SECTION 15406
SECTION 15406RAINWATER DISPOSAL INSTALLATION
PART 1 - GENERAL
1.01WORK INCLUDED
A. Contract Documents1. All work of this Section shall comply
with the requirements of the Contract Documents for the Main
Building works, with the Drawings, Schedules and with all other
Contract Documents.
B. Scope of Work
1.The Scope of Work of this Section shall include the design,
supply and installation of pipework and fittings at locations shown
on Drawings including the following areas:
a. Main Retail Building
b. Car Park Blocks
c. Planter Box drainage
d. Road/Driveway drainage
e. Drainage of Ventilation/exhaust ducts/access panels in
Basement
f. Overhead bridges
g. Toilet floor trap covers
2. The Contractor shall allow for connection of pipework to
existing drains
C. Related Works Specified Elsewhere
1.Related Work Specified Elsewherea. Pavior:Section 03700
b. Waterproofing & Insulation:Section 07100
c. Sheet Metal Roofing:Section 07610
D. Quality Assurance
1. Pipework installers shall have had a minimum of five years
experience in their trade.
2. All pipework and fittings supplied for this project shall
conform to the latest version of relevant British and American
Standards.
3. The pipework shall comply in accordance with the latest
versions of the following standards or other equivalent local
standard.
a. Rainwater and General Plumbing:
i)BS 21Specification for pipe threads for tubes and fittings
where pressure-tight joints are made on threads (metric
dimensions)
ii)BS 437Specification for cast iron spigot and socket
drainpipes and fittings.
iii)BS 460Specification for cast iron rainwater goods.
iv)BS 1091Specification for pressed steel gutters, rainwater
pipes, fittings and accessories.
v)BS 1184Specification, Copper and copper alloy traps.
vi)BS 1387Specification for screwed and socketed steel tubes and
tubular and for plain end steel tubes suitable for welding or for
screwing to BS21 pipe threads.
vii)BS 2494:Specification for elastomeric seals for joints in
pipework and pipelines.
viii)BS 2997Specification for aluminium rainwater goods.
ix)BS 3505Specification for unplasticised polyvinyl chloride
(PVC-U) pressure pipes for cold potable water
x)BS 4346 Joints and fittings for use with unplasticised PVC
pressue pipes.
xi)BS 4576Unplasticised polyvinyl chloride (PVC-U) rainwater
goods and accessories.
xii) BS 5481Specification for unplasticized PVC pipe and
fittings for gravity sewers
xiii)BS EN 545Ductile iron pipes, fittings, accessories and
their joints for water pipelines. Requirements and test
methods.
4.In the event of conflict between Standards, the more stringent
Standard will apply.
E. Submittals
1. Shop Drawings and manufacturer's data shall show plans,
elevations and sections of piping layout, and shall show locations
of pipe hangers, pipe guides, pipe anchors, and equipment to which
the piping connects.
2. Submit certifications that the pipework and fittings supplied
are in conformance with the standards set out hereunder.
3. Submit pipe joints, pipe support hangers, guides and anchor
details for approval.
4. Submit pipe testing and cleaning procedures for approval.
5. Submit complete testing report after testing and
commissioning.
PART 2 - PRODUCTS
2.01GENERAL REQUIREMENTS
A. Acceptable Manufacturers
1. Acceptable manufacturers, subject to compliance with
specified requirements. Other manufacturers providing similar and
equal product will also be given equal consideration:
a. Cast iron outlet with gravel stop and mushroom dome for
planter drainage outlet and cast iron outlet for roof drainage with
nickel bronze flat gratings at areas exposed to view, cast iron
dome gratings at non-visible areas and nickel bronze flat gratings
to floors drains (car parks and service corridors).
i) "Wade" International Ltd W-3000 Series and K Series.b.Upvc
Pipe
i)Ipex
ii)Creative Polymer Industries Pte Ltd
iii)Singa Plastic Ltd
v) Splendour Corporation Pte Ltd
Stainless steel floor drain outlet for toilets.
c."SMITH" USA, stainless steel finish or approved equivalent.
