The VFTU series are 'fire tube burner-generated' hot gas heated water bath vaporizers. Hot gas is generated by a burner system and circulated through heat exchangers heating water retained in a ballast tank to the required temperature; cryogen is vaporized through tube bundles by direct contact with hot water.
VFTU series generated hot gas heated water bath vaporizers are generally used for the higher capacity requirements. They range from 250,000 SCFH to in excess of 3,000,000 SCFH (6,600 to 80,000 Nm3/hr). They are most commonly used in pipeline back-up service or other high volume systems such as steel mills, or LNG peak-shaving and LNG send-out station duty.
Tube bundles are available in standard incremental sizes, as are the tanks. Bundles and tanks can be used in a variety of combinations to achieve most customer requirements of steady state capacity and ballast time. Several different process and pressure building bundles can be installed in a single tank. These systems are essentially self contained requiring only on site connection of services and gases prior to being operational.
These direct fired vaporizers are more expensive for a given capacity than a direct steam vaporizer, but hot water bath vaporizers offer several advantages.