ASTM D7764-12
(Practice)Standard Practice for Pre-Installation Acceptance Testing of Vibrating Wire Piezometers
Standard Practice for Pre-Installation Acceptance Testing of Vibrating Wire Piezometers
SIGNIFICANCE AND USE
4.1 Vibrating wire piezometers are typically not recoverable after installation. Replacement, which involves drilling a new borehole, is expensive and sometimes impossible. Thus it is important to be certain that the sensor is operational before it is installed.
4.2 Lacking sophisticated testing facilities, field testers must use equipment that is at hand. But in so doing, field testers should not expect to achieve the same accuracy and precision that manufacturers state on the sensor calibration record. Instead, field testers should look for obvious non-conformances, as explained in the procedures.
4.3 This standard practice is not meant to restrict the use of other appropriate acceptance tests and procedures.Note 1—Notwithstanding the statements on precision and bias contained in this practice, the precision of this practice is dependent on the competence of the personnel performing it and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing. Users of this practice are cautioned that compliance with Practice D3740 does not itself ensure reliable testing. Reliable testing depends on many factors; Practice D3740 provides a means of evaluating some of these factors.
SCOPE
1.1 This practice describes two acceptance tests for a vibrating wire piezometer: a zero test and a down-hole test. The two tests can help a user verify that the piezometer is operating properly before it is installed.
1.2 This practice offers an organized collection of information or a series of options and does not recommend a specific course of action. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project's many unique aspects. The word “standard” in the title of this document means only that the document has been approved through the ASTM consensus process.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D7764 − 12
Standard Practice for
Pre-Installation Acceptance Testing of Vibrating Wire
1
Piezometers
This standard is issued under the fixed designation D7764; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Used in Engineering Design and Construction
1.1 This practice describes two acceptance tests for a
3. Terminology
vibratingwirepiezometer:azerotestandadown-holetest.The
two tests can help a user verify that the piezometer is operating
3.1 Definitions:
properly before it is installed. 3.1.1 For general definitions, see Terminology D653.
3.1.2 absolute pressure, n—a pressure value that includes
1.2 This practice offers an organized collection of informa-
the effect of atmospheric pressure.
tion or a series of options and does not recommend a specific
course of action. This document cannot replace education or
3.1.3 gauge pressure, n—a pressure value that excludes the
experience and should be used in conjunction with professional effect of atmospheric pressure.
judgment. Not all aspects of this practice may be applicable in
3.1.4 vibrating wire piezometer, n—atypeofpressuresensor
all circumstances. This ASTM standard is not intended to
that is used to monitor pore-water pressure. Vibrating wire
represent or replace the standard of care by which the
refers to the mechanism by which pressure on the sensor’s
adequacy of a given professional service must be judged, nor
diaphragm is converted to an electrical signal that is transmit-
should this document be applied without consideration of a
ted to a readout device. A typical vibrating wire piezometer
project’s many unique aspects. The word “standard” in the
reports absolute pressure, rather than gauge pressure. In this
title of this document means only that the document has been
standard, the words “vibrating wire piezometer,” “piezometer,”
approved through the ASTM consensus process.
and “sensor” will be used interchangably.
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Significance and Use
standard.
4.1 Vibrating wire piezometers are typically not recoverable
1.4 This standard does not purport to address all of the
after installation. Replacement, which involves drilling a new
safety concerns, if any, associated with its use. It is the
borehole, is expensive and sometimes impossible. Thus it is
responsibility of the user of this standard to establish appro-
important to be certain that the sensor is operational before it
priate safety and health practices and determine the applica-
is installed.
bility of regulatory limitations prior to use.
4.2 Lackingsophisticatedtestingfacilities,fieldtestersmust
2. Referenced Documents
use equipment that is at hand. But in so doing, field testers
2
should not expect to achieve the same accuracy and precision
2.1 ASTM Standards:
that manufacturers state on the sensor calibration record.
D653 Terminology Relating to Soil, Rock, and Contained
Instead, field testers should look for obvious non-
Fluids
conformances, as explained in the procedures.
D3740 Practice for Minimum Requirements for Agencies
Engaged in Testing and/or Inspection of Soil and Rock as
4.3 This standard practice is not meant to restrict the use of
other appropriate acceptance tests and procedures.
NOTE 1—Notwithstanding the statements on precision and bias con-
1
This practice is under the jurisdiction of ASTM Committee D18 on Soil and
tained in this practice, the precision of this practice is dependent on the
Rock and is the direct responsibility of Subcommittee D18.23 on Field Instrumen-
competence of the personnel performing it and the suitability of the
tation.
equipment and facilities used. Agencies that meet the criteria of Practice
Current edition approved July 1, 2012. Published October 2012. DOI: 10.1520/
D3740 are generally considered capable of competent and objective
D7764-12.
2
testing. Users of this practice are cautioned that compliance with Practice
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
D3740 does not itself ensure reliable testing. Reliable testing depends on
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
many factors; Practice D3740 provides a means of evaluating some of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. these factors.
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D7764 − 12
5. Equipment 7. D
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