hot water calculation.pdf
TRANSCRIPT
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1. Introduction 3
2. Plumbing Water Services 4
2.1 Service Water 5
2.2 Potable Water 6
2.3 Water Supply Fixture Units (WSFU)s 7
2.4 Electric Water Heater 8
3. Drainage System 22
2
Table Of Contents
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1. Introduction
All plumbing works shall be designed in accordance with the project specifications together with the Uniform
Plumbing Code (UPC).
1.1 Project Specifications
S-B00-1340-012 - Design Specification For Process Buildings
S-B00-1340-101 - Building - General Requirement
S-B00-1340-301 - Specification For Plumbing And Piping For Buildings
Reference Drawings
V-3140-002-4-401-42 - Plumbing Plan & Details / Water Supply First Floor Zone 1 Layout
V-3140-002-4-402-42 - Plumbing Plan & Details / Water Supply First Floor Zone 2 Layout
V-3140-002-4-403-42 - Plumbing Plan & Details / Water Supply First Floor Zone 1 Details
V-3140-002-4-404-42 - Plumbing Plan & Details / Water Supply First Floor Zone 2 Details
V-3140-002-4-405-42 - Plumbing Plan & Details / Water Supply Second Floor Zone 1 Layout
V-3140-002-4-406-42 - Plumbing Plan & Details / Water Supply Second Floor Zone 2 Layout
V-3140-002-4-407-42 - Plumbing Plan & Details / Water Supply Second Floor Zone 1 Details
V-3140-002-4-408-42 - Plumbing Plan & Details / Water Supply Second Floor Zone 2 Details
V-3140-002-4-409-42 - Plumbing Plan & Details / Water Supply First Floor Zone 1 Isometric
V-3140-002-4-410-42 - Plumbing Plan & Details / Water Supply First Floor Zone 2 Isometric
V-3140-002-4-411-42 - Plumbing Plan & Details / Water Supply Second Floor Zone 1 Isometric
V-3140-002-4-412-42 - Plumbing Plan & Details / Water Supply Second Floor Zone 2 Isometric
V-3140-002-4-413-42 - Plumbing Plan & Details / Drainage System First Floor Zone 1 Layout
V-3140-002-4-414-42 - Plumbing Plan & Details / Drainage System First Floor Zone 2 Layout
V-3140-002-4-415-42 - Plumbing Plan & Details / Drainage System First Floor Zone 1 Details
V-3140-002-4-416-42 - Plumbing Plan & Details / Drainage System First Floor Zone 2 Details
V-3140-002-4-417-42 - Plumbing Plan & Details / Drainage System Second Floor Zone 1 Layout
V-3140-002-4-418-42 - Plumbing Plan & Details / Drainage System Second Floor Zone 2 Layout
V-3140-002-4-419-42 - Plumbing Plan & Details / Drainage System Second Floor Zone 1 Details
V-3140-002-4-420-42 - Plumbing Plan & Details / Drainage System Second Floor Zone 2 Details
V-3140-002-4-421-42 - Plumbing Plan & Details / Drainage System First Floor Zone 1 Isometric
V-3140-002-4-422-42 - Plumbing Plan & Details / Drainage System First Floor Zone 2 Isometric
V-3140-002-4-423-42 - Plumbing Plan & Details / Drainage System Second Floor Zone 1 Isometric
V-3140-002-4-424-42 - Plumbing Plan & Details / Drainage System Second Floor Zone 2 Isometric
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2. Plumbing Water Services
Potable Water and Service Water shall be supplied to Operations Centre
(BXK-02) Building.
The water supply fixture units (WSFU) method for sizing network within
(BXK-02) building shall be utilized, as per UPC, Table A-2.
The flow rates are calculated from UPC charts A-2 & A-3, based on the
WSFU for each part of the network.
A maximum velocity of 3.0 m/s is allowed as per A61 of UPC.
The flow requirement for AHU 02 humidifier is l/s.
