Tissue360 - Spring/Summer 2017 - 30

Regional Yankee Dryer Deliveries - 1971 to 2015
By Shell Face Length in Millimeters (inches)
Europe

3345 (131.7)

Asia

3235 (127.4)

North America

4680 (184.3)

Latin America

3200 (126)

Africa & Mid-East

3225 (127)

0

1000

2000

3000

4000

5000

Fig. 9
Global Yankee Deliveries - 1971 to 2015
By Shell Material of Construction
1,600

1,368

1,400
1,200
1,000
800
600
400

196

200
0

World Totals
Cast Iron

Steel

Fig. 10

SUMMARY - KEY CONCLUSIONS
* There are currently an estimated 1,560 yankee dryers in operation
around the world.
* Tissue capacity growth rates have slowed in the Europe and North
America regions.
* Tissue capacity growth rates have increased in Latin America and in
Africa/Mid-East regions.
* Tissue capacity growth rates have greatly increased in Asia, especially
in China.
* Current yankee dryer deliveries are primarily manufactured from
welded steel. However, gray cast iron yankee dryers may still be
available from one or two manufacturers.
* The percentage of yankee dryers that were delivered with welded
steel shells in the most recent five-year period from 2011-2015 was
55.5 percent.
* Current operating yankee dryers globally are primarily gray cast iron
(87.5 percent).
* Current operating Yankee Dryers in North America are primarily
gray cast iron (98.3 percent).

Global Yankee Deliveries
By 5-year time periods
By Shell Material of Construction
180
160
140
120
100
80
60
40
20
0

162
130
103

88

27

7
2001-2005

2006-2010
Cast Iron

2011-2015
Steel

Fig. 11
Regional Yankee Deliveries - 1971 to 2015
By Shell Material of Construction
600

540

500

400

336
283

300

200

140

115
100

69

37

26

5

13

0

Europe

Asia

North America
Cast Iron

Latin America

Steel

Fig. 12
30

Tissue360ยบ SPRING/ SUMMER 2017

Even though the most recent trend in new yankee dryer deliveries is
toward welded steel shell material, there still exists a very large global
population of yankee dryers with gray cast iron shells. World yankee
dryers since 1970 that were delivered with gray cast iron shells was 87.5
percent (1,368 of 1,564), and yankee dryers delivered with welded steel
shells was 12.5 percent (196 of 1,564).
Metallized spray coatings on the shell papermaking surface have
extended the time between grinds and have allowed great increases
in the useful lifetime of the currently installed yankee dryers. Many
operators believe that the useful life of yankee dryers with metallized
coating is several decades.
Metallization of yankee dryers first began in the 1980s. This started
as an effort to extend the operating life of yankee dryers constructed
with gray cast iron shells.
All welded steel yankee dryers come supplied with a metallized
coating so as to minimize any galling and/or adhesive wear between
the doctor blades and the yankee dryer welded steel shell.
What this means is that yankee dryers with both types of shell material will continue to be operated for a long period of time and that
tissue manufacturers (owners and operators) need to know the design,
operational limits, and inspection methods needed for yankee dryers
constructed from both types of shell material.
Cast Iron and Steel Yankee Dryers Deliveries by Regions: Figure 12
looks at the regional deliveries of yankee dryers manufactured from
both types of shell material. In North America there are currently 283
cast iron yankee dryers (98.3 percent, or 283 of 288) and five welded
steel yankee dryers (1.7 percent, or five of 288).