Selected models:
i) Model 9735- 8 Round adjustable top with solid scoriated cover
and closure plug. Rough finish stainless steel body, adjustable
top, secured scoriated cover and gasketed closure plug. Each
complete with stainless steel closure plug with test plug, and
flashing clamp with seepage holes.
B. Materials
1. All products delivered to site shall be new and properly
marked to identify the grade.
2. All pipe runs shall be installed generally in accordance with
the drawings but the Contractor shall include full allowance for
detailed scheme development.
3. Pipework shall be installed with correct falls to ensure
adequate venting and draining.
4. No welding is permitted on the pipework under any
circumstances whatsoever.
5. All pipes passing through the building expansion joints shall
be fixed with flexible connectors.
6. When pipework is embedded into the concrete structure all
pipework including joints shall be cleaned and tested for leakage
prior to the pouring of concrete.
7. UPVC pipework specification shall be in accordance with the
following tables.
Table 1 - Pipework SpecificationNominalBore (mm)Above
groundUndergroundHeavy Duty
100 150BS 3505BS EN 1456 BS 3505
200 and aboveBS 3505BS 5481BS3505,
Table 2 - Pipework JointsNominalBore (mm)Above
groundUndergroundHeavy Duty
100 200BS 3505BS EN 1456BS 4346
250 & above-BS 5481BS 4346
Table 3 - Maximum Support SpacingsNominalSupport Centre (m)
Bore (mm)VerticalHorizontal
1001.51.2
1501.51.2
250 and above1.21.0
Table 4 Pipe Dimension Table (above ground / Non-
pressure)Nominal Pipe Dia (mm)Min. Outside Dia (mm)Min. Wall
thickness (mm)Max. weight per m length (kg)
1001102.419
1501603.228
2002164.044
2502676.152
3003156.073
4004009.8120
Table 5 Pipe Dimension Table (underground) (equivalent to BS EN
1456 & BS 5481)
Nominal Pipe Dia (mm)Min. Outside Dia (mm)Min. Wall thickness
(mm) Max. weight per m length (kg)
1001103.218
1501604.036
2002004.955
2502506.185
3003157.7120
4004009.8150
Table 6 Pipe Dimension Table Heavy Duty (BS 3505:1986,
3506:1969)Nominal Pipe Dia (mm)Min. Outside Dia (mm)Min. Wall
thickness (mm) Class CMax. weight per m length (kg) Class CMin.
Wall thickness (mm) Class DMax. weight per m length (kg) Class
D
1001144.5136.018
1501686.624.58.840
2002187.84410.357.5
2502729.76812.889
30032311.59615.2125
PART 3 EXECUTION3.01 INSTALLATIONA. Pipe
Installation1.General:
a. Install piping parallel to columns and/or walls, clear of
obstructions, preserving headroom specified in all vehicular
traffic areas to comply with authorities' requirements and keeping
passageways clear.
b. Should structural difficulties or other work prevent running
of pipes or setting of equipment at locations indicated on
Drawings, necessary minor deviations will be allowed. The
Contractor shall inform the SC of these deviations, acceptance
shall be obtained from the SC prior to the work being carried
out.
c. Cut pipes in a neat and workman like manner without damage to
the pipes. Unless otherwise recommended by the manufacturer,
cutting shall be done with an accepted type of mechanical cutter.
