2.2.10.1
Design
Operator's cab shall be designed and constructed in accordance with [CMAA 70
] [CMAA 74] and ASME B30.2. Location of cab access shall be easily
accessed by crane operator. Cab shall have space near cab entrance for
storage of a carbon-dioxide, dry chemical, or equivalent hand fire
extinguisher.
2.2.10.2
Cab Construction
Cab shall be [fixed cab mounted on bridge] [trolley mounted cab] of the
[enclosed] [open] type for [outdoor] [indoor] use, and designed to provide
a clear view of the operating floor and hook for operator. Cab shall be
provided with a suitable [heating] [heating and air conditioning] unit.
Cab shall be located on the [_____] of the [bridge] [trolley] with the
operator facing [_____].
2.2.11
Additional Provisions for Outside Service
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NOTE: This paragraph is applicable for outdoor
cranes only.
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Welded structural members on outdoor cranes shall be seal welded. Crane
bridges shall be provided with parking brakes which will sufficiently hold
the crane against a wind pressure of 244 Pa 5 psf for in-service
conditions. Crane bridges shall be provided with manually-operated pin
locks at each rail, designed to securely anchor the crane against a wind
pressure of 1.5 kPa 30 psf for out-of-service conditions.
2.3
MECHANICAL EQUIPMENT
2.3.1
Drives
2.3.1.1
[Bridge] [Gantry] Drives
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NOTE: If the span is less than 12 m (40 feet) and
the application is MHI CMAA Class "A" or "B", then
A-1 drive may be included as an option.
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[Bridge] [Gantry] drives shall be [either the A-1 or] [A-4] drive
arrangement as specified in CMAA 70 or CMAA 74. Bridge drive shall consist
of a single electric motor mechanically connected through gear reduction
and drive shafts to the drive wheels or separate drive motors at each end
of bridge. Acceleration and deceleration shall meet the requirements
specified in this section. Gears shall conform to applicable AGMA
standards. Gear reducers shall be oil tight and fully enclosed with
pressure or splash type lubrication. Bridge-travel limit-switches are
optional.
2.3.1.2
Trolley Drives
Trolley shall be complete with a drive arrangement with a minimum of two
wheels driven by an integral electric motor. Drive mechanism shall run in
totally enclosed oil bath. Limit switches are optional for drive
SECTION 14630A
Page 20
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