Plumbing Calculation

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1.         INTRODUCTION

1.1.        Project Description

This calculation covers the plumbing system for Office Building-B, Warehouse & Workshop and Electrical Building. Potable water will be supplied from Main line. While Black and Waste Water will be discharged to Septic tank. Then treated water will be directed to drainage by free flowing/gravity.

1.2.        References

This calculations are based on the following documents:

1.2.1.     Standard and Codes :

§  Uniform Plumbing Code 2000 (UPC 2000)
§  International Plumbing Code 2009 (IPC 2009)
§  National Plumbing Code 2006 (NPC 2006)
§  Standar Nasional Indonesia (SNI) no. 03-7065-2005 Tata Cara Perencanaan Sistem Plambing
§  Peraturan Menteri Negara Lingkungan Hidup Nomor 03 Tahun 2010 tentang Baku Mutu Air Limbah bagi Kawasan Industri
§  Pedoman Plambing Indonesia (PPI) 1979

1.2.2.     Reference Book

§  Soufyan, Morimura : Perancangan dan Pemeliharaan Sistem Plambing; 1991, Pradnya Paramita.

2.            OBJECTIVES

The purposes of this Plumbing calculation are to determine:
a)    Potable cold water main  pipe size
b)    Sanitary drainage (Black & Waste water) and vent main pipe size
c)     Septic Tank Capacity

3.            DESIGN BASIS AND ASSUMPTION

3.1.        Design Basis

3.1.1.     Potable Water Demand

a.     Potable water demand calculation is based on the occupants water demand.
b.     Potable water demand for 1 occupant is based on Standard of Potable Water Consumption per Day (SNI 03-7065-2005). See Appendix-2.


3.1.2.     Potable Water Pipe

a.     Potable water flow is determined using fixture unit method.
b.     Potable water supply fixture unit (WSFU) is based on the table below.

Table.1 Water Supply Fixture Unit
Plumbing Fixture/Group
Type of Supply Control
Fixture Units
Lavatory (Public)
Faucet
1
Lavatory (Private)
Faucet
1
Service sink/Janitor
Faucet
3
Shower head (Public)
Mixing valve
2
Shower head (Private)
Mixing valve
2
Urinal (Public)
Flush tank
2
Water Closet (Public)
Flush tank
2.5
Water Closet (Private)
Flush tank
2.5

Reference: Table of Water Supply Fixture Units (WSFU) and Minimum Fixture Branch Pipe Size, UPC 2000 (Appendix-3).

c.     Total of WSFU used to determine peak flow rate using Potable water fixture unit – flow Chart from  Figure of Estimate curve for demand load, ASHRAE handbook Fundamental 2009 (Appendix-4).
d.     Potable water pipes size are determined using Hazen William Table for :
-       PVC pipe (Appendix-5)
e.     Potable water distribution piping which is supply close to a plumbing fixture, follow to Water Supply Fixture Units (WSFU) and Minimum Fixture Branch Pipe Size, UPC 2000 (Appendix-3).
f.      Minimum flow pressure required is based on Standard of minimum flow pressure required for Plumbing Fixture, IPC 2009 (Appendix-6).

3.1.3.     Black and Waste Water Pipes and Vent Pipe Sizing

a.    Black and Waste water pipe size is determined by drainage fixture unit method.
b.    Drainage fixture units are refer to table below






Table.2 Drainage Fixture Unit
Plumbing Fixture/Group
Fixture Units
Kitchen sink (Public)
3
Lavatory
1
Service sink/Janitor
2
Urinal (Public)
2
Water Closet (Public)
4
Water Closet (Private)
3
Floor Drain
2

Reference: Table of Drainage Fixture Unit Values (DFU)
UPC 2000 (Appendix-7)

c.     Black and Waste water pipes and sewer pipes size are determined by table of Maximum Unit Loading and Maximum Length of Drainage and Vent piping (Appendix-8) with 1% minimum slope.
d.     Vent pipe size determined by table of Maximum Unit Loading and Maximum Length of Drainage and Vent piping (Appendix-8)


