Heat Treat Furnaces

Lindberg/MPH announced the installation of a roller hearth furnace system for a manufacturer of products used in the energy industry. The heat treat system is comprised of two (2) box furnaces with quench tanks, a dual directional load transfer car, four (4) companion draw batch ovens, and two (2) stationary load/unload tables.

The maximum operating temperature of the box furnaces is 1850°F and they are designed for nitrogen-based atmosphere applications. The load space dimensions of the box furnaces are 48” W x 96” D x 36” H, and the internal chambers are larger to provide clearance for baskets or fixtures. A snake chain pusher assembly is used by each furnace to transfer the loads from the chamber to the quench elevator deck.

The glycol quench tanks are designed for quick and uniform quenching. They feature an immersion oil heater and an externally mounted air-to-quench media heat exchanger. The tanks’ agitation systems include four agitators with draft tubes. A pneumatically operated quench elevator is utilized to transfer the loads into the tanks. The system’s dual-directional pacecar pushes and pulls loads into the auxiliary equipment with a snake chain pusher/puller assembly. The gross load capacity of the car is 10,000 lbs, and it travels linearly in front of the equipment on two embedded floor rails.

Unique features of this roller hearth furnace system include:

• Gross load capacity of 10,000 lbs
• Roller hearth for load transfer
• Snake chain pusher assemblies in box furnaces and pacecar
• Adjustable flow meter calibrated for nitrogen process atmosphere
• Nanodac controller for furnace temperature control and recording
• Eurotherm excess temperature controller to protect from heating over temperature
• Quench elevator with guides to prevent load upsets

#231366 #231368

Lindberg/MPH, a leading manufacturer of heat treat furnaces, announced the shipment of a continuous full muffle mesh belt conveyor furnace to an industrial manufacturer.

This conveyor furnace is designed for applications with a nitrogen atmosphere and a maximum temperature of 1,100°C. Additionally, the furnace has a hydrogen flow meter and combustible gas system so the customer can run a hydrogen atmosphere when needed. The combustible gas system provides a timed nitrogen gas purge of the muffle before process gas can be introduced into the furnace muffle.

The conveyor furnace has overall dimensions of 128” L x 22” W 41.5” H. There are tables at both ends of the furnace for loading and unloading of the product. The unit is designed with four (4) temperature zones and a water-cooling section that parts travel through prior to exiting the chamber.

“This mesh belt conveyor furnace is designed for use with either a nitrogen or hydrogen atmosphere which gives the customer flexibility in their processing options for products.”

– Bill St. Thomas, Business Development Manager

Unique features of this Conveyor Furnace include:

• Four (4) temperature zones
• Designed for either Nitrogen or Hydrogen atmospheres
• Water cooling section
• Mesh belt conveyor system
• Load and unload tables for ease of product transfer

#236219

Lindberg/MPH, a leading manufacturer of heat treat furnaces and nonferrous melting and holding equipment, announced the shipment of three (3) electrically heated, RO pit furnaces with air-cooled fans. The furnaces will be used for heat treating various steel components in a Nitrogen atmosphere.

These heat treating pit furnaces have a maximum temperature rating of 2,000°F and are designed to handle a wide range of part sizes. Two (2) of the units have work chamber dimensions of 28″ diameter x 36″ depth and a maximum gross workload of 2,000 lbs each. The third furnace has work chamber dimensions of 60” diameter x 109” depth and a maximum gross workload of 20,000 lbs.

All of the pit furnaces have pneumatically operated lids with 3-way hand control valves and limit switches that disconnect power to the heating elements when the covers are open. The pit furnaces are electrically heated with heavy duty rod overbend heating elements.

The control systems include Allen Bradley programmable logic controllers with an easy to use touch screen operator interface. Eurotherm high limit controllers are installed on each unit that trigger visual and audible alerts in the event the furnace temperature exceeds the setpoint as well as disconnect the power to the heating elements.

