STANMEK INGENIEURS SPECIAL PURPOSE CRANES
Cranes specifically engineered for: High duty cycles, continuo loads, high temperatures, hot metal handling, catic & corrosive environments
At STANMEK, our engineers take great pride in their ability to provide ctomers with the crane that best meets the requirements of their application. Many times it takes only a small modification of a standard configuration to make a great improvement in the crane's performance for a particular job. Other times, it has proven best to ctom design the complete handling system to achieve the desired results.
Our engineers have designed hundreds of ctom cranes and the one thing all of these ctom installations have in common is a satisfied ctomer. Your application may benefit from a ctom designed crane from STANMEK Indtries
High Duty Cycles
Class "D" Cranes provide a much longer operational life, lower maintenance costs and greatly reduced down time. The initial expense of upgrading from a Class "C" to a Class "D" crane is quickly recouped.
CMAA sets the standards
The Crane Manufacturer Association of America (CMAA) has issued over 150 pages of specifications detailing how to design and build cranes of differing classes. An extensive list of more than 50 crane components (wheels, bearings, motors, axles, " contactors, etc.) are "upsized" for each successive crane class. Crane duty classifications are strictly regulated by the CMAA and mt be documented by engineering calculations. The perception that crane classifications are merely a marketing gimmick is false.
What is a "Heavy Duty" application?
Class "C" applications can be accommodated with either a Class "C" or a Class "D" crane. Buying a Class "D" crane for a class "C" application will extend the crane's operational life (lasting up to 40 years), result in minimized maintenance, virtually no down time, and will significantly improve margins of safety.
Consider what the CMAA specifications dictate for cranes of equal lifting capacity but different classifications. Class "D" Cranes, as compared to Class "C" cranes, are designed to:
Overhead lifting systems are ed in virtually every indtry and in an unlimited variety of applications. Often, an "under the hook" device such as a ladle, magnet, spreader beam, counter-balanced C-hook, etc. is required. Such a device has a major impact on the selection of the hoist with regard to safety, performance, reliability, and maintenance, and mt be taken into account by the crane/hoist manufacturer.
A device which will be permanently carried by the hoist (8 or more hours at a time) constitutes a "continuo load" and requires special considerations. All hoists are designed for intermittent loading which means that during normal operation the hook will, at times, be raised & lowered without any load. Doing so allows the mechanical load brake within the hoist gearbox to self lubricate, th, prolonging its life and insuring the safety of the hoist. When the hoist has a permanent load, the mechanical load brake will wear prematurely and fail. This can cae a "trickle down" failure of the secondary braking system on the hoist (the holding brake attached to the motor) which can leave the hoist with no brakes at all!
There are a number of solutions offered by hoist manufacturers which allow hoists to operate under continuo loads without any threat to the braking systems. Each solution varies a bit on price, lifting speed(s) & control, however, they all eliminate the mechanical load brake within the hoist gearbox. Among the more common solutions:
Some cranes are forced to work in very hot areas, such as foundries or heat treating plants. A few important "upgrades" can eliminate most maintenance problems and add 10 years to the life of a crane.
What is "Hot"?
The important consideration is not the temperature at the source of heat, but rather the temperature of the air immediately surrounding the crane components, such as the hoist, bridge motors, control panels, and electrification system. A careful analysis is required to determine which parts of the crane will operate in prolonged periods of high temperatures. A standard crane will operate without problem up to 95 degrees Fahrenheit, or in a typical factory, not air-conditioned and subject to normal summer temperatures.
High air temperatures cause electrical components and motors to fail much quicker. This is because heat is a by-product of electrical current. Under cooler operating conditions, this heat is quickly dissipated, but high ambient temperatures slow down heat dissipation, causing major maintenance problems.
High operating temperatures and poor heat dissipation cause the oil on a crane to break down prematurely, requiring frequent oil changes or reducing the life of gears and drives.
Hot Metal Handling
Cranes carrying hot metal have many additional safety considerations, and code-mandated requirements.
If your crane is carrying hot metal, it may be subject to additional requirements beyond those laid out in CMAA (Crane Manufacturers Association of America), OSHA, and NEC (National Electrical Code) specifications. The Foundryman's Code outlines additional provisions for hot metal hoists and trolleys. A customer, in conjunction with their safety committee, insurance company, and local regulators, must decide if a Foundryman's hot metal hoist is required.
A Hot Metal Hoist and Trolley include:
Catic & Corrosive Environments
A crane specially designed for caustic environments will last decades longer than a standard crane, and will have dramatically less maintenance and down time.
Some cranes must operate in caustic and corrosive environments such as plating lines, galvanizing facilities, or other open tank chemical processes. In these situations, a standard crane will work -for a while. Maintenance is very high, and crane life short.
Corrosion and Rust Problems
Standard steel components rust and break down when exposed to caustic fumes and liquids. By either substituting chemical-resistant materials for standard steel or applying protective coatings to the crane, the corrosive effects of the caustic agents can be minimized.