Additional Equipment

VAPORIZERS

CERJET™ CATALYST VAPORIZERS

The CerJet unit generates catalyst gas and heated purge air for use in certain cold box core making processes. In the CerJet liquid catalyst such as methyl formate or dimethylethylamine is vaporized in an electrically heated boiler. The catalyst vapor is then directed to the core machine, followed in sequence by heated purge air as programmed by the user through a supplied PLC. Flow meters assure correct gas and air volumes.

Three models are available with capacities to cure up to 12 tons (10.9 mtons) of chemically bonded sand per hour. Up to eight core machines can be served by a single machine depending upon the capacity and vapor control options specified.

The CerJet catalyst vaporizer has been designed on a modular concept. The modules consist of the boiler, boiler control module and vapor control module. By use of the modular concept, single or multiple-point use can be accommodated quite easily. The CEL-100 model is available as 1 or 2 use-point units, while the CEL-300 is available as a 1 to 4 use-point units, and the CEL-600 model is available as a 1 to 8 use-point vaporizer.

Operation
In operation, liquid catalyst feeds automatically by means of a float switch into the boiler module. It is necessary to feed the boiler module from a bulk storage vessel containing liquid catalyst. The catalyst is heated in the lower portion of the boiler creating a vapor dome in the upper section.

The vapor is conveyed to the vapor control module ( via purchaser-installed heat-traced lines) where it is mixed with heated air and introduced on demand into the mold or core box. As an option on MeF applications, flow meters can be furnished to provide exact ratios of MeF to air for optimum gassing system control.

Controls
The control system consists of a programmable controller, cycle timers, pressure regulators and pressure gauges for system monitoring. By the use of EPROM (Erasable Programmable Read Only Memory) chips (two of which are supplied with the vaporizer), alternate control systems can be introduced into the system's controller memory to produce various types of gassing cycles. Two types include concurrent flow of gas and air and alternating flow of gas and air.

Installation
The CerJet vaporizer is supplied as a freestanding unit with external connection points for liquid feed and vapor takeoff. Interconnection between the boiler module, vapor control module, bulk storage tank, flow meter package and purchaser's core machine is the responsibility of the purchaser. Hydraulic 1/2" steel tubing should be used to interconnect the boiler and the vapor control module. This line should be heat-traced to 130 degrees F. (40C.) to maintain the catalyst in a gaseous state.

Electrical interconnection between the boiler, vapor control module and the core machine (if required) is also the purchaser's responsibility.

Safety
Safety features have been designed into every phase of the CerJet. A three-level float switch prevents under or over filling of the boiler module. Additionally, an overpressure disconnect will shut off the unit electrically and a pressure relief valve is incorporated as a third level of protection on the boiler. The boiler vessel is constructed of stainless steel and is ASME coded.

Upon start-up, compressed air from the vapor control module is used to purge the lines of any residual catalyst. Should boiler pressure become low during operation, due to either a malfunction or an over demand of catalyst gas, an interlock is incorporated into the design of the vaporizer to prevent the core machine from cycling until sufficient catalyst vapor is produced to complete the gassing cycle. Should an overpressure or overfill condition occur, an alarm will sound to alert foundry personnel.

Dependable Foundry Equipment Company can also supply gassing cabinets, lab catalyst vaporizers (Microjet) and tensile test specimen producing equipment. Please feel free to contact your nearest Dependable/Redford-Carver representative or contact us directly for your equipment needs.

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Dependable Foundry Equipment Company - Redford-Carver Foundry Products Company
Divisions of Tromley Industrial Holdings, Inc.