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Dynamic Plate Test Devices (DPT)

Dynamic Plate Test Device
 

Dynamic Plate Test Device is a term used to describe various types of equipment primarily used to assess the in situ performance and strength of pavements and foundations or granular materials using a test load dynamically applied through a circular plate. They include devices commonly termed Falling Weight Deflectometers.

Dynamic Plate Test devices can either be hand held machines or devices built into a vehicle or mounted on a trailer and towed behind a vehicle. Each device incorporates a circular loading plate that is placed onto the surface under test. The device applies a known load to the plate creating an impact load. The vertical deflections produced by the impact are measured at the centre of the plate and optionally at a series of radial positions from the centre. The measured deflections are a function of the applied load and are used to determine the structural condition of the structure under test.

DPTs are classified by the load that they can apply to the test plate. There are four main classifications, A to D:

Class	Generic name	Load Range (kN)
A	Lightweight Deflectometer (LWD)	1-15
B	Falling Weight Deflectometer (FWD)	30-120
C	Heavyweight Deflectometer (HWD)	30-240
D	Super-Heavyweight Deflectometer (SHWD)	30-300

Class A devices are typically used for assessing the in situ structural condition of pavement foundations in the construction of new roads, airfields, ports and other structures. Class B, C and D devices are typically used for assessing the structural condition of in-service road pavements, airfields, ports and other structures.

The Accreditation and QA requirements for Class B, C or D Dynamic Plate Devices are given in the Accreditation and QA specification .

Accreditation_and_QA_of__DPT_devices Issue 2.0 July 2016

If you are looking for a contractor to undertake a survey using a Class B, C or D Dynamic Plate Device on your behalf, you may wish to check the list of DPT survey devices below. On this page you can also find the latest accreditation certificates. In this table machines are referred to as having met criteria if they have met the mandatory criteria as defined in the Accreditation and QA specification for these devices. Some Network Authorities may also require a specific level of performance in some or all of the additional tests. Please see the certificates for more detail on the performance of these devices in these additional tests.The Department for Transport provides guidance on the usage of DPTs in the assessment of new foundation construction  and for in-service pavement assessment.

Certificates from previous years can be found here.

ID	Serial Number	Class	Operating Company	Met criteria	Certificate
2	8002 102	B	AECOM	TBC	Awaiting fee
5	8082 050	C	AECOM	TBC	Awaiting fee
6	8082 018	C	PMS Ltd.	Yes	2017 DPT M06 (8082-018).pdf
8	8002 028	B	AECOM	TBC	Awaiting fee
9	8002 136	B	PMS Ltd.	Yes	2017 DPT M09 (8002-136).pdf
10	8002 192	B	AECOM	TBC	Awaiting fee
11	8002 187	B	Forth Bridge constructors JV	TBC	Awaiting fee
13	8082 029	C	AECOM	TBC	Awaiting fee
15	8002 203	B	CET Safehouse	TBC	Awaiting fee
16	8002 214	B	PTS	TBC	Awaiting fee
28	8002 271	B	Pulse Surveying	Yes	2017 DPT M28 (8002-271).pdf
30	8002 173	B	PMS Ltd.	Yes	2017 DPT M30 (8002-173).pdf
32	8082 069	C	PTS	TBC	Awaiting fee
33	8082 070	C	PTS	TBC	Awaiting fee
34	8082 108	C	PTS	TBC	Awaiting fee
36	PRI2500 0608-303	C	James Fisher Testing Services	TBC	Awaiting fee
37	8002 352	B	Stanger	Yes	2017 DPT M37 (8002-352).pdf
38	PRI1500 1111-448	B	Milestone	TBC	Awaiting fee
39	8002 388	B	TRL	Yes	2017 DPT M39 (8002-388).pdf
40	8012 002	B	Dynatest	TBC	Awaiting fee
41	8082 145	C	ALC (MoD)	TBC	Currently unassessed
42	8082 149	C	ALC (MoD)	Yes	2017 DPT M42 (8082-149).pdf
44	8082 156	C	Dynatest	TBC	Currently unassessed
45	PRI2100 0903-088	B	Atlas Geophysical	No	2017 DPT M45 (PRI2100 0903-088).pdf