High-Energy Drop Weight Testers from 20,000 J

Zwick DWT high-energy drop weight testers are used for testing and evaluating fracture surfaces of ferritic steels. The test method is described as a drop weight test in the following standards: API-RP 5L3, DIN EN 10274 and ASTM-E 436.
Fallwerk DWT (Groß-Fallwerk)

Key Advantages and Features

Description

  • In the test, weights fall on to a specimen supported at both ends and break it. The specimen is provided with a cold-pressed notch, this being the point at which it breaks under the impact effect.
  • DWT drop weight testers are available in the following energies: 20, 30, 40, 60, 80 and 100 KJ
  • The standard maximum drop-height for all sizes is 5m. DWT 20 - 40 are alternatively available with a maximum drop-height of 2.5 m.

Advantages & features

  • Modular "building block" system with six sizes and two drop-heights.
  • Pneumatic specimen feed and fixture loading outside the test area guarantees fast, reliable feeding within the time required by the standard.
  • Quick-change system for anvils.
  • Flexure table with integrated centering unit. Different specimen thicknesses can be set quickly and easily.
  • Electrical and mechanical test-area safeguards with safety circuit - the test does not begin until all safety switch contacts have been interrogated.
  • Electronically monitored, pneumatically operated safety interlocking to guard the test area against accidents.
  • Touchscreen operation with electronic display of drop height, drop energy, drop weight and impact velocity.
  • The steplessly adjustable drop height is automatically achieved after input of drop weight and drop energy.
  • The drop weight is divided into individual weights to allow adjustment of drop energy. The weight is measured electronically, eliminating input errors.
  • Four high-performance reservoir-type shock absorbers for safe, reliable drop-weight arrest.
  • Controlled low-temperature cooler for accurately maintained specimen temperature.
  • Plan view of foundation included in delivery.
  • The connecting plate, anchor bolts and grout included in delivery can be supplied in advance if required.
Working area for a Zwick drop weight tester
  • Test fixtures are fitted outside the test area. 
  • The specimens are fed pneumatically within 10 seconds.

Remove the specimens from the bath and break as described herein within a time period of 10-s

ASTM E436

Specimens for High-Energy Drop Weight Testers

Metal specimen for drop weight tests
In the test, weights fall on to a specimen supported at both ends and break it. The specimen is provided with a cold-pressed notch, this being the point at which it breaks under the impact effect.

Technical Overview

20 kJ/30 kJ/40 kJ

Model

DWT20-2.5

DWT20-5

DWT30-2.5

DWT30-5

DWT40-2.5

DWT40-5

Energy

20000 J

20000 J

30000 J

30000 J

40000 J

40000 J

Item No.