Use wheel cutters where practicable. Ream pipe ends to remove
burrs.
d. As soon as pipes have been installed cover openings to
prevent extraneous materials causing obstructions. Leave covers in
place until removal is necessary for completion of
installation.
e. Attach supports only to structural framing members. Where
supports are required between structural framing members, provide
suitable intermediate metal framing.
f. Install piping with sufficient pitch to ensure adequate
drainage.
g. Support piping independently from all equipment so that
equipment is not stressed by piping weight or expansion.
h. All pipes shall be stored with closed ends, which shall not
be opened until erection. Every precaution shall be taken to clean
out piping before, during and after erection, and to prevent
foreign material being left in the pipe.
i. Where pipes pass through a building expansion joint and/or
are subjected to movement, approved flexible connections shall be
provided to eliminate any stresses whatsoever which might be caused
by such movement.
j. Where pipes are to be connected to existing fittings or
drains that were installed by previous Contractor, the Contractor
shall ensure that the pipes are compatible with the existing
fittings. Joints shall be spigot and socket joints.
k. All pipework shall be installed plumb, level or true to the
gradient, and shall be neatly grouped with the minimum number of
crossovers and adequate provision for venting, expansion,
contraction and movement. Pipework shall be substantially
supported. Adequate clearance shall be maintained from all other
services and from the building structure.
l. The Contractor shall check all declared invert levels before
laying any underground and embedded piping and shall notify the SC
immediately of any discrepancies.
m. All underground and embedded pipework shall be protected by
wrapping with hessian or other acceptable material and coated with
bitumen paint.
B. Pipe Hangers and Supports1.General:
a. All necessary hangers and supports, including rods, angles,
channels and plates, as well as any changes from indicated design,
shall have the SC's prior acceptance. All members of the hanger and
support system shall be fabricated from hot dipped galvanized
steel. Components such as washers, bolts, nuts, and the like shall
also be of hot dipped galvanized steel.
b. Vertical piping shall be guided or supported in the centre of
each riser, with approved steel brackets to prevent swaying,
sagging, vibration and resonances. Avoid strains that cause lines
to snake or buckle between supports or anchors.
c. Pipe hangers of same size or nearest manufactured size
available as pipe or tubing on which they are to be used shall be
provided.
d. Install a gasket between clamp and pipe of dissimilar
material.
e. No pipe support and hangers shall be mounted on any drywall
partitions.
2.Type of Devices:
1. Provide hangers and supports as illustrated on the drawings,
or as required in accordance to the manufacturer's instruction.
2. Secure hangers from concrete work to metal inserts cast
into/anchored to concrete. When these inserts are not available,
make attachment by one of the following as directed by the SC.
i)Anchor bolts set in place with fast setting high strength
grout.
ii)Controlled energy type power actuated fasteners.
3.Furnish anchors and guides for all horizontal and vertical
piping for proper control of thermal movement, to prevent
perforation of expansion joints and to avoid overloading of hangers
and supports.
C. Cleaning1. Exercise every precaution to avoid introducing
foreign matter into piping system. All piping and fittings shall be
internally cleaned of oil, grease or dirt, prior to assembly into
systems.
2. Following fabrication and erection, clean all piping 150mm
and smaller by flushing with clean water and run to waste until
thoroughly free of all dirt, oil and cuttings, and the like.
Generally, each size of pipe shall be flushed separately before
being jointed with larger size piping.
3. Clean piping 200mm and larger by pulling through fibre brush
or swab for entire length of each pipe size. Brushes and swabs are
to be slightly larger than inside diameter of pipe being
cleaned.
4. All cleaning operations, shall be continuous throughout
piping installation system, except at joints required for final
joining of various sections of cleaned piping. After cleaning and
until above final joints are made, end of sections of piping shall
be adequately and tightly sealed off to prevent any dirt, water or
other foreign matter from entering ends of pipe.
5. Cleaning of pipes shall occur at the end of each day and
immediately after the occurrence of rain.
D. Testing and Commissioning1. The Contractor shall carry out
all necessary testing and commissioning procedures in addition to
those called for elsewhere in this specification comprising tests
at manufacturer's works, site tests during construction,
commissioning and acceptance tests, all as specified below.
2. Testing and commissioning shall be carried out in accordance
with the appropriate British Standard or BS Code of Practice.3. All
tests shall be witnessed by the SC and shall be properly certified
in a manner to be agreed with the SC and four copies of all
certificates shall be issued to the SC on completion.