The flow requirement for AHU 03 humidifier is l/s.
Service Water is provided only for flush valves of the water closets & bib taps.
All other fixtures are provided with Potable Water.
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2.1 Service Water - Into Mechanical/Electrical Room 2
The following can be noted for pressure limitations:
Minimum pressure at flush valve = 30 Psi (207 kPa)
Pressure losses in the network:
Minimum residual pressure = 207 kPa
Elevation Differnece = 30 kPa
System Pressure Loss
115m x 0.5 kPa/m (avg) x 1.5 = 86.25 kPa
TOTAL 323.25 kPa
With 10% Margin = 356 kPa
Thus minimum pressure required in the SW network shall be356 kPa (51.6 Psi)
Note: Pressure available is 5 bar (72.5 Psi).
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2.2 Potable Water - Into Mechanical/Electrical Room 2
The following can be noted for pressure limitations:
Minimum pressure at lavatory = 15 Psi (103 kPa)
Pressure losses in the network:
Minimum residual pressure = 103 kPa
Elevation Differnece = 15 kPa
System Pressure Loss
110m x 0.5 kPa/m (avg) x 1.5 = 82.5 kPa
TOTAL 200.50 kPa
With 10% Margin = 221 kPa
Thus minimum pressure required in the PW network shall be 221 kPa (32.1 Psi)
Note: Pressure available is 5 bar (72.5 Psi).
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2.3 Water Supply Fixture Units (WSFU)s
Table - 1 Incoming (Mechanical/Electrical Room 2)
WSFU/Fixture Total WSFU/Fixture HW* Total
Water Closet Western Type 4 5 20
Water Closet Eastern type 22 5 110
Lavatory 30 0.75** 0.75** 45
Janitors Sink 8 3 24
Kitchen Sink 5 1.125** 1.125** 67.5
Hand spray 26 2 52
Urinal 18 5 90
Humidifier 2 0.5 1
Hose Bibb* 2 2.5 3.5
Water Cooler 2 0.5 1
Total 247.5 166.5
* HBs total cold water fixture units = (1x2.5)+(1x1) = 3.5 as per table A-2 of UPC
Based on criteria of velocity and pressure limitations, the pipe work within
the building has been sized using charts A-3 of UPC.
* HW Stands For Hot Water
** Combined PW/HW Fixture Units (PW or HW WSFU is of the Total WSFU.)
As per charts A-3 of UPC:
Service Water (Mechanical/Electrical Room 2) = 247.5 WSFU = 6.342 l/s =40mm
Potable Water (Mechanical/Electrical Room 2) = 166.5 WSFU = 3.681 l/s = 40mm
Incoming (Mechanical/Electrical Room 2)
A 75mm (3" diameter) Service water pipe is required at the inlet to the building
and a 50mm (2" diameter) Potable water pipe is required at the inlet to the building
Both sizes are equal to the tie-in sizes.
7
FixturePWSW
Qty
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2.4 Electric Water Heater
Reference to ASHRAE Handbook-Applications, Chapter 49 for "Service
Water Heating" (Table 10, Hot water demand of various types of fixtures
and buildings).
The building is served by fourteen electric water heaters.
As shown on the layout drawings.
Hot water demand as per Table 3:
Table 3
Electric Water Heater 1 - Toilet Male 1
Lavatory 4
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 92 l/hr
Probable Maximum Demand = 92 x 0.3 = 27.6 l/hr = 0.00767 l/s
Take 27.6 l/hr as it is > 23 l/hr
Storage Capacity Required = 27.6 x 2 = 55.2 Litres.
Say 60 Litres
Heating Capacity (kW) = 4.2 x 0.00767 x (60-10) = 1.611 kW
Say 2 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 60 Litres (15.85 USG)
storage capacity and 2 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Male 1.
