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Material
1. metal strap
A. made of 08F,0Cr13, 0Cr18Ni19Ti, 0Cr18Ni9Ti, 00Cr18Ni10, 0Cr18Ni12Mo2Ti, 00Cr17Ni14Mo2 cold-rolled steel strap with a thickness of 0.15mm~0.25mm or decided by the supplier and acquirer.
B. the metal strap should be pre-molding V-shaped or W-shaped narrow strap with smooth and clean surface, without any defects, such as roughness, cracks, scratches, drop pits or rusty spot, etc.
C. Hardness value of the stainless steel HV≤200
2. Non-metal strap
A. the non-metal packing material is specially-made asbestos strap, flexible graphite strap, PTFE strap, non-asbestos fiber strap and isinglass strap with a thickness of 0.3-1.0mm.
B. loss of weight on ignition of specially-made asbestos should be ≤25%.
C. chlorine ion content of non-metal strap should be ≤100PPM.
D. the recommended temperature and pressure of various medium and different metal straps.
media material | asbestos | graphite | non-asbestos | PTFE |
Water-type media | 600°C,CL 2500 | 550°C,CL 1500 | 350°C,CL 1500 | -200-260°C, |
oil-type media | 500°C,CL 1500 | 550°C,CL 600 | 350°C,CL 600 | -200-260°C, |
gas-type media | 400°C,CL 600 | 550°C,CL 400 | 350°C,CL 400 | 200-260°C, |
Note: used with non-oxygenization media, graphite can reach 800°C.
Table 1-5-3
materials | temperature °C | maximum work pressure | applied media | compression ratio | resilience ratio % | Stress relaxation force % |
Expansion graphite | -220--550 | 250 BAR | corrosion media | 18--30 | ≥17 | ≤18 |
specially-made asbestos strap | -200---600 |
|
| 18--30 | ≥19 | ≤28 |
PTFE | -200-- 250 | 100 BAR | corrosion media | 18--30 | ≥15 | ≤13 |
Non-asbestos materials | -100--250 | 100 BAR | general air sealing | 18--30 | ≥19 | ≤28 |
isinglass | -150--800 | 100 BAR | special high temperature | 18--30 |
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3) Strengthening ring. Unless specially agreed, the internal strengthening material should be the same with that of metal strap, and the materials of external strengthening ring should be A3 steel and have received anticorrosive treatment.
5) preloaded pressure: Y=70.0±1Mpa
6) Gasket Coefficient: M=2.5~4.0
G-300 Spiral Wound Gasket
