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KKS Power Plant Classification System: Wikis


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The KKS Power Plant Classification System is a standardised system for the classification of power stations. It serves during engineering, construction, operation and maintenance of power stations for identification and classification of the equipment. The system is known in short as KKS which is the abbreviation of the German term Kraftwerk-Kennzeichensystem. KKS will be replaced in future by Reference Designation System for Power Plants, RDS-PP. RDS-PP has almost same structure as KKS - 90 % of the code letters in the function key, other keys much less.


Structure and Format

The KKS has three different types of codes:

  • Process-related code, for identification of systems and equipment according to their functions in the power station process.
  • Point of installation code, for identification of points of installation of electrical ,control and instrumentation devices
  • Location code, for identification of locations of equipment and structures.
Breakdown level   0 1   2 3
Data character  
F0 F1 F2 F3 FN1 FN2   A1 A2 AN1 AN2 AN3 A3 B1 B2 BN1 BN2
Process-related identification
Total plant System code   Equipment unit code Component code
Data type * = (A or N) (N) A A A N N   A A N N N (A) A A N N
Point of installation identification
Total plant Installation unit code · Installation space code  
Data type * + (A or N) (N) A A A N N · A (A) (N) (N) N (A)  
Location identification
Total plant Structure code   Room code  
Data type * + (A or N) (N) A A A N N   (A) (A) (N) N N (A)  

*) Data types are Alpha and Numeric. Alpha contains only capital letters excluding I and O, and also some special characters. If type is in parentheses, data characters may be omitted if the code remains unique.

Field description on Process-Related Identification
Fields Content
F1, F2, F3 System and plant classification
A1, A2 Mechanical, electrical, control and instrumentation equipment classification
B1, B2 Component, signals and signal applications classification

Examples of codes

Break down of =10LBA10BR001
Total plant System Equipment code Component code
unit 1 Main steam piping system 10 pipe 001  
=1 0LBA10 BR001  
Break down of =00LAC10AP001KP01
Total plant System Equipment code Component code
unit 0 Feedwater pump system 10 pump unit 001 pump 01
=0 0LAC10 AP001 KP01
Break down of +G0BFA20·C2
Total plant Installation unit code   Installation space code
unit G Low-voltage main distribution board   floor, location 2
+G 0BFA20 · C2
Break down of +L0UMA10R01
Total plant Structure identification Room identification
unit L Steam turbine building Room 01
+L 0UMA10 R01

Function Key (Main Groups)

With the KKS system the main systems of a power station are identified by using a function key.

A Grid and distribution systems
C Instrumentation and control equipment
MA Steam turbine plant
PA Circulating water system
Main Groups
A Grid and distribution systems
B Power transmission and auxiliary power supply
C Instrumentation and control equipment
E Conventional fuel supply and residues disposal
F Handling of nuclear equipment
G Water supply and disposal
H Conventional heat generation
J Nuclear heat generation
K Reactor auxiliary systems
L Steam, water, gas cycles
M Main machine sets
N Process energy supply for external users
P Cooling water system
Q Auxiliary systems
R Gas generation and treatment
S Ancillary systems
U Structures
W Renewable energy plants
X Heavy machinery (not main machine sets)
Z Workshop and office equipment

Function Key (Main Groups and Subgroups)

Examples for Main Groups and Subgroups:

