ASTM E3373-24

Standard Test Method for Scour of Hydrodynamic Separators and Settling Devices

SIGNIFICANCE AND USE
5.1 This test method provides test results for evaluating the potential for scour of sediment captured within a MTD in online and offline configurations.  
5.2 This test method will determine if an MTD can meet the scour performance requirements prescribed by an associated verification protocol or local AHJ requirements.
SCOPE
1.1 This test method covers the testing of hydrodynamic stormwater separators and underground settling devices as it relates to the measurement of the resuspension and washout (scour) of previously captured sediment.  
1.2 Units tested shall be of a size commonly manufactured and available for purchase. In order to facilitate testing it is permissible to substitute alternate materials for the housing and structural components of the test units if operational components are at full size, with identical dimensions, configurations and materials specified for commercial use. Scale models are not permissible.  
1.3 The test method provides a means of evaluating retention of suspended solids previously captured with a manufactured treatment device (MTD) that is placed as an offline or online treatment device along storm drain pipe lines. It provides criteria in which to evaluate whether the MTD is appropriate for installation in offline or online conditions.  
1.4 This test method provides the means for evaluating the scour potential for both offline and online conditions.  
1.5 Units—The values stated in inch-pound units are to be regarded as standard, except for methods to establish and report sediment concentration and particle size. It is convention to exclusively describe sediment concentration in mg/L and particle size in mm or μm, both of which are SI units. The SI units given in parentheses are mathematical conversions, which are provided for information purposes only and are not considered standard. Reporting of test results in units other than inch-pound units shall not be regarded as non-conformance with this test method.  
1.6 This test method may be subject to specific requirements set by a Quality Assurance Project Plan, a specific verification protocol, or Authority Having Jurisdiction (AHJ). It is advised to review one or all of the above to ensure compliance  
1.7 Acceptance of test results attained according to this specification may be subject to specific requirements set by a Quality Assurance Project Plan, a specific verification protocol, or Authority Having Jurisdiction (AHJ). It is advised to review one or all of the above to ensure compliance.  
1.8 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Dec-2023
• ICS: 13.060.10 - Water of natural resources
• Technical Committee: E64 - Stormwater Control Measures
• Drafting Committee: E64.01 - Lab Evaluation

Relations

• Replaces: ASTM E3373-23 - Standard Test Method for Scour of Hydrodynamic Separators and Settling Devices
• Effective Date: 01-Jan-2024
• Refers: ASTM D5241-92(2024) - Standard Practice for Micro-Extraction of Water for Analysis of Volatile and Semi-Volatile Organic Compounds in Water
• Effective Date: 01-Apr-2024
• Refers: ASTM D4959-24 - Standard Test Method for Determination of Water Content of Soil By Direct Heating
• Effective Date: 01-Feb-2024
• Refers: ASTM C1745/C1745M-24 - Standard Test Method for Measurement of Hydraulic Characteristics of Hydrodynamic Stormwater Separators and Underground Settling Devices
• Effective Date: 01-Jan-2024
• Refers: ASTM E3318-24 - Standard Terminology for Standards Relating to Stormwater Control Measures
• Effective Date: 01-Jan-2024
• Refers: ASTM C1745/C1745M-18 - Standard Test Method for Measurement of Hydraulic Characteristics of Hydrodynamic Stormwater Separators and Underground Settling Devices
• Effective Date: 01-May-2018
• Refers: ASTM D5241-92(2017) - Standard Practice for Micro-Extraction of Water for Analysis of Volatile and Semi-Volatile Organic Compounds in Water
• Effective Date: 15-Dec-2017
• Refers: ASTM D4959-16 - Standard Test Method for Determination of Water Content of Soil By Direct Heating
• Effective Date: 01-Jan-2016
• Referred By: ASTM C1893-23 - Standard Practice for Laboratory Performance Verification of Hydrodynamic Separators for the Treatment of Stormwater Runoff
• Effective Date: 01-Jan-2024

Overview

ASTM E3373-24 is the Standard Test Method for Scour of Hydrodynamic Separators and Settling Devices, published by ASTM International. This standard outlines procedures to evaluate the potential for resuspension and washout (scour) of sediment previously captured in hydrodynamic stormwater separators and underground settling devices. The test method applies to full-scale manufactured treatment devices (MTDs) typically installed in stormwater drainage systems, allowing for performance assessment in both online and offline configurations. The results help determine if a device meets relevant scour performance requirements set by protocols or authorities having jurisdiction (AHJs).

