1. Steam was supplied by 6 pulverized coal burning water tube boilers . 2. Ivanpah Solar uses two Rentech Type-D water tube boilers . 3. Steam was provided by four Babcock and Wilson oil fired water tube boilers . 4. Babcock & Wilcox was founded in 1867 and gained early fame with its water tube boilers . 5. The power plant consisted of twin triple-expansion steam engines and two Yarrow water tube boilers . 6. Santa Clara had six water tube boilers with a combined heating surface of and a working pressure of 300 NHP 7. Also, the old cylindrical boilers with fire tubes were displaced by water tube boilers , which are inherently safer. 8. The initial plant installed at the power station consisted of two Babock & Wilcox cross type marine water tube boilers . 9. The ship was also re-boilered with two water tube boilers that had a heating surface of and operated at. 10. The turbines were powered by 24 double-ended narrow water tube boilers that produced up to 21 atmospheres of pressure.