1. 22.14 Quality of galvanizing
a) Galvanizing shall be in accordance to ASTM A 123 7.4.2 and ASTMA 153 8.4.2
b) Minimum thickness of zinc cover shall be 0,05mm
22.15 Quality of painting
a) All painting shall be applied with electrostatic process
b) Paint shall be type EPOXI
c) Paint thickness shall not be less than 0,15 mm
22.16 Hangers and Support Structures
22.16.1General
The Client will provide the primary support structure to support conveyors especially
in the area where conveyors are installed above the ceiling of arrival area and where
conveyors are declining from check in to the baggage hall.
Each fixing attached to the building shall be evaluated and approved by an structural
engineer.
Take special consideration to use correct supports for conveyors due to the special
Building design because of an elevated possibility of seismic activities. In case of an
earthquake event the special supports of the Building foundations will absorb the
major movement of the ground; therefore solid connections between Building
foundation and upper floors are not permitted.
 All equipment fixed to the floor -6,6m is not protected by special shock
absorbers and will receive the full acceleration force up to 400 cm/sec2.
 Relative movement of basement foundation (-6,60m) and building ceiling
(-0,40m) could be up to 0,45m in case of earthquake
 Relative movement of building above the shock absorbers (-0,40m arrivals)
and check in level (+7,60m) could be up to 0,05m in case of earthquake
NOTE
The Client will only provide the primary support structure indicated in the
enclosed drawings; all structure which is necessary additional to operate and
maintain the Systems shall be supplied by the BHS supplier.
The BHS Supplier shall provide as a minimum the following catwalks and
stairs:

2. System A
CAW-AS1
CAW-A1
CAW-A2
CAW-A3
CAW-A4
CAW-A5
CAW-A6
CAW-A7
CAW-A8
System B
CAW-BS1
CAW-B1
CAW-B2
CAW-B3
System C
CAW-C1
CAW-C2
System D
CAW-D1
22.16.2Supports
a) Maximum distance of supports at Conveyors shall be 3000mm maximum centre
22.16.3Support Material
a) All floor supports shall be of standard "H" type design with vertical adjustment of
+/ total of 75mm. Floor support vertical members shall be constructed of #10 gauge,
hot rolled formed steel channel with heavy-duty foot and head plates.
22.16.4Hangers
a) Ceiling hangers of threaded rod shall have a minimum diameter of 20 mm with
structural angle or channel sills. The hangers have provisions for anchoring to the
ceiling structure. Threaded rods shall have: a single washer and a single nut above
and a star type lock washer a single washer and a single nut below the structural
angle.
b) Fixing on concrete ceiling shall be in according to the enclosed drawing :
 EVN-388-BHS-006-00
The threads of the all thread rod shall be:
a) Deformed below the lowest nut to prevent unthreading. This may be accomplished
by using a flat punch and a hammer.

3. b) Cut to within 20mm of the button of the lowest nut (hanger rods). In areas where
operational and/or maintenance personnel have access.
22.16.5Sway bracing
a) All conveyors shall be adequately sway braced in both the lateral and longitudinal
directions as required by local engineering and seismic design codes
22.16.6Access ways
a) Installation and layout of header steel shall not pose interference to maintenance
and operational access, such as clearing jams. All support structure shall be
designed and installed so that maintenance access to conveyor components shall
not be inhibited
22.16.7Anchors
a) Shall be of the Chemical Set or the Expandable Type. Explosive type anchors
shall be not to be used.
22.17 Catwalks
22.17.1General
a) Where catwalks are specified, the conveyor and adjacent catwalks shall be
supported by a common sill.
22.17.2Requirement
a) The enclosed Specification is indicating the minimum necessary catwalks, but
nevertheless the BHS supplier shall provide appropriate catwalks, work platforms
and access ladders for operational access (clearing of jams) and minor
maintenance. Where possible the maintenance access catwalks shall be connected
with catwalk walkways to eliminate the need for ladders at all access points. The
extent of the catwalks, access ways, Bridges, platforms, ladders and swingovers
shall be shown on the Tenderer layout drawings.
22.17.3Design Load
a) The catwalk working live load shall be 146 kg per square meter with a
concentrated load of 227kg in 0.5 square metres.
22.17.4Supports
a) All Catwalks shall be adequately sway braced in both the lateral and longitudinal
directions as required by local engineering and seismic design codes

