HVLC Systems

SKU: C-731Duration: 29 Minutes Certificate Included

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.

Great for in-person classroom training or as an alternative to DVD.

Includes printable documents and Convergence Video Player for Windows systems. Content expires after 1 year.

Ideal for corporate licensing and volume users who also need administrative tracking and reporting on training.

Get this interactive eLearning course into your LMS or learn how you can leverage our LMS to deliver training to your workforce.

Need multiple courses or have lots of users? Just let us know a little more about what you need and we’ll get you some great volume pricing.

 Need help deciding? Compare delivery formats.

Course Details


Training Time: 29 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Non-condensable gases, or NCGs, are a by-product of the kraft pulping process. NCGs are toxic, foul-smelling and potentially explosive. In the distant past, these gases were largely discharged directly to the atmosphere. This is no longer allowed. The purpose of an NCG system is to collect, condition, and safely deliver these gases to a location within the mill where they are disposed of by incineration. This module will focus primarily on the DNCG type collection system. Dilute systems are also referred to as high volume low concentration (HVLC) systems.

At the end of this module, you will be able to:

  • State the purpose of an HVLC system
  • Describe the makeup of a typical dilute non- condensable gas stream
  • Differentiate between the two methods used to safely convey NCGs
  • Identify and describe the major equipment and components of an HVLC system
  • List the conditions needed for incineration of NCGs
  • List the possible NCG incineration locations within a mill
  • Identify and describe safety hazards and safety design features of an HVLC system

The following key questions are answered in this module:

What is the lower explosive limit (LEL) of a flammable gas and air mixture?
The lower explosive limit is the gas to air ratio below which the mixture will not burn.

What are NCGs?
NCGs are Non-Condensable gases. They are compounds which have boiling points above the temperature of most mill water cooling systems.

How are the gases from HVLC systems typically disposed of?
HVLC gases are usually incinerated in a boiler or kiln within a mill.

What is flame speed?
Flame speed is the rate at which a front will propagate through a flammable mixture.

What is the primary technique used to keep HVLC systems safe?
Gas mixtures in an HVLC system are kept below the lower explosive limits.

Below is a transcript of the video sample provided for this module:

Before the collected NCGs flow through the fan, they usually flow through a cooler and mist eliminator. The purpose of the NCG condenser is to remove water and condensable organics from the NCGs. This reduces the volume of gas going through the fan and onto the incineration point. This leads to more consistent burning. Removing water from the gas stream also makes it less corrosive to downstream equipment. The condenser is typically a shell and tube heat exchanger with the NCGs on the tube side. As the gases inside the tubes cool, water vapor in the NCGs condenses out as liquid water. That condensate is sent to a foul condensate collection tank.

Use the additional resources and links below to learn more about this topic:

Customer Q&A

Ask a Question

Sorry, we're missing some information

How do I log in to watch a video that I have already paid for?

Easy! Moments after you purchase your pay-per-view (PPV) course, you'll receive an email with login details. Just click the link and log in with your user name and password and you're on your way!

I would like to have some of my employees take 5 of your driving related courses, how can i set this up?

We're in the process of making bulk purchases and purchases for multiple users easier. But for now, you can order multiple courses and just let us know who you'd like to assign courses to. With an email for each user, we can set up their training plans and make sure everyone gets the eLearning assignments they need.

How can I get your paper-making courses for free?

Well, we can't blame you for asking... And while we're a for-profit company, there are situations with students and certain educational organizations where we can help out with a selection of eLearning. However, our online courses are extremely economical. And our paper industry courses are in very high demand. So, without knowing more about your situation, we think you'll get loads of value from the $39 you'll spend on any of our premium courses.

Do you have eLearning in Portuguese?

Yes, we do! And in addition to primary English narration, we produce many courses in a growing number of languages, including Spanish, Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Russian, Tamil, and Thai.

I'm unemployed, but I really like your eLearning. Do I get a certificate when I complete a course?

Yes! All of our courses allow you to print a completion certficate upon successfully passing the integrated test at the end of eLearning. In the future, we'll have badges for you to use in your LinkedIn profiles.
Added to Cart! Click here to view your cart.