4. Provide 24 hours notice to the SC before testing.
5. Test records, certificates and performance curves shall be
supplied for all tests, whether or not they have been witnessed by
the SC. The information given on such test certificates and
services shall be sufficient to identify the material or equipment
to which the certificate refers.
6. These test records, certificates and performance curves shall
be supplied for all tests, whether or not they have been witnessed
by the SC. The information given on such test certificates and
services shall be sufficient to identify the material or equipment
to which the certificate refers.
7. Only when the installations have been so certified and all
test figures and other relevant information have been recorded in
the prescribed manner and accepted by the SC should the works be
considered fit for handing over to the Employer.
8. The tendered sum shall be deemed to have included all costs
associated with the above mentioned testing and commissioning
procedures including the cost of making good any defects arising
out of such tests and having the work retested. Such costs shall
also include for the provision of all instruments necessary for the
test.
9. The Contractor shall be responsible to supply all testing
equipment necessary for the testing and commissioning of the entire
system.
E. Test at Manufacturer's Work and On Site1. Manufacturer's
works test shall include all tests in accordance with the relevant
British or American Standards and in addition any tests called for
by the SC to ensure that the plant being supplied meets the
requirements of the specification. For material/equipment not
covered by any British Standard or specifically mentioned in this
specification the tests shall be agreed with the SC.
2. Supply and install all materials, supplies, labour and power
required for hydrostatically testing all piping. Make preliminary
tests and prove work satisfactory. Notify SC in ample time to be
present for final testing of all piping. Repair defects disclosed
by tests or, if required by SC, replace defective work with new
work without additional cost. Make tests in stages if so directed
by SC to facilitate work of others. Use of wicking in tightening
leaking joints is not permitted.
3. The Contractor is responsible for work of other trades
disturbed or damaged by tests and/or repair and replacement of his
work and shall cause work so disturbed or damaged to be restored to
its original condition at his own expense.
4. Supply and install all necessary testing junctions and bends
for all pipework, and seal off or remove them as directed by the
SC.
5. All trap seals shall be tested for stability by means of an
appropriate discharge test, under which every trap must maintain at
least 25mm water seal under three consecutive tests.
F. Preliminary Commissioning Checks1. The Contractor shall
ensure that all equipment included under this Contract is
thoroughly cleaned, lubricated and checked for serviceability
immediately before setting to work. Particular attention is drawn
to the removal of building debris from the pipework systems.
2. Attention is drawn to the need for thoroughly flushing out
all pipework systems to ensure that all foreign matter is
removed.
G. Commissioning1. When the various installations have been
completed (but before the issue of the Completion Certificate) and
the preliminary commissioning checks carried out, the Contractor
shall set to work and regulate the system in the entire
installation.
H. Final Acceptance Tests1. Following commissioning of the
entire installation, the Contractor shall carry out final
acceptance tests and prior to issue of the Performance Certificate
in accordance with a programme to be agreed with the SC.
2. Should the results of the acceptance tests show that the
pipework to perform to the performance figures as given in this
specification or as accepted in the Contractor's tender, the
Contractor shall adjust, modify and if necessary replace the system
without further payment in order that the required performance be
obtained. Should it be necessary for the Contractor to attend to
items of plant as above described, he will be responsible as to
cost for any damage or deterioration to the building or other
services consequent on such attendance.
I. Rejection of Plant
1. Any part of the system or pipework or component which fails
to comply with the requirements of this specification in any
respect whatsoever at any stage of manufacture, test, erection or
on completion at site may be rejected by the SC either in whole or
in part as he considers necessary. After adjustment or modification
if so directed by the SC, the Contractor shall submit the items for
further inspection and/or tests. Pipework or components with
defects of such a nature that the requirements of this
Specification cannot be fulfilled by adjustment or modification
shall be replaced by Contractor at his own expense.
PART 4 CONNECTION TO EXTERNAL DRAINAGE SYSTEM
A. Excavation and Backfiling1. Excavation for pipe trenches
shall not be less than 600mm wider than the internal diameter of
the pipes and the ground under pipe beds shall be carefully graded.
