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Page Title: Figure 2. The dredge William A. Thompson
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ERDC TN-DOER-I4
August 2000
SPECIFICATIONS: Contract specifications have been developed to describe a process by which
the Corps and contractors can cooperate to implement the SI and perform their quality assurance
and quality control duties. The specifications: a) implement the SI design, b) meet the requirements
previously defined, and c) work within existing Corps contracting mechanisms. A Process Action
Team consisting of Corps and Dredging Industry members is reviewing these specifications.
Instrumentation vendors are providing input as well. Whenever appropriate, the specifications will
be revised to assure Corps SI users that everyone's concerns have been addressed. Pertinent
highlights of these specifications are summarized in the following sections.
Data Transfer. The National Marine Electronics Association 0183 data format will define how
the DSS and Ship Server should talk to each other. This standard's proprietary data sentence
structure is used to define custom dredging data strings for related data and for each dredge type.
This standardization can accommodate all of the previously mentioned requirements and can easily
be extended to handle unforeseen data-reporting requirements.
Data-reporting Performance. For each dredge type in the specifications, an overall perform-
ance clause tries to insure that the contractor's DSS not only meets the letter of the specifications
but also works as intended.
Dredge Plant Instrumentation Plan (DPIP). The contract specifications require the contractor
to submit a DPIP, which contains the extensive information about the dredge that the Corps needs
to perform its quality assurance role. Typical information in the DPIP includes the dredge
dimensions, sensor descriptions, sensor calibrations, and quality control procedures.
Inspector Tests. The specifications also detail some of the quality assurance tests that the
inspectors may conduct as part of their duties. This information informs the contractor of possible
occurrences that may detract from his productive working time. For example, to check the dredge's
production meter, the inspector may request the dredge to pump water for a time.
SI IMPLEMENTATION: With the cooperation of the St. Paul District, the dredge William A.
Thompson was used for an example
implementation of the Silent Inspector.
The Thompson is a 6.70-m (22-in.)
Corps pipeline dredge operated by the
St. Paul District (Figure 2). It works
for the Districts on the Upper Missis-
sippi River. Because the Thompson is
Corps-owned, contractual problems
could be avoided while any potential
problems with the system were
worked out. The following section dis-
cusses how the SI system was imple-
mented on the Thompson and presents
some early results.
Figure 2. The dredge William A. Thompson
8

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