Dura Pipe Presentation

8/8/2019 Dura Pipe Presentation

1/41

Drainage DesignThe Edge Manchester


2/41

Agenda

Limitations of the Primary Vented Stack

Design of Soil and Waste Systems

Other Design Criteria


3/41

Soil and Waste System Types

System I - Single stack system with partly filled branch discharge pipes

-Sanitary appliances are connected to partly filled branch discharge pipes are designedwith a filling degree of 0.5 (50%) and are connected to a single discharge stack. Basedon German Swiss Austrian practice

System II - Single discharge stack with small bore discharge branch pipes

-Sanitary appliances are connected to small discharge pipes. The small bore discharge

pipes are designed with a filling degree of 0.7 (70%) and are connected to a singledischarge stack. Based on Scandinavian practice

System III - Single stack system with full bore branch discharge pipes

-Sanitary appliances are connected to full bore discharge pipes. The full bore branchdischarge pipes are designed with a filling degree of 1.0 (100%) and each branchdischarge pipe is separately connected to a single discharge stack. Based on UK

practice

System IV - Separate discharge stack system

-Drainage systems type I,II,III,may also be divided into black water stack serving WCsand urinals and a grey water stack serving other appliances Based on French practice


4/41

There are four main areas of design criteria:-

SIZE - pipes will be large enough to carry anticipateddischarge

AIRTIGHT & WATERTIGHT - foul air must be excludedfrom entering the building. Leakage must be prevented.

GRADIENT - a fall is to be provided on all pipes.

ACCESS - to be provided for:

-Testing

-Maintenance

Design Criteria


5/41

Design Criteria

Sufficient access should be provided to enable all pipework tobe tested and maintained

Access covers, caps etc should be sited to facilitate theinsertion of testing equipment and the use of cleaning equipmentand /or for the removal of blockages

Use of equipment should not be impeded by the structure orother services

Access points should not be located where they will give rise tonuisance or danger if spillage occurs

Fit access above spill level and extend to the face of a duct orfloor level


6/41

Drainage Design Including European Code BS EN

12056Sizing BS EN 12056

1. Using table 2select thetotal number

of appliancesrunning in tothe stack

2. Add up thedishcargeunits DU for

theseappliances


7/41

Sizing

3. Select thefrequency factor

for the use of the

appliances using

table 3.

4. Work out the waste

water flow rate Qww


8/41

Sizing

5. Use the Qww (litres per second)to size the pipe using table 11.

We use swept entry fittings inthe UK but there is also acolumn for sizing square entry.

Table 12 is used if the soil andwaste system is to besecondary vented


9/41

Sizing Example

Congested eg. Football Stadium

50 number 6 litre WCs = 50x 1.7 = 85

100 number WHBs =100x 0.3 =30

Total Discharge Units = 115

The square root of 115 = 10.7

Frequency factor = 1.0

10.7 x 1.0 = 10.7

ThereforeTherefore a 150 mm stack is requireda 150 mm stack is required


10/41

Limitations of the Primary Vented Stack (PVS)

Design Guidelines for Branch Pipes (PVS)

Table 2 of the UK Building Regulation H shows clearly the diameters andlengths allowed for branch pipes in an primary vented system


11/41


Siphoning Traps

Self Siphonage Branch pipe fills up

causing an area of negative pressure to be leftbehind in the pipe. This negative pressure actson the trap once the basin has run emptycausing the trap level to fall.

Induced Siphonage Caused when twoappliances are connected to the same branchpipe (typically bath and basin). The branch pipeconnected to the stack fills up and the waterflowing from the bath past the basin t sets up aventuri which causes negative pressure in thebasin pipe acting on the basin trap.


12/41


Solution to Siphoning Traps

Increase the pipe size immediately after the trap

Ensure the pipe length between end appliance and pipe is

less than 1.7m when the slope is less than 1.25 degrees

Use resealing or Anti-vacuum traps

Fit an air admittance valve (this has limitations)

Fully vent the system (the preferred and best solution)


13/41


Rules for Using Air Admittance Valves (AAV)

The head of the drain should always vent to atmosphere

A ratio of 9:1 max should be used

Not suitable over 5 storeys

Will only deal with negative pressure!

Should never be used outside


14/41


Offsets and Base of Stack Bends

Positive pressure is created within a soil and waste system

at offset areas and at base of stack bends.

AP

VS can dissipate this air surcharge in domestic and lightcommercial installations but heavy utilisation of this

installation could cause the traps to be blown

For base of stack bends strict rules govern the diameter of

the bend and connection distances from the bend to the first

appliance.


15/41


Base of Stack Bends

Dimension L

Up to 3 Floors 450mm

Up to 5 Floors 740mm

Above 5 Floors 1 Floor

Minimum radius r = 200mm

At least Double the Pipe Diameter


16/41

Other Design Guidelines

Control of Thermal Movement in Plastic Systems

Plastic systems in general shall expand and contract with a rise and fall in

ambient temperature.

