Transcript HYDROSTATIC TESTING - Electric Boat Corporation

HYDROSTATIC TESTING
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Approved for Public Release
Hydrostatic Testing
• Testing requirements may be specified
in drawings, specifications, or standard
clauses (76 series)
• Generally procedures are required
– must be clear, concise, and
sufficiently descriptive to perform the
test
– may require approval of the test
procedure (VPAR)
Hydrostatic Testing
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Hydrostatic Test Setup & System
• Use of Test Gauges
– Must be in the calibration system and properly
calibrated
– Must be of a proper range for its intended use
• Anticipated test pressure reading must be
approximately 1/2 to 2/3 of the total gauge range.
• Good practice is gauge increments must be no
greater than the total tolerance allowance.
Hydrostatic Testing
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Hydrostatic Test Setup & System
Cleanliness of the Test System and Fluid
– Contamination within the test setup may
• influence the outcome of the test,
• damage component being tested, or
• damage test setup equipment
• Example = dirt on a valve seat
Cleanliness of the Tested Product
– Requirement may invoke specific cleanliness for the
test setup and fluid
– Requirement may have specific flushing instructions
for the product prior to and following the test
Hydrostatic Testing
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Test Setup Must be Designed for
Safety and Functionality
• Relief valves must be incorporated into the
test system to prevent over pressurization
– Protect against personnel injury
– Prevent damage to test hardware
– Prevent damage to component being tested
Hydrostatic Testing
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Test Pressure, Temperature and
Dwell Time
• Allow time for the system to stabilize at
ambient temperature before conducting
the test.
• Pressure, temperature, and dwell time
must have tolerance limits - if not
available, request limits using a Vendor
Information Request (VIR).
– Tolerance per industry standard is not
acceptable
Hydrostatic Testing
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Hydrostatic Test Setup & System
• Pressurize the system and isolate the test product
from balance of the test setup
• Observe the test product for results as required in
the appropriate procedure and document the results
– Obtain Electric Boat witness if required (SC37-8)
– Inspect for leakage through the product
– Document the actual time, temperature, and
pressure test parameters
Hydrostatic Testing
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Condition of the Component
After Testing
•Properly cleaned
•Preservatives, if required
•Sealed, if required
•Proper orientation during handling and
storage to prevent damage
• (example = position of ball or gate within a valve may be
important, especially for long term storage)
Hydrostatic Testing
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Test Report Must Contain:
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Name of Testing Organization
Date of the test
EB Purchase Order and Item Number
Applicable Component Specification, Drawing, etc. and
Revision
Test Procedure and Revision (VPAR# if applicable)
Identification of testing equipment
Serial number of gauging used
Traceability of component (Serial/Heat/Lot Code Number)
Hydrostatic Testing
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Test Report Must Contain: (continued)
• Actual test parameters (pressure, temperature,
dwell time, etc.) and the acceptance criteria
• Statement of results (Accept or Reject)
• Document nonconformance should failure occur
– Component(s) affected
– Amount and rate of leakage if recordable,
• Signature of test organization representative and
date as required by the specification
Hydrostatic Testing
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Approved for Public Release