Steam hose is used for the hot water and saturated steam transfer during below application, such as coolant hose of cooling equipment, cold and hot water of engine, food processing industry, especially dairy factory. Steam hose can be applied to acid-base environment, but only in low concentrations. Steam hose can be divided into two kinds, that is low pressure steam hose and high pressure steam hose. For low pressure steam hose, its max working pressure can be 0.6 MPA, and temperature to be 164℃. And as for high pressure steam hose, its max working pressure can be high to 1.8MPA, and working temperature to be 210℃. Steam hose also can be sorted with oil resistance type and non-oil resistance type.
Structure
The structure of steam hose is the same with ordinary industrial hose, it consists of 3 parts, that is inner rubber layer, outer rubber layer and medium stainless steel wire braid.
The material of steam hose is always adopted with high quality EPDM rubber, EPDM rubber is high temperature resistance, high temperature steam resistance, Ozone and UV resistant and chemical resistance. The inner medium reinforcement layer always be fiber wire or stainless steel wire, its function is to strengthen the pressure bearing capacity of the steam rubber hose. The function of inner and outer rubber layer is to protect the stainless steel wire from corrosion, and steel wire is the skeleton structure to strengthen the working pressure.
Advantage
Character
Pressure: common working pressure is within 7 bar, and max working pressure can be high to 17 bar
Temperature: ordinary working range is from -40 ℃ to +208 ℃.
Resistance: common resistance coefficient is less than 109Ω.
Table 1 Physical Properties of Rubber Material
Performance
Unit
Requirement
Test Method
tensile strength (minimum)
Mpa
inner layer
outer layer
GB/T 528
elongation at break (minimum)
%
8
8
GB/T 528
change in tensile strength after aging (maximum)
%
50
50
GB/T 3512
change in elongation at break after aging (maximum)
%
50
carbon black filled compounds (max)
mm³
-----
200
GB/T 9867-2008
non-carbon black filled compounds (max, pigmented)
mm³
-----
400
volume change (max)
%
-----
100
GB/T 1690
Table 2 Physical Properties of Hose Assembly
Ω
Ω
Ω
≤10²/M型组合件
≤106/组合件
≤109/Ω型内衬层与外覆层间电阻
GB/T 9572-2001 方法4
GB/T 9572-2001 方法 3.4, 3.5 或3.6
Performance
Unit
Requirement
Test Method
Flexible Hose
Burst Pressure (minimum)
Mpa
10 times the maximum working pressure
GB/T 5563
Verification Pressure
Mpa
no leakage or distortion at 5 times the maximum working pressure
GB/T 5563
Interlayer Bonding Strength (minimum)
kN/m
2.4
GB/T 14905
Bending Test (without pressure, minimum)
T/D
0.8
ISO 1746
Verify Length Change under Pressure
%
-3~+8
GB/T 5563
Torque under Proof Pressure (max)
(º)/m
10
GB/T 5563
Ozone Resistance of Outer Layer
----
no visible cracks when magnified 2x
GB/T 24134-2009 中方法3，相对湿度（55±10）%，臭氧浓度（50±5）*10-9，伸长率20%, 湿度40℃
Hose Assemblies
Verification Pressure
Mpa
no leakage or distortion at 5 times the maximum working pressure
GB/T 5563
Resistance
Short-term Steam Test
----
第10章
第10章
Long term Steam Test
----
第10章
第10章
Part No.
Inner Diameter
Outer Diameter
Working Pressure
Burst Pressure
Weight
mm
inch
mm
bar
psi
mpa
bar
psi
mpa
kg/m
QTSH-1
13
1/2
25
17
250
1.7
51
750
5.1
0.53
QTSH-2
19
3/4
32
17
250
1.7
51
750
5.1
0.68
QTSH-3
25
1
39
17
250
1.7
51
750
5.1
0.9
QTSH-4
32
1-1/4
46
17
250
1.7
51
750
5.1
1.3
QTSH-5
38
1-1/2
54
17
250
1.7
51
750
5.1
1.6
QTSH-6
51
2
67
17
250
1.7
51
750
5.1
2.2
QTSH-7
63
2-1/2
83
17
250
1.7
51
750
5.1
3.8
QTSH-8
76
3
95
17
250
1.7
51
750
5.1
4.6
QTSH-9
102
4
124
17
250
1.751
51
750
5.1
6.5
