Valve Bag Insulation : Why You Should Consider It

Apr 30, 2020 | Energy Optimization

Insulation is not exactly an earth shattering concept. It’s low tech, easy to employ, and a significant ROI can be achieved.

Unfortunately, insulation is often overlooked by companies, for a vast array of reasons.

That’s a shame, because a well-managed insulation project can bring significant savings to the table. Check the numbers from the latest project we carried out:

Valves Insulated 455
Savings (in kWh 4 109 743
Savings €82 195
ROI 0.21 Years

So let’s look at the different reasons companies don’t usually consider these projects, and what they can bring.

Insulation is usually low priority

The majority of industrial settings use steam and hot water throughout their respected process.

These processes’ main objective is output / production throughput. Maintenance teams servicing these processes are tasked to keep the systems up and running at all costs, with as little downtime as possible.

Taking this into consideration, you can’t blame maintenance teams for rating insulation as a low priority. They often have more important tasks to complete.

Demonstrating Insulation Savings is Hard

The savings are there, no one can deny that, its physics, but it is often a challenge to demonstrate these savings.

If you go looking for Capital Expenditure for an insulation project, the financial department will want to see a projected ROI.

Most teams will give up at this stage.

As mentioned, their main objective is to keep the plant running smoothly and, coming up with ways to verify savings on a potential project can seem like too much hassle.

It’s very usual for me to see this when going to new sites, and it always baffles me: Crowley Carbon has carried out so many of these projects, coming up with various ways to Measure and Verify the associated savings depending on site infrastructure.

We have so much experience we know there are huge savings attainable, especially if you compare them to the money, time and effort invested to get them.

It’s basically easy pickings at this point.

Rolling Out Insulation Projects Correctly Is A Challenge

In order to be able to measure savings related to insulation projects, the actions need to be taken in a timely fashion.

There are so many variables in processes that can impact steam and hot water consumption levels, and it is preferable to implement insulation upgrades as fast as possible to be able to measure savings.

In the past a factory might concentrate on upgrading the insulation area by area, which is most definitely the way to go but unfortunately as mentioned above, it’s a task that is seen as low priority, and rightly so.

If something happens that needs maintaining and it is affecting output, insulation takes a back seat. Because of this, it often ends up being a drawn out process and sometimes the savings get lost in all the variables that impact the process.

An example of valve bag insulation.

How to Make Your Insulation Projects More Efficient and Tackle Those Issues

Since insulation projects are low on the priority list, and will most likely be in the future, one of the only ways to get them done, and get these savings rolling, is to bring in outside help, mainly in the form of outside contractors.

The project can then be completed in a timely manner, with no distractions from the task at hand.

How to Demonstrate How Much An Insulation Project Will Save

There are multiple ways to demonstrate and verify savings competently.

The direction you take will depend on what you have at your disposal. This will be different from site to site.

First and foremost the cost of steam/hot water production must be ascertained. For steam this would involve :

  • The cost of chemicals treating the water
  • The electrical cost of pumps feeding water to the boiler
  • The cost of fuel
  • Etc,

All per tonne of steam produced. In Europe, on average, depending where you are, it around €25/tonne.

The best way to carry out an M&V is when the site has multiple steam meters and hot water meters. For example, the process might be split into four different areas and each area will have a dedicated steam meter/hot water meter.

If the project is undertaken in a timely fashion and carried out area by area, the savings will be clear as day and the meters in question will identify a drop in consumption.

If you are not meter rich onsite, you can look at the fuel consumption of the boiler. In this case it is even more important that the works are carried out in a timely manner and that operating conditions in the M&V report are similar before and after.

If you have no meters that you can confidently call upon then there is always an engineering calculation.

Tthere are many out there but this is the one I prefer to use as it includes multiple variables and is highly accurate and meets the requirements of ASTM C 680 Heat loss and surface temperature calculations.

This should also be used to back up the two techniques above along with thermographic pictures on a sample of around 10% of valve bags installed, As you can see from the pics below.

Conclusion : Valve Bag Insulation Works!

Valve bag insulation, although not a very glamorous solution, it’s highly effective when managed and proven in the correct way depending on the situation.

You can see a number of before and after pictures below!

Valve Bag Insulation Before/After – Example 1

Valve Bag Insulation Before/After – Example 2

Valve Bag Insulation Before/After – Example 3

Valve Bag Insulation Before/After – Example 4

Valve Bag Insulation Before/After – Example 5

Valve Bag Insulation Before/After – Example 6

Valve Bag Insulation Before/After – Example 7

Valve Bag Insulation Before/After – Example 8

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