Key Topics

• Test Method Scope
  The standard covers:

  • Evaluation of sediment retention and scour in MTDs
  • Testing protocols for both online and offline MTD configurations
  • Use of full-scale devices with operational components matching commercial units

• Sampling and Measurement
  Key points include:

  • Preloading sediment to 50% of the device’s recommended maximum storage volume
  • Background sediment concentration control and adjustment
  • Collection and analysis of influent and effluent samples for suspended solids concentration (SSC)
  • Detailed requirements for apparatus setup, including water supply, piping, flow metering, and sample collection

• Reporting Requirements
  Test results must document:

  • Setup diagrams and device specifications
  • Sediment and water characteristics (particle size, concentrations, temperatures)
  • Flow rates, sampling times, and detailed sample data
  • Explanations for any data exclusion

• Compliance & Precision

  • The method accommodates specific requirements from project plans, verification protocols, or AHJs
  • Results report in both inch-pound and SI units (mg/L for concentration, mm/μm for particle size)
  • All applicable health, safety, and environmental practices must be observed

Applications

This standard delivers significant practical value for:

• Stormwater Treatment System Design and Verification
  Engineers and manufacturers use ASTM E3373-24 to verify the performance of hydrodynamic separators and settling devices under realistic conditions, ensuring they retain sediments without excessive scour during high-flow events.

• Regulatory Compliance
  Authorities use this standard to assess if installed or proposed MTDs meet local or regional stormwater management requirements. The documented performance data support approval and ongoing compliance.

• Product Development and Quality Assurance
  Manufacturers employ this test method in product R&D and quality assurance programs. Accurate assessment of scour potential enhances device reliability and market acceptance.

• Infrastructure Maintenance Planning
  Facility managers and contractors use scour performance data to plan maintenance schedules, anticipate cleaning intervals, and maintain optimal operation of stormwater control measures.

Related Standards

To ensure comprehensive evaluation and compliance, ASTM E3373-24 references and aligns with other ASTM standards, including:

• ASTM C1745/C1745M: Measurement of hydraulic characteristics of stormwater separators and settling devices
• ASTM C1746/C1746M: Test methods for suspended sediment removal efficiency
• ASTM D3977: Methods for determining sediment concentration in water samples
• ASTM D6913/D6913M and D7928: Particle-size distribution analyses
• ASTM E3317: Specification for silica-based sediments for stormwater device evaluation
• ASTM E3318: Terminology related to stormwater control measures

Keywords: hydrodynamic separators, stormwater control measure, manufactured treatment device, scour, settling devices, resuspension, water quality, online/offline configuration, sediment retention, regulatory compliance

