Dual Fuel
EX Series Models
Miura is known world-wide for our commitment to protecting the environment and our innovative and efficient boiler designs. Our EX Gas/Oil Series High Pressure Steam Boiler is the most versatile industrial steam boiler in the world. The EX design minimizes carryover and produces dry 99+% saturated steam in less than 5 minutes from a cold start. Faster start-up means less fuel used, greater savings, and more responsible use of precious natural resources.
  • Dual fuel fired: Natural Gas, Propane or #2 Fuel Oil
  • High pressure options available (300 MAWP, 250 MAWP or 170 MAWP)
  • Hot water boilers are available depending on models (refer to the catalog for the hot water boilers for details)
  • NOx rating is available as low as 30ppm depending on model
EX Series Model Design
The MIURA EX Series design consists of rows of vertical tubes sandwiched between two rectangular headers. Both headers are encased in a castable refractory with only the tubes exposed to flame and/or combustion gases. The upper header is attached to the lower header only by the tubes. As the tubes expand and contract, the headers float up and down accordingly.
This ’floating header’ concept greatly reduces stress and allows for the use of cold feedwater without the fear of significant thermal shock. The ’leaky tube’ problems associated with firetube and bent watertube designs have been eliminated.
Ultra Compact Design Saves Space and Costs
Miura's EX Series boilers occupy 33% less floor space than typical firetubes, and do not require tube pull space. Compact design means much smaller radiation losses and larger fuel savings.
Full Steam Output In Less Than 5 Minutes
Floating headers mean fast start-up. MIURA boilers produce fast steam in less than 5 minutes from a cold start-up. Standard firetubes require 1 to 1.5 hour start-up times. Miura’s unique design yields significant time and fuel savings.
Dry Steam
The MIURA EX design minimizes carryover and produces dry 99+% saturated steam through a 3-stage process:
  • Initial separation in the tubes
  • Second separation in the upper header and baffle plate
  • Final separation in the cyclone separator
Early Warning Scale Monitor
Scale is a problem all boilers have to deal with. Scale forms when boiler feedwater is not properly treated. Advanced scale formation acts as an insulator; only an eggshell thickness of scale results in a 10% efficiency loss, higher fuel bills and possible damage to the boiler system.
As standard equipment, all Miura EX models are equipped with a thermocouple attached directly to a tube. Should scale begin to form, the Miura boiler will alert the operator - allowing the operator to trace and repair the source of the water hardness. The scale can be removed to restore the boiler to its original efficiencies - saving tens of thousands of dollars in wasted fuel and repair bills.
Unbeatable In-Service Efficiencies
Miura’s computer-aided design results in optimal heating surface transfer with minimal water content for fuel-to-steam efficiencies of 85%. Typical firetube designs can deliver up to 83% fuel-to-steam efficiencies. However, in actual use, MIURA averages 10 to 40% fuel savings over standard firetube designs. How does a 2% difference in fuel-to-steam efficiencies translate into a 10 to 40% ACTUAL FUEL SAVINGS? Contact your local Miura representative for details.
EX-100 SGO
EX Gas/Oil Series – High Pressure Steam Boiler
100HP
EX-150 SGO
EX Gas/Oil Series – High Pressure Steam Boiler
150HP
EX-200 SGO
EX Gas/Oil Series – High Pressure Steam Boiler
200HP
EX-250 SGO
EX Gas/Oil Series – High Pressure Steam Boiler
250HP
EX-300 SGO
EX Gas/Oil Series – High Pressure Steam Boiler
300HP
EX Series Comparison Chart
EX-100 EX-150 EX-200 EX-250 EXN-300 [6][7] EX-300
Utilization Horsepower 100 HP 150 HP 200 HP 250 HP 300 HP 300 BHP
Maximum Pressure [1] 170 PSIG MAWP, 150 PSIG Maximum Operating
Equivalent Output [2] 3,450 LB/HR 5,175 LB/HR 6,900 LB/HR 8,625 LB/HR 10,350 LB/HR 10,350 LB/HR
Heat Output 3,348,000 BTU/HR 5,022,000 BTU/HR 6,695,000 BTU/HR 8,369,000 BTU/HR 10,050,000 BTU/HR 10,040,000 BTU/HR
Efficiency (fuel to steam) [3] 85% (80% without Economizer) 86% (81% without Economizer))
Heating Surface Area 196 FT² 323 FT² 323 FT² 389 FT² 499 FT² 515 FT²
Operational Weight 7,250 LBS 11,500 LBS 11,500 LBS 17,850 LBS 18,000 LBS 18,000 LBS
Shipping Weight 7,500 LBS 7,700 LBS 8,340 LBS 8,990 LBS 11,010 LBS 11,010 LBS
Width 81 in. 91 in. 91 in. 94 in. 99 in. 99 in.