Africa & Mid-East

Brian Tholke has been a TAPPI member and active on the Yankee
Committee for more than 30 years. He has published and presented several papers at the old TAPPI Engineering Conference and helped to lead
a joint TAPPI/National Board task group to add sections on the yankee
dryer to the National Code of Boilers & Pressure Vessel Inspectors in the
mid-2000s. Yankee Dryer Installation, Operation, Inspection, and Repairs
is now in our National Code. His background is in engineering and NDE.
He provided expertise on QA/QC for 20 yankee dryer purchases. Tholke
now resides in Ventura, CA.
www.tappi.org


http://www.tappi.org

Table of Contents for the Digital Edition of Tissue360 - Spring/Summer 2017

Setpoint
Tissue Industry News
ST Tissue Launches PM 5 Conversion to Tissue at Virginia Mill
Global Survey Shows Trends in Yankee Dryer Deliveries
How Will the Tissue Connection Between Europe and North America Continue?
St. Croix Tissue: The Strong Newcomer in the US Tissue Business
Sustainability is Central for Sofidel
RISI and TAPPI to Co-Produce Key Tissue Event in 2017
Tissue360 - Spring/Summer 2017 - intro
Tissue360 - Spring/Summer 2017 - cover1
Tissue360 - Spring/Summer 2017 - cover2
Tissue360 - Spring/Summer 2017 - 3
Tissue360 - Spring/Summer 2017 - 4
Tissue360 - Spring/Summer 2017 - 5
Tissue360 - Spring/Summer 2017 - Setpoint
Tissue360 - Spring/Summer 2017 - 7
Tissue360 - Spring/Summer 2017 - 8
Tissue360 - Spring/Summer 2017 - Tissue Industry News
Tissue360 - Spring/Summer 2017 - 10
Tissue360 - Spring/Summer 2017 - 11
Tissue360 - Spring/Summer 2017 - 12
Tissue360 - Spring/Summer 2017 - 13
Tissue360 - Spring/Summer 2017 - 14
Tissue360 - Spring/Summer 2017 - ST Tissue Launches PM 5 Conversion to Tissue at Virginia Mill
Tissue360 - Spring/Summer 2017 - 16
Tissue360 - Spring/Summer 2017 - 17
Tissue360 - Spring/Summer 2017 - 18
Tissue360 - Spring/Summer 2017 - 19
Tissue360 - Spring/Summer 2017 - 20
Tissue360 - Spring/Summer 2017 - 21
Tissue360 - Spring/Summer 2017 - 22
Tissue360 - Spring/Summer 2017 - 23
Tissue360 - Spring/Summer 2017 - 24
Tissue360 - Spring/Summer 2017 - Global Survey Shows Trends in Yankee Dryer Deliveries
Tissue360 - Spring/Summer 2017 - 26
Tissue360 - Spring/Summer 2017 - 27
Tissue360 - Spring/Summer 2017 - 28
Tissue360 - Spring/Summer 2017 - 29
Tissue360 - Spring/Summer 2017 - 30
Tissue360 - Spring/Summer 2017 - 31
Tissue360 - Spring/Summer 2017 - 32
Tissue360 - Spring/Summer 2017 - How Will the Tissue Connection Between Europe and North America Continue?
Tissue360 - Spring/Summer 2017 - 34
Tissue360 - Spring/Summer 2017 - 35
Tissue360 - Spring/Summer 2017 - 36
Tissue360 - Spring/Summer 2017 - St. Croix Tissue: The Strong Newcomer in the US Tissue Business
Tissue360 - Spring/Summer 2017 - 38
Tissue360 - Spring/Summer 2017 - 39
Tissue360 - Spring/Summer 2017 - 40
Tissue360 - Spring/Summer 2017 - 41
Tissue360 - Spring/Summer 2017 - 42
Tissue360 - Spring/Summer 2017 - Sustainability is Central for Sofidel
Tissue360 - Spring/Summer 2017 - 44
Tissue360 - Spring/Summer 2017 - 45
Tissue360 - Spring/Summer 2017 - RISI and TAPPI to Co-Produce Key Tissue Event in 2017
Tissue360 - Spring/Summer 2017 - cover3
Tissue360 - Spring/Summer 2017 - cover4
http://www.nxtbook.com/naylor/PPIB/PPIB0118
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http://www.nxtbook.com/naylor/PPIB/PPIB0117
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