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|Product Name:||Drop Weight Impact Test Machine||Impact Energy:||50000J|
|Total Weight Of Tup:||1020kg||Standard:||API RP 5L*3|
|Advantage:||Fully Automatic Cooling And Specimen Feeding||Drop Height:||1275~2610|
Drop Weight Impact Test Machine DWTT 50000J API RP 5L*3 Drop-Weight Tear Tests on Line Pipe DIT504C
This type of machine is especially designed for drop-weight tear tests of ferritic steels
GB/T 8363, ASTM E436, API RP 5L3, GOST 30456
1. SIMENS PLC controls and touch screen provide high reliability and versatility.
2. Automatic specimen feeding and automatic positing
3. Frame structure is made of solid steel plate with high stability under impact
4. Striker is made of high strength steel plate with high impact resistance
5. Use chain to lift striker with high precision in height
6. Self-lock design for striker clamping
7. Full-closed safety shield
8. Special design tools for support change
The bottom plate is made of solid steel plate, mass is up to 2100kg. Anvil is located onto the center of the bottom plate. Impact force onto the frame will rapidly transmit to the ground. As the impact force applies to the center of the main frame which is at the center of the foundation, foundation area is not so big (3mx3m), after long use, foundation will not decline by vibration, and horizontal level of the main frame will not change too.
The main frame is supported by four columns. Each column is divided by upper and lower part. The lower part of the columns is cone-shape cast iron; the upper part is high strength steel pipe. Cone-shape of lower part has higher anti-decline ability than cylinder-shape. Cast iron has stronger vibration resistance and isolation, the vibration caused by impact force will not transmit to the top plate, therefore, the main frame has not apparent vibration for each impact test.
Specimen support and anvilSpecimen support and anvil
Anvil is split-type design, separated from support. It is simple to change the anvil after wearing. Anvil radius contacting specimen is R15.5mm, made of 6CrW2Si material, with HRC58~65 hardness after heat treatment. This material is one kind of tool steel, able to bear high speed impact, with high hardness. Various size of spacers are used to satisfy specimens with different thickness ranging 3~10mm, 10-15mm, 15-20mm, 20-25mm, 25-30mm, 30-35mm, 35-40mm, 40~45mm, 45~50mm.
Striker consists of a few parts, which are made of separately machined steel plate. It features high impact resistance ability. Junction between each part is fixed by pin, jointed by high strength screw bolt. Tup is made of alloy steel 6CrW2Si with good impact resistance, little abrasion, long service life, and simple to change. The weights are separate, easy to change. Connection between weights is alignment pin with reliability.
Imported servo motor is used for the lifting system, with small size, light weight, high efficiency, low noise, and high stability.
Compared with common motor, servo motor is better in accuracy, response characteristic, over-load resistance, speed change performance, and torque characteristic.
Use chain to lift striker with smaller elasticity and higher accuracy than wire rope. Chain has higher strength, higher abrasion resistance and safer than wire rope. The lifting motor is located at the bottom of the frame, easy to mount and maintain.
API 5L*3 Recommended Practice for Conducting Drop-Weight TearTests on Line Pipe
1.1 These procedures describe a recommended method for conducting drop-weight tear tests to measure the fracture appearance or fracture ductility of tine pipe as referenced in API Specification 5L, Specification fur Line Pipe.
1.2 Metric conversions of US customary units are shown in parenthesis in the test, figures, and tables. See Appendix B for metric conversion factors.
4.1 The testing machine may be of any configuration that has sufficient energy to completely break the specimens in one impact.
4.2 The velocity of the hammer at impact shall be in the
4.3 The specimen shall be inserted in the testing machine so that the notch is lined up with the centerline of the hammer tip within ' / 6 in. (1.59 mm). The notch should also be
centered between the supports of the anvil.
4.4 The radius of the anvil supports for the specimen should not be larger than % in. (15.9 mm). Larger radii have I been found to contribute to specimen jamming.
4.5 As a guide in the design of the Dropweight Tear Test equipment, the relationship between the maximum energy to fracture Charpy V-notch (C") specimens and pressed notch and chevron notch DWiT specimens is presented in Figure I .
The pressed notch is the preferred notch for lower toughness line-pipe steels.
The pressed notch shall be pressed to the depth shown in Figure 2 with a sharp (no radius) tool steel chisel with an included angle of 45" 12'. Machined notches are prohibited.
The notch radius obtained with a sharp tool steel chisel is normally between 0.0005 to 0.001 in. (0.0127 to 0.0254 mm). When many specimens are to be tested, it is
helpful to use a jig which will guide the chisel and stop it at the proper depth.
|Maximum energy (J)||50000|
|Tup mass (kg)||1600|
|Tup mass accuracy||±1%|
|Weight mass (kg)||
|Weight mass accuracy||±0.5%|
|Total weight of tup||1960|
|Velocity of drop (m/s)||5~7.14|
|Hardness of tup nose||HRC58~62|
|Radius of tup nose(mm)||R25±0.1|
|Hardness of support anvil||HRC58~62|
|Alignment accuracy of center of tup nose, specimen and anvil center (mm)||≤±1.5|
|Support anvil span (mm)||
254±1.5 (ASTM E436 & API RP*5L3)
250±2 (GOST 30456-97)
Specimen dimension (mm)
(length x width x thickness)
(305±19) × (76.2±3) × (3~50)mm (ASTM E436 & API RP*5L3)
(300±5) x (75±2) x (3~50)mm (GOST 30456-97)
|Power supply||3-phase, 5-line, AC 380V, 50Hz|
|Power requirements||20A, 5kW|