(Note: 3 kW electric water heater to be provided)
8
23 92
92
Hot Water Demand
(Litre/hr)Fixture Qty
Total Hot Water
(Litre/hr)
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Electric Water Heater 2 - Toilet Female 1
Hot water demand as per table 4:
Table 4 - Toilet Female 1
Lavatory 4
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 92 l/hr
Probable Maximum Demand = 92 x 0.3 = 27.6 l/hr = 0.00767 l/s
Take 27.6 l/hr as it is > 23 l/hr
Storage Capacity Required = 27.6 x 2 = 55.2 Litres.
Say 60 Litres
Heating Capacity (kW) = 4.2 x 0.00767 x (60-10) = 1.611 kW
Say 2 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 60 Litres (15.85 USG)
storage capacity and 2 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Female 1.
(Note: 3 kW electric water heater to be provided)
9
23 92
92
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 3 - Toilet Female 2
Hot water demand as per table 5:
Table 5 - Toilet Female 2
Lavatory 3
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 69 l/hr
Probable Maximum Demand = 69 x 0.3 = 20.7 l/hr = 0.00575 l/s
Take 23 l/hr as it is > 20.7 l/hr
Storage Capacity Required = 23 x 2 = 46 Litres.
Say 50 Litres
Heating Capacity (kW) = 4.2 x 0.00639 x (60-10) = 1.342 kW
Say 1.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 50 Litres (13.21 USG)
storage capacity and 1.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Female 2.
(Note: 3 kW electric water heater to be provided)
10
23 69
69
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 4 - Toilet Male 1
Hot water demand as per table 6:
Table 6 - Toilet Male 1
Lavatory 3
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 69 l/hr
Probable Maximum Demand = 69 x 0.3 = 20.7 l/hr = 0.00575 l/s
Take 23 l/hr as it is > 20.7 l/hr
Storage Capacity Required = 23 x 2 = 46 Litres.
Say 50 Litres
Heating Capacity (kW) = 4.2 x 0.00639 x (60-10) = 1.342 kW
Say 1.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 50 Litres (13.21 USG)
storage capacity and 1.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Male 1.
(Note: 3 kW electric water heater to be provided)
11
Total Hot Water
(Litre/hr)
23 69
69
Fixture QtyHot Water Demand
(Litre/hr)
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Electric Water Heater 5 - Pantry 1
Hot water demand as per table 7:
Table 7 - Pantry 1
Pantry Sink 1
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 38 l/hr
Probable Maximum Demand = 38 x 0.3 = 11.4 l/hr = 0.00317 l/s
Take 38 l/hr as it is > 11.4 l/hr
Storage Capacity Required = 38 x 2 = 76 Litres.
Say 80 Litres
Heating Capacity (kW) = 4.2 x 0.01056 x (60-10) = 2.218 kW
Say 2.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 80 Litres (21.13 USG)
storage capacity and 2.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Pantry 1.
(Note: 3 kW electric water heater to be provided)
12
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
38 38
38
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Electric Water Heater 6 - Pantry 2
Hot water demand as per table 8:
Table 8 - Pantry 2
Pantry Sink 1
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 38 l/hr
Probable Maximum Demand = 38 x 0.3 = 11.4 l/hr = 0.00317 l/s
Take 38 l/hr as it is > 11.4 l/hr
Storage Capacity Required = 38 x 2 = 76 Litres.
Say 80 Litres
Heating Capacity (kW) = 4.2 x 0.01056 x (60-10) = 2.218 kW
Say 2.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 80 Litres (21.13 USG)
storage capacity and 2.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Pantry 2.
(Note: 3 kW electric water heater to be provided)
13
38 38
38
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 7 - Second Floor Toilet Male 1
Hot water demand as per table 9:
Table 9 - Second Floor Toilet Male 1
Lavatory 4
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 92 l/hr
Probable Maximum Demand = 92 x 0.3 = 27.6 l/hr = 0.00767 l/s
Take 27.6 l/hr as it is > 23 l/hr
Storage Capacity Required = 27.6 x 2 = 55.2 Litres.
