Post on 15-Oct-2020
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DRY ICE SCOTLAND CASE STUDY: CLEANING OF CEMENT SCALE AND DUST, DUNBAR CEMENT WORKS
LOCATION DUNBAR CEMENT WORKS
SUBSTRATE ROLL CRUSHERS, HYDRAULICS, MOTORS, GENERAL PROCESS EQUIPMENT
CONTAMINANT CEMENT DUST AND SCALE, CONGEALED HYDRAULIC OIL
PROJECT DURATION 20 HOURS (2 SEPARATE SHIFTS)
Dry Ice Scotland were asked to clean various pieces of equipment at the Dunbar Works site. The contaminant was
largely comprised of cement dust scale, which has built up over time and hardened. Additionally, some of this was
congealed with hydraulic oil around the Roll Crusher area. Photos of the work areas are included below, with
“before” shown on the left and “after” shown on the right.
For further information, please contact Ed Nimmons ed@dryicescotland.com 07855812673
Areas were blasted using regulated pres-
sures and specialist Dry Ice Scotland
equipment designed for blasting deli-
cate areas. These control measures en-
sured that no equipment was damaged
during the project.
Blasting areas were cordoned off with a
3m exclusion zone, and hazard/warning
signs made visible.
Contaminant was collected using vacu-
um and manual means and handed to
the site for disposal.
The first shift was dedicated to the hy-
draulic roll crusher area (pictured left),
cleaning a mixture of hardened cement-
powder and congealed hydraulic oil.
Care was taken to avoid any possible
damage to valves and electrical compo-
nents.
While the job was completed with the
rollers shut down, it is anticipated that
future work could be completed while in
full operation, with due safety precau-
tions.
BEFORE AFTER
The second shift consisted of general cleaning around the
site, targeted on selected areas (pictured left). In this case,
contaminant consisted of hardened cement powder.
As can be seen from the photographs, the team were able
to blast the hardened contaminant whilst mitigating any
possible damage to the coating or underlying surface. This
is due to the highly controllable nature of dry ice cleaning.
Clean-up of the contaminant was conducted at regular in-
tervals over the course of the two shifts. During blasting,
the dry ice pellets sublimate into a gas on impact. As such,
there is minimal residual waste and only the existing con-
taminant needs to be collected. This saves considerable
time during the clean-up period.
In addition, the lack of additional mess means that there is
minimal disruption to the ongoing operations on the site.
While the immediate blasting area was cordoned off, other
operations were able to carry on as normal.
Dry Ice is also non-conductive and safe to be used to clean
electrical components.
As a long term solution, Dry Ice Scotland suggest that a sin-
gle team would be dedicated to the Dunbar site either on
an “on-call” basis (subject to a specified volume of work) or
as part of a planned, regular cleaning schedule.
DRY ICE SCOTLAND CASE STUDY: CLEANING OF CEMENT SCALE AND DUST, DUNBAR CEMENT WORKS
The conclusion of this case study has
shown dry ice cleaning to be highly
effective in the blasting and cleaning
of hardened cement powder. A regular
dry ice cleaning schedule allows for
more effective inspection activities to
take place and reduces the risk of pos-
sible operational downtime due to
contamination.
For further information, please contact Ed Nimmons ed@dryicescotland.com 07855812673
BEFORE AFTER
ON-SITE CLEANING OF EQUIPMENT AND PROCESS
Specialist dry ice cleaning removes contaminants without producing any form of media waste. This non-abrasive
technique is a revolutionary method for cleaning without operational down time or damage.
Dry Ice cleans in 3 revolutionary ways:
Kinetic energy caused by speed of compressed air
Thermal effect (-78.5˚C) loosens scale/contaminate
Expansion to its gaseous state, up to 800 times its original size.
Dry Ice Scotland are UK leaders in providing dry ice cleaning. Based in the Northeast of Scotland, our in -house
manufacturing facility utilises the latest cutting edge technology in the production of dry ice using recycled CO2,
producing the densest dry ice available globally. Through our in-house workshop we are UK leaders in the develop-
ment of specialist dry ice application equipment.
TECHNICAL CHARACTERISTICS OF DRY ICE CLEANING
For general equipment cleaning purposes, we use 3mm pellets of frozen CO2
These pellets are completely non-abrasive, with a Mineral Hardness Scale between 1 (Talc) and 2 (Gypsum)
Kills bacteria—particularly important when used in cleaning of organic material
Non-conductive—safe to be used around electrical components
Recommended for light rust removal by the British Stainless Steel Association
For further information, please contact Ed Nimmons ed@dryicescotland.com 07855812673
ENVIRONMENTAL BENEFITS OF DRY ICE CLEANING
On-site cleaning—reduces transportation carbon footprint
Dry Ice manufactured from recycled CO2—minimal media carbon footprint
Non-toxic and environmentally safe—no chemicals or solvents
Zero residual waste—minimal waste generation and disposal
OPERATIONAL BENEFITS OF DRY ICE CLEANING
Cleaning can be carried out in-situ by mobile team, no transportation/removal needed
Non-abrasive, no risk of damage to delicate components
Dry and with zero residual waste—no drying time, minimal waste disposal and collection
For further information, please contact Ed Nimmons ed@dryicescotland.com 07855812673
Depth of Probe 5 secs. (Celsius) 10 secs. (Celsius) 15 secs. (Celsius) 20 secs. (Celsius)
0.5mm -0.2 -4 -7 -9
1.0mm 0 -0.5 -7 -8
1.5mm 0 -0.2 -4 -5
2.0mm 0 -0.2 -3 -4
Dry ice cleaning has minimal temperature effects on the substrate, even during unnaturally prolonged cleaning.
TABLE SHOWING TEMPERATURE EFFECTS OF DRY ICE CLEANING STAINLESS STEEL BEYOND SURFACE LEVEL
Issues Traditional Dry Ice
Equipment downtime Removal to dedicated cleaning area
Drying and clean up time In-situ cleaning No drying time
Hazardous materials/ waste
Personnel exposure to hazardous Cleaning media must be contained
No exposure to chemicals Zero residual waste
Equipment damage Grit abrasions/contamination
Movement of equipment
Zero abrasion Allows for regular preventative
maintenance
Safety Water hazards around electrical equipment Higher Pressures - HP units are 1000+ bar
Safe around electrical equipment Lower Pressures – typically less
than 20 bar
TABLE SHOWING COMPARISON BETWEEN TRADITIONAL CLEANING AND DRY ICE CLEANING
As seen in this actual demonstration, dry ice
cleaning is powerful enough to remove
contaminants, yet gentle enough to avoid
damaging even the most gentle surface.