SWR Aerator a new Revolutionary Product from Ashirvad

Ashirvad Aerator - The Velocity Breaker

 Ashirvad Aerator - Multi Storey Sewer Drainage System

Planning a High Rise | Introducing SWR Aerator a new Revolutionary Product from Ashirvad |

The same will save you in cost and time including labour and separate line for Soil and Waste.

Ashirvad Aerator - The Velocity Breaker

 Ashirvad Aerator - Multi Storey Sewer Drainage System

The Ashirvad Aerator Multi-Storey Sewer Drainage System comprises 110mm uPVC pipe and fittings that eliminate the relief venting requirements of traditional drainage systems.

The Ashirvad Aerator - system is part of SWR drainage range and is specifically designed for multi-storey building applications.

Ashirvad Aerator                                                                 

The Ashirvad Aerator system is based on the principle invented in the early 50’s in Europe.

 by studying hydraulic and pneumatic characteristics of intermittent flows and simulations it was concluded that controlling the flow made a separate venting system redundant.

The Ashirvad Aerator system is the ideal DWV system for high-rise buildings.

2.1 The ASHIRVAD Aerator - working principle

The high velocity in the down pipe of a tall building creates a 'hydraulic prop'. Due to air resistance (larger at high velocities), the water closes off the entire diameter of the down pipe. This causes a substantial pressure difference in both a positive and a negative sense. The pressure difference causes the evacuating force or pull in the siphon.

In an Ashirvad Aerator soil and waste system for high-rise buildings, velocity is limited by breaking the fall on each storey.

This enables greater air flow by pressing the waste water to the side of the pipe and, consequently, making room for an open connection in the middle of the pipe. The pressure difference remains far within +/- 30 mm WK the down pipe remains in a single line.

With a standard connection on a down pipe, the incoming waste water flow from the storey and the flow in the down pipe affect or even block each other. In the ASHIRVAD Aerator soil and waste system for high-rise, the waste water from the storey is channelled through a separate ‘compartment’ in the Ashirvad aerator before flowing into the down pipe. The merging with the waste water from above-lying storeys occurs in a gradual manner. The continuously open connection to the down pipe keeps the pressure in balance and the pipe for the storey can extend over a greater length without any secondary vents.                                                                                                                                                                    

                                                                                          

2.2 Elements of the system

The Ashirvad Aerator soil and waste system for high-rise consists of the following elements:

Ashirvad Aerator on each floor it has 3 horizontal d1 = 110 mm and 3 horizontal d1 = 75 mm with Vertical Stack dia 110mm.

A stack made of standard ASHIRVAD pipe and fittings sized by fixture unit load.

A de-aerator assembly at the bottom of the stack to make a transition to the general sewerage drain possible.

Relief vent where the stack is offset over a distance greater than 45°.

Ashirvad Aerator soil and waste systems for high-rise buildings have no height limitation, and sizing is determined solely on the number and type of fixtures connected.

The Ashirvad Aerator – The Velocity Breaker system:

• Slows the downward flow of water to prevent the formation of hydraulic plugs.

• Prevents waste water from branch lines mixing with other waste water until below the junction point.

• Has only one outlet pipe, replacing the need for a conventional two-pipe fully-vented or a fully ventilated modified stack system for multi-storey buildings.

• Provides significant cost savings through reduced pipe work and associated construction increasing flexibility for architects and designers of multi-storey buildings.

3.1 Designing the ASHIRVAD Aerator system

An Ashirvad Aerator soil and waste system for high-rise doesn't have any height restrictions: the dimensions are only determined by the number and types of drain fixtures that are connected to it. The Ashirvad Aerator system is preferably always equipped with one Aerator for each floor.

Follow the guidelines in this chapter in order to design the ASHIRVAD Aerator system for high-rise detailed calculations and examples of such designs can be found below.

The vertical and horizontal pipes have to be designed in accordance with the EN12056-2 which includes the dimensioning diameter and the maximum length of the branch (horizontal).

