|
UNI CEN/TR 16395 : 2014
|
GAS INFRASTRUCTURE - CEN/TC 234 PRESSURE DEFINITIONS GUIDELINE DOCUMENT |
|
DIN EN 16348 : 2013
|
GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEM (SMS) FOR GAS TRANSMISSION INFRASTRUCTURE AND PIPELINE INTEGRITY MANAGEMENT SYSTEM (PIMS) FOR GAS TRANSMISSION PIPELINES - FUNCTIONAL REQUIREMENTS |
|
CEN/TR 13737-2 : 2014
|
GAS INFRASTRUCTURE - IMPLEMENTATION GUIDE FOR FUNCTIONAL STANDARDS PREPARED BY CEN/TC 234 - PART 2: NATIONAL PAGES RELATED TO CEN/TC 234 STANDARDS |
|
12/30258747 DC : DRAFT MAR 2012
|
BS EN 12583 - GAS INFRASTRUCTURE - COMPRESSOR STATIONS - FUNCTIONAL REQUIREMENTS |
|
PREN 1594 : DRAFT 2013
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE OVER 16 BAR - FUNCTIONAL REQUIREMENTS |
|
BS PD CEN/TR 16787 : 2014
|
INDUSTRIAL GAS INSTALLATION - GUIDELINE |
|
BS EN 12007-5 : 2014
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 5: SERVICE LINES - SPECIFIC FUNCTIONAL REQUIREMENTS |
|
DIN EN 16348 E : 2013
|
GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEM (SMS) FOR GAS TRANSMISSION INFRASTRUCTURE AND PIPELINE INTEGRITY MANAGEMENT SYSTEM (PIMS) FOR GAS TRANSMISSION PIPELINES - FUNCTIONAL REQUIREMENTS |
|
BS PD CEN/TR 15339-4 : 2014
|
THERMAL SPRAYING - SAFETY REQUIREMENTS FOR THERMAL SPRAYING EQUIPMENT - PART 4: GAS AND LIQUID FUEL SUPPLY |
|
DIN EN 15001-1 : 2011
|
GAS INFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING |
|
CEN/TR 16787 : 2014
|
INDUSTRIAL GAS INSTALLATION - GUIDELINE |
|
PREN 12007-1 : DRAFT 2010
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 1: GENERAL FUNCTIONAL RECOMMENDATIONS |
|
12/30257022 DC : 0
|
BS EN 13611 - SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
13/30277457 DC : 0
|
BS EN 1776 - GAS INFRASTRUCTURE - GAS MEASURING SYSTEMS - FUNCTIONAL REQUIREMENTS |
|
DIN EN 15001-1 E : 2011
|
GAS NFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING |
|
BS PD CEN/TR 16395 : 2012
|
GAS INFRASTRUCTURE - CEN/TC 234 PRESSURE DEFINITIONS - GUIDELINE DOCUMENT |
|
CEN/TS 15399 : 2007
|
GAS SUPPLY SYSTEMS - GUIDELINES FOR MANAGEMENT SYSTEMS FOR GAS DISTRIBUTION NETWORK |
|
PREN 14382 : DRAFT 2016
|
GAS SAFETY SHUT-OFF DEVICES FOR INLET PRESSURE UP TO 100 BAR |
|
12/30262935 DC : 0
|
BS EN 15339-4 - THERMAL SPRAYING - SAFETY REQUIREMENTS FOR THERMAL SPRAYING EQUIPMENT - PART 4: GAS AND LIQUID FUEL SUPPLY |
|
12/30259203 DC : 0
|
BS EN 12007-5 - GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 5: SERVICE LINES, SPECIFIC FUNCTIONAL REQUIREMENTS |
|
13/30271116 DC : 0
|
BS EN 1594 - GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE OVER 16 BAR - FUNCTIONAL REQUIREMENTS |
|
UNE EN 16348 : 2014
|
GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEM (SMS) FOR GAS TRANSMISSION INFRASTRUCTURE AND PIPELINE INTEGRITY MANAGEMENT SYSTEM (PIMS) FOR GAS TRANSMISSION PIPELINES - FUNCTIONAL REQUIREMENTS |
|
UNI EN 12007-5 : 2014
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 5: SERVICE LINES - SPECIFIC FUNCTIONAL REQUIREMENTS |
|
10/30208792 DC : 0
|
BS EN 12007-1 - GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 1: GENERAL FUNCTIONAL RECOMMENDATIONS |
