Design of Septic Tank

Plumbing Fixtures

Ground Floor Watercloset/ bidet Kitchen Sink Wash basin Floor drain Urinal Hose bib Shower Footwash Clothes washer Second Floor Watercloset Wash basin Floor drain Shower Footwash Bath tub Roof Deck Watercloset Wash basin Floor drain Shower Footwash

Qty 3 1 2 3

DFU 4 2 1 2 3

2 2 2 1

2 2

4 4 4 4 4 1

4 1 2 2

Watercloset Wash basin Floor drain Shower Footwash

Trap & trap arm size (inch) 3 1.5 1.25 2

16 4 8 8 0 2

3 1.25 2

4 1 2 2

0 1 0 0 0

3 1.25 2

4 1 2 2

0 0 0 0 0

2

1

Total DFU 12 2 2 6 0 0 4 0 2

GRAND TOTAL References: DFU p.80 NPCP (94/230) WSFU p.56 NPCP (87/230)

WSFU 5 2 1

Total WSFU 15 2 2

2 3 2 2 2

0 6 4 4 2

5 1

20 4

2 2 2

8 8 2

5 1

0 1

2 2

0 0

5 1

0 0

2 2

0 0

67

NSPC Table 16.3.7 Sewage Flow per day Table 16.6.1 Capacity of Septic Tanks

Comparisson of Nspc and NPC 20 0.25 20.828

Elevated Tank No Of Occupants 5 Fixture Watercloset Wash basin Shower Footwash Elevated Tank Volume: Hydropneumatic: Net Elevated Tank Volume:

78

Diameter Height

Note: As per table B-2 (Capacity of septic tanks) the min septic tank capacity for 5 or 6 bedroom is 1500 gals plus 150 gals. Per extra bedroom Minimum Capacity:

3

1500

ft =

Total clear dimensions of septic tank: width= 1.50 Fluid depth= 1.20 q(Select) length= 3.15 say Volume:

5.76 m

Length Primary= Secondary=

2.13 1.07

3

5.68 m

3

(See septic tank construction p. 181, NPCP) Pump discharge:

(Capacity is sufficient)

say say

2.20 1.50

Length

Width

Depth

Volume

2.20

1.50

1.20

3.96 m

3

2.70 m

3

1.50

1.50

1.20

Total head: Power: 0.009367

Digestion Total Capacity:

20mm 15mm

3.20

Chamber Leaching

HEAD LOSS

(See Table B-2, NPCP)

Use Table of Conversion of WSFU to GPM. Pdf WSFU:

78

SAY

6.66 m 3

a= b=

1.50 2.20

m m

c= d= wtotal= ltotal= h= htotal=

0.75 1.60 1.90 4.10 1.20 1.85

m m m m m m

Ground Floor PVC pipes 50 mmØ 100 mmØ Wye -100x90 -100x50 Reducer -100x90 Cleanout cover , -50 Second Floor PVC pipes 50 mmØ 100 mmØ

Length

Pcs

2.4 133.5708

1 23

3

1

Length

8 Pcs

34.9932 8.338

6 2

Wye -100x100 -100x50 -50x50 Reducer -100x50 Cleanout cover , -50 Third Floor PVC pipes 50 mmØ 100 mmØ Wye -100x100 -100x50 -50x50 Reducer -100x50 Cleanout cover , -50

Septic Tank: CHB: -15"thk -10"thk Def. Bar 10mmdia x 6m Concrete

4 2 3 4 2 Length

Pcs

34.3816 8.338

6 2

4 2 3 4 2

Septic Tank Depth (m): 0.6 0.8 1 1.2 1.4 1.6 1.8

240 30 17 13

pcs pcs pcs bags

Table 16.3.7 Sewage Flow per day Table 16.6.1 Capacity of Septic Tanks

Comparisson of Nspc and NPC mm/m in/ft mm/m

#VALUE! 265 gals qty 2 2 2 2

discharge 20 li/flush 20 li/min 30 li/min 15 li/min

time/ usage 5 20 15 5

Volume 200 800 900 150 2050 li

541.6116 gal

265 US 32.5 say Net Elevated Tank Volume:

50 gals 215 say 200 US Gal

0.5 m 5.108364377 m

Pipe Length

HL

6.04 0.605268 26.313 2.998893 3.604161

10 gpm

Shower pressure head requirement Discharge rate:

7 gpm 3

0.000441583 m /s 2.498850499 m/s 0.318259624 m

Velocity: Head requirement:

Standard Requirement for Grohe "Rain Pan" Shower Head: 14.47 psi

73.9726833 ft 139.5664943 watts

10.19 m Hydroneumatic Tank Sizing:

where: Vu= (5mins)x(largest booster/transfer pump capacity in gpm)= Usable volume in gallons 80

GPM

Pin= cut-in pressure in psi Pout= cut-out pressure in psi Booster/Transfer pump max cap= Vu= P in =

20.00 100.00 25.00

gpm gallons (cut-in pressure)

P out =

40.00 364.67

(cut-out pressure) U.S. gals

Gross Volume= Tank height=

1.38 2.75

m3 m (assuming 0.8m diameter)

References: *See page 245 Gillesania *Storage Tank Design and Guidelines.pdf * difference between cut-in and cut-out pressure should be 15-20psi