a person who proves or demonstrates something. 2. an apparatus used for testing.
A dough proofer is a warming chamber used in baking that encourages fermentation of dough by yeast through warm temperatures and controlled humidity. It is also called a proofing box, proofing oven or proofing cabinet. A dough retarder is a refrigerator used to control the fermentation of yeast when proofing dough.
A pipe prover provides in situ proving of a meter on the actual product at the operating temperature and pressure. Pipe prover measuring principle is based on the repeatable displacement of a known volume of liquid in a calibrated section of pipe between two signalling detectors.
A tank prover is an open or closed volumetric measure that may have a graduated top neck or graduated bottom neck. Construction of a tank prover needs to be study enough so when it is full of liquid the steel will not lose its shape.
The prover consists of a flow tube that houses a free floating piston with a coaxially mounted poppet valve. During the proving cycle, the poppet valve closes and the flowing stream displaces the piston over the calibrated volume.
[′mēd·?r ‚fak·t?r] (engineering) A factor used with a meter to correct for ambient conditions, for example, the factor for a fluid-flow meter to compensate for such conditions as liquid temperature change and pressure shrinkage.
Lease automatic custody transfer (LACT) is a unit that facilitates definite measuring of petroleum products from one custody of legal commodity to another. It is the best way to sell crude oil on lease. The entire system includes sampling, automatic measurement and transfer of oil into a pipeline from a lease location.
The Stationary Small Volume Prover is a precise instrument that receives a command from the flow computer to initiate the retraction of the displacement piston and start the meter proving process.
From Wikipedia, the free encyclopedia. For aircraft fuel flow meters, K-factor refers to the number of pulses expected for every one volumetric unit of fluid passing through a given flow meter, and is usually encountered when dealing with pulse signals.
Meter proving is a method of physically testing the accuracy of a meter through the proving process of measuring temperature, pressure, flow rate, and density against a known prover. A PD meter (Positive Displacement meter) requires fluid to mechanically displace components in the meter in order to measure flow.
The meter factor is obtained by dividing the prover test volume by the indicated volume of the meter. Once the meter factor is determined it is used as a volume correction in the calculation for net standard volume of a receipt or delivery of liquids.
The meter base K-factor is the coarse calibration factor used with the flow computer, which is typically supplied by the meter manufacturer. The proving K-factor (PKF) is used to calculate the correct meter factor based on the pulses it receives while a known amount of liquid passes through the SVP.
Double chronometry.A pulse interpolation method used in small volume provers to provide for fractional meter pulse counting. (NIST HB 105-7) Generally, double chronometry uses a component that increments time very precisely and operates two counters. Counter one is started when the first detector switch is tripped.
When sizing a Coriolis meter for proving applications, ensure the following: 1) The flow range over which the meter will operate and be proved, does not exceed a flowing velocity of 60 ft/sec through the meter. 2) The optimum flow signal stability for proving is obtained with flow velocities of 3 to 60 ft/sec.
In a standard unit, a LACT unit pump sends oil from a storage tank into the unit. It's sent through an air eliminator, which removes any gasses trapped in the stream. A BS&W monitor (basic sediment and water) collects representative samples.
Sphere ProverDisplacement of the volume of liquid is achieved by an oversized sphere/ball traveling through the pipe. The bidirectional prover allows the ball to travel first in one direction and then in the other by reversing the flow through the displacement prover. This is done with a four way valve (4-way valve).
Liquid meter proving serves two purposes: 1.) to determine if the meter performance has been affected by mechanical failure and. 2.) to obtain a meter factor. A mechanical failure can occur in the measuring element, level control, pressure controls, cut monitor or control valves.