By following ASTME3373-24, stakeholders ensure that hydrodynamic separators and settling devices deliver effective stormwater management, comply with performance requirements, and support sustainable infrastructure practices.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E3373 − 24
Standard Test Method for
Scour of Hydrodynamic Separators and Settling Devices
This standard is issued under the fixed designation E3373; 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 1.7 Acceptance of test results attained according to this
specification may be subject to specific requirements set by a
1.1 This test method covers the testing of hydrodynamic
Quality Assurance Project Plan, a specific verification protocol,
stormwater separators and underground settling devices as it
or Authority Having Jurisdiction (AHJ). It is advised to review
relates to the measurement of the resuspension and washout
one or all of the above to ensure compliance.
(scour) of previously captured sediment.
1.8 This standard does not purport to address all of the
1.2 Units tested shall be of a size commonly manufactured
safety concerns, if any, associated with its use. It is the
and available for purchase. In order to facilitate testing it is
responsibility of the user of this standard to establish appro-
permissible to substitute alternate materials for the housing and
priate safety, health, and environmental practices and deter-
structural components of the test units if operational compo-
mine the applicability of regulatory limitations prior to use.
nents are at full size, with identical dimensions, configurations
1.9 This international standard was developed in accor-
and materials specified for commercial use. Scale models are
dance with internationally recognized principles on standard-
not permissible.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.3 The test method provides a means of evaluating reten-
mendations issued by the World Trade Organization Technical
tion of suspended solids previously captured with a manufac-
Barriers to Trade (TBT) Committee.
tured treatment device (MTD) that is placed as an offline or
online treatment device along storm drain pipe lines. It
2. Referenced Documents
provides criteria in which to evaluate whether the MTD is
2.1 ASTM Standards:
appropriate for installation in offline or online conditions.
C1745/C1745M Test Method for Measurement of Hydraulic
1.4 This test method provides the means for evaluating the
Characteristics of Hydrodynamic Stormwater Separators
scour potential for both offline and online conditions.
and Underground Settling Devices
C1746/C1746M Test Method for Measurement of Sus-
1.5 Units—The values stated in inch-pound units are to be
pended Sediment Removal Efficiency of Hydrodynamic
regarded as standard, except for methods to establish and
Stormwater Separators and Underground Settling Devices
report sediment concentration and particle size. It is convention
D2216 Test Methods for Laboratory Determination of Water
to exclusively describe sediment concentration in mg/L and
(Moisture) Content of Soil and Rock by Mass
particle size in mm or μm, both of which are SI units. The SI
D3977 Test Methods for Determining Sediment Concentra-
units given in parentheses are mathematical conversions,
tion in Water Samples
which are provided for information purposes only and are not
D4959 Test Method for Determination of Water Content of
considered standard. Reporting of test results in units other
Soil By Direct Heating
than inch-pound units shall not be regarded as non-
D5241 Practice for Micro-Extraction of Water for Analysis
conformance with this test method.
of Volatile and Semi-Volatile Organic Compounds in
1.6 This test method may be subject to specific requirements
Water
set by a Quality Assurance Project Plan, a specific verification
D6889 Practice for Fast Screening for Volatile Organic
protocol, or Authority Having Jurisdiction (AHJ). It is advised
Compounds in Water Using Solid Phase Microextraction
to review one or all of the above to ensure compliance
(SPME)
D6913/D6913M Test Methods for Particle-Size Distribution
(Gradation) of Soils Using Sieve Analysis
This test method is under the jurisdiction of ASTM Committee E64 on
Stormwater Control Measures and is the direct responsibility of Subcommittee
E64.01 on Lab Evaluation. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Jan. 1, 2024. Published January 2024. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2023. Last previous edition approved in 2023 as E3373 – 23. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/E3373-24. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E3373 − 24
D7928 Test Method for Particle-Size Distribution (Grada- length is to be from 3 to 5 feet (0.91-1.5 m) long with a free-fall
tion) of Fine-Grained Soils Using the Sedimentation condition at its end. No fittings are allowed with the exception
(Hydrometer) Analysis of:
E3317 Specification for Silica-Based Sediments for the (1) Sediment injection port
Evaluation of Stormwater Treatment Devices (2) Water sampling port(s)
E3318 Terminology for Standards Relating to Stormwater (3) Fittings connecting the influent pipe and effluent pipe to
Control Measures the test unit
(4) Pressure transducer taps and temperature sensors
3. Terminology
6.1.2.3 Pipe slopes for the influent and effluent pipes shall
be 1-2 %.
3.1 Definitions:
6.1.2.4 Both influent and effluent pipes shall have smooth
3.1.1 For definitions of common technical terms used in this
interior walls with an accepted manning’s n value of <0.02 or
standard, refer to Terminology E3318.
a roughness of <5mm.
6.1.3 Background Sampling Port:
4. Summary of Test Method
6.1.3.1 The background sampling port shall be at a fixed,
4.1 This test method describes procedures and equipment
pre-determined location on the influent pipe upstream from the
required to measure the susceptibility to scouring and re-
MTD.
suspension of settled sediments in hydrodynamic separators
6.1.3.2 The background sampling port shall be placed at the
and underground settling devices used for treating stormwater
