SHELL GUIDELINE

75

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM – SHELL GUIDELINE



CONTROL ROOM SHELL GUIDELINE

76

LAYOUT OF FACILITY - SPECIFIC AREASCONTROL ROOM – BAD DESIGN



CONTROL ROOM BAD DESIGN

77

• Usual office desks does not give enough space for monitors

• Printers etc. located under the desks and obstruct legs of operator

LAYOUT OF FACILITY - SPECIFIC AREASCRANES & LIFTING EQUIPMENT



CRANES & LIFTING EQUIPMENT• Mechanical Handling Philosophy

• Crane Study & Crane requirements

• Lifting equipment and methods

• Mechanical Handling Study / Mechanical Handling Plan

• Access / clearance requirements

• Transport ways / routes• Laydown areas

78

CRANES & LIFTING EQUIPMENTMECHANICAL HANDLING PHILOSOPHY



MECHANICAL HANDLING PHILOSOPHY• Strategy for use of permanent means versus temporary / portable

• Parameters / criteria: How often, how heavy

79




• Another strategy (NORSOK R-002, table B.1)

80




Further the strategy must define:

• Main mechanical handling equipment available (incl. Crane)

• Description of main transport routes incl. design criteria

• Lifting restrictions, philosophy for lifting above process area

• Weather constraints

• Definition of largest / heaviest item to be handled per area anddescription of transportation route and handling equipment

• Requirements for dropped object protection and swinging loadprotection (crashbars, bumpers)

• Description of goods handled to/from helideck

• Load categories for mono rails, hoists and pad eyes.

81

CRANES & LIFTING EQUIPMENTCRANE STUDY



• Basis for location of cranes and crane boom rests

• Visibility to laydown areas

• Description of handling with main cranes to/from supply boat and

internally on topside

• Listing of most common lifting operations and frequency of these

• Description of max allowable lifting heights, coverage and

restrictions.

• Personnel transport? (MOB boat, personnel basket)

• Lifting requirements including well service equipment

• Sketch: Minimum radius and max. radius for heaviest lift

• Strategy for changing hook (re-reeving) and wire change out

82

CRANES & LIFTING EQUIPMENTCRANE LOCATION / SUPPLY BOAT APPOACH



• Supply boat approach on blow-off side (or prevailing wind parallelto the side being lifted from)

• No lifting over riser / pipelines

• Full visibility from crane cabin to supply boat

• Need for more cranes on same platform?

• Need for ”take-over” laydown area

83

Wind

Wind

CRANES & LIFTING EQUIPMENTCRANE STUDY / CRANE REQUIREMENTS



• Design: EN 13852-1, Offshore Cranes

• Max/min radius, SWL@radius,

• Offshore lifts: Max. Load/radius/wave height (typically 2.5 - 4 m)

• Approval/design for manriding?

• Additional brake on winches

• Emergency power/pumping system

• Need to rotate more than 360°?

• Mechanical & structural classification (F.E.M)

• Zone/EX requirements (incl. Zone 2 kit on engine)?

84

CRANES & LIFTING EQUIPMENTCRANE STUDY / CRANE REQUIREMENTS



85

Example of real cranelifting curves

CRANES & LIFTING EQUIPMENTLIFTING EQUIPMENT & METHODS



86

Offshore craneTraversecrane

Monorailcrane

Beam clamp

Lever hoist

Chain hoist

Chain sling Polyester roundsling

CRANES & LIFTING EQUIPMENTLIFTING EQUIPMENT & TRANSPORT METHODS



87

Sack truck Pallet truck Turnable truck Mobile cantilever hoist

Tripod Pneumatic liftingbag

Hydraulic jacks Roller skates

CRANES & LIFTING EQUIPMENTLIFTING EQUIPMENT & TRANSPORT METHODS



88

Access by absailorSkidding systemHelicopter – here liftingone out of 3 parts of acrane boom.

CRANES & LIFTING EQUIPMENTMECHANICAL HANDLING STUDY



• A detailed plan for all items, requiring the plan (ref. Strategy):

89

CRANES & LIFTING EQUIPMENTMECHANICAL HANDLING STUDY

h l l d hd l h dl



The plan must also adress withdrawal areas & handling:

• Seawater lift pumps

• S&T heat exchanger - tube bundle (required pulling points?)

• Plate heat exchanger – plate pack

• Centrifugal compressor – bundle / aero assy

• Multistage centrifugal pumps – cartridge

• Pig launchers / receivers – pig handling and space requirements

90

It may be required to

design with a gantrycrane or runway beamover equipment insidemodules

CRANES & LIFTING EQUIPMENTMECHANICAL HANDLING STUDYR b l d d ( il i i



Runway beam plans are produced (some oil companies require”Mechanical Handling Layout Drawings”):

91

Also address foreach handling

equipment, howit must be loadtested duringre-certification

(need for “floating load”

CRANES & LIFTING EQUIPMENTMECHANICAL HANDLING STUDYE l ”M h i l H dli L t D i ”



Example: ”Mechanical Handling Layout Drawing”:

92

CRANES & LIFTING EQUIPMENTMECHANICAL HANDLING STUDY• The tables are supported by plots from a 3D model study and



• The tables are supported by plots from a 3D model study, andsketches to show the lifting/handling:

93

CRANES & LIFTING EQUIPMENTTRANSPORT WAYS / ROUTES• Must be sized to allow transportation of largest/heaviest item to



• Must be sized to allow transportation of largest/heaviest item tobe handled from its position to the actual lay down area.

• No steps or tresholds on transport ways

• Consider any special transport remidies (fork lift, pallet lifter, etc)

• Transport to mech. Workshop must be possible for items inquestion.

• A goods elevator should be considered for transport betweenlevels

• Transportation both horizontally and vertically must beconsidered.

94

CRANES & LIFTING EQUIPMENTLAYDOWN AREAS / STORAGE AREAS• Preferably at periphery preferably in unclassified areas



• Preferably at periphery, preferably in unclassified areas

• Preferable be visible from the crane

• If more than one crane, a laydown area for ”take-over”

• Laydown area for accomodation containers

• Laydown area for tote tanks (chemicals, etc.). Far fromaccomodation

• Laydown area for containers generally

• Laydown area / deck space for well service equipment

• Laydown area for ”service containers” + equipment for backload

• Laydown areas must be available on each level of the p/f

• Laydown areas not too near crane pedestal (minimum Radius!!)

95

CRANES & LIFTING EQUIPMENTLAYDOWN AREAS / STORAGE AREAS• Must be designed for anticipated max load (kg/m2)



• Must be designed for anticipated max load (kg/m )

• Allowable deck loads to be shown in load plans

96

CRANES & LIFTING EQUIPMENTLAYDOWN AREAS / STORAGE AREAS• Storage areas should be near to appropriate laydown area and on



• Storage areas should be near to appropriate laydown area and onsame level.

• Separate storage area for accomodation / catering

• Storage of chemical tanks and tanks with flammable liquids faraway from accomodation and service areas.

• A dedicated area should be designed for scaffolding

• A permanent storage area for mechanical workshop andmechanical equipment (near workshop)

97

ED

platformscaffoldareas

THANK YOU



98

6 specific areas

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