|
DIN EN 12007-5 E : 2014
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 5: SERVICE LINES - SPECIFIC FUNCTIONAL REQUIREMENTS |
|
BS EN 16348 : 2013
|
GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEM (SMS) FOR GAS TRANSMISSION INFRASTRUCTURE AND PIPELINE INTEGRITY MANAGEMENT SYSTEM (PIMS) FOR GAS TRANSMISSION PIPELINES - FUNCTIONAL REQUIREMENTS |
|
BS EN 15001-1 : 2009
|
GAS INFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING |
|
DIN EN 12007-5 : 2014
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMIUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 5: SERVICE LINES - SPECIFIC FUNCTIONAL REQUIREMENTS |
|
NF EN 15001-1 : 2009
|
GAS INFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING |
|
CEN/TR 15339-4 : 2014
|
THERMAL SPRAYING - SAFETY REQUIREMENTS FOR THERMAL SPRAYING EQUIPMENT - PART 4: GAS AND LIQUID FUEL SUPPLY |
|
BS PD CEN/TR 13737-2 : 2014
|
GAS INFRASTRUCTURE - IMPLEMENTATION GUIDE FOR FUNCTIONAL STANDARDS PREPARED BY CEN/TC 234 - PART 2: NATIONAL PAGES RELATED TO CEN/TC 234 STANDARDS |
|
11/30253117 DC : 0
|
BS EN 16348 - SAFETY MANAGEMENT SYSTEM (SMS) FOR GAS INFRASTRUCTURE AND PIPELINE INTEGRITY MANAGEMENT SYSTEM (PIMS) FOR GAS TRANSMISSION PIPELINES - FUNCTIONAL REQUIREMENTS |
|
UNI EN 16348 : 2013
|
GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEM (SMS) FOR GAS TRANSMISSION INFRASTRUCTURE AND PIPELINE INTEGRITY MANAGEMENT SYSTEM (PIMS) FOR GAS TRANSMISSION PIPELINES - FUNCTIONAL REQUIREMENTS |
|
04/30117386 DC : DRAFT JUL 2004
|
EN 334 - GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR |
|
SR 12007-5:2016
|
GUIDANCE ON THE APPLICATION OF I.S. EN 12007-5:2014, GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 5: SERVICE LINES - SPECIFIC FUNCTIONAL REQUIREMENTS |
|
I.S. EN 16348:2013
|
GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEM (SMS) FOR GAS TRANSMISSION INFRASTRUCTURE AND PIPELINE INTEGRITY MANAGEMENT SYSTEM (PIMS) FOR GAS TRANSMISSION PIPELINES - FUNCTIONAL REQUIREMENTS |
|
ONORM EN 334 : JUN 2009
|
GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR |
|
16/30338132 DC : 0
|
BS EN 15399 - GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEMS FOR GAS NETWORKS WITH MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR |
|
I.S. EN 334:2005
|
GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR |
|
SR CEN/TS 15399:2007
|
GAS SUPPLY SYSTEMS - GUIDELINES FOR MANAGEMENT SYSTEMS FOR GAS DISTRIBUTION NETWORK |
|
SR CEN/TR 16395:2012
|
GAS INFRASTRUCTURE - CEN/TC 234 PRESSURE DEFINITIONS - GUIDELINE DOCUMENT |
|
SR CEN/TR 13737-2:2014
|
GAS INFRASTRUCTURE - IMPLEMENTATION GUIDE FOR FUNCTIONAL STANDARDS PREPARED BY CEN/TC 234 - PART 2: NATIONAL PAGES RELATED TO CEN/TC 234 STANDARDS |
|
I.S. EN 12007-5:2014
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 5: SERVICE LINES - SPECIFIC FUNCTIONAL REQUIREMENTS |
|
SR CEN/TR 15339-4:2014
|
THERMAL SPRAYING - SAFETY REQUIREMENTS FOR THERMAL SPRAYING EQUIPMENT - PART 4: GAS AND LIQUID FUEL SUPPLY |
|
SR CEN/TR 16787:2014
|
