prodSingleMainImgPlchldr Pit Furnaces for atmosphere and direct-fired applications, standard pit furnaces can hold up to 30,000 lbs., reliable furnaces

Pit Furnaces

Pit Furnaces for atmosphere and direct-fired applications, standard pit furnaces can hold up to 30,000 lbs., reliable furnaces
Pit Furnaces for atmosphere and direct-fired applications, standard pit furnaces can hold up to 30,000 lbs., reliable furnaces
Pit Furnaces variety of processes with and without retorts, atmosphere furnace, direct-fired applications furnace, reliable
Pit Furnaces variety of processes with and without retorts, atmosphere furnace, direct-fired applications furnace, reliable
Pit Furnaces variety of processes with and without retorts, atmosphere furnace, direct-fired applications furnace, reliable
Pit Furnaces pre-engineered or custom design furnace, convection, radiation heat transfer, furnace, atmosphere processing
Pit Furnaces pre-engineered or custom design furnace, convection, radiation heat transfer, furnace, atmosphere processing
Pit Furnaces pre-engineered or custom design furnace, convection, radiation heat transfer, furnace, atmosphere processing

If you are looking for a pit furnace, contact Surface Combustion today. Surface® furnaces have a worldwide reputation for providing greater value through an unmatched combination of reliability, repeatability and rugged performance. We will help you determine the optimum solution from our pre-engineered or custom designs for your process, product and material.

Pit Furnaces - Product Description

Surface offers standard pit furnaces based on our years of experience and engineered pit furnaces that are built to your specifications. Our customers rely on us to provide them with reliable, repeatable and rugged systems and equipment to improve the performance and competitiveness of their products. With over 250,000 thermal systems installed worldwide, Surface will partner with you to determine whether a pre-engineered or custom design is best to meet your process, product and material requirements.

Surface pit furnaces are used for a variety of processes with and without retorts. Our pit furnaces are designed be versatile workhorses: they handle both large workpieces and small parts loaded in baskets. We provide designs for atmosphere and direct fired applications. We have manufactured various sizes of pit furnaces for all major industries. Our standard pit furnaces can hold up to 30,000 lbs., range from 24 in. to 120 in. in diameter and are between 36 in. and 144 in. deep. We have built engineered-to-order designs with heavier loadings and larger dimensions such as soaking pits for reheating aluminum and steel billets.

Surface has a well-known reputation for providing solutions that are rugged and built to last. Our furnaces have proven to be extremely reliable due to our robust design practices. We love to hear stories about how furnaces we built over half a century ago are still producing quality work. A big part of that is how we design our casings with heavy plate that is supported large sectioned structural shapes. Steel plate lids assist in saving energy and provides access to lid mounted components. Furnace casings are welded gas tight or are properly gasketed to prevent atmosphere contamination and excess heat loss. Surface understands how casings grow and shrink during the furnace cycles and engineers the right thermal expansion joints into our designs.

Surface will work with you to choose from the latest technology in heating, energy efficiency and controls. Surface understands the difference between convection and radiation heat transfer. For low temperature furnaces, Surface designs the furnace chamber to allow high wind flow from the heat source through the work area using our proprietary high capacity, high temperature alloy fans mounted to the lid or the base. For high temperature applications, we engineer the furnace chamber geometry to provide rapid and uniform radiation heat transfer to the workload. Recuperation, providing added efficiency (up to 29% in some cases), is standard on all gas-fired high temperature furnaces.

Surface pit furnaces can be direct-fired with high velocity burners if the products of combustion provide a suitable atmosphere for the product. Surface provides direct-fired solutions that have high convective flow to provide fast heating and uniform soak temperatures.

