SN EN 13785 : 2005 + A1 2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
  3.1 General terms and definitions
  3.2 Terms and definitions concerning gas
  3.3 Terms and definitions concerning pressures
  3.4 Terms and definitions concerning rates
4 Types of regulators
  4.1 Introduction
  4.2 Regulators for installations where the final regulator
      supplies a pressure specified in EN 437
  4.3 Other regulators
5 Constructional characteristics
  5.1 General
  5.2 Materials
  5.3 Special requirements
      5.3.1 Pressure sensing subassembly
      5.3.2 Regulation subassembly
      5.3.3 Back pressure subassembly
      5.3.4 Connection subassembly
  5.4 Mechanical strength
      5.4.1 Resistance to impact
      5.4.2 Resistance to pressure
      5.4.3 Strength of connections
  5.5 Soundness
  5.6 Mechanical endurance
      5.6.1 General requirements
      5.6.2 Special requirements
  5.7 Resistance to humidity changes
  5.8 Resistance to corrosion
6 Performance characteristics
  6.1 General
      6.1.1 Introduction
      6.1.2 Supply pressure
      6.1.3 Regulated pressure
  6.2 Supply pressure and regulated pressure according to 4.2
      6.2.1 Single stage fixed regulator for EN 437 pressures
      6.2.2 Two stages fixed or adjustable regulators for EN 437
            pressures
      6.2.3 Three stages fixed or adjustable regulators for
            EN 437 pressures
  6.3 Variable regulators
  6.4 Regulators out of the pressures of EN 437
7 Test methods
  7.1 General conditions
      7.1.1 Type of test gas
      7.1.2 Test conditions
      7.1.3 Equivalence formulas
      7.1.4 Test samples
  7.2 Verification of constructional characteristics
      7.2.1 Resistance to impact
      7.2.2 Resistance to pressure
      7.2.3 Mechanical strength of connections
      7.2.4 Regulation subassembly
      7.2.5 Soundness
      7.2.6 Mechanical endurance
      7.2.7 Resistance to humidity changes
      7.2.8 Resistance to corrosion
  7.3 Verification of performance characteristics
      7.3.1 General
      7.3.2 Plotting of the performance curves
8 Marking, packaging, instructions
  8.1 General
  8.2 Marking of the regulator
  8.3 Packaging
  8.4 Instructions for installation, use and maintenance
Annex A (normative) Special requirements for regulators fitted
        with pressure or rate operated safety devices
      A.1 Regulators fitted with an over-pressure relief
          A.1.1 Definition
          A.1.2 Constructional characteristics
          A.1.3 Performance characteristics
          A.1.4 Test methods
          A.1.5 Regulator marking
      A.2 Regulators fitted with an over-pressure shut off
          safety valve
          A.2.1 Definition
          A.2.2 Constructional characteristics
          A.2.3 Performance characteristics
          A.2.4 Test methods
      A.3 Regulators fitted with an under-pressure shut off
          safety device
          A.3.1 Definition
          A.3.2 Constructional and performance characteristics
          A.3.3 Test methods
      A.4 Regulators fitted with an excess flow valve
          A.4.1 Definition
          A.4.2 Performance characteristics
          A.4.3 Test methods
          A.4.4 User and maintenance instructions
      A.5 Regulators fitted with a regulated pressure limiter
          A.5.1 Definition
          A.5.2 Constructional and performance characteristics
          A.5.3 Test methods
          A.5.4 User and maintenance instructions
Annex B (normative) Special requirements for regulators fitted
        with a thermal cut out
      B.1 Definition
      B.2 Constructional characteristics
      B.3 Performance characteristics
      B.4 Test methods
Annex C (normative) Special requirements for low pressure
        regulators under extreme temperature conditions
        (temperatures below -20 degree C)
Annex D (normative) Method for measuring leaks at test pressures
        less than or equal to 16 bar
      D.1 Scope
      D.2 Diagram of the test bench
      D.3 Coefficient K
          D.3.1 Method
          D.3.2 Calculations
      D.4 Measurement of the leak
          D.4.1 Method
          D.4.2 Calculations
      D.5 Checks
Annex E (normative) Complementary test requirements for non
        metallic thermoplastic or thermalsetting materials used
        in the construction of regulators
      E.1 Scope
      E.2 Materials
      E.3 Special conditions for carrying out the tests
          mentioned in the body of the document
          E.3.1 Resistance to impact
          E.3.2 Mechanical resistance of connections
          E.3.3 Soundness
      E.4 Special requirements
          E.4.1 Resistance to hydrocarbons
          E.4.2 Resistance to cracking under stress and when
                chemical agents are present
          E.4.3 Characteristics relating to fire resistance
          E.4.4 Accelerated ageing
      E.5 Sampling and order of tests
Annex F (normative) Requirements for elastomeric reinforced
        diaphragms
Annex G (normative) Inlet connections
Annex H (normative) Outlet connections
Annex I (informative) Test method for resistance to corrosion
      I.1 Principle
      I.2 Reagents
          I.2.1 Saline solution
          I.2.2 Compressed air
          I.2.3 Salt mist
      I.3 Apparatus
          I.3.1 Spraying chamber
          I.3.2 Sprayers
          I.3.3 Heating device
          I.3.4 Salt solution supply device
          I.3.5 Compressed air supply device
          I.3.6 Mist collectors
      I.4 Test method
          I.4.1 Method of exposure of regulators
          I.4.2 Duration of tests
          I.4.3 Checks
          I.4.4 Cleaning of regulators
      I.5 Results
Annex ZA (informative) Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 90/396/EEC
Bibliography

Describes the constructional and operational characteristics, the safety requirements, test methods and the marking of regulators having a capacity of less than or equal to 100 kg/h, other than the regulators covered by EN 12864, for butane, propane or their mixtures, in the gaseous phase.