This HP-LT Preheater is engineered for the 28 MW Mahanagdong Geothermal Power Plant Project (GEX 2810-28) of Energy Development Corporation, and manufactured in full compliance with ASME Boiler & Pressure Vessel Code Section VIII, Division 1 and TEMA Class "C" standards. Designed as a critical component in Organic Rankine Cycle (ORC) geothermal power generation, the unit transfers heat from corrosive geothermal brine to organic working fluid (n-Butane) under high-pressure, moderate-temperature conditions.
With ASME U-Stamp certification, 100% radiographic examination on all pressure boundary welds, and a duplex stainless steel tube bundle (UNS S31803/2205), this preheater delivers long-term reliability in aggressive geothermal service.
| Item | Specification |
|---|---|
| Equipment Name | HP-LT Preheater |
| Tag No. | PH1001A/B |
| Project | GEX 2810-28 MW Mahanagdong Geothermal Power Plant |
| Client | Energy Development Corporation |
| Drawing No. | P063-E-ORC-M-DWG-1021 (Rev. 1) |
| TEMA Type | NEN |
| Design Code | ASME VIII Div.1 + TEMA "C" |
| ASME U-Stamp | Yes |
| Number Required | 1 |
| Component | Material |
|---|---|
| Shell & Cover | SA-516 Gr.70 |
| Channel | SA-516 Gr.70 + SS 316L cladding (3 mm min) |
| Tube Bundle | UNS S31803 / 2205 (Duplex SS) |
| Tubesheet | SA-266 Gr.2N + SS 316L weld overlay (0.10 mm min) |
| Bolting | SA-193 B8/B8M / SA-194 Gr.8M |
| Gaskets | Kammprofile 316L / Graphite |
| Baffles & Supports | Carbon Steel (C.S.) |
| Parameter | Value |
|---|---|
| Number of Tubes | 2759 |
| Tube Length | 16000 mm |
| Tube Outer Diameter | 19.05 mm |
| Tube Wall Thickness | 0.889 mm (BWG) |
| Tube Pitch | 25.4 mm |
| Tube Pattern | 30° triangular |
| Passes (Shell / Tube) | 1 / 1 |
| Parameter | Shell Side | Tube Side |
|---|---|---|
| Fluid | n-Butane | Brine |
| Design Pressure | 42 Bar | 32 Bar |
| Design Temperature | 200 °C | 220 °C |
| Operating Temperature | 85 °C | 95 °C |
| Metal Temperature (Tubesheet) | 165 °C | 15 °C |
| Corrosion Allowance | 1.587 mm | 1.587 mm |
| Nozzle Tag | Size | Rating / Type | Service |
|---|---|---|---|
| N1A | 24" | N/A BW | Inlet Shell |
| N1A | 24" | N/A | Outlet Shell |
| N3A | 16" | 300# WN | Inlet Tube |
| N5A | 16" | N/A WN | Outlet Tube |
| N7A | 2" | N/A BW | Drain Shell |
| N7A | 2" | N/A BW | Vent Shell |
| N8DA/B | 2" | 300# WN | Drain Tube |
| N8A | 2" | 300# WN | Vent Tube |
| N51 | 1/2" | N/A NPT F | Temp. Instrument Shell |
| N61 | 1/2" | N/A NPT F | Temp. Instrument Tube |
| Condition | Weight (kg) |
|---|---|
| Empty Weight | 55,800 |
| Operating Weight | 85,800 |
| Full of Water | 90,000 |
| Bundle Weight | 21,500 |
| Test | Standard / Method |
|---|---|
| Hydrostatic Test | Per ASME VIII-1 (Vendor) |
| Radiographic Examination (RT) | 100% on pressure boundary welds |
| Ultrasonic Test (UT) | Per code & contractual documents |
| Magnetic Particle Test (MT) | Per code & contractual documents |
| Penetrant Test (PT) | Per code & contractual documents |
| PWHT | Per code (Shell & Tube sides) |
| Item | Shell Side | Tube Side |
|---|---|---|
| Painting | Per Specification | Per Specification |
| Electrical Tracing | N/A | N/A |
| Internal Coating | -- | -- |
| Fireproofing | -- | -- |
| Impregnation Device | -- | -- |
| Bypass Seal | 2 pairs sealing strips | 2 pairs sealing strips |
| Expansion Joint | N = 5000 cycles | N = 5000 cycles |