The basic ASHIRVAD Aerator system for high-rise consists of the following elements:

- ASHIRVAD Aerator on every floor

- A down pipe with standard Ashirvad pipes and fittings

- A vent pipe through the roof of the same diameter as the down pipe

- A vent pipe at the base of the stack

Ashirvad aerator in the down pipe

An Ashirvad Aerator down pipe aerator fitting must be installed on each storey where there are connections to the discharge stack.

 When the distance between two Ashirvad down pipe aerators is larger than 6 m, a double offset must be placed in the down pipe.

Zone division for each Ashirvad Aerator down pipe

If the building design requires more than one down pipe or the maximum capacity of a single down pipe will be exceeded, the storeys must then be divided into zones, each draining into different Ashirvad Aerator down pipes.

Deflecting the Ashirvad Aerator down pipe      

The axis of an Aerator down pipe can be deflected without use of an equalisation pipe if the transition is constructed as shown in illustration         

The angle of the offset must be 45° or less and the length of the offset pipe shorter than 1, 5 m. No joint can be installed closer than 0, 5 m above the offset and 1, 0 beneath it.

If the axis of the Aerator down pipe can't be deflected in accordance with the illustration, the offset must be equipped with an equalisation line, to be designed in accordance with reference to below image.

Connecting to the branch line

The maximum length for an unvented floor connector (or collector pipe) is 4 m at an incline of at least 1, 0% (1:100) with no more than three 90° bends. The floor connector must be sized in accordance to national standards and guidelines.

Floor connectors that exceed these limits must have connections to the down pipe involving secondary pressure-relief pipes (vents). The joint of the relief pipe to the down pipe must be slanted downward at 45°, as shown in below illustration                                              

>4m

    

     

max .permitted numbers DU	largest Single           DU	Branch Vent Pipe	Pipe Diameter
2.0	0.5	50	50
3.0*	1.0	50	63
4.5	1.5	50	75
9.0**	2.0	50	90
25.0	2.5	50***	110

* Maximum 2 Fixtures 0.8DU

**Maximum 2 WC a 2.0 DU (Dual Flush)

*** Up to 25 DU the diameter of the branch vent pipe is 50 (if DU > 25 the branch vent pipe diameter is 63.

Connectors are pipes that link a single drain fixture to the floor connector. According to EN 12056-2, the maximum length of an unvented connector is 3, 5 m (without any specification of slope or number of 90° bends). If the 3, 5 m is exceeded, the connector must be provided with secondary pressure relief as illustrated above.

All toilets must be connected to the Aerator down pipe aerator using a 110 mm pipe. Directly opposing connections on the Aerator are not permitted.

Recommended discharge pipe

According to EN 12056-2 the following branch discharge pipe without secondary vent system is recommended.

max .permitted numbers DU	largest Single          DU	Pipe Diameter
1.0	0.5	50
2.0	1.5	63
3.0	2.0	75
6.5	2.5	90
15.0	3.0	110

  According to EN – 12056 -2 the following branch discharge pipe with secondary vent system is recommended.

End of the Ashirvad Aerator down pipe

At the bottom of the Aerator down pipe, there must be an equalisation line in order to release all the built-up pressure. Fixtures can be attached to the equalisation line outside the joint-free zones. This equalisation pipe must be designed in accordance with illustration pic.

Connection at the base of the stack

If collectors have to be connected at this point, these connections can be made on the equalisation pipe, which is also called a diverter. There are also joint-free zones on the diverter pipe as indicated in images.

The equalisation or diverter pipe must have the same diameter as the down pipe showed in images.

Venting the Ashirvad Aerator down pipe

The diameter of the down pipe must remain the same without reduction until roof level is cleared. Exceptions to this rule involve the construction of multiple down pipes with a combined pressure-relief pipe. The pressure-relief pipes may be joined together beyond a point 1 m above the highest joint. For the Ashirvad Aerator system, this is only permitted if the internal surface area of the combined pressure-relief line is equal to or larger than the sum of the internal surface areas of the individual pressure-relief lines.

