aircraft washing design

Project: Aircraft Washing Facilities, Agensi Penguatkuasaan Maritim Malaysia Supplier: Spraying Systems (Malaysia) Sdn Bhd Length of aircraft : 19.8 m (nose to tail) Approximate washing time : 25seconds (assumed walking pace for 19.8m) Wingspan : 93 ft 10 in. (28.60 m) Width for one side of wing : 13.05 m Height of wing : ~ 3.78 m Width of tailplane : 36 ft 0 in. (10.97 m) Height of tailplane : ~ 5.60 m (from ground) Width of fuselage : 2.50 m Height of fuselage : 0.60 m (from ground) Width between wheels : 5.25 m Height of tail : 2.10 m (from ground)

1) TOP SPRAY Nozzle : B1/4MEG-4050 Flow Rate : 19.7 litre/min @ 3 bar, 30 litre/min @ 7 bar Spray Angle : 40 degree Spray Pattern : Flat Spray Objective: for rinsing on top sides of fuselage and wings. Table 1: B1/4MEG-4060 (4050) Spraying Downward – Actual Spray Data

Coverage for one (1) nozzle, metre Pressure, bar Spray height = 4.2 m Spray height = 5.2 m

3 ~ 2.1 ~ 2.1 4 ~ 2.1 ~ 2.1 7 ~ 2.1 ~ 2.1

Note: All measurement taken while wind disturbance is minimal Quantity of nozzles required for top spray : 30 nos. Spray height (hanger to wingspan) : ~ 6.5 metres (to be confirmed) Overlapping between nozzles : 50% to counter wind disturbance Total coverage : 32 metres for safety allowance Nozzle to nozzle spacing : 1.07 m Flow rate @ 3 bar = 19.7 lpm x 30 nos. = 591 litre/min Flow rate @ 7 bar = 30.0 lpm x 30 nos. = 900 litre/min Pipe size required: 4” Note:

1) recommended water pipe inlet from middle section of pipe header. 2) nozzle installed on hanger/header to be oriented to spray outward from the storage

building to prevent flooding.

2) BOTTOM SPRAY 2.2) Underside of Fuselage Nozzle: B1/4MEG-4060 Flow Rate: 24 litre/min @ 3 bar, 36 litre/min @ 7 bar Spray Angle: 40 degree Spray Pattern: Flat Spray Objective: for rinsing on the underside of fuselage. Tables below presents actual spray data at different operating pressure using three (3) nozzle models, so as to ascertain the suitable nozzle to be used. Table 2: 1/4MEG-4060 Spraying Upward

Coverage for one (1) nozzle, metre Pressure, bar Spray height =

1.0 m Spray height =

2.3 m

Nozzle can spray up > 2.1m ?

4 ~ 0.65 Yes 5 ~ 1.00 7 Yes

Table 3: FullJet 3/8G-1550 Spraying Upward



4 - - - 7 ~ 0.20 - Yes

Table 4: VeeJet 2560 Spraying Upward



4 ~ 0.55 - Yes 7 ~ 0.55 - Yes

Note: All measurement taken while wind disturbance is minimal Quantity of nozzles required : 6 nos. Overlapping between nozzles : 30% to counter wind disturbance Total coverage : 3.0 metres for safety allowance Nozzle to nozzle spacing : 0.50 m Flow rate @ 3 bar = 24 lpm x 6 nos. = 144 litre/min Flow rate @ 7 bar = 36 lpm x 6 nos. = 216 litre/min Pipe Size: 4”

2.2) Underside of Wing Nozzle: B1/4MEG-2550 (nozzle) Flow Rate: 19.7 litre/min @ 3 bar, 30.0 litre/min @ 7 bar Spray Angle: 25 degree Spray Pattern: Flat Spray Objective: for rinsing on the underside of fuselage. Tables below presents actual spray data at different operating pressure using three (3) nozzle models, so as to ascertain the suitable nozzle to be used. Table 5: WashJet 1/4MEG-4040 Spraying Upward



3 - - - 5 1.20 1.92 Yes, very weak 7 1.10 1.92 Yes, rather weak

Table 6: WashJet 1/4MEG-2550 Spraying Upward



3 0.74 1.44 Yes, weak 5 0.78 1.44 Yes, rather weak 7 0.75 1.28 Yes, acceptable

Table 7: WashJet 1/4MEG-2560 Spraying Upward



3 0.75 1.44 Yes, weak 5 0.74 1.44 Yes, rather weak 7 0.78 1.28 Yes, acceptable

Note: 1/4MEG-2560 has higher spray up distance compare to 1/4MEG-2550. Nozzle model choosen : B1/4MEG-2550 Quantity of nozzles required : 15 nos. (for one side of wing) Overlapping between nozzles : 30 % to counter wind disturbance Total coverage : 14 metres for safety allowance Nozzle to nozzle spacing : 0.93 m Flow rate @ 3 bar = 19.7 lpm x 15 nos. = 295.5 litre/min x 2 wings = 591 litre/min Flow rate @ 7 bar = 30.0 lpm x 15 nos. = 450.0 litre/min x 2 wings = 900 litre/min Pipe Size: 4”

Note:

1) may not reach underside of body tail which is 2.1m from ground, manual wash with spray gun is needed.

2) cannot not reach underside of tailplane (vertical fin of wing tail) which is 5.6m from ground, manual wash with spray gun is needed.

Total flow required @ 7 bar from (1) & (2) above = 900 + 216 + 900 = 2,016 litre/min (121 m3/hour) 100m head for Wilo pump MVI 9505 Volume spray in 25 seconds @ 7 bar = 840 litre/min (< 1.0 m3/min) Recommended tank size required = 3 m3

2.5m0.6m

4.0m

3) HAND HELD SPRAY GUN Model: AAB70 (Spray Gun) + B23990-1/4-22 (Adjustable WashJet) +

B20400-1/4M-36-IENP (36” extension) + B15950 (3/8” Swivel Connector)

Specification of AAB70 Maximum operating pressure: 5000 psi (345 bar) Maximum flow capacity: 10 gpm (38 l/min) Maximum operating temperature: 300˚ F (150˚ C) Inlet connection: 3/8" NPT (F) or BSPT (F) Outlet connection: 1/4" NPT (F) or BSPT (F) Weight: 25 oz. (715 g) Dimensions: 7.83" x 7.56" x 1.35" (19.9 x 19.2 x 3.4 cm) Flow required from pump (aircraft area) : 38 lpm x 2 spray gun = 76 litre/min Maximum flow rate from B23990-1/4-22 : 15.7 litre/min @ 10 bar Total flow rate from 2 nozzles : 31.5 litre/min @ 10 bar 26.3 litre/min @ 7 bar 22.3 litre/min @ 5 bar Pump capacity required : >10 bar head, 26.3 litre/min (1.6m3/hr) Single phase input

aircraft washing design

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