When designing your Blutube compressed air system current and future requirements need to be considered for: -how much air is needed? -what pressure is required? -what is the distance from compressor plant to outlets? -does allowance need to be made for future expansion? Select an appropriate pipe size from the chart below allowing for the above factors and ensuring distance of flow is included in the calculations.
Maximum recommended air flow for each pipe size. The flow values allow for a 4% pressure drop of applied pressure over 30 metres of pipe. If a maximum pressure drop of 2% is desired, figures listed below should be de-rated by approximately 20%-30%. The table is calculated using values derived from Mueller’s formula for gaseous flows.
1 psi = 0.069bar
1 kpa = 0.145psi
1 bar = 100kpa
1 bar = 14.5psi
1 kg/cm2 = 1 bar
1 cfm = 0.4719 L/sec
1 I/sec = 2.119 cfm
1 m3/min = 16.67 L/sec
1 m3/min = 35.3147 cfm
APPROXIMATE COMPRESSOR OUTPUT CALCULATION:
1kw x 1.35 = HP x 4 =CFM for Screw compressors.
For Piston compressors some manufacturers quote displacement which needs to be derated by 0.75 to calculate F.A.D. (Free Air Delivery).
Size of receivers shall be calculated as 10 times the flow in l/s optimum or 6 times the flow in l/s minimum.
Select from the three ranges of fittings, note that a combination is often used.
Electro Fusion Weld Fittings
Blutube electro fusion fittings are assembled by hand and welded via an electro fusion weld machine. These fittings can be assembled and aligned/adjusted prior to welding. They are ideal for large bore pipework being quick and easy to work with. This range includes “underpressure air saddles” which are designed for under pressure connections. They eliminate the need to shut down plant and equipment for new connections and are ideally suited to 24 hour operations.