Some standard content:
Chemical Industry Standard of the People's Republic of China
Drainage and suction rubber hose
1 Subject content and scope of application
HG/T 2490-93
Replaces HG 4-1457-82
This standard specifies the technical requirements, test methods, inspection rules, etc. of drainage and suction rubber hoses. This standard is applicable to drainage and suction rubber hoses used in dredging projects such as harbors, rivers, and lakes. The applicable temperature is -20~+40.
2 Reference standards
GB/T528 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T1689 Determination of wear resistance of vulcanized rubber (using Ackerstedt abrasion machine) GB/T 3512
Test method for hot air aging of rubber
GE/T5562 Physical test method for rubber layer of hose GB/T 5563
GB/T 5567
GB/T 9573
Hose hydraulic test method
Rubber, plastic hoses and hose assemblies Determination of vacuum performance Rubber. Plastic hose and hose assembly dimensional measurement method GB/T9576 Rubber, plastic hose and hose assembly selection, storage, use and maintenance guide GB/T 9577 Rubber, plastic hose and hose assembly marking, packaging and transportation rules GB/T 14905
Determination of the bonding strength between the layers of rubber and plastic hoses HGT2185 Appearance quality of rubber hoses
3 Product structure, model, grade, size and product marking 3.1 Structure
The mud discharge rubber hose consists of an inner rubber layer, a reinforcement layer and an outer rubber layer or a flange joint. The mud suction rubber hose consists of an inner rubber layer, a reinforcement layer with a metal spiral wire (or a metal ring) and an outer rubber layer or a flange joint 3.2 Models and grades
3.2.1 Model
Type 1 straight-tube structure rubber hose Tube
Grommet-type rubber hose
Rubber flange-type rubber hose
Steel flange-type rubber hose
3.2.2 Level
Type 1, 2, 3, and 4 mud-discharging rubber hoses are divided into four levels according to working pressure (see Table 1), approved by the Ministry of Chemical Industry of the People's Republic of China on July 5, 1993 and implemented on December 1, 1994
Type 1, 2.3
3.3 Specifications and dimensions
HG/T2490—93
.0. 59
3.3.1 The dimensions of the straight type drainage and suction rubber hose shall comply with the provisions of Table 2. Table 2
Nominal inner diameter
Tolerance, ±
Joint size
The dimensions of the suction rubber hose shall comply with the provisions of Table 3, ±
The main
rubber thickness shall not be less than
Inner rubber layer
Outer rubber layer
Tolerance, ±
HG / T.490 - 93
Size of flared joint
cemetery, main
rubber flange type drainage and suction rubber hose size shall comply with the provisions of Table 4, Table 4
Nominal inner diameter
Tolerance, ±
rubber flange sizewwW.bzxz.Net
Tolerance, ±
rubber layer thickness, not less than
Inner rubber layer
Distance between hole centers
Outer rubber layer
Depth of clearance
G/T 2490 — 93
3. 3. Size of steel flange type drainage and suction rubber hose shall comply with the provisions of Figure 1 and Table 5. HA
metal joint
Nominal inner diameter
205±3
254 ± 3
305±5
338±5
388 ± 5
.310±3
560± 5
630±5
660±5
700 ±s
Inner rubber layer thickness
Flange outer diameter
(reference value)
Joint thread thickness
Selected flange thickness
(Dream)
Outer rubber layer
Reinforcement layer
Inner rubber housing
Center diameter
345± 1. 0
390± 1. 0
435± 1. 0
495 ± 1. 0
650± 1. 0
690 ± 1. 0
750±1. 0
765±1. 0
780 ± t. Center
27 ±1
Nominal inner diameter
710±s
760±5||tt| |800 ± 5
840±5
860±3
HG/ T 2499 --- 93
Flange outer diameter Flange thickness Number of joint threads Inner rubber layer thickness Seat
(reference value)
(test value)
①Table 2, 3, 4 and 5 are not included in the specifications and shall be determined by negotiation between the supply and demand parties, min
Center network diameter
Device housing 1. Center
903±1. 0
970±1. 0
1010±1.0
China steel flange type special structure rubber sleeve and sleeve length shall be determined by negotiation between the supply and demand parties, 3.4 Length
Hose length shall be proposed by the user and agreed upon by the supply and demand parties, and the length tolerance shall be ±2% of the total length of the hose. 3.5 Product marking
Marking content: name, specification, model, grade, standard number, marking example:
Mud discharge rubber hose
4 Technical requirements
Diameter Φ700mm×20P×1.5m
The physical and mechanical properties of the rubber material shall comply with the provisions of Table 6, Table 6
Tensile strength, MPa
Elongation at break, %
Hot air aging. 70℃ ×72 h
Abrasion, cm\
Tensile strength change rate. %
Change rate of tearing elongation, %
HG 2490
Standard number
Inner rubber layer
+25~-25
+10～-30
27 ±1
Outer rubber layer
4.2Punching performance
HG / T 2490 —93
4.2.1 When the mud discharge rubber hose is subjected to a constant pressure test at 1.5 times the specified working pressure, there shall be no leakage, local bubbling or other abnormal phenomena.