4. 22.17.5Construction
a) Access ladders and catwalks shall be constructed with a walking surface of 5mm
gauge check plate or web grating with a galvanized or painted finish and if required
painted to clients specification
22.17.6Width
a) Minimum catwalk width shall be nominally 600mm with a 50mm gap between the
catwalk and the conveyor, unless otherwise specified.
22.17.7Surface
a) Level catwalks shall have a grated expanded mesh surface. Therefore inclined
catwalks of up to 8° shall be equipped with an anti skid surface.
22.17.8Inclined Catwalks
a) Catwalks of greater than 8° shall be stepped, as well as equipped with anti skid
surface.
22.17.9Handrails
a) Handrails shall be installed on all platforms and catwalks except on sides adjacent
to conveyors.
22.17.10 Toe Kick
a) Platforms and catwalks shall have 50mm high toe boards except where they might
interfere with access to a conveyor or at any entrance/exit location of the catwalk.
22.17.11 OSHA Standards
a) All platforms, catwalks and ladders shall comply with European Agency for
Safety and Health at Work (EU-OSHA) standards.
22.17.12 Access ways
a) For access to the catwalks ladders shall if possible be located a maximum of 30
meters apart and positioned so as to not hinder traffic lanes or walkways.
22.17.13 Pull-down ladders
a) Pull-down ladders for catwalk access may be used where fixed ladders cannot be
installed due to traffic or staging conditions.

5. 22.17.14 Fixed Vertical Ladders
a) Design of ladders shall meet or exceed OSHA 1910.27.
b) All fixed ladders shall be of steel construction.
c) The distance between rungs shall be no more than 300mm and be uniform
throughout the height of the ladder. All rungs shall have a minimum diameter of
20mm and withstand a 180 kg load when in use. All rungs shall be a minimum of 380
wide. The live loads imposed by personnel occupying the ladder shall be considered
to be concentrated at such points as shall cause the maximum stress in the
structural member being considered.
d) Tenderer shall generally allow a minimum of 100mm between the back of the
ladder and the nearest permanent object. A minimum of 760mm shall be allowed
between the front of the ladder and the nearest permanent object. 380mm shall be
allowed from the center of the ladder to the nearest object on each side. The step
across distance from the nearest ladder edge to the nearest equipment or structure
edge a minimum of 63mm and shall not exceed 300mm.
e) Side rails shall be of such cross section as to afford adequate gripping surface
without sharp edges or burrs.
f) Tenderer shall provide protective guards (i.e., chains) at the top of ladders.
g) Tenderer shall Grind smooth all rough surfaces and edges.
h) All fixed vertical ladders shall be painted in safety yellow.
22.17.15 Ship's Ladders
a) Tenderer shall provide fixed steel ship's ladders to access platforms and
walkways as shown on the contract drawings.
b) Design ladders shall meet or exceed OSHA 1910.27.
c) All ship's ladders shall be of steel construction.
d) Tenderer shall provide steel stringers using minimum 150mm channel. Tenderer
shall design the ladder so that the angle between the stringer and the floor shall not
be less than 60° and not more than 65°. The distance between treads shall be a
maximum of 300mm is uniform throughout the height of the ladder.
e) Handrails shall be fitted to both sides using 32NB tubing.

6. f) Tenderer shall provide protective guards (i.e., chains) at the top of ladders.
g) Tenderer shall Grind smooth all rough surfaces and edges.
h) Tenderer shall paint all ship ladders in safety yellow.