invert, and along the centerline, of the influent pipe.
runoff.
6.1.3.3 The background sampling port shall utilize a tee
with a maximum diameter of 2 in. (50 mm) and a ball valve.
5. Significance and Use
6.1.3.4 The background sampling port shall not extend
5.1 This test method provides test results for evaluating the
higher than the invert of the influent pipe.
potential for scour of sediment captured within a MTD in
6.2 Flow Measurements:
online and offline configurations.
6.2.1 A flow meter of sufficient accuracy, precision, and
5.2 This test method will determine if an MTD can meet the
stability to meet the requirements of this standard must be
scour performance requirements prescribed by an associated
located upstream of the tested unit at a location in or on the
verification protocol or local AHJ requirements.
influent pipe where full pipe flow is attained to accurately
measure the flow through the unit tested.
6. Apparatus and Setup
6.2.2 All flow meters must be located a sufficient distance
6.1 The experimental setup includes a water supply, piping, away from any velocity or turbulence increasing devices
(valves, pumps, elbows, flanges, etc.) and mounted as required
fittings, background sampling port, sediment delivery system,
by the instrument manufacturer.
flow meter, temperature instrumentation, scales/balances and
6.2.3 All flow meters shall have a valid certificate of
sample containers. Set up may also include a false floor.
6.1.1 Water Supply: calibration or verification in force at the time of testing. A copy
of the certificate or validation shall be included in the final
6.1.1.1 Water upstream of the sediment delivery system
shall be “clear.” Clear water is defined as having a background report.
SSC no more than 20 mg ⁄L. 6.2.4 The flow meter data logger must record flows at a
6.1.1.2 “Recirculated” water that passes through the test minimum of once per minute so that effluent sediment concen-
unit shall not be redirected into the test unit until it has been tration samples can be matched to specific flow rate values. The
filtered such that it is indistinguishable from “clear” water. If flow meter data logger must record flows to the nearest 1 gpm
background SSC of the recirculated water is below 20 mg ⁄L
(0.063 L/s). The average flow rate shall be reported. The
filtration is not required Coefficient of Variation (COV) shall be ≤0.03.
6.1.1.3 The use of flocculants, surfactants, etc. is not an
6.2.5 During testing, the allowable variation shall be 610 %
acceptable means to reduce background SSC levels.
of the target flow rate.
6.1.1.4 If a non-potable water source is used, VOC testing in
6.3 All components of the experimental setup shall be
accordance with Practice D5241 or Practice D6889 shall be
inspected immediately before any testing to confirm that no
conducted and the values shall be reported.
damage or obstruction is present and that there are no sedi-
6.1.2 Piping:
ments or other deleterious materials therein.
6.1.2.1 The test unit shall be set up to reflect actual field
installation parameters to the greatest degree possible. Influent
7. Sampling and Sample Testing
and effluent pipe shall be the same diameter and shall be equal
7.1 Background Sampling:
to or less than 25 % of the test unit inside diameter or inside
width of the unit, being the smallest measured dimension. 7.1.1 A minimum of eight (8) Background SSC samples
must be obtained at a pre-determined location upst
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E3373 − 23 E3373 − 24
Standard Test Method for
Scour of Hydrodynamic Separators and Settling Devices
This standard is issued under the fixed designation E3373; 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
1.1 This test method covers the testing of hydrodynamic stormwater separators and underground settling devices as it relates to
the measurement of the resuspension and washout (scour) of previously captured sediment.
1.2 Units tested shall be of a size commonly manufactured and available for purchase. In order to facilitate testing it is permissible
to substitute alternate materials for the housing and structural components of the test units if operational components are at full
size, with identical dimensions, configurations and materials specified for commercial use. Scale models are not permissible.
1.3 The test method provides a means of evaluating retention of suspended solids previously captured in with a manufactured
treatment device (MTD) that is placed as an offline or online treatment device along storm drain pipe lines. It provides criteria in
which to evaluate whether the MTD is appropriate for installation in offline or online conditions.
1.4 This test method provides the means for evaluating the scour potential for both offline and online conditions.
1.5 Units—The values stated in inch-pound units are to be regarded as standard, except for methods to establish and report
sediment concentration and particle size. It is convention to exclusively describe sediment concentration in mg/L and particle size
in mm or μm, both of which are SI units. The SI units given in parentheses are mathematical conversions, which are provided for
information purposes only and are not considered standard. Reporting of test results in units other than inch-pound units shall not
be regarded as non-conformance with this test method.
1.6 This test method may be subject to specific requirements set by a Quality Assurance Project Plan, a specific verification
protocol, or Authority Having Jurisdiction (AHJ). It is advised to review one or all of the above to ensure compliance
1.7 Acceptance of test results attained according to this specification may be subject to specific requirements set by a Quality
Assurance Project Plan, a specific verification protocol, or Authority Having Jurisdiction (AHJ). It is advised to review one or all
of the above to ensure compliance.
1.8 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.9 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
