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  Gas Pipe Sizing Calculator   get-attachment
pipe type        
    gas type density            
  insert your information in the yellow boxes            
           
  KW net / Gross / M3/Hr   Number   Pipe Size
mm
  kWgross kW 45 Form Bends       
  kWnett kW 90 Form Bends    Gas Rate m3/hr
  m3/hr m3/hr 90 elbows         
  kWgross kW tee flow entering branch    Length m
  kWnet kW tee flow exiting branch         
  M3/hr m3/hr Actual Pipe Length    Pressure Drop mb
                           
             
                 
  Typical Equivilent Pipesizes For fittings Equivilent Lengths in Meters
        Form Bends: using bending machine or spring Fittings: Compression / Soldered / Xpress etc
           
 
 
  Copper / TRAC Pipe Low Carbon Steel PE / MDPE ≤ 45° >45°- 90° 90° elbow Tee (Flow entering the branch) Tee (Flow exiting the branch)
  ≤ 15mm ≤ 1/2" ≤ 20mm 0.15 0.20 0.40 0.75 1.20
  22mm 3/4" 25mm 0.20 0.30 0.60 1.20 1.80
  28mm 1" 32mm 0.25 0.40 0.80 1.50 2.30
  35mm 1 1/4" 40mm 0.30 0.50 1.00 2.00 3.00
  PRESSURE LOSS FROM THE METER TO THE APPLIANCES MUST BE CALCULATED TO CONFIRM IF IT IS WITHIN THE ALLOWABLE PRESSURE DROPS 1MB FOR NATURAL GAS / 2MB FOR L.P.G.  
  STEP1. Appliances Maximum Heat input kw net Maximum Gas Rate   STEP 4. Add the pipework section pressure drops from the meter to each applaince TOTAL PRESSURE DROP MB SATISFACTORY?  
                       
                       
                       
                       
  STEP 2. SKETCH THE PIPE WORK LAYOUT INDICATING PIPE LENGTHS AND LABELS I.E. A-B, B-C,        
  STEP 3. PIPEWORK SECTION MAXIMUM HEAT INPUT NET MAXIMUM FLOW RATE ESTIMATED PIPE SIZE PIPE LENGTH FITTINGS EQIVILENT LENGTH TOTAL EQUIVILENT LENGTH PRESSURE LOSS / METRE PRESSURE LOSS        
  YOUR LABEL COLUMN A FROM THE TABLES COLUMN A FROM THE TABLES MM METRES TYPE METRES FROM TABLE B ADD PIPE LENGTH AND FITTINGS LENGTH MBAR/M FROM TABLE A MULTIPLY EQUIVILENT LENGTH BY PRESSURE LOSS        
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