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Title / Describe the operation and control of a glass furnace
Level / 3 / Credits / 20
Purpose / People credited with this unit standard are able to describe the operation and control of a glass furnace.
Classification / Glass and Glazing > Glass Container Manufacturing
Available grade / Achieved
Entry information
Recommended skills and knowledge / Unit 23066, Demonstrate basic knowledge of glass furnace structure and operations; and Unit 18770, Perform analytical tests for batch and glass quality in glass container manufacturing; or demonstrate equivalent knowledge and skills.
Outcomes and evidence requirements
Outcome 1
Describe the operation and control of a glass furnace.
Evidence requirements
1.1Glass furnace heating terminology is described.
Rangeterminology – combustion, perfect (stoichiometric) combustion, incomplete combustion, primary air flue gas analysis, excess oxygen analysis, oxidising flames, radiation, convection, conduction, electro-boost, burners.
1.2Furnace firing methods are identified and their operation described.
Rangemethods – gas and reversals, diesel.
1.3Furnace combustion air flow and exhaust control equipment are identified and their operation described.
Rangeequipment – flues, regenerators, stack, stack-breaker, dampers, electro static precipitator.
1.4Combustion process control parameters are identified, and the methods for controlling them are described.
Rangeprocess control parameters – furnace pressure, flue purging, in-glass temperature, above-glass temperature, in-block temperature, excess oxygen, gas flow, air flow, combustion air, bridgewall optical temperature.
1.5Furnace batch charging control parameters and their purpose are described.
Rangebatch charging control parameters – batch charger speed and oscillation, batch pattern, batch moisture, batch segregation, glass level, bubblers.
Replacement information / This unit standard and unit standard 23068 replaced unit standard 18923.Planned review date / 31 December 2019
Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for AssessmentRegistration / 1 / 20 November 2006 / 31 December 2017
Review / 2 / 16 April 2015 / N/A
Consent and Moderation Requirements (CMR) reference / 0134
This CMR can be accessed at
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and which are assessing against unit standards must engage with the moderation system that applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies to this standard are outlined in the Consent and Moderation Requirements (CMRs). The CMR also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.
Comments on this unit standard
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SSB Code 101571 / New Zealand Qualifications Authority 2018