This test method is under the jurisdiction of ASTM Committee E64 on Stormwater Control Measures and is the direct responsibility of Subcommittee E64.01 on Lab
Evaluation.
Current edition approved March 15, 2023Jan. 1, 2024. Published March 2023January 2024. Originally approved in 2023. Last previous edition approved in 2023 as
E3373 – 23. DOI: 10.1520/E3373-23.10.1520/E3373-24.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E3373 − 24
2. Referenced Documents
2.1 ASTM Standards:
C1745/C1745M Test Method for Measurement of Hydraulic Characteristics of Hydrodynamic Stormwater Separators and
Underground Settling Devices
C1746/C1746M Test Method for Measurement of Suspended Sediment Removal Efficiency of Hydrodynamic Stormwater
Separators and Underground Settling Devices
D2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
D3977 Test Methods for Determining Sediment Concentration in Water Samples
D4959 Test Method for Determination of Water Content of Soil By Direct Heating
D5241 Practice for Micro-Extraction of Water for Analysis of Volatile and Semi-Volatile Organic Compounds in Water
D6889 Practice for Fast Screening for Volatile Organic Compounds in Water Using Solid Phase Microextraction (SPME)
D6913/D6913M Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis
D7928 Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer)
Analysis
E3317 Specification for Silica-Based Sediments for the Evaluation of Stormwater Treatment Devices
E3318 Terminology for Standards Relating to Stormwater Control Measures
3. Terminology
3.1 Definitions:
3.1.1 For definitions of common technical terms used in this standard, refer to Terminology E3318.
4. Summary of Test Method
4.1 This test method describes procedures and equipment required to measure the susceptibility to scouring and re-suspension of
settled sediments in hydrodynamic separators and underground settling devices used for treating stormwater runoff.
5. Significance and Use
5.1 This test method provides test results for evaluating the potential for scour of sediment captured within a MTD in online and
offline configurations.
5.2 This test method will determine if an MTD can meet the scour performance requirements prescribed by an associated
verification protocol or local AHJ requirements.
6. Apparatus and Setup
6.1 The experimental setup includes a water supply, piping, fittings, background sampling port, sediment delivery system, flow
meter, temperature instrumentation, scales/balances and sample containers. Set up may also include a false floor.
6.1.1 Water Supply:
6.1.1.1 Water upstream of the sediment delivery system shall be “clear.” Clear water is defined as having a background SSC no
more than 20 mg ⁄L.
6.1.1.2 “Recirculated” water that passes through the test unit shall not be redirected into the test unit until it has been filtered such
that it is indistinguishable from “clear” water. If background SSC of the recirculated water is below 20 mg ⁄L filtration is not
required
6.1.1.3 The use of flocculants, surfactants, etc. is not an acceptable means to reduce background SSC levels.
6.1.1.4 If a non-potable water source is used, VOC testing in accordance with Practice D5241 or Practice D6889 shall be
conducted and the values shall be reported.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
E3373 − 24
6.1.2 Piping:
6.1.2.1 The test unit shall be set up to reflect actual field installation parameters to the greatest degree possible. Influent and
effluent pipe shall be the same diameter and shall be equal to or less than 25 % of the test unit inside diameter or inside width of
the unit, being the smallest measured dimension.
6.1.2.2 The experimental setup includes an influent straight pipe (without bends) of minimum length equivalent to five pipe
diameters or 20 ft (6.10 m), whichever is less, to ensure stable flow conditions upstream from the test unit. The effluent pipe length
is to be from 3 to 5 feet (0.91-1.5 m) long with a free-fall condition at its end. No fittings are allowed with the exception of:
(1) Sediment injection port
(2) Water sampling port(s)
(3) Fittings connecting the influent pipe and effluent pipe to the test unit
(4) Pressure transducer taps and temperature sensors
6.1.2.3 Pipe slopes for the influent and effluent pipes shall be 1-2 %.
6.1.2.4 Both influent and effluent pipes shall have smooth interior walls with an accepted manning’s n value of <0.02 or a
roughness of <5mm.
6.1.3 Background Sampling Port:
6.1.3.1 The background sampling port shall be at a fixed, pre-determined location on the influent pipe upstream from the MTD.
6.1.3.2 The background sampling port shall be placed at the invert, and along the centerline, of the influent pipe.
6.1.3.3 The background sampling port shall utilize a tee with a maximum diameter of 2 in. (50 mm) and a ball valve.
6.1.3.4 The background sampling port shall not extend higher than the invert of the influent pipe.
6.2 Flow Measurements:
6.2.1 A flow meter of sufficient accuracy, precision, and stability to meet the requirements of this standard must be located
upstream of the tested unit at a location in or on the influent pipe where full pipe flow is attained to accurately measure the flow
through the unit tested.
6.2.2 All flow meters must be located a sufficient distance away from any velocity or turbulence increasing devices (valves,
pumps, elbows, flanges, etc.) and mounted as required by the instrument manufacturer.
6.2.3 All flow meters shall have a valid certificate of calibration or verification in force at the time of testing. A copy of the
certificate or validation shall be included in the final report.
6.2.4 The flow meter data logger must record flows at a minimum of once per minute so that effluent sediment concentration
samples can be matched to specific flow rate values. The flow meter data logger must record flows to the nearest 1 gpm (0.063
L/s). The average flow rate shall be reported. The Coefficient of Variation (COV) shall be ≤0.03.
6.2.5 During testing, the allowable variation shall be 610 % of the target flow rate.
6.3 All components of the experimental setup shall be inspected immediately befor
...