Generally, the boiler outlet water vapor pressure is less than 1.9 MPa, which is called a low-pressure boiler;
一般將2噸蒸汽鍋爐出口水蒸氣壓力為1.9兆帕以下的鍋爐，稱為低壓鍋爐;
Boiler outlet water vapor pressure of about 3.9 MPa boiler, known as medium pressure boiler;
鍋爐出口水蒸氣壓力為3.9兆帕左右的鍋爐，稱為中壓鍋爐;
Boiler outlet water vapor pressure of about 9.8 MPa boiler, known as high-pressure boiler; boiler outlet water vapor pressure of about 13.97 MPa boiler, referred to as ultra-high pressure boiler;
鍋爐出口水蒸氣壓力為9.8兆帕左右的鍋爐，稱為高壓鍋爐;鍋爐出口水蒸氣壓力為13.97兆帕左右的鍋爐，稱為超高壓鍋爐;
Boiler outlet water vapor pressure of about 17.3 MPa boiler, known as sub critical pressure boiler;
鍋爐出口水蒸氣壓力為17.3兆帕左右的鍋爐，稱為亞臨界壓力鍋爐;
Boiler outlet water vapor pressure of about 17.3 MPa boiler, known as sub critical pressure boiler;
Boiler whose outlet water vapor pressure is above 22.12 MPa is called supercritical pressure boiler.
鍋爐出口水蒸氣壓力在22.12兆帕以上的鍋爐，稱為超臨界壓力鍋爐。
