Page 12: of Maritime Reporter Magazine (August 1973)

Why build ING containment tanks

Economy

First, material cost. Armco CRYONIC 5 Steel costs less than other cryogenic materials —20% less than 9% nickel steel. Second, operational savings. Armco CRYONIC 5 expands and con- tracts less than other plate materials —one-half as much as 5083-0 Aluminum. Less expansion/ contraction means sounder insulation integrity.

And a thinner wall, due to CRYONIC 5's higher strength, can result in increased capacity. Cal- culations, based on one containment system showed an additional annual $1 million of de- liverable liquefied gas in a 125,000 m3 tanker.

Toughness

Armco CRYONIC 5 Steel meets these minimum

Charpy V-Notch values at -275 F, 25 ft-lbs (longitudinal), 20 ft-lbs (transverse), and 15 mils lateral expansion (transverse). They are a clear indication of CRYONIC 5's ability to provide a reliable containment system. After welding,

Armco CRYONIC 5 provides sufficient tough- ness in the heat-affected zones to meet ap- plicable regulatory requirements. Extensively tested, Armco CRYONIC 5 Steel provides the designer and owner a fail-safe material meas- ured by fracture mechanics, crack propagation and conventional fatigue studies.

Wettability

Armco CRYONIC 5 Steel can be joined to other nickel-alloy steels, carbon steels and the aus- tenitic stainless steels by all commonly used welding processes—manual, submerged-arc and gas metal-arc welding. Familiar, firmly established welding procedures, performed with existing equipment, can help achieve high qual- ity welding, save fabrication time and eliminate the need for new equipment.

In addition, we provide CRYONIC 5 with an extremely low sulfur and phosphorus level. This combines with the low carbon level to give

CRYONIC 5 excellent resistance to underbead cracking. 14 Maritime Reporter/Engineering News