Technical Education

DRY GAS SEAL RELIABILITY IN CENTRIFUGAL COMPRESSORS (1)

DESIGN, OPERATION, AND MAINTENANCE CONSIDERATIONS  FOR IMPROVED DRY GAS SEAL RELIABILITY IN CENTRIFUGAL COMPRESSORS

 Abstract

The use of dry gas seals in process gas centrifugal compressors has increased dramatically over the last twenty years, replacing traditional oil film seals in most applications. Read more »

PID Guide (3)

4.3.5 Drivers

4.3.5.1  Show drivers with driven equipment using the symbols for motors, diesel engines and turbines. Equipment numbers for drivers are normally not required since equipment data for the drivers is shown as an integral part of the associated driven component. Read more »

PID Guide (2)

4.         Requirements

Practice requirements are divided into five sections (General, Format, Equipment, Piping and Instruments & Controls). Reference the appropriate section for the specific area of interest. Read more »

THREE TERM (PID) CONTROL (3)

PROPORTIONAL 

Let the error be x (it was E previously) and this is multiplied by the proportional constant k1 to give the output of the processor Qn.  Read more »

THREE TERM (PID) CONTROL (2)

DERIVATIVE CONTROL

Figure 5

Ideally we wish an error to be corrected as quickly as possible with no overshoot. Read more »

THREE TERM (PID) CONTROL (1)

The following is a stand alone tutorial to explain the meaning of P.I.D. or 3 Term control used in analogue and digital control systems. P.I.D. stands for Proportional, Integral and  Derivative. Read more »

PID Guide (1)

1.     Introduction

1.1 Purpose

This Practice provides criteria for the development of Piping and Instrumentation Diagrams (P&IDs). Read more »

Rectifier/Battery Charger

General/input.  Incoming commercial a.c. power is converted to a regulated d.c. output by the rectifier/battery charger. The rectifier battery/charger generally comprises a 6- or 12-pulse fully controlled thyristor bridge with constant voltage/constant current characteristics. Read more »

Underground Cables

 Until the 1970s the type of cable used predominantly for underground power distribution  for  public  supply  in  the  UK  at  voltages  up  to  33 kV  was  the impregnated paper insulated lead-sheathed  cable. The standard constructions and requirements for this type of cable are speci?ed in BS 6480. Read more »

Generator Protection and Synchronization

All generators have some form of electrical protection which is aimed at limiting the damage to the generator from an internal fault or external fault that gives rise to damaging conditions.  Read more »

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