Length 109 in. 130 in. 130 in. 136 in. 142 in. 142 in.
Height 99 in. 120 in. 120 in. 146 in. 157 in. 166 in.
Combustion System Proprietary Forced Draft, Step Fired Modulation Hi-Low-Off
Ignition System Electric Spark Ignited, Interrupted Gas Pilot
Power Supply 208, 230, 460, 575V, 3 phase, 60Hz
Max. Electrical Consumption 13.35 KVA (14.2 for Oil) 24.5 KVA (25.4 for Oil) 27.5 KVA (28.5 for Oil) 32.3 KVA (34.3 for Oil) 35.4 KVA (37.3 for Oil) 35.4 KVA (37.3 for Oil)
Fuel Type [4] Natural Gas or Propane (3-5 PSIG), No. 2 Oil
Gas Consumption [5] 3,920 SCFH 5,880 SCFH 7,850 SCFH 9,810 SCFH 11,780 SCFH 11,670 SCFH
No. 2 Oil 28.1 GAL/HR 42.2 GAL/HR 56.3 GAL/HR 68.7 GAL/HR 84.5 GAL/HR 82.3 GAL/HR
Gas Supply Pressure 3-5 PSIG (Natural Gas or Propane)
Main Steam Outlet Valve 2 in. 3 in. 3 in. 4 in. 4 in. 4 in.
Safety Valve Outlet [8] One 2 in. One 2 1/2 in. One 2 1/2 in. One 2 1/2 in. Two 2 1/2 in. Two 2 1/2 in.
Main Water Inlet 1 in. 1 in. 1 in. 1 1/4 in. 1 1/4 in. 1 1/2 in.
Fuel Gas Inlet 2 in. 2 in. 2 in. 2 1/2 in. 2 1/2 in. 2 1/2 in.
Fuel Oil Inlet 3/4 in. 3/4 in. 3/4 in. 3/4 in. 3/4 in. 3/4 in.
Automatic Surface Blowdown One 3/8 in. One 3/8 in. One 3/8 in. Two 3/8 in. Two 3/8 in. Two 3/8 in.
Manual Blowdown Two 1 in. Two 1 in. Two 1 in. Two 1 in. One 1 in. & One 1 1/4 in. One 1 in. & One 1 1/4 in.
Chimney Diameter (ID) 14 in. 20 in. 20 in. 20 in. 26 in. 20 in.
Flame Detector Ultraviolet Flame Eye Sensor
Pressure Control Adjustable Pressure Transducer and Switch
Liquid Volume Control Electric Conductivity Type
Overheat Protection Low Water Cut Off & Thermocouple
Notes
  1. Optional EXH-SGO Series at 250 Psig MAWP, 225 Psig maximum operating
  2. Equivalent output calculated from and at 212°F (100°C) feed water at 212°F (100°C) steam.
  3. Thermal efficiencies are based on high heating values of fuels at 68°F (20°C) feed water.
  4. UL and c-UL approved for natural gas or propane.
  5. Gas consumption based on natural gas with high heating 1004 BTU/SCF.
  6. Low water content option available to meet provincial water volume regulations in Canada
  7. Low NOx model (EXN300SGOF) available to meet 30ppm NOx
  8. Safety valve outlet size may change depending on the pressure setting.

All Miura steam boilers are fully packaged and test fired at factory. Built to meet or exceed UL and ASME standards in U.S.A.; c-UL and B-51 standards in Canada.