Huahao Sealing · Carbon Graphite Components
Huahao Sealing supplies carbon graphite seal rings, bushings and bearings for petroleum refining. Antimony-impregnated grades handle 500°C, carbonized grades reach 600°C for FCC pumps, vacuum bottom pumps and sour crude service, meeting API 682 requirements.
FCC unit oil pumps run continuously at 350-450°C; standard seal materials suffer thermal instability and oxidation failure
Sour crude and sour water are highly corrosive; metallic bearings suffer galvanic corrosion and sulfidation
Vacuum tower bottom pumps handle hot residuum laden with catalyst fines, causing abrasive wear
Frequent start-stop and thermal cycling warp seal faces and cause leakage
Antimony-impregnated graphite grade (M106H) rated 500°C with anti-oxidation treatment for FCC high-temp pumps
Carbonized graphite grade (M191T) rated 600°C with chemical inertness against sour media corrosion
Carbon graphite paired with SiC mating face provides high thermal conductivity, preventing hot spots and thermal cracking
API 682 standard seal chamber dimensions, drop-in replacement under Plan 11/23/53A flush configurations
| Temperature | -50°C ~ 600°C |
| Pressure | ≤ 25 MPa (API 682) |
| Speed | ≤ 25 m/s |
| Media | Crude oil, sour gas, catalyst fines |
| Grade | M106H (Sb) / M191T (Carbonized) |
| Mating Face | SiC / WC |
No. Carbonized graphite grades (M191T) remain chemically inert in sour crude and sour water. Sulfur ions do not attack the graphite matrix, with no swelling or pitting over long-term operation.
M106H antimony-impregnated grade rated 500°C with anti-oxidation treatment. For 550-600°C service, select M191T carbonized grade. Both pair with SiC mating faces.
Yes. Our seal ring dimensions comply with API 682 seal chamber specifications and drop into Plan 11/23/53A flush configurations without chamber modification.
Select high-hardness antimony-impregnated graphite paired with SiC face. Graphite self-lubrication reduces friction heat, SiC hardness resists particle erosion. Optional face grooving discharges particles.