640064

640070

640071

640072

640073

640074

Load frame

Max. drop height

2.5

5

2.5

5

2.5

5

m

Dimensions

A - overall height

5900

8000

5750

8000

5900

7960

mm

B - width

3100

3060

3210

3060

3210

3060

mm

C - width

1140

1140

1140

1140

1140

1140

mm

D - width

1965

1965

1965

1965

1965

1965

mm

Foundation dimensions

2150 x 2150

2150 x 2150

2150 x 2150

2150 x 2150

2150 x 2150

2150 x 2150

mm

Max. specimen dimensions

Length

305

305

305

305

305

305

mm

Width

50

50

50

50

50

50

mm

Height

76

76

76

76

76

76

mm

Drop weight

820

410

1225

612

1630

820

kg

Min. drop weight

460

410

457

457

480

456

kg

Additional single weights

6.0 kg

-

-

8

6

2

-

pieces

15.0 kg

2

-

15

8

76

15

pieces

Total weight

6100

6350

6850

7050

7150

7050

kg

Impact velocity

7

9.9

7

9.9

7

9.9

m/s

Lift-unit speeds

fast

18

18

18

18

18

18

m/min

slow

3

3

3

3

3

3

m/min

Height

Low-temperature cooling unit

Temperature

-80

°C

Max. temperature variation

±1

°C

Number of specimens

3

pieces

Specimen dimensions

50 x 76 x 305

mm

Low-temperature cooler

Temperature

-80

-80

-80

-80

-80

°C

Max. temperature variation

±1

±1

±1

±1

±1

°C

Number of specimens

3

3

3

3

3

pieces

Specimen dimensions

50 x 76 x 305

50 x 76 x 305

50 x 76 x 305

50 x 76 x 305

50 x 76 x 305

mm

Electrical supply data

Electrical supply

3x 400

3x 400

3x 400

3x 400

3x 400

3x 400

V, N/PE

Power consumption

11

7

11

5

11

5

kVA

Power supply frequency

50

50

50

50

50

50

Hz

Compressed air

8

8

8

8

8

8

bar

Air consumption

600

600

600

600

600

600

l/min

Ambient temperature

+10 to +35

+10 to +35

+10 to +35

+10 to +35

+10 to +35

+10 to +35

°C

Humidity

20 to 90

20 to 90

20 to 90

20 to 90

20 to 90

20 to 90

%

60 kJ/80 kJ/100 kJ

Model

DWT60-5

DWT80-5

DWT100-5

Energy

60000 J

80000 J

100,000 J

Item No.

003972

011273

011272

Load frame

Total weight

9300

9800

12300

kg

Max. drop height

0.5 to 5

0.5 to 5

0.5 to 5

m

Impact velocity

3.1 to 9.9

3.1 to 9.9

3.1 to 9.9

m/s

Lift-unit speeds

fast

18

18

18

m/min

slow

3

3

3

m/min

Dimensions

A - overall height

8000

8000

8580

mm

B - width

3060

3060

3060

mm

C - width

1360

1300

1360

mm

D - width

2500

2500

2500

mm

Foundation dimensions

2550 x 2550

2550 x 2550

3050 x 3050

mm

Drop weight

1225

1630

2040

kg

Max. specimen dimensions

Length

305

305

305

mm

Width

50

50

50

mm

height

76

76

76

mm

Min. drop weight

approx. 831

831

856

kg

Additional single weights

11.0 kg

6

2

(-)

pieces

13.5 kg

-

2

(-)

pieces

16.5 kg

-

-

2

pieces

20.5 kg

-

2

(-)

pieces

27.5 kg

12

26

42

pieces

Impact velocity

Lift-unit speeds

fast

slow

height

Low-temperature cooler

Temperature

-80

-80

-80

°C

Max. temperature variation

±1

±1

± 1

°C

Number of specimens (number @ dimensions)

10 @ (10x77x305)

10 @ (10x77x305)

10 at (10x77x305)

pieces

Number of specimens (number @ dimensions)

Electrical supply data

Electrical supply

3x 400

3x 400

V, N/PE

Power consumption

11

11

kVA

Power supply frequency

50

50

Hz

Compressed air

8

8

bar

Air consumption

205

205

l/min

Ambient temperature

+10 to +35

+10 to +35

°C

Humidity

20 to 90

20 to 90

%

Electrical supply

Connected loads

Power consumption

11

kVA

Power supply frequency

50

Hz

Compressed air

8

bar

Air consumption

205

l/min

Ambient temperature

+10 to +35

°C

Humidity

Design

Large drop weight tester DWT 40000 J

Drop Weight Tests

For large oil and gas mains, specimens from the pipe wall are subjected to a drop weight test to API 5L. Specimens with a height equal to the original wall thickness and widths of several centimeters are subjected to abrupt loading via a vertically falling weight with a tup. The energy (weight and release height) is set so that the specimen breaks and the fracture surface can be assessed visually.
Hydraulic notch press

Hydraulic Notching Press as per API RP 5L3

The hydraulic notching press is used to prepare specimens for high-energy drop weight testers. Specimens are notched as per API RP 5L3 (not suitable for chevron notches).

Cooler for Tests at Low Temperatures (Between -80 and +30°C)

The low-temperature circulation bath for steel specimens complies with established test standards (for example, API RP 5L3). It can accommodate 3 specimens for a specimen thickness of 50 mm or 10 specimens for a specimen thickness of 10 mm. An integrated coolant circulation system and high heating/cooling capacity ensures short heating and cooling times.

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