API MPMS 4.7 2009 pdf free download

API MPMS 4.7 2009 pdf free download.Chapter 4—Proving Systems Section 7—Field Standard Test Measures.
4.8 Handling A field standard test measure is a precision instrument and shall be handled with great care to avoid damage that may alter its volume. Any test measure that is normally transported to various locations should be protected. A case, shipping container, or other means that sufficiently protects the test measure against dents and/or scale damage during storage or transportation should be used. Test measures mounted and moved on trailers should be secured to prevent movement or damage during travel. 5 Inspection and Cleaning 5.1 General All test measures shall be inspected and cleaned prior to calibration. Inspections or examinations are required for new test measures and prior to each calibration. 5.2 Visual Inspection A visual inspection of any field standard test measure shall be made before each calibration to ascertain that the capacity has not been altered by dents, internal corrosion or surface deposits. In addition, the test measure shall be inspected carefully to make sure it is free of rust, broken seals, broken gauge glasses or scales, leaks, or defective drain valves. Interior joints and seams shall be smooth and uniform. Surfaces, including joints and seams, shall be clean and free from grease, dirt, or oil film. Surfaces shall be smooth and free from rust corrosion. Potential air or water traps, resulting from either design or damage, are not permitted.
The interior of test measures should never be exposed to salt water or other type of water with a high concentration of dissolved solids. Isolated use of contaminated water in a test measure may cause corrosive damage, pitting, and/or deposits to adhere to the interior surfaces. Noninvertible test measures shall be equipped with a fixed anti-swirl plate to eliminate the formation of a vortex during draining. The neck on a test measure shall be uniformly cylindrical throughout the length of the neck. The top surface of the neck of a test measure shall be ground, machined, or smoothly formed. The scale shall be of corrosion-resistant metal, firm, secure, and easily adjustable. A provision shall exist for affixing a stainless wire seal to provide a means for detecting unauthorized adjustment. The scale divisions or graduations shall be linear. The scale length shall be appropriate to the test measure. Applicable volume units (cubic inches, milliliters, gallons, liters, or others) shall be clearly indicated, and scale markings shall be legible. The gauge glass shall be clean and clear after wetting (that is, no droplets should be present), and it shall be capable of being removed, cleaned, and replaced. 5.3 Cleaning Procedures Prior to any cleaning of a test measure, it should be examined for any signs of damage as described in the inspection section. Normal cleaning of the interior of the test measure involves scrubbing with a biodegradable detergent and water. However, if the interior of the test measure contains oil residue then it may be necessary to use solvents for cleaning prior to cleaning with detergents. In the event a test measure is heavily contaminated with oil residues, the additional step of steam cleaning the interior of the test measure prior to any solvent cleaning or detergent washing may be required. Once the test measure has been cleaned, it should be rinsed and allowed to dry. 6 Calibration 6.1 General The National Institute of Standards and Technology (NIST) is the calibrating agency of choice in the United States for field standard test measures used to calibrate meter provers. Calibrations shall be in accordance with NIST SP 250-72, using pure water (distilled, de-ionized or reverse osmosis source with a maximum conductivity of 2 µS) as the calibrating liquid. This standard dictates reference water shall be used as the calibrating liquid because of its stability, low thermal coefficient of expansion, and high heat capacity. The actual delivered volume of the test measure shall be used as the official capacity used to calibrate provers.