4.2.2 The bursting pressure of the mud discharge rubber hose shall not be less than 3 times the working pressure.4.2.3 When the mud discharge rubber hose is subjected to the pipe deformation test, the length and outer diameter change rate shall comply with the provisions of Table 7. Table 7
Test items
Length and outer diameter change rate during pressure increase. %
Outer diameter change rate during pressure increase, %
4.3 Vacuum performance
Test pressure
Maximum working pressure, ±
1:5 times the maximum working pressure, SS
Maximum working pressure, SS
1.5 times the maximum working pressure, SS
When the vacuum degree of the mud suction rubber hose reaches 80Pa, there shall be no suction fan, delamination or other abnormal phenomena. 4.4 Adhesion performance
排. The bonding strength between each layer of the mud suction rubber hose shall not be less than 1.5kN/m. 4.5 Appearance quality
4.5.1 The appearance quality of the mud suction rubber hose shall comply with the provisions of HG/T2185. 10
4.5.2 The flange sealing surface of the rubber hose with flange joint shall be smooth and flat, and the centers of the two flange connection holes shall be on the same straight line. 5 Test method
5.1 The specification, size and tolerance measurement of the mud suction rubber hose shall be carried out in accordance with GB9573. 5.2 The tensile strength and breaking elongation of the rubber material of the mud suction rubber hose shall be measured in accordance with GB/T5562 and GB/T528, using a type 1 cutter.
5.3排. The hot air aging test of the rubber material of the mud suction rubber hose shall be carried out in accordance with GB/T3512. 5.4 The wear performance test of the rubber material of the drainage and suction rubber hose shall be carried out in accordance with GB/T1689. 5.5 The hydraulic performance test of the drainage rubber hose shall be carried out in accordance with GB/T5563. 5.6 The vacuum performance test of the suction rubber hose shall be carried out in accordance with GB/T5567. 5.7 The bonding strength test of the drainage and suction rubber hose shall be carried out in accordance with GB/T14905. 6 Inspection rules
The drainage and suction rubber hoses shall be inspected and accepted in batches by the technical inspection department of the manufacturer. Each batch of products must be accompanied by a quality certificate before leaving the factory. 6.2 The same type of rubber hoses are grouped into one batch. The number of rubber hoses for mud discharge shall not exceed 300 per batch, and the number of rubber hoses for mud suction shall not exceed 50 per batch.
6.3 The specifications, dimensions and appearance quality of rubber hoses for mud discharge and mud suction shall be inspected one by one. 64 The physical and mechanical properties test of rubber materials for mud discharge and mud suction rubber hoses shall be conducted once per batch. If there is less than one batch, the test shall be conducted at least once a month.
6.5 The hydraulic performance test of rubber hoses for mud discharge shall be conducted once per batch. 6.6 The vacuum performance test of rubber hoses for mud suction shall be conducted once per batch. 6.7 If one of the indicators in the above performance tests is unqualified, double samples shall be taken from the batch of rubber materials or the batch of products, and the unqualified items shall be retested. If one of the indicators is still unqualified after the retest, the batch of products shall be unqualified. 6
Marking, packaging, transportation, storage and use HG/T 2490-93
7.1 The marking, packaging and transportation of rubber hoses shall be in accordance with the provisions of GB/T9577. 7.2 The selection, storage, use and maintenance of rubber hoses shall be in accordance with the provisions of GB:/T9576. Additional notes:
This standard is issued by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products, and this standard was drafted by Shanghai Rubber General Factory. The drafters of this standard are Ji Wencai, Chen Changyu, Zhou Guoliang and Yu Baozhu. This standard refers to the Japanese Industrial Standard JTSF 3995-1991 "Rubber Sleeves for Overboard Discharge Pipes of Dredgers"
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