Say 60 Litres
Heating Capacity (kW) = 4.2 x 0.00767 x (60-10) = 1.611 kW
Say 2 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 60 Litres (15.85 USG)
storage capacity and 2 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Male 1.
(Note: 3 kW electric water heater to be provided)
14
23 92
92
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 8 - Second Floor Toilet Female 1
Hot water demand as per table 10:
Table 10 - Second Floor Toilet Female 1
Lavatory 4
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 92 l/hr
Probable Maximum Demand = 92 x 0.3 = 27.6 l/hr = 0.00767 l/s
Take 27.6 l/hr as it is > 23 l/hr
Storage Capacity Required = 27.6 x 2 = 55.2 Litres.
Say 60 Litres
Heating Capacity (kW) = 4.2 x 0.00767 x (60-10) = 1.611 kW
Say 2 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 60 Litres (15.85 USG)
storage capacity and 2 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Female 1.
(Note: 3 kW electric water heater to be provided)
15
23 92
92
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 9 - Second Floor Toilet Female 2
Hot water demand as per table 11:
Table 11 - Second Floor Toilet Female 2
Lavatory 3
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 69 l/hr
Probable Maximum Demand = 69 x 0.3 = 20.7 l/hr = 0.00575 l/s
Take 23 l/hr as it is > 20.7 l/hr
Storage Capacity Required = 23 x 2 = 46 Litres.
Say 50 Litres
Heating Capacity (kW) = 4.2 x 0.00639 x (60-10) = 1.342 kW
Say 1.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 50 Litres (13.21 USG)
storage capacity and 1.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Female 2.
(Note: 3 kW electric water heater to be provided)
16
23 69
69
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 10 - Second Floor Toilet Male 2
Hot water demand as per table 12:
Table 12 - Second Floor Toilet Male 2
Lavatory 3
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 69 l/hr
Probable Maximum Demand = 69 x 0.3 = 20.7 l/hr = 0.00575 l/s
Take 23 l/hr as it is > 20.7 l/hr
Storage Capacity Required = 23 x 2 = 46 Litres.
Say 50 Litres
Heating Capacity (kW) = 4.2 x 0.00639 x (60-10) = 1.342 kW
Say 1.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 50 Litres (13.21 USG)
storage capacity and 1.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Toilet Male 2.
(Note: 3 kW electric water heater to be provided)
17
23 69
69
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 11 - V.I.P Toilet
Hot water demand as per table 13:
Table 13 - V.I.P Toilet
Lavatory 2
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 46 l/hr
Probable Maximum Demand = 46 x 0.3 = 13.8 l/hr = 0.00383 l/s
Take 23 l/hr as it is > 13.8 l/hr
Storage Capacity Required = 23 x 2 = 46 Litres.
Say 50 Litres
Heating Capacity (kW) = 4.2 x 0.00639 x (60-10) = 1.342 kW
Say 1.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 50 Litres (13.21 USG)
storage capacity and 1.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the V.I.P Toilet.
(Note: 3 kW electric water heater to be provided)
18
23 46
46
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 12 - V.I.P Pantry
Hot water demand as per table 14:
Table 14 - V.I.P Pantry
Pantry Sink 1
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 38 l/hr
Probable Maximum Demand = 38 x 0.3 = 11.4 l/hr = 0.00317 l/s
Take 38 l/hr as it is > 11.4 l/hr
Storage Capacity Required = 38 x 2 = 76 Litres.
Say 80 Litres
Heating Capacity (kW) = 4.2 x 0.01056 x (60-10) = 2.218 kW
Say 2.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 80 Litres (21.13 USG)
storage capacity and 2.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the V.I.P Pantry.
