상세설명
| INFORMATION ABOUT NON-METALLIC EXPANSION JOINT |
| 1) Definition of Product |
| The non-metallic expansion joint are
flexible connectors designed to eliminate the thermal stress created by
absorption of displacement from thermal changes in ducting systems. It also
absorbs vibrations and compensates for minor installation errors in its ducting
or equipment. They are fabricated from a wide variety of non-metallic materials,
including synthetic elastomers, fabrics, insulation materials and
fluoroplastics, depending on the designs. |
| 2) Major Applications |
| The range of use for non-metallic expansion
joints has widened since its introduction in the early sixties. The stricter
environmental regulations have resulted in the development of more sophisticated
duct systems, requiring non-metallic expansion joints to solve those problems
caused by the thermal and mechanical stresses generated in these complex
systems. Although the major user of the non-metallic joint continues to the power generation industry, the use of this product has expanded into virtually energy industry, which conveys gases. A partial list of those industries is as follows: |
| ① Power generation - Fossil Fired Plants - Gas Turbine Plants - Cogeneration Plants - Nuclear Power Plants ② Pulp and Paper Plants ③ Refineries - Petroleum industry. - Chemical equipment |
④ Steel Mills ⑤ Smelters ⑥ Cement Plant ⑦ Refuse Incineration ⑧ Marine ⑨ Food Processing ⑩ HVAC-Heating Ventilating and Air Conditioning |
| APPLICATION FOR NON-METALLIC EXPANSION JOINT |
| 1.
Applications Economizer to Air Heater Gas Recirculation to Boiler Air Heater to Precipitator Recovery Boiler to Precipitator Turbo-Expander to CO Boiler CO Boiler to Precipitator. |
  Temperature : 700℉~900℉ for
continuous operation, excursion to 1200℉ Media : Low pH Flue gas from the combustion of
coal, oil or caustic black liquor.; Flue gas from regeneration process. Particulate : Transferred with
heavy fly ash from coal combustion, salt cake from black liquid fuel or catalyst
carryover from the FCCU unit at a Refinery. Insulation / Lagging : Do not lag over the
expansion joint. Also, remove lagging back away from the flanges to allow
radiant cooling. Pressure
: Slightly negative for balance draft boilers, otherwise positive pressure as
much as 40-50 inches water gage. Low pressure off the Turbo-Expander. Operating Conditions : Systems
usually on line for 12 to 18 months. Refineries have longer durations between
major outages. Only Power ‘peaking; plants will cycle more frequently. Movements : Ductwork/boilers
generally have large expansions and require joint system with large lateral and
compression capabilities. |
| 2.
Applications Air Heater to Fossil Fried Boiler, Air Heater to Coal Mills |
| Temperature : 600℉ ~750℉ for
continuous operation.
Media : Clean ambient air pushed from the FD Fan and from the Primary Air
Fan thru the Air-heater to the Boiler both directly and thru the mills Particulate : Clean Air Insulation / Lagging : Do not lag
over the expansion joint. Also, remove lagging back away from the flanges to
allow radiant cooling
Pressure : Positive 5” water to as high 80” of water for positive
pressure boilers.
Operation : After start up movement is normal. Severe high pressure
operating conditions may be experienced in the Primary Air Ducts of Positive
Pressure Boilers.
Movements : Moderate high temperatures will generate moderate compressive
and movements when the unit is on line. Each change in direction in the ductwork
will generate a resultant lateral offset. |
| 3.
Applications Primary Air Fan to Air Heater, FD Fan Air to Air Heater, Primary Air to Recovery Boiler, Ambient Air to Turbine, FD Fan Air to Recovery Boiler |
| Temperature : Ambient air,
-20℉~120℉ Media : Ambient
air Particulate :
None Heat Insulation and
Insulation : Heat insulation and insulation can be used on the outside of
the product in the case of low operating temperatures. Pressure : Positive pressure, 40~50 inches water
gauge of higher. Turbine air inlets are slight negative pressure. Outlet at fans
may produce pressure pulsations and/or extreme turbulence. Operation : Operational conditions
have little effect on the airside ducts. Cyclical conditions and dew point have
little effect as well
Movements : Joints at boilers subject to large movements. Fan outlet
joint see little movement, primarily vibration. |
| 4.
Applications Re-Heater to Chimney, Precipitator to Induced Draft Fan, Induced Draft Fan to Chimney, Induced Draft Fan to Scrubber, Steam Generator to Stack, Precipitator to Chimney |
| Temperature : Continuous operation
temperature, 350℉~500℉
Media : Flue gas from precipitator drawn by Induced Draft Fan; Scrubbed
Flue gas from Re-Heater going to Chimney Turbine Exhaust Gas from Heat Recovery Steam Generator to Chimney. Particulate : Minimal before scrubber systems,
negligible after scrubber systems. Insulation / Lagging : Temperatures allow lagging
over the expansion joints without adverse effects. Pressure : -15”wg after precipitators and +15”wg
after I.D fan. The ducts of scrubbers and steam generator ends are affected by
the pressure -5~+5”wg.
Operation : Although movements are not severe temperatures will approach
dew point present potential corrosion problems. Movements : Moderate compressive and lateral
movements expected depending on ductwork configuration and length. Fan Joint
usually see minimal movements. |
| 5.
Applications Scrubber to Re-Heater, Scrubber Bypass to Scrubber, Scrubber Bypass to Re-Heater, Scrubber Outlet to Re-Heater |
| Temperature : Continuous operation
temperature 150℉ ~350℉
Media : Dry flue gas to scrubber or bypass pushed by induced Draft Fan ;
Wet flue gas at scrubber inlet: Wet, scrubbed flue gas from Scrubber (flue gas
desulfurization) going to Reheater. Particulate : Minimal before scrubber systems,
negligible after scrubber systems. Insulation / Lagging : Temperatures allow lagging
over the expansion joint without adverse effects. Pressure : Positive after the induced Draft Fan,
as much as 15" wg. Slightly negative, -5”wg. To slightly positive, +5”wg after
Scrubber depending on unit load and weather conditions. Operation : Although movements are not severe
temperatures will approach dew point and present potential corrosion problems.
Wet Scrubber Service is potentially highly corrosive. Movements : Small movements
expected. |
| 6.
Applications Diverter Bypass to Stack, Diverter Exhaust to HRSG, Turbine Exhaust to Diverter Inlet, Turbine Outlet Stack |
| Temperature : Continuous operation
temperature, 1000℉~1200℉, excursion to 1350℉. Media : Turbine Exhaust Gas from combustion of
natural gas or fuel oil. Dry and non-corrosive. Particulate : None. Insulation / Lagging : Do not lag over the
expansion joint. Also remove lagging back away from the flanges to allow radiant
cooling. Pressure :
Constant positive pressure generally no higher than 15 to 20 inches water
guage. Operation : Systems
with heat recovery are usually on line for 12 to 18 months. Power ‘peaking’
plants may cycle frequently as much as once per day Movements : Ductwork/ equipment expansions are
large due to the temperature. Generally, lateral movements are small due to
short, direct ductwork runs. |
| CONNECTION METHOD OF THE PRODUCT TO DUCT |
