ASTM D3305-94(1999)e1
(Practice)Standard Practice for Sampling Small Gas Volume in a Transformer
Standard Practice for Sampling Small Gas Volume in a Transformer
SCOPE
1.1 This practice is used for sampling gas from a transformer gas space or from a gas-collector relay where the volume of gas available is small and will not permit the use of Practice D2759.
1.2 This practice covers sampling, using a gas-tight syringe as the sampling apparatus and container.
1.3 If the apparatus to be sampled is found to be under a negative pressure, the apparatus pressure should be raised by the addition of nitrogen gas until a positive pressure is obtained.
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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e1
Designation:D 3305–94 (Reapproved 1999)
Standard Practice for
Sampling Small Gas Volume in a Transformer
This standard is issued under the fixed designation D 3305; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Editorial changes were made in March 1999.
1. Scope On transformers with gas-collector relays, gas in the form of
bubbles may collect in a gas-collector relay and provide a
1.1 This practice is used for sampling gas from a trans-
means to obtain a gas sample for analysis.
former gas space or from a gas-collector relay where the
3.4 Do not draw samples from an energized instrument
volume of gas available is small and will not permit the use of
transformer.
Practice D 2759.
1.2 This practice covers sampling, using a gas-tight syringe
4. Apparatus
as the sampling apparatus and container.
4.1 Syringe, gastight, 5-mL, with luer loc termination.
1.3 If the apparatus to be sampled is found to be under a
4.2 Stopcock, three-way, plastic.
negative pressure, the apparatus pressure should be raised by
4.3 Length of PTFE Tubing, ⁄8 in. inside diameter.
the addition of nitrogen gas until a positive pressure is
obtained.
5. Procedure
1.4 This standard does not purport to address all of the
5.1 Connect the plastic stopcock to the plastic tubing.
safety concerns, if any, associated with its use. It is the
Connect the other end of tubing to a suitable valved entrance to
responsibility of the user of this standard to establish appro-
the transformer gas space or gas-collector relay.
priate safety and health practices and determine the applica-
5.2 Open the valve and stopcock so gas space gas can flush
bility of regulatory limitations prior to use.
air from valve, tubing and stopcock. (The stopcock handle
points to the closed port, leaving the other two ports in open
2. Referenced Documents
communication.)
2.1 ASTM Standards:
5.3 Connect syringe to the stopcock.
D 2759 Practice for Sampling Gas from a Transformer
2 5.4 Turn the stopcock handle to allow gas from the gas
Under Positive Pressure
space to enter the syringe, taking care that gas pressure does
3. Significance and Use not eject the plunger
...
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FIG. 1 Bored Forgings
Note 1: Sensitivity multiplication factor such that a 10 % indication at the forging bore surface will be equivalent to a 1/8 in. [3 mm] diameter flat bottom hole. Inspection frequency: 2.0 MHz or 2.25 MHz. Material velocity: 2.30 in./s × 105 in./s [5.85 cm/s × 105 cm/s].
FIG. 2 Solid Forgings
Note 1: Sensitivity multiplication factor such that a 10 % indication at the forging centerline surface will be equivalent to a 1/8 in. [3 mm] diameter flat bottom hole. Inspection frequency: 2.0 MHz or 2.25 MHz. Material velocity: 2.30 in./s × 105 in./s [5.85 cm/s × 105 cm/s].
FIG. 3 Conversion Factors to Be Used in Conjunction with Fig. 1 and Fig. 2 if a Change in the Reference Reflector Diameter is Required
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