SigmaFire line of steam generators is available in sizes of 25, 35, 50, 75, 100, 125, 150 and 200 BHP (245 to 1,962 kW). It incorporates modular construction of its main components: steam generator, the feedwater tank and other feedwater equipment. The onboard steam generator can be used to heat drilling mud, a viscous liquid. The “mud” is delivered through the inner ring of a vertical, two-section pipe, to drive and lubricate a drilling head functioning beneath the sea’s surface. Units are available with servo-based burner management systems for improved pressure control, load following and repeatability.