A Grid and distribution systems
AT Transformer equipment
AU Open-loop control, checkback and auxiliary equipment
AV Marshalling Racks
AW Instrument Panels
B Power transmission and auxiliary power supply
BA Power transmission
BAA Generator leads
BAB Foundation cabinets
BAC Generator circuit breaker, also commutating pole circuit breaker, including cooling system
BAT Generator Transformers, including cooling system
BB Medium voltage distribution boards and transformers, normal system
BBA - BBS MV distribution boards
BBT MV auxiliary power transformers
E Conventional fuel supply and residiues disposal
EA Unloading and storage of solid fuels
EAA Ship unloading system
EAB Rail wagon and truck unloading bay
EAC Transport system
EAD Stacking system
ET Ash and slag removal system
ETA Wet ash conveying system
ETB Storage or settling pond for wet ash
ETC Wet ash dregger
ETD Conveying system for granulate
ETE Storage system for granulate
ETG Conveying system for dry ash
ETH Storage system for dry ash
H Conventional heat generation
HA Pressure system
HAA LP part-flow feed heating system (flue gas heated)
HAB HP part-flow feed heating system (flue gas heated)
HAC Economizer system
HAD Evaporator system
HF Bunker, feeder and pulverizing system
HFA Bunker for pulverizing system
HFB Feeder system
HFC pulverizing system (incl. classifier)
HFD Flue gas return system
HFE Mill air system, carrier air system
HH Main firing system (electric-powered as well)
HHA Main burners
HHB Retarded combustion grate
HHC Grate combustion system
HHD Other burner equipment (e.g. vapour burner, flue dust burner)
HHE Pulverized coal bin, forwarding and distribution system
HHF Oil temporary storage, pump and distribution system
HHG Gas pressure reduction, distribution system
HL Combustion air system (primary air, secondary air)
HLA Ducting system
HLB Fan system, forced draught fan system
HLC External air heating system (not flue gas heaed)
HLD Air heating system (flue gas heated)
HN Flue gas exhaust (without flue gas treatment)
HNA Ducting system
HNC induced draught fan system
HNE Smoke stack system (chimney)
HNF Flue gas recirculation system
L Steam, water, gas cycles
LA Feedwater system
LAA Storage, deaeration (incl. feedwater tank)
LAB Feedwater piping system (excl. feedwater pump and feedwater heating system)
LAC Feedwater pump system
LAD HP feedwater heating system
LAE HP desuperheating spray system
LB Steam system
LBA Main steam piping system
LBB Hot reheat piping system
LBC Cold reheat piping system
LBD Extraction piping system
LC Condensate system
LCA Main condensate piping system
LCB Main condensate pump system
LCC LP feedwater heating system
M Main machine sets
MA Steam turbine plant
MAA HP turbine
MAB IP turbine
MAC LP turbine
MAD Bearings
MAG Condensing system
MB Gas turbine plant
U Structures
UH Structures for conventional heat generation
UHA Steam generator enclosure, steam generator building (boiler house)
UHF Bunker bay
UM Structures for main machine sets
UMA Steam turbine building
UMB Gas turbine building
UMC Gas and steam tubine building

Equipment Unit Key (Main Groups)

Unit Key
Main Groups Example
A Mechanical equipment AA - valves
B Mechanical equipment BQ - supports
C Direct measuring circuits CP - pressure measuring
D Closed loop control DF - flow, rate
E Analog and binary signal conditioning ER - reactor protection
F Indirect measuring circuits FD - density measuring
G Electrical equipment GQ - power sockets
H Subassemblies of main and heavy machinery HD - bearing assembly
J Nuclear assemblies JN - neutron sources

Equipment Unit Key (Main Groups and Subgroups)

Examples for Main Groups and Subgroups of equipment unit keys:

A Mechanical Equipment
AA Valves, Dampers, etc., incl. actuators, also manual
AB Isolating elements, air lock
AC Heat exchangers, heat transfer surfaces
AE Turning, cranes, hoists, lifts, driving, lifting and slewing gear (also manipulators)
AF Continuous conveyors, feeders
AG Generator units
AH Heating, cooling, air conditioning units
AJ Size reduction equipment, only as part of process
AK Compacting and packaging equipment, only as part of process
AM Mixer, agitators
AN Compressor units, fans
AP Pump units
AS Adjusting and tensioning equipment for non-electrical variables
AT Cleaning, drying, filtering and separation equipment ,excl. *BT*
B Mechanical Equipment
BB Storage eqipment (vessels, tanks)
BE Shafts (for erection and maintenance only)
BF Foundations
BN Jet pumps, ejectors, injectors
BP Flow restrictors, limiters, orifices (not metering orifices)
BQ Hangers, Supports, racks, piping penetrations
BR Piping, ductwork, chutes
BS Silencers
C Direct measuring circuits
CB Radiation variables, e. g. thermal radiation, flame monitoring (other than *CR* oder *CQ*)
CD Density
CE Electrical variables (e. g. el. current, voltage, el. power, el. frequency)
CF Flow, rate
CG Distance, length, position, direction of rotation
CH Manual input (as manually operated sensor) (e. g. fire detector)
CJ Power (mechanical, thermal)
CK Time
CL Level (also for dividing line)
CM Moisture, humidity
CP Pressure
CQ Quality variables (analysis, material properties other than *DD*, *DM*, *DV*)
CR Radiation variables
CS Velocity, speed, frequency (mechanical), acceleration
CT Temperature
D Closed loop control cirquits

Component Key (Main Groups)

Main Groups Example
K Mechanical components KC - heat exchangers
M Mechanical components MT - turbines
Q Instrumental and control components QR - instrument piping
X Signal origin
Y Signal application
Z Gated signals

Standards and further development

KKS will be replaced by RDS-PP which is in fully accordance with the standard IEC 61346. For the document kind classification code IEC 61355 is applied.

External links



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