ASME SA350 LF2 CL1 Heat Exchanger Parts Top Body Flange Bottom Flange
ASME SA350 LF2 CL1 Heat Exchanger Parts Top Body Flange Bottom Flange
ASTM A350 is a standard specification for carbon steel and low-alloy steel forgings used for notch toughness testing of pipeline components. This specification covers various products such as forged or ring rolled flanges, forged fittings, and valves made of carbon steel and low-alloy steel, and is particularly suitable for low-temperature environments such as LNG facilities, cold storage, and polar engineering. And a notch toughness test is required. These products are manufactured according to specified dimensions or comply with the size standards specified in the standards.
Location:
- Mounted at the upper section of a vessel, tank, or equipment.
Functions:
- Provides access for inspection, maintenance, or cleaning (e.g., manhole covers).
- Connects to inlet pipes, vents, or instrumentation (e.g., pressure gauges).
- Seals the top opening while allowing future disassembly.
Common Types:
- Blind Flange (seals openings temporarily).
- Weld Neck/Slip-On Flange (for high-pressure/temperature connections).
- Installed at the lower section of equipment (e.g., tanks, reactors, columns).
Functions:
- Facilitates drainage, sludge removal, or outlet piping.
- Supports connections to discharge valves, pumps, or piping networks.
- Often designed to handle sediment/abrasive materials (may include reinforced seals).
Common Types:
- Slip-On/Threaded Flange (for easy assembly).
- Orifice Flange (for flow measurement).
Difference:
| Feature | Top Body Flange | Bottom Flange |
| Purpose | Access, venting, instrumentation | Drainage, outlet connections |
| Pressure | Typically lower (unless pressurized) | Higher (due to fluid head/gravity) |
| Material | Standard (e.g., carbon steel, SS) | May be corrosion-resistant (e.g., SS 316) |
| Sealing | Gaskets for easy opening | Robust seals (anti-leak design) |
| Item | Chemical Req. % | ||
| Gr. LF1 | Gr. LF2 | Gr. LF3 | |
| C | ≤ 0.30 | ≤ 0.30 | ≤ 0.20 |
| Mn | 0.60~1.35 | 0.60~1.35 | ≤ 0.09 |
| P | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 |
| S | ≤ 0.04 | ≤ 0.04 | ≤ 0.04 |
| Si | 0.15~0.30 | 0.15~0.30 | 0.20~0.35 |
Mechanical Properties
| Tensile Requirements |
LF1 and LF5 CL.1 | LF2 CL.1 and 2 | LF3 CL.1 and 2,LF5 CL.2 |
|---|---|---|---|
| T.S min. ksi [Mpa] |
60~85 [415~585] |
70~95 [485~655] |
70~95 [485~655] |
| Y.S min. ksi [Mpa] |
30 [205] |
36 [250] |
37.5 [260] |
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