wsdot.wa.gov Procedure For Region Laboratory Equipment : Washington State Department Of Transportation

Name of the Organization : Washington State Department Of Transportation
Type of Facility : Procedures for Region Laboratory Equipment
Location : Washington

Website : http://www.wsdot.wa.gov/
Terms & Conditions : https://www.statusin.org/uploads/26466-Labprocedure.pdf

Region Laboratory Equipment Procedure :

Verification Procedures (VP’s) are in-house written procedures for performing standardization or check of laboratory equipment.

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The procedures are uniquely identified, describe the equipment required to perform, designates the frequency to occur and includes a step-by-step procedure for performing the activity.All Verification Procedures (VP’s) consist of two parts:

Procedure :
The procedure portion covers:
** What test procedure(s) the equipment is used in
** What measurement standard is required to perform the standardization/check
** The required accuracy of the measurement standards

** Whether the procedure is a check or a standardization
** The tolerances for the equipment
** A step by step explanation of how to standardize or check the equipment.

Worksheet :
The Worksheet is used to document the following:
** unique identification of the equipment
** Frequency of standardization/check
** name of the person performing the standardization/check

** Date the equipment was standardized/checked
** Date of the previous standardization/check.
** Date of the next standardization/check, SML or Region.

** Measurement standards used to perform the standardization/check
** Specification and tolerances for the equipment being standardized/checked
** Actual measurement(s) of the equipment

** Whether the equipment is satisfactory or unsatisfactory for use
** Whether the equipment requires a correction factor to be applied.
** What steps were taken (replace, repair, dispose, removed from service, apply correction, none).
** Additional comments

Check Procedure : VP-1 (Sieves)
Equipment Verified : SIEVES
Standard References : AASHTO M 92
Purpose :
This method provides instructions for checking the physical condition of laboratory test sieves ranging in size from 75mm (3 inches) to 0.075mm (No. 200).Standard Equipment Required:
1. An eyepiece with a scale readable to 0.1mm (for use when checking sieves finer than No. 4).
2. A caliper readable to 0.01mm

3. A set of gauge blocks with one side equal to ½ the sieve opening and the other side stepped having a minimum dimension equal to the minimum specified opening, and a maximum dimension equal to the maximum specified size of the opening as stated in the applicable tolerances from AASHTO M-92. As a minimum, the gauge block shall have the following sizes 1-1/2”, 1- 1/4”, 1”, 3/4”, 5/8”, 1/2”, 3/8”, #4.

Tolerance :
Sieves shall meet the physical requirements specified in AASHTO M – 92 (ASTM E -11).

Procedure :
General inspection of all sizes of sieves
1.Check the frame and solder joints for cracks or holes (check for pin holes in the finer sieves).
2.Make sure the sieve has an appropriate label, i.e. the ID # and sieve size.
3.Check the sieve mesh for excessive bowing by pressing the mesh from either side, it should not flex the more than 1/8”.
4.Mark sieves acceptable by placing a signed and dated sticker on the frame of the sieve.
5.Discard unacceptable sieves