Steam transmission with high temperature and high pressure resistance
1、 EPDM rubber braided steam pipe: the core definition for high-temperature steam transportation
EPDM rubber braided steam pipe is specially designed for the transmission of high-temperature saturated steam (≤ 1.6 MPa, ≤ 200 ℃) and superheated steam (≤ 250 ℃). Its core performance includes:
Temperature resistance
Continuous working temperature of -40 ℃~+160 ℃ (short-term temperature resistance peak of 200 ℃), tensile strength retention rate ≥ 85% after thermal aging (150 ℃× 72h) (ASTM D573 test);
Chemical resistance
Resistant to condensation water with pH 3-11, weak acid and weak base media, ozone aging (50 pphm × 70h) without cracks (ISO 1431-1);
Flexibility
Bending radius ≤ 4 times the pipe diameter (taking DN50 as an example, bending radius ≤ 200mm), suitable for complex pipeline layouts.
According to the ISO 6134 standard, steam pipes must pass a static pressure test at 1.5 times the working pressure (2.4 MPa) and have no leakage or expansion deformation within 30 minutes.
2、 Multi layer reinforced structure: engineering balance of pressure resistance and temperature resistance
The EPDM steam pipe adopts a four layer composite structure design:
Internal adhesive layer
High purity EPDM rubber (ethylene content ≥ 55%), thickness ≥ 3.0mm, surface smoothness Ra ≤ 1.6 μ m, reducing steam condensation water retention;
Enhancement layer
Double layer high-strength polyester fiber weaving (linear density ≥ 2200 dtex) or copper plated steel wire winding (tensile strength ≥ 2200 MPa), weaving angle 45 °± 2 °, burst pressure ≥ 6.0 MPa;
Thermal conductive layer
(Optional): Graphene modified EPDM (thermal conductivity ≥ 0.35 W/m · K) to reduce heat loss;
Outer adhesive layer
Weather resistant EPDM+CR (chloroprene rubber) blend adhesive (ratio 7:3), thickness ≥ 2.5mm, UV resistant (QUV 1000 hours without cracking).
Taking DN80 pipe as an example, its weight is ≤ 2.8 kg/m and the applicable steam flow rate is ≤ 1.2 t/h.
3、 Rigorous working condition verification: reliability testing from laboratory to industrial site
EPDM steam pipes need to undergo three key tests to verify their performance:
High temperature pulse test
： 1.6 MPa saturated steam (160 ℃) cycled 500000 times at a frequency of 1Hz, with interlayer bonding strength ≥ 5 kN/m (ISO 8033);
Pressure creep test
： Under a pressure of 2.0 MPa (180 ℃) for 1000 hours, the axial deformation rate is ≤ 3%;
Low temperature deflection test
Repeatedly bend 5000 times with a bending radius of 10 times the pipe diameter in an environment of -40 ℃, without cracking or delamination.
Pipes certified by FDA 21 CFR 177.2600 can be used for food processing steam systems.
4、 Multi scenario adaptation: from pharmaceutical sterilization to industrial heat exchange
EPDM steam pipes perform excellently in the following high demand scenarios:
Pharmaceutical sterilization system
Resistant to repeated sterilization with saturated steam at 121 ℃ (≥ 10000 cycles), without the precipitation of plasticizers;
Rubber vulcanization equipment
Transport superheated steam at 160 ℃~180 ℃, resistant to compression permanent deformation (compression rate of 30% × 70h, recovery rate ≥ 90%);
Regional heating pipeline network
When buried underground, the outer adhesive layer is resistant to soil microbial erosion (ASTM G21 test grade 0);
Ship steam system
: The outer adhesive layer is free from corrosion and peeling under salt spray environment (5% NaCl spray × 500h).
The case shows that copper plated steel wire reinforced EPDM pipes have a lifespan of 8 years in the steam pipeline network of chemical plants, which is 300% longer than ordinary rubber pipes.
5、 Lifecycle Management: Installation Standards and Efficiency Optimization Strategies
Systematic solution to extend the service life of steam pipes:
Installation standards
Using stainless steel rotary joints (torque ≤ 60 N · m) to avoid installation distortion stress;
Thermal compensation design
Install Ω - type compensating elbows (radius ≥ 1.5m) every 30 meters of pipeline to absorb thermal expansion;