For atmosphere processing, Surface is your best partner. Surface has long been known for its expertise in atmosphere processing. Whether the furnace uses RX® endothermic gas, DX® exothermic gas, nitrogen, nitrogen/methanol, nitrogen/hydrogen, ammonia, dissociated ammonia or any other process gas mixture, Surface has the experience and knowhow to provide an effective solution. Our pit furnace designs are used by many heat treaters for carburizing, nitriding and ferritic nitrocarburizing. Process times vary between 2 hour quench and temper cycles, to 40 hour nitriding cycles, to 2-3 week deep case carburizing cycles. Surface atmosphere pit furnaces can be heated by gas-fired radiant tubes or electric resistance heating elements. Our proprietary high temperature fans efficiently distribute the furnace atmosphere through the load for consistent results.

All Surface Combustion batch furnace designs allow for flexibly tailoring each portion of the heat treat cycle: purging, heating, soaking and cooling. Surface batch furnaces are designed to be used for multiple different cycle recipes, allowing one furnace to flexibly perform a diverse range of materials, products and processes.

Our pit furnace lids use our proprietary heat and atmosphere tight door design are hydraulically lifted and rotated to allow top loading by an overhead crane. Depending on your needs, loads may be supported from the bottom of the furnace or hung from the lid. Surface provides a full complement of companion equipment including washers, temper furnaces, gas generators, loading systems and quenches to compete an entire heat treat line. Besides companion equipment, Surface offers advanced controls and support services for single source responsibility. This allows you piece of mind that your installation will run smoothly, and your equipment will be taken care of for the long term.

Standard workspace diameters between 24 in. and 120 in.

Standard loading heights between 36 in. and 144 in.

Standard loading weight up to 30,000 lbs.

Custom size and weights available upon request

Electric, direct gas-fired (recuperative and regenerative), and radiant tube systems available

Maximum operating temperatures of 2400°F

Top or bottom load supports available

Hydraulic cover lift and rotate systems available

Manual or automatic controls meeting the requirements of AMS-2750 can be provided as requested

Companion equipment including washers, temper furnaces, gas generators, loading systems and quenches

Aerospace

Agricultural

Automotive

Bearings

Building & Construction

Commercial Heat Treating

Gear

Hand & Power Tools

Hydraulic

Off Road/Mining/Excavation

Oil & Gas

Ordnance

Plastic/Injection Molding

Sporting Goods

Tool & Die

Wind Power

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Aerospace Components

Aluminum

Bearings

Billet

Brake Components

Carbon

Cast Iron

Casting

Crankshafts

Dies

Extrusion Screws

Fasteners

Forgings

Fuel Injectors

Gears

Gun Barrels

Hand Tools

Large Components

Long Products

Munitions

Pinions

Rod & Bar

Saw Blades

Shafts

Stainless Steels

Steel

Valve Bodies

Partial material and component list shown. Looking for something specfic Contact Us.

Gas Generators

Quenching Systems

Loading System

Trays/Baskets/Fixtures

Air Cool Station

Washers and Dunk Tanks

Companion Quench Tanks

Uni-DRAW® Batch Tempering Furnaces

VacuDraw® Vacuum Tempering Furnaces

Tempering Systems

Partial companion equipment list shown. Looking for something specfic Contact Us.

There are furnaces, and then there are Surface® furnaces

CONTACT US TODAY, and let us show you the Value of Surface™


Ready to Get Started?

Please call us when you are ready to do discuss a new furnace, maintain, upgrade or replace your furnace or any part of your furnace. At Surface, we look forward to helping you with any thermal processing needs.

Call Surface with the following pieces of information ready to initiate your furnace solution.

  • furnace cyclecycle
  • furnace operationoperation
  • hours per yearhours per year
  • available spaceavailable space
  • operating temperature rangeoperating temperature range
  • heat sourceheat source

Give Us A Call

(800) 537-8980

Need Support?

Please call us when you are ready to do discuss a new furnace, maintain, upgrade or replace your furnace or any part of your furnace. At Surface, we look forward to helping you with any thermal processing needs.

For Parts and Service have one or more of the following details regarding your furnace if possible:

  • Serial number
  • Drawing number
  • Photos of your furnace or parts for replacement
  • Spare parts list
  • Furnace rebuild history

Give Us A Call

(800) 537-8980