The maximum number of combined down pipes is 8 x 110 mm as long as the combined pressure-relief pipe has a diameter as specified in  below table provides an example of 4 down pipes ø 110 mm with combined vent pipes.

200mm

 

160mm

110mm

 

Minimum ø of combined pressure- relief pipe
Downpipe (n)	Ashirvad Aerator 110mm
1	110
2	160
3	200
4	250
5	250
6	315
7	315
8	315

250mm

_250m

110mm

110mm

110mm

110mm

                                                                

The flow opening must be at least equal to the surface area of the connected pressure-relief pipe. The position of the opening for the roof duct on the roof must be designed in accordance with national standards and guidelines, so that moisture and waste material is not allowed to enter.

From down pipe to underground pipe

One or more down pipes may be connected to an underground pipe provided that the capacity of the underground pipe is great enough. The maximum capacity of an underground pipe is described in EN 12056-2, and depends on the diameter and incline. The total drainage flow is the simultaneous flow from all connected drain fixtures. The relevant calculation for an underground pipe will be performed.

4 Ashirvad Aerator System Calculations

The basic calculation for an Ashirvad Aerator system involves determining the number of required down pipes and their diameter(s). For this purpose, the (composite) drainage flow for the collector pipes on the storeys must be compared to the maximum permissible capacity of the down pipe into which the Ashirvad aerator is incorporated.

Basic drainage unit Qi

The basic drainage unit (Qi) of each drain fixture that can be connected to a collector pipe is expressed in l/s and one Q equals 1 l/s. below table indicates a few devices with the basic drain values according to the standard.

                            

Table Qi according to EN 12056

Simultaneity coefficient

Not every drain fixture will be used at the same time and, therefore, the simultaneity coefficient p exists to take this factor into account. This coefficient will differ for each type of building (see below table).

Type of building	P
Residential and Similar	0.5
Detention, health care and lodging	0.7
Office, education and retail	0.7
Other uses	0.7
Sport and meeting	1.0

Table 1.5 Simultaneity coefficient

The simultaneity coefficient is employed in the equation to combine the drainage from all drain fixtures into a comparable drainage flow.

Combined drainage equation (l/s)

Equation Combined drainage equation (l/s)

Qa = Combined simultaneous drainage (l/s)

p = Simultaneity coefficient as indicated in table ((l/s)0,5)

n = Number of drain fixtures ( - )

Qi = Basic drainage unit for drain fixture i as stated in table 1.4 (l/s)

In this equation, the element  is the combined simultaneous drainage (every drain fixture being used simultaneously).

Ashirvad Aerator capacity

This combined simultaneous drainage (Qa) must be handled by one or more Aerator down pipes. Every down pipe incorporating the Ashirvad aerator has a maximum capacity based on diameter.  Below Table provides a summary of this.

Ashirvad aerator type                                                                            110 mm        160 mm

Maximum simultaneous drainage for Aerator                                      7 l/s               ....... l/s

Number of basic drainage units (Qi)*                                                    195 l/s           ........ l/s

The last row in the above table shows the permitted number of basic drainage units for the down pipe. The number is calculated by re-writing equation and by inserting the maximum capacity of the Ashirvad aerator from above table as Qa.

Sample Calculations

Number	Drainage Component	Qi
1	WC 6 Ltr Flush	2.0
1	Wash basin	0.5
1	Shower Area	0.6
Total per Floor		3.1
Total for 40 Floors		124

Residential building with 40 floors                                                                     

One Toilet per floor

Calculation of the discharge unit rating (Qi):        

 Flow rate of the building: Qf = p∗√∑ Qi              

 Qf = 0.5∗√∑ 124

Qf= 0.5∗11.13

Qf= 5.56 l/s

Result: Qf 5.56 l/s is less than Qa 7 l/s is the maximum flow rate for Ashirvad Aerator  

One Aerator per Floor is sufficient for the 40 floors when only with one Toilet per stack is connected to the system.  