(Note: 3 kW electric water heater to be provided)
19
38 38
38
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 13 -Pantry 1
Hot water demand as per table 15:
Table 15 - Pantry 1
Pantry Sink 1
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 38 l/hr
Probable Maximum Demand = 38 x 0.3 = 11.4 l/hr = 0.00317 l/s
Take 38 l/hr as it is > 11.4 l/hr
Storage Capacity Required = 38 x 2 = 76 Litres.
Say 80 Litres
Heating Capacity (kW) = 4.2 x 0.01056 x (60-10) = 2.218 kW
Say 2.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 80 Litres (21.13 USG)
storage capacity and 2.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Pantry 1.
(Note: 3 kW electric water heater to be provided)
20
38 38
38
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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Electric Water Heater 14 -Pantry 2
Hot water demand as per table 16:
Table 16 - Pantry 1
Pantry Sink 1
TOTAL
Demand Factor = 0.3
Storage Factor = 2
Maximum Possible Demand = 38 l/hr
Probable Maximum Demand = 38 x 0.3 = 11.4 l/hr = 0.00317 l/s
Take 38 l/hr as it is > 11.4 l/hr
Storage Capacity Required = 38 x 2 = 76 Litres.
Say 80 Litres
Heating Capacity (kW) = 4.2 x 0.01056 x (60-10) = 2.218 kW
Say 2.5 kW
(Based on T = 50C, incoming water supply 10C, outgoing water supply 60C.)
Therefore, an electrical water heater with minimum 80 Litres (21.13 USG)
storage capacity and 2.5 kW electric heating coil will be sufficient.
Accordingly, select water heater and install in the Pantry 2.
(Note: 3 kW electric water heater to be provided)
21
38 38
38
Fixture QtyHot Water Demand
(Litre/hr)
Total Hot Water
(Litre/hr)
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3.0 DRAINAGE SYSTEM.
The Drainage fixtures units (DFU) method for sizing the drainage and vent
system and shall be applied as per UPC table 7.3.
Tables 7.5 to 7.8 for (DFU) shall be used for sizing the sanitary sewer and
vent pipework at a slope of 2%.
Two floor drains shall be provided in the HVAC room, connected to a
100mm drain and 50mm dia vent pipe.
Condensate drains from AHUs discharge into floor drains FD through a 50mm dia pipe
with a drain trap & funnel arrangement.
Drainage fixtures units assigned for each fixture is shown in table 2
DFUs and pipe sizes are shown on the drawings
BXK-02 Drainage
Discharge pipes from Water closets and floor gullies discharge to the below slab
drainage system via 100mm dia drain pipe, wall hung lavatory basins & sinks discharge to the
below slab drainage via 50mmdia drain pipe.
Table 2 - Drainage Fixture Units
WWC Water Closet Western 6 22 132
EWC Water Closet Eastern 6 4 24
LAV Wall hung Lavatory 1 30 30
JS Janitor Sink 2 8 16
FD Floor Drain 4 53 212
UR Urinal 2 18 36
KS Kitchen Sink 2 5 10
DF Drinking Fountain 0.5 2 1
Total 461
As per Table 7-4 of Uniform Plumbing Code,
the drainage pipe minimum size for 461 units that incorporates a WWC is 100mm dia.
The vent pipe size is 75mm dia.
Mechanical / Electrical Room 1
Reference FixtureDrainage
Fixture Units
Quantity of
Fixtures
Total Drainage
Fixture Units
FD Floor Drain 4 5 20
Total 20
A 100mm dia pipe shall be provided from the Mechanical / Electrical Room 1 discharging
22
Quantity of
Fixtures
Total Drainage
Fixture units
into the sanitary sewer manhole to the sanitary sewer line.
Reference FixtureDrainage
Fixture Units
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Mechanical / Electrical Room 2
Reference FixtureDrainage
Fixture Units
Quantity of
Fixtures
Total Drainage
Fixture Units
FD Floor Drain 4 3 12
Total 12
A 100mm dia pipe shall be provided from the Mechanical / Electrical Room 2 discharging
23
into the sanitary sewer manhole to the sanitary sewer line.