more

less

same

could be more or less depending on other factors

DIN

BS

ASTM

IBR

create vacuum in furnace

create vacuum at turbine exhaust

pump feed water

dose chemicals in feed water

babcock and wilcox

locomotive

lancashire

cochran

former is fire tube type and latter is water tube type boiler

former is water tube type and latter is fire tube type

former contains one fire tube and latter contains two fire tubes

None of these