INDUSTRIAL GAS INSTALLATION - GUIDELINE |
|
BS EN 13611 : 2015
|
SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
UNI EN 334 : 2009
|
GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR |
|
17/30360051 DC : 0
|
BS EN 13611 - SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
16/30334287 DC : 0
|
BS EN 334 - GAS PRESSURE REGULATORS FOR INLET PRESSURE UP TO 100 BAR |
|
16/30334290 DC : 0
|
BS EN 14382 - GAS SAFETY SHUT-OFF DEVICES FOR INLET PRESSURE UP TO 100 BAR |
|
UNE EN 13611 : 2016
|
SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
DIN EN 13611 : 2016
|
SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
17/30349662 DC : 0
|
BS EN 15001-1 - GAS INFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING |
|
PREN 13611 : DRAFT 2017
|
SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
DIN EN 334 : 2016
|
GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR |
|
UNE CEN/TR 16478 : 2013
|
SURVEILLANCE FROM FIRST COMMISSIONING ON MEASURING DEVICES USED IN NATURAL GAS SUPPLY TO THE INSTALLATIONS OF THE ACTIVITIES UNDER THE DIRECTIVE 2003/87/EC ESTABLISHING A SCHEME OF CO[2] EMISSIONS TRADING |
|
DIN EN 13611 E : 2019
|
Safety and control devices for burners and appliances burning gaseous and/or liquid fuels – General requirements; English version EN 13611:2019, English translation of DIN EN 13611:2019-06 |
|
EN 13611 : 2015 COR 2016
|
SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
DIN EN 13611 E : 2016
|
SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
BS PD CEN/TR 16478 : 2012
|
SURVEILLANCE FROM FIRST COMMISSIONING ON MEASURING DEVICES USED IN NATURAL GAS SUPPLY TO THE INSTALLATIONS OF THE ACTIVITIES UNDER THE DIRECTIVE 2003/87/EC ESTABLISHING A SCHEME OF CO[2] EMISSIONS TRADING |
|
SR CEN/TR 16478:2012
|
SURVEILLANCE FROM FIRST COMMISSIONING ON MEASURING DEVICES USED IN NATURAL GAS SUPPLY TO THE INSTALLATIONS OF THE ACTIVITIES UNDER THE DIRECTIVE 2003/87/EC ESTABLISHING A SCHEME OF CO[2] EMISSIONS TRADING |
|
PREN 15399 : DRAFT 2016
|
GAS INFRASTRUCTURE - SAFETY MANAGEMENT SYSTEMS FOR GAS NETWORKS WITH MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR |
|
I.S. EN 15001-1:2009
|
GAS INFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING |
|
I.S. EN 13611:2015
|
SAFETY AND CONTROL DEVICES FOR BURNERS AND APPLIANCES BURNING GASEOUS AND/OR LIQUID FUELS - GENERAL REQUIREMENTS |
|
I.S. EN 14382:2005
|
SAFETY DEVICES FOR GAS PRESSURE REGULATING STATIONS AND INSTALLATIONS - GAS SAFETY SHUT-OFF DEVICES FOR INLET PRESSURES UP TO 100 BAR |
|
DIN EN 12327 : 2012
|
GAS INFRASTRUCTURE - PRESSURE TESTING, COMMISSIONING AND DECOMMISSIONING PROCEDURES - FUNCTIONAL REQUIREMENTS |
|
DIN EN 12583 : 2014
|
GAS INFRASTRUCTURE - COMPRESSOR STATIONS - FUNCTIONAL REQUIREMENTS |
|
DIN EN 12279 : 2005
|
GAS SUPPLY SYSTEMS - GAS PRESSURE REGULATING INSTALLATIONS ON SERVICE LINES - FUNCTIONAL REQUIREMENTS |
|
DIN EN 1776 E : 2016
|
GAS INFRASTRUCTURE - GAS MEASURING SYSTEMS - FUNCTIONAL REQUIREMENTS |
|
DIN EN 1594 : 2013
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE OVER 16 BAR - FUNCTIONAL REQUIREMENTS |
