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MH 27.2 Specifications for Enclosed Track Underhung Cranes and Monorail Systems, an American Standard
As a member of the Monorail Manufacturers of America (MMA) SPANCO, Inc. helped with the engineering effort to develop this standard and today, manufacturer's all of it's Workstation Crane Systems in accordance with MH 27.2.
Click here to download this standard free from MMA.
Enclosed track workstation bridge cranes by SPANCO are offered in either stand alone
workstation bridge crane kits, also known as free standing workstation bridge cranes,
or ceiling mounted workstation bridge crane kits.
Features
Enclosed track workstation bridge crane systems are pre-engineered modular and infinitely
expandable, reduce vertical space and support requirements, and are ergonomically designed
with a 100 to 1 productivity ratio and utilize a self cleaning V-profile design which
maintains alignment of end trucks and trolleys. Bridge cranes have large diameter
polyamide wheels, which are extremely free rolling (steel wheels optional), with steel
guide rollers to prevent end trucks from racking or binding.
All SPANCO systems meet Seismic Zone 4 requirements.
Stand Alone Workstation Bridge Crane Components
Ceiling Mounted Workstation Bridge Crane Components
Easy, ergonomic movement
An operator pushing a 1000 lb. load will experience a force of
approximately 10 lb. to begin moving the load and 8 lb. to continue moving the load
(100 to 1 ratio). Manual cranes also operate more quickly than motorized cranes, making
a workstation bridge crane ideal for fast paced work environments.
 Customization
SPANCO specializes in customized crane design to meet any specific requirements. With a
capable engineering department, SPANCO can customize any standard product or bridge crane
or design a system from the ground up. From 2-D layouts to complete solid models, SPANCO
can create a custom enclosed track workstation bridge crane system design in a timely manner.
Finite Element Analysis (FEA) is utilized to assure that all custom designs meet the highest
standards of safety. SPANCO prides itself on developing creative solutions to customer’s
material handling needs.
In addition to the usual customizations for special heights, spans, and lengths on a bridge
crane, SPANCO can specially design power drives for many models of our enclosed track
workstation bridge crane systems. Special mounting needs can also be met with custom design.
Workstation bridge crane systems can be equipped with lighter weight ALU-TRACK®
bridges. The possibilities are unlimited-SPANCO can design to meet your needs!
Design Factor
Nameplate bridge capacity represents the rated load on the hoist hook. The load rating of
a hoist shall not exceed the bridge rating. SPANCO’s design includes an allowance of 15%
of nameplate capacity for dead weight of the trolley and hoist. An additional allowance of
25% of nameplate capacity is also included for impact.
Service Factor
Workstation bridge cranes are designed for “heavy service” (with standard air hoists or
electric hoists) as defined by the Monorail Manufacturer’s Association (MMA) as defined:
- System or equipment is used where operational time is up to 100% of the work period and
lifted load is at 50% or below rated capacity.
- System or equipment is used where operational time is less than 50% of work period and
lifted load is greater than 50% of rated capacity.
- Applications involving vacuums, magnets, or other high impact lifters are considered
severe usage (continuous service) and require special design considerations. Please contact
factory for special design pricing.
- Consult factory for usage other than moderate and all instances of high cycle rates or
high impact applications such as high-speed air or electric hoists, vacuum lifters, or magnets.
Factory MUST approve ALL such applications.
Protective Packaging
SPANCO workstation bridge cranes are 100% packaged for the best possible paint finish protection
during shipment. All runways and bridges are separated and covered with a layer of microfoam.
Heavy-duty corner boards are applied and then each bundle is passed through a stretch-wrapping
machine. The bundles are then steel banded with wooden skids nailed through the bands for easy
forklift handling.
All SPANCO enclosed track workstation bridge crane components are packed securely in heavy-duty
cardboard cartons and skidded as needed.
Spray paint for touch-up is provided in appropriate quantity, although it is seldom needed because
of the high level of packaging protection.
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