“These pit furnaces are designed for a nitrogen atmosphere and have the combined capacity to process a workload of 24,000 lbs. They have been designed to utilize three independent heating zones for optimal temperature uniformity and meet AMS 2750G Class 3”

-Kelley Shreve, General Manager

Unique features of these RO pit furnaces include:

• Pneumatically operated lid with 3-way hand control valve
• Nitrogen atmosphere capability
• Vacuum formed ceramic fiber modules with low heat storage for rapid heat up rates
• Designed for pit style installation when required
• Heated by heavy gauge rod overbend heating elements
• Programmable temperature controller with easy to us touch screen operator interface
• High limit controller with visual and audible alarms if temperature exceeds setpoint

#23510

Lindberg/MPH announced the shipment of an electrically heated, full muffle, mesh belt conveyor furnace. This furnace is designed for treating pressed powdered material.

The furnace is designed for applications with a maximum process temperature of 1,000° C (1,832° F) that utilize a nitrogen or clean dry filtered air process atmosphere. The unit is configured with 9 temperature control zones and includes a water-cooling section. The conveyor system features a 14 inch wide mesh belt with belt stop alarm to provide an audible and visual indication in case of a conveyor stoppage.

There are purge chambers at the entrance and exit of this conveyor furnace. In these chambers purge gas flows from perforated plenum chambers above and below the belt and exhaust stacks with adjustable butterfly valves are located at the inner ends of each chamber. Load and unload tables at the entrance and exit of the conveyor provide ease of product transfer for the operator.

The furnace zone temperatures are controlled by Eurotherm controllers. These controllers have advanced PID control with variable overshoot inhibition. A hi-limit Eurotherm controller guards against over temperature conditions in each zone of temperature control. A visual and audible alert and removal of power to the heating element occur in the event the monitor temperature exceeds a desired set point.

“This furnace utilizes nine high temperature zones which provides the customer the flexibility for time/temperature profile adjustments to develop and meet their specific process requirements.”

– Bill St. Thomas, Business Development Manager

Unique features of this mesh belt conveyor furnace include:

• Entrance and exit purge chambers
• Furnace muffle
• Eurotherm Model 3216 temperature controller
• Eurotherm Model 3216i hi-limit controller
• Solid state, closed loop, belt drive control
• Zero-Fired solid state relay heating circuit power controllers
• Platinel II thermocouples

#235236

Lindberg/MPH is pleased to announce the shipment of a gas fired cyclone box furnace to the manufacturing industry.

This heat treat furnace has a maximum temperature rating of 1,250°F and a load capacity of 6,000 lbs. It is designed for air atmosphere applications and utilizes a high velocity forced heating system. A circulation fan provides optimum heat distribution by delivering heat evenly throughout the work chamber through high static pressure air flow to assure rapid and uniform heat transfer throughout the workload.

This box furnace is designed to accept fixtures that are 48″ wide by 84″ deep by 48″ high. A full-width roller hearth is located across the furnace chamber floor for manual loading and load support. Temperature is controlled by a Honeywell DC2500 Series controller that includes an adjustable alarm set-point and latching output relay. A Honeywell DC2500 Series high limit controller provides overtemperature protection and disconnects the power to the heating elements and sounds an audible alarm in an event that temperature exceeds desired set-point.

“The high velocity forced heating system circulates heat evenly within the furnace chamber which assures rapid and uniform heat transfer throughout the workload.”

– Bill St. Thomas, Business Development Manager

Unique features of this heat treat box furnace include:

• Programmable temperature controller with adjustable alarm set-point
• High limit controller to prevent temperature from exceeding set-point
• Pneumatically operated vertical lift door
• Heat input of 800,000 Btu/hour
• Maximum gross workload of 6,000lb
• Full width roller hearth for ease of loading

#235178

Lindberg/MPH announced the shipment of one gas-fired Exothermic atmosphere generator to the manufacturing industry.

This exothermic generator features an energy efficient design that provides reliable and economic operation. The unit is equipped with a mixing control system for exothermic gas generation that includes a touchscreen LCD color display and paperless chart recorder. The maximum exothermic gas output for the generator is 1,000 feet cubed (ft³) per hour.