|
DIN EN 12327 E : 2012
|
GAS INFRASTRUCTURE - PRESSURE TESTING, COMMISSIONING AND DECOMMISSIONING PROCEDURES - FUNCTIONAL REQUIREMENTS |
|
DIN EN 1776 : 2016
|
GAS INFRASTRUCTURE - GAS MEASURING SYSTEMS - FUNCTIONAL REQUIREMENTS |
|
DIN EN 334 E : 2009
|
GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR |
|
DIN EN 12279 E : 2005
|
GAS SUPPLY SYSTEMS - GAS PRESSURE REGULATING INSTALLATIONS ON SERVICE LINES - FUNCTIONAL REQUIREMENTS |
|
DIN EN 12007-1 E : 2012
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 1: GENERAL FUNCTIONAL REQUIREMENTS |
|
DIN EN 14382 E : 2009
|
SAFETY DEVICES FOR GAS PRESSURE REGULATING STATIONS AND INSTALLATIONS - GAS SAFETY SHUT-OFF DEVICES FOR INLET PRESSURES UP TO 100 BAR |
|
DIN EN 12007-1 : 2012
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 1: GENERAL FUNCTIONAL REQUIREMENTS |
|
DIN EN 12583 E : 2000
|
GAS INFRASTRUCTURE - COMPRESSOR STATIONS - FUNCTIONAL REQUIREMENTS |
|
DIN EN 14382 : 2016
|
SAFETY DEVICES FOR GAS PRESSURE REGULATING STATIONS AND INSTALLATIONS - GAS SAFETY SHUT-OFF DEVICES FOR INLET PRESSURES UP TO 100 BAR |
|
BS EN 12327 : 2012
|
GAS INFRASTRUCTURE - PRESSURE TESTING, COMMISSIONING AND DECOMMISSIONING PROCEDURES - FUNCTIONAL REQUIREMENTS |
|
BS EN 12583 : 2014
|
GAS INFRASTRUCTURE - COMPRESSOR STATIONS - FUNCTIONAL REQUIREMENTS |
|
UNE EN 15001-1 : 2010
|
GAS INFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING |
|
BS EN 1594 : 2013
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE OVER 16 BAR - FUNCTIONAL REQUIREMENTS |
|
BS EN 334 : 2005
|
GAS PRESSURE REGULATORS FOR INLET PRESSURES UP TO 100 BAR |
|
BS EN 14382 : 2005
|
SAFETY DEVICES FOR GAS PRESSURE REGULATING STATIONS AND INSTALLATIONS - GAS SAFETY SHUT-OFF DEVICES FOR INLET PRESSURES UP TO 100 BAR |
|
UNE EN 1776 : 2017
|
GAS INFRASTRUCTURE - GAS MEASURING SYSTEMS - FUNCTIONAL REQUIREMENTS |
|
BS EN 1776 : 2015
|
GAS INFRASTRUCTURE - GAS MEASURING SYSTEMS - FUNCTIONAL REQUIREMENTS |
|
UNE EN 12583 : 2014
|
GAS INFRASTRUCTURE - COMPRESSOR STATIONS - FUNCTIONAL REQUIREMENTS |
|
BS EN 12279 : 2000
|
GAS SUPPLY SYSTEMS - GAS PRESSURE REGULATING INSTALLATIONS ON SERVICE LINES - FUNCTIONAL REQUIREMENTS |
|
UNE EN 1594 : 2014
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE OVER 16 BAR - FUNCTIONAL REQUIREMENTS |
|
DIN EN 1594 E : 2013
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE OVER 16 BAR - FUNCTIONAL REQUIREMENTS |
|
UNE EN 12327 : 2013
|
GAS INFRASTRUCTURE - PRESSURE TESTING, COMMISSIONING AND DECOMMISSIONING PROCEDURES - FUNCTIONAL REQUIREMENTS |
|
UNE CEN/TR 16478 : 2013
|
SURVEILLANCE FROM FIRST COMMISSIONING ON MEASURING DEVICES USED IN NATURAL GAS SUPPLY TO THE INSTALLATIONS OF THE ACTIVITIES UNDER THE DIRECTIVE 2003/87/EC ESTABLISHING A SCHEME OF CO[2] EMISSIONS TRADING |
|
UNE EN 12007-1 : 2013
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 1: GENERAL FUNCTIONAL REQUIREMENTS |
|
BS EN 12007-1 : 2012
|
GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE UP TO AND INCLUDING 16 BAR - PART 1: GENERAL FUNCTIONAL REQUIREMENTS |