Sample calculation for selecting the underground pipe or the collector pipe with a filling

Level of 50%.

A high – rise building is usually equipped with several stacks, which are combined into a collector pipe.

The dimension of the pipe is calculated in the following way.

Start of Calculation:

1.     Building with three Aerator Stacks

2.     Different stack flow rates

3.     Filling degree of the underground pipe or collector pipe 50%.

Calculation of the waste water flow rate for the individual sections:      

∑QiA=180

∑QiB=150

∑QiC=110

 

Section 1 = K* ∑Qi A

               = 0.5*180   = 6.7 l/s

Section 2 = K*∑Qi A + ∑Qi B

                = 0.5*180 +150

                = 0.5 * √ 330

                = 9.1 l/s

Section 3 = K* ∑Qi A + ∑Qi B + ∑Qi C

                = 0.5*180 + 150 + 110

                = 0.5* √ 440

                = 10.5 l/s

According to the dimension table of the EN regulation, the resulting collector pipe has a dimension of DN Ø = 160 mm

Underground pipe or the collector pipe

Calculation of pipe dimensions for sections 1–3:

(Table acc. to EN 12056-2: Maximal flow rate for underground pipes or collector pipes; with a filling degree of 50%)

Slope									Maximum Flow Rate Qi in l/s
Pipe	(1:100)	(1:66)	(1:50)	(1:40)	(1:33)	(1:28)	(1:25)	(1:20)
ø	1%	1.5%	2%	2.50%	3%	3.50%	4%	5%
110	2.5	3.1	3.5	4.0	4.4	4.70	5.00	5.6
125	4.1	5.0	5.7	6.4	7.1	7.60	8.2	9.1
160	7.7	9.4	10.9	12.2	13.3	14.4	15.4	17.2
200	14.2	17.4	20.1	22.5	24.7	26.6	28.5	31.9
250	26.9	32.9	38.1	42.6	46.7	50.4	53.9	60.3
315	48.3	59.2	68.4	76.6	83.9	90.7	96.6	108.4

6. Advantages of the Ashirvad Aerator system

Ashirvad Aerator soil and waste systems for high-rise offer the following advantages:

Ø  Saving space that can be used for other installations or as usable space for the occupants of the building

Ø  Higher flow capacity of the stack

Ø  Less installed cost by a plastic pipe (uPVC - SWR) pipe system with low weight

Ø  Reduced hydraulic pressure

Ø  Full peace of mind from a sophisticated risk management system

Ø  Eliminates the relief venting requirements of traditional SWR system.

Ø  Provides significant cost savings through reduced pipe work and associated construction.

Ø  Increases flexibility for architects and designers of multi-storey buildings.

Ø  As vent pipe structure is eliminated, a smaller shaft can be designed.

Ø  Provides multiple connection possibilities with single fitting at any floor level. (Adding other extension floors if needed)   

Ø  Product is recyclable

Ø  Reverse compatibility with traditional SWR

Ø  Reduces exit speed of SWR thus extending life of system

Ø  Reduces Noise

Ø  No Maintenance / Service required

Ø  Eliminates foul smell

Ø  Availability in Push fit / Solfit

Ø  Availability in SWR/Silent

Ø  UV Stabilized

Ø  Need only 1 Vertical Exit for relief /venting

Ø  Single pipe Dia for whole system gives many advantages

 6.1 Distinctive Features

• A single pipe stack, eliminating all additional pipe work required for relief venting

• Increased design flexibility with longer unvented branch drains, to a maximum of up to 10 metres

• Space-saving through the elimination of bulkheads

• Installation and construction cost savings through the elimination of venting pipe work.

Ashirvad Aerator System (A)	Traditional stack with vent pipe (B)
Single stack system	Two stacks
No limits in height	Limited in height
One diameter and limited number of fittings	More dimensions and of fittings
Multiple connections per floor*	One connection per floor
Low speed	High speed

       * The Ashirvad aerator has 3 connections d1 = 110 mm and connections d1 = 75 mm.