The combustion chamber is designed with a reinforced, water jacketed, steel shell that is insulated with a high temperature refractory lining. The chamber includes UV flame detection and peep sight for observation of main burner operation. There is a fire-check at the burner inlet which will automatically block the mixture line in the event of a backfire. An electrically latched manual reset valve in the gas inlet line will shut down the generator in the event of low gas pressure, high gas pressure, or electric failure.

The atmosphere generator is accompanied by a refrigerant atmosphere gas dryer that has the capacity to cool the generated atmosphere gas to approximately +40°F dew point. The cooling system rapidly cools the generated gas to condense out moisture. It utilizes a 1-HP water-cooled condensing unit with high/low and differential oil pressure safety switches along with a hot gas bypass valve to prevent freeze-up during reduced load conditions.

“Lindberg/MPH’s exothermic gas generator design provides years of trouble-free operation. Prior to shipment, our team factory assembles, pre-wires, and pre-pipes these units to ensure everything meets our quality standards.”

– Bill St. Thomas, Business Development Manager

Unique features of this atmosphere generator include:

• Energy efficient and reliable design for economical operation
• Ethernet communications and data acquisition software
• Regenerative blower with inlet filter and relief valve
• Varying air/gas ratios create atmospheres to meet process specifications
• Lightweight ceramic fiber block insulation
• Completely assembled unit on one base
• Companion gas dryer

#234828

Lindberg/MPH announced the shipment of one gas-fired cyclone pit furnace to the manufacturing industry.

This furnace has a maximum operating temperature of 1400°F and a gross load capacity of 2,750 lbs.

The medium velocity burner and combustion train is estimated at 355,000 BTU/Hr. The load space of this pit furnace is 25” inches in diameter and 36” inches high.

The outer shell is constructed of industrial steel and has an alloy liner backed up with insulating brick as well as block insulation.

Included with this furnace are a set of type “K” thermocouples and it is completely factory assembled, pre-wired, and pre-piped prior to shipment.

“This furnace is an identical duplicate of a unit this customer previously purchased. They trust Lindberg/MPH to provide equipment and solutions and to do so with exacting standards.”

– Bill St. Thomas, Business Development Manager

Unique features of this pit furnace include:

• Manual cover lid lift
• Control panel with temperature and excess temperature control
• Lid limit switch
• 1-Year warranty

#234484

Lindberg/MPH announced the shipment of two electrically heated nitrogen pit furnaces to the manufacturing industry. These furnaces are configured for process applications requiring a maximum furnace temperature of 1250°F in a nitrogen atmosphere.

The load space is 39 inches diameter and 49 inches deep, the chamber is larger and provides clearance for loading baskets and fixtures, and there is a maximum workload of 4,980 lbs.

The outer shell is constructed of heavy gauge steel and is reinforced with structural steel members. The entire shell is supported by heavy gauge steel legs and features refractory lining composed of thermal efficient ceramic fiber insulating modules.

A set of type “K” thermocouples will be installed on the furnace to measure the temperature of the atmosphere before entering the workload. One thermocouple is for the process temperature controller and the other for the high temperature controller.

“These furnaces feature a retort which is structured as a cylindrical shell with a solid bottom. It also includes a sealing trough at the top, that is lined with a gasket, which seals with the furnace cover lid. With this specific furnace, there is a fan that circulates heat and atmosphere evenly throughout the work chamber. The fan is an atmosphere tight sealed, alloy propeller type. We also provided an alloy work support structure that is positioned on the floor of the furnace to support the customer’s workload above the circulating fan.”

– Bill St. Thomas, Business Development Manager

Unique features of these pit furnaces include:

• Steel construction
• Helical coiled nichrome heating elements
• Stainless steel permanent baffle
• Standard Lindberg/MPH design
• Manually adjustable flowmeter
• Eurotherm 3500 series programable temperature controller

#234122