Re: Cement Transportation
What pressure / is your tankers rated at?
What kind of tanker tipping or belly?
What kind of air mover are you going to use?
Normal tanker rated at 2bar with onboard 2 bar compressor and this conveying route will unload within an hour. ■
Re: Cement Transportation
In my Handbook of Pneumatic Conveying Engineering (Marcel Dekker) there is comprehensive data on the conveying of OPC through a 50 m long pipeline of 4 inch NB with 9 ninety degree bends. For a pressure drop of 30 psi and 200 cfm of free air you get a flow rate of about 70,000 lb/h, with the cement conveyed at a solids loading ratio of about 70. So with your shorter pipeline with fewer bends you should be able to offload 28 tonnes in 40 to 45 minutes. ■
Re: Cement Transportation
Dear Sir,
Calculating your system, using a compressor of 6m3/min at 2.0 bar gives:
Pressure discharge Cement
Convey length = 37 m
Nu of bends= 6
Pump vol = 0 1 + 0 1 m^3/s
q-convey = 0.10 m^3/s
Dia begin = 95 mm
Dia end = 95 mm
Kettle volume = 50.0 m^3
Cement vol.= 26.0 m^3
Kettle Cement content = 28.6 tons
Pipevolume = 0.26 m^3
-----------Pipeline-------------- Syst
Press-------Cap-----. mu------Cap. . v-begin---- v-end--- kWh/ton ----res.time
2.000 ------40-------- 88--------28 -------6.0 ------16.9 ----- 0.44---------- 5.53
1.750-------37--------81--------26 --------6.5-------16.8------0.43-----------5.29
1.500 -------33-------74--------25 --------7.0 ------16.7 ------0.42-----------5.05
1.250--------29-------65-------22 ---------7.7------16.6-------0.41----------4.80
1.000--------25-------56--------20 --------8.6 -----16.5 ------0.40---------- 4.51
0.750------- 20-------45--------16--------9.7 ------16.4 ------0.41--------- 4.24
0.500--------14-------32--------12 -------11.2-----16.3------ 0.47----------3.92
0.250------- 6.7------15---------6 -------13.3-----16.1-------0.73--------- 3.60
Empty pipeline pressure ...= 559. mmWC
Unloading time, including pressurizing time of a 50 m3 bulk tank is 1 hr (28 tons/hr)
Pressurizing time 16 minutes
Discharging time 43 minutes
Silo content = 100 m3 # 140 tons
Filling time will be approx 140/28 = 5 hrs
best regards ■
Teus
Re: Cement Transportation
Thanks a lot! ■
Cement transportation
Please advise me on this:
This situation has similarities with the previous thread "cement transport", however, with different conditions:
silo capacity: 100m^3
total length of the pipe: 37meters
distance from truck to silo: 32.166m
horiz length of the pipe: 3.731m
charging pipe dia: 4in
# of bends: 6
bulk truck capacity: 28 tons
How many hours will it take to charge the silo?
Pls give us an idea on the computation...
Many thanks. ■