In the thermal oil tracing system of chemical plants, steam hoses are not only exposed to continuous thermal radiation from high-temperature pipe galleries for a long time, but also face multiple threats such as thermal oil leakage, environmental chemical splashing, and seasonal UV aging. The outer rubber layer of ordinary hoses will harden and crack within a few months under such working conditions, weakening the mechanical protection ability, resulting in exposed reinforcement layer and pressure failure. The outer layer of EPDM steam hose with heat resistance, flame retardancy and anti-aging properties is just the professional solution for this scenario - the saturated molecular chain structure of EPDM is used to resist ozone and thermal oxygen erosion, the flame retardant formula is used to build a fire barrier, and the needle exhaust technology is used to prevent high-temperature delamination, which has become a reliable guarantee of "flame retardancy, heat resistance, and longevity" in the heat tracing system of the heat transfer oil in the chemical plant.
1、 "Anti aging gene" of outer layer EPDM: saturated main chain and multiple protection system
The challenge posed by the thermal oil tracing pipe gallery environment in chemical plants to the outer rubber layer of hoses far exceeds that of conventional outdoor applications. The continuous radiation of heat from high-temperature pipelines (with a heat tracing temperature of over 200 ℃), high concentration of ozone in the atmosphere (in the refining plant area), and the synergistic effect of ultraviolet radiation and chemical splashing - all three factors combine to significantly shorten the lifespan of ordinary rubber outer rubber.
The reason why EPDM outer layer is capable of handling this working condition is rooted in its saturated molecular main chain structure - it does not contain unsaturated double bonds that are easily attacked by ozone, and has natural inertness to ozone attack. The relevant product information clearly states that the EPDM outer layer has excellent ozone resistance, weather resistance, and mechanical wear resistance, and is suitable for harsh industrial environments such as refineries and chemical plants.
In terms of anti-aging formula, the EPDM outer rubber layer is further strengthened by multiple means: antioxidants (such as hindered phenols) continuously capture free radicals generated by thermal oxidative aging, and delay molecular chain breaking; Anti UV absorbers (such as benzophenone derivatives) convert harmful UV light into thermal energy and reduce surface photodegradation; Some products adopt the water wrapped nylon cloth pressure increasing winding molding process, which makes the outer rubber layer denser than ordinary smooth rubber hoses and delays the "bubble" delamination caused by gas permeation.
2、 Flame retardant and heat-resistant synergy: a safety barrier for heat tracing scenarios in chemical plants
The heat transfer oil tracing pipe gallery belongs to a high-temperature flammable environment - once the outer rubber layer of the hose ages or an external fire source catches fire, it may spread along the pipeline and cause a chain accident. The flame retardant design of EPDM outer layer builds a defense line from two aspects:
The self extinguishing property of the material comes from the halogen-free flame retardant system introduced in the EPDM formula. The latest patented technology shows that adding melamine polyphosphate/aluminum hydroxide/magnesium hydroxide composite flame retardant to EPDM can rapidly carbon the surface of the material during combustion testing, accompanied by strong smoke suppression effect, and greatly improve the droplet phenomenon. This technological path enables the EPDM outer rubber to quickly form a dense carbonized layer upon contact with an open flame, blocking the transmission of flame to the inner layer.
Thermal radiation isolation is another "invisible defense line" of EPDM outer layer. The heat resistance level of EPDM makes it less prone to softening and deformation in continuous high-temperature pipe gallery environments, maintaining physical protection for the reinforcement layer. According to the technical parameters of the related products, the outer rubber layer of the steam hose can maintain its performance in a continuous high temperature environment of up to 210 ℃, which is suitable for the harsh working conditions of the heat transfer oil tracing system in chemical plants.
3、 Heat tracing scenario adaptation: system integration from heat resistance to aging resistance
The thermal oil tracing system requires the hose to have a "three-layer composite" reliability: the inner rubber layer can withstand the internal pressure and erosion of high-temperature steam or thermal oil; Enhanced layer bearing working pressure (usually 1.0-1.6MPa, with blasting pressure 4-10 times the working pressure); The outer glue layer undertakes the external protection mission of "high-temperature flame retardancy+anti-aging+mechanical damage prevention".
Needle punching exhaust technology is a unique design of the outer layer of steam hoses - the outer layer of the hose is punched with equidistant micro holes along the pipe body to release the accumulated gas pressure between layers due to temperature cycling, avoiding interlayer foaming and peeling. This design is particularly critical in the intermittent operation of the heat tracing system - if the interlayer gas cannot be discharged during the temperature rise and fall cycle, it may cause the outer rubber layer to bulge or even burst, and the flame retardant protection may fail.
Installation and maintenance points: The steam hose in the thermal oil tracing system of chemical plants should be kept away from open flames and high temperature sources; If passing through a firewall, additional protection should be provided using fire-resistant conduit. In daily inspections, it is important to focus on observing whether the outer adhesive layer shows signs of cracking or hardening - the flexibility of the outer adhesive can be an important indicator of the degree of aging. When there are deep cracks or hardening in the outer adhesive layer, it indicates that the protective performance has decreased and should be replaced in a timely manner.
To sum up, the steam hose with heat resistant and flame retardant outer layer and anti-aging crack resistance perfectly meets the systematic requirements of the heat transfer oil heat tracing system of the chemical plant for "flame retardancy, heat resistance and anti-aging" with its three core technologies of ozone and ultraviolet resistance genes of EPDM saturated molecular chain, self extinguishing protection of halogen-free flame retardant formula, and interlayer stability of needle exhaust technology. From the refining equipment pipe gallery to the steam pipe network of the power plant, every stable service under long-term high temperature exposure points to the same goal: to provide reliable flame retardant and aging resistant guarantees for heat transfer oil tracing and steam transportation in the high-temperature environment of chemical plants.
在线留言