This expansion, although minimal, should be allowed for in a plastic soil andwaste system.

Expansion is usually controlled using an expansion coupling which is

anchored to a floor or wall so that it cannot move. The pipe then expands or

contracts in to this fitting.

As a rule of thumb any pipe over 1 meter long should have an anchor point

and expansion coupling.

Expansion within a building should be fitted at each floor level, outside of the

hot area of the stack and for horizontal runs every 4 meters (for uPVC)


17/41

Review

Looked at the four systems that in theory we can design to in the UK.

Looked at the four relevant design criteria within BS EN 12056 for good soil and

waste drainage design:

-Size

-Access

-Gradient

-Air and Water Tight

Looked at the limitations of system 3 primary vented stack, with discharge

branches allowed to run 100% full.

Looked at how to equalise the positive and negative pressure fluctuations in a

primary vented stack by introducing the concept of secondary venting

Looked at other design criteria such as crossflow and control of thermal movement


18/41

SoundAttenuated

Drainage

System


19/41

What is Friaphon?

Purpose-designed plastic above ground soil & rainwater

stack system with in-built sound attenuating properties


20/41

What is Friaphon?

System Overview

Sizes 110mm & 160mm

Dual layer 5.5mm thick pipe

Thick walled moulded fittings

Rubber lined support & sliding

clips

Jointed with double

couplers/rubber ring joints

BS EN 1329 fittings for waste

pipe connection


21/41

Where is it used?

Anywhere noise is an issue!!

Apartments/MultiStorey Buildings

Hotels

Hospitals

Public Buildings/Libraries

Entertainment Venues

Restaurants

The Edge, Manchester


22/41

Why choose Friaphon?

Complies and exceeds world wide noise reduction standards

Significantly lower installed costs over cast iron, lagged PVC &

HDPE

Lightweight & easily installed by one operative High impact resistance

Temperature & chemical resistant bore

Fire rated B2 , Self extinguishing (DIN 4102)

Traditional rubber ring jointed


23/41

Friaphon - SoundAttenuation

Dual Technology Pipe

Two layers of plastic

inseparably bonded

ABS/ASA/PVC-U inner/PVC-U

mineral reinforced outer

Sound waves reflected along

boundary layers and absorbed

by the pipes mass

Guarantees excellent sound insulation!!


24/41


Fittings

Thick walled fittings achieve a

high sound insulation level

resulting from minor soundvibrations

Long & short cushioning

sections reduce noise from

directional changes



25/41


Double Coupler

Floating mounting provides

acoustic segregation between

pipe, coupler & pipe preventingtransmission of structure-borne

sound

Integral expansion

compensator



26/41


Support & Sliding Clips

Friaphon sound proofing,

rubber lined support & sliding

clips reduce the transmissionof structure-borne noise



27/41

World Wide Sound Proofing Standards - DIN

4109:10


28/41


Source: Fraunhofer Institute for

Construction Physics


29/41

Why choose Friaphon?

Fire resistance

B2, Self extinguishing

Temperature resistance Short periods to 950C

Continuously to 900C

Chemical resistant

Good chemical resistance

Corrosion resistant

Impact resistant

High impact resistance Space saving

No need for lagging


30/41

Major UK Projects

276 Apartments, The Edge,

Manchester

258 Apartments, The NV Building,

Manchester Beetham Tower, Liverpool

Carden Hall, Cheshire

Queen Elizabeth Hospital, Woolwich

Barnet General Hospital

Coventry University Library

Cowley Manor Hotel

University College Cork, Art Gallery


31/41

What is Friaphon?

Friaphon is

The sound alternative to

cast iron... The sound alternative to

lagged PVC & HDPE.

Friaphon guarantees excellent sound insulation!!


32/41

Akatherm HDPE DrainageSystem


33/41

Akatherm HDPE drainage

Above and below ground soil & wasteand rainwater system

Sizes

75mm-315mm

Tempered Pipe

5m lengths

Spigot fittings

Expansion/Access

Electrofusion couplers

Universal electrofusion control box


34/41

Akatherm HDPE drainage

Suitable for

Apartments

Hotels

Schools

Hospitals

Offices

Industrial


35/41

Properties and benefits of HDPE

Impact resistant

Elastic suitable for burying in concrete

Smooth internal wall

Weather resistant UV resistant

Non toxic environmentally friendly

Prefabrication

Lightweight


36/41

Jointing Techniques


37/41

Electrofusion


38/41

Electrofusion 75-315 mm

Universal welding unit

Colour coded cables


39/41

Buttwelding


40/41

Akatherm References

Beetham Tower, Manchester

River Place Apartments,Liverpool

Royal Mills, Manchester

Green Quarter, Manchester


41/41

Summary

Impact resistant material Damage resistant/Low repair costs

Easy electrofusion welding

No leaks/No problems Wide range of sizes 75-315mm

For above & below ground application

Lower installed cost vs. cast iron

50% installed cost savings!

Dura Pipe Presentation

Documents

Transcript of Dura Pipe Presentation