High-Energy Drop Weight Testers from 20,000 J

ZwickRoell 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.

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Technical overview
Drop weight tests
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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 ZwickRoell 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

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 DWT	20-2.5	20-5	30-2.5	30-5	40-2.5	40-5
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
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	-	pcs.
15.0 kg	2	-	15	8	76	15	pcs.
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
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
Low-temperature cooler
Temperature	-80	-80	-80	-80	-80	-80	°C
Max. temperature variation	±1	±1	±1	±1	± 1	±1	°C
Number of specimens	3	3	3	3	3	3	pcs.
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	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 ... +35	+10 ... +35	+10 ... +35	+10 ... +35	+10 to +35	+10 ... +35	°C
Humidity	20 ... 90	20 ... 90	20 ... 90	20 ... 90	20 to 90	20 ... 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
Max. drop height	0.5 ... 5	0.5 ... 5	0.5 ... 5	m
Drop weight	1225	1630	2040	kg
Min. drop weight	approx. 831	831	856	kg
Additional single weights
11.0 kg	6	2	-	pcs.
13.5 kg	-	2	-	pcs.
16.5 kg	-	-	2	pcs.
20.5 kg	-	2	-	pcs.
27.5 kg	12	26	42	pcs.
Total weight	9300	9800	12300	kg
Impact velocity	3.1 ... 9.9	3.1 ... 9.9	3.1 ... 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
Max. specimen dimensions
Length	305	305	305	mm
Width	50	50	50	mm
Height	76	76	76	mm
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 @ (10x77x305)	pcs.
Electrical supply data
Electrical supply	3x 400	3x 400	3x 400	V, N/PE
Power consumption	11	11	11	kVA
Power supply frequency	50	50	50	Hz
Compressed air	8	8	8	bar
Air consumption	205	205	205	l/min
Ambient temperature	+10 ... +35	+10 ... +35	+10 ... +35	°C
Humidity	20 ... 90	20 ... 90	20 ... 90	%

Design

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 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.