API MPMS 5.4:2005(2015) pdf download

API MPMS 5.4:2005(2015) pdf download.Manual of Petroleum Measurement Standards Chapter 5—Metering Section 4—Accessory Equipment for Liquid Meters.
5.4.6.12 SWIVEL ADAPTER
A swivel adapter is a convenience device (hat allows accessories mounted above the swivel to rotate without changing indication or registration.
5.4.6.13 ANGLE ADAPTER
An angle adapter is a convenience device that allows a counter/printer to be mounted at an angle for beuer accessibility and visibility.
5.4.6.14 DUAL ADAPTER
A dual adapter is used to mount two sets of shaft-driven accessories on a sitigle meter, The device is often used with a temperature compensator on one side so that both compensated and unconipensated meter readings are available.
5.4.6.15 RIGHT-ANGLE TAKEOFF
A right-angle takeoff is a device in the meter’s drive train that is used to provide a rotating external output shall for operating mechanical accessories that are mounted externally to the meter.
5.4.6.16 SHIFTER ADAPTER
A shifter adapter is used for mounting two sets of shaft- driven accessories on a single meter so that only one set of shaft-driven accessories can be driven at a time. The device is generally used in conjunction with tender changes in pipeline operation, where the total quantity of a tender must he retained while registration is in process on the alternate printer or register. The means of shifting, which may be manual or remote. transkrs the meter drive train from one set of accessories to the other. The adapter can be equipped with an optional indicator to show its position.
5.4.6.17 KEY-LOCK COUNTER
A key-lock counter is usually used in conjunction with the unattended operation of a bulk-plant metering system. The equipment provides a readout for any person who has authorized access to the system. Access is gained through keys and locks that connect the appropriate readout to the meter drive train and actuates the system.
5.4.7 Pulse-Driven (Electronic) Accessories
A variety of pulse-driven accessories can be used with liq. uid meters covered in Chapter 5. The pulses generated by high-resolution pulse generators on meters represent discrete units of quantity and can be used 10 provide input signals to the equipment discussed in 5.4.7.1 through 5.4.7.15.
5.4.7.1 ELECTRONIC ADJUSTER (CALIBRATOR OR SCALER)
An electronic adjuster. also called a factoring counter. manipulates the pulse signal to achieve a unit meter factor for direct reading of quantity. The device is generally capable of being calibrated to one part in 10,0(W).
5.4.7.2 READOUT
An clcctrically driven primary readout indicates quantities in the desired standard units of measurement, such as gallons. barrels, or cubic meters: it also indicates decimal fractions of these units. if required. The accuracy of the readout depends On SysICfll resolution, which is proportional to the number of pulses per unit quantity.
Electromechanical registers are limited in speed. Their adequacy should ihereftwe be considered before a decision is made about installation. Electronic readouts are not limited in speed. hut they depend on electrical power for proper performatice. During a power failure, standby power is needed to verify and retain meter registration it’ a mechanical means is not available.
5.4.7.3 PRINTER
Several types of electrical printers are available. The two common ones include electromechanical mechanisms in the final stages. The first type is designed so that each adjacent digit advances the next digit into position as ii would in a mechanical readout. This type of printer is simple, inexpensive, and widely used. but it has limited speed and longevity.
The second type of printer includes individual digit modules that remain in a rest position until they arc called on to print the throughput quantity that is stored in a memory. This type of printer has high resolution, high speed, and exceptional longevity.
5.4.7.4 FLOW COMPUTER
Many types of electronic flow computers are available that accept meter output signals., and other sensor signals. to calculate volume or mass flow quantities as required. Flow computers display, transmit. and print data that can be used for operational or custody transfer purposes. A flow computer can be designed for a single meter run or a hank of meters.