3.1.4.     Septic Tank

a.     All of Black and Waste water will be drained and treated in septic tank before discharged to external drainage
b.     Septic tank capacity is based on total capacity of disposal Black and waste water per day
c.     Disposal of Black and waste water determined based on number of occupants
d.     Septic tank will use Bio filtration system (packaged by vendor)

3.2.        Assumptions

The following assumptions are considered for the calculations:
-       Maximum recommended velocity of potable water pipe to be limited at 2.4 meter/second to get low friction (NPC 2006),
-       Sloping of Black & gray water pipe within the building shall be minimum 1% refer to table of Maximum Unit Loading and Maximum Length of Drainage and Vent piping (Appendix-8)
-       Maximum flow friction, within the pipe is 100 mm/m

3.3.        Pipe Data


Table.3 Material of Plumbing Pipe Inside Building
Service
Material
Class
Potable cold water pipe
uPVC
10 kg/cm2 (AW Class)
Black and Waste water pipe
uPVC
10 kg/cm2 (AW Class )
Vent pipe
uPVC
5 kg/cm2 (D Class )

4.            CALCULATIONS

Below are basic formulas for calculations:
1)    Potable Water Demand
a.   Potable water demand = no. of occupant (person) x Water Demand standard (ltr/psn/day)
b.   No. of Occupant:
-       Office Building-B               : Refer to PSB-E-00-A5-DW-030/                                                                  PSB-E-00-A5-DW-031 
-       Warehouse & Workshop     : Refer to PSB-E-00-A5-DW-048/ 
  PSB-E-00-A5-DW-049/ PSB-E-00-A5-DW-050
-       Electrical Building               : Refer to   DBAC914300

c.   Water demand standard refer to table “Pemakaian air dingin minimum sesuai penggunaan gedung” (Appendix-2)

2)    Distribution of Potable Water Main Pipe Size
a.     Calculation Quantity of Plumbing Fixture :
-       Office Building-B               : Refer to PSB-E-00-A5-DW-030/                                                                  PSB-E-00-A5-DW-031 
-       Warehouse & Workshop     : Refer to PSB-E-00-A5-DW-048/ 
  PSB-E-00-A5-DW-049/ PSB-E-00-A5-DW-050 
-       Electrical Building               : Refer to   DBAC914300



b.     Calculation  total of fixture refer to water supply fixture unit table, UPC page 55 (Appendix-3)
c.     With chart  of Estimate Curve for Demand Load (Appendix-4), specify flow rate by entering Total of fixture unit in the chart
d.     With the chart of “Kerugian gesek dalam pipa PVC” (Appendix-5), specify pipe size by entering flow rate & max. velocity standard (2.4 ) (Appendix-9)

3)    Black and Waste Water Main Pipe Size
a.     Calculation Quantity of Plumbing Fixture :
-       Office Building-B               : Refer to PSB-E-00-A5-DW-030/                                                                  PSB-E-00-A5-DW-031 
-       Warehouse & Workshop     : Refer to PSB-E-00-A5-DW-048/ 
  PSB-E-00-A5-DW-049/ PSB-E-00-A5-DW-050 
-       Electrical Building               : Refer to   DBAC914300

b.     Calculation  total of Drainage Plumbing Fixture (DFU) refer to drainage fixture unit table, UPC page 62 (Appendix-7)
c.     With table of Maximum Unit Loading and Maximum Length of Drainage and Vent Piping (Appendix-8), enter the DFU pipe size using the limit of pipe slope 1%

4)    Capacity of Septic Tank
a.     Capacity of Septic Tank = no. of Population (person) x total of Black & waste water (liter/prsn/day) x retention time ( 1 day)
b.     no. of Population taken from total of occupant at potable water demand table (calculation sheet-1, Appendix-1)
c.     total of Black & waste water taken from potable water demand table (calculation sheet-1, Appendix-1)
Calculation Sheet detail are presented in Appendix-1

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