Proper necessary shoring, planking or strutting shall be
constructed and maintained to ensure that the trench will not
collapse.
2. Surplus excavation soil shall be removed from the site.
3. All excavations shall be kept free from water at all times by
pumping, bailing or temporary drainage.
4. In the event of the excavations being made deeper than
necessary they shall be filled to the proper level with lean
concrete.
5. Allowance shall be made for removing all rock or construction
debris met with in the course of excavation with picks, wedges,
levers and sledgehammers and compressor drills. No blasting will be
allowed.
6. Sleeve have been cast into the existing diaphragm walls. The
Contractor shall carry out any remedial works required to penetrate
the walls if the sleeves have been mis-aligned. The Contractor
shall waterproof the pipe penetrations through the wall to the
satisfaction of the Engineer.
7. Fill with selected materials, free from lumps exceeding 75mm
in size and from stones, and compact in layers not exceeding 150mm
in depth to a level of 300mm above the top of the pipes. The
remainder of the trench shall be backfilled to the surrounding
level with approved excavated material.
8. Trenches shall be left open for the inspection of the
Engineer and the Local Authority's inspector and shall not be
covered up until the drains have been properly tested and
approved.
B. Concreting Works1. The components of the reinforced concrete
shall be as follows :
a. Cement shall be of approved type and comply with BS 12. It
shall be fresh when delivered. Cement of different brands shall not
be mixed with one another. Cement which has set in the bag upon
opening, shall not be used.
b. Sand or fine aggregate shall be cleaned, graded natural sand.
Sand with coagulated lumps and having a portion of silt exceeding
10% shall be rejected.
c. Coarse aggregate shall be cleaned, crushed stone and shall be
free from dust, clay or other deleterious materials.
d. Water shall be that obtained from the supply mains and not
from excavation or drains.
e. Reinforcement used shall be hard-drawn steel wire BRC fabric
mesh complying with BS 1221 and BS 785 for mild steel rods. BRC
mesh and steel bars shall be free from rust or mill scale.
2. Concrete beds shall be 150mm thick and shall have at least
150mm width at each side of the external diameter of the pipe
barrels when laid. Unless otherwise specified, the concrete shall
be 1:2:4.3. For pipes to be haunched, the concrete shall be carried
up for the full width of the bed to the level of the horizontal
diameter of the pipe and shall be splayed from this level and
carried upwards to meet the pipe barrel tangentially.4. All pipe
work passing under driveways are to be surrounded with concrete
which shall be carried up from the bed in a square section with a
minimum of 150mm thickness over the barrel of the pipes.
C. Pipe Laying1. The pipe shall be laid singly with the whole
length of the barrel of each pipe on a solid bed. No pipes shall be
joined together before having been laid.
2. Where pipes are to be laid without concrete, joint holes
shall be formed in the bottom of the trench ahead of the work in
order that joints may be properly made. The joint holes shall be as
short as practicable.
3. Where pipes are to be concreted, the concrete shall be spread
over the floors of the trenches and headings to half the thickness
of the bed finally required. This concrete shall be brushed and
washed down with clean water immediately before pipe laying is
commenced. As each pipe is laid the barrel shall be lumped into a
dumpling of plastic concrete, to the correct line and level. After
the dumplings have been set and the joints have been made and
tested, the remainder of the concrete shall be placed and lumped
solid.
4. The socket shall face up the gradient. The spigot of each
pipe shall be well-driven home into the socket of the pipe
previously laid and the joint completed as specified and the bore
of the pipe cleared of any obstruction before the next pipe is
laid. Care shall be taken that there is no irregularity in the
invert of the joints.
5. The level of each pipe shall be tested by a straight edge
laid in the invert of the pipe previously laid and on the nearest
level peg. If the bottom of the trench has been taken too low, it
shall be made up with concrete or cement mortar.
6. Where it is required to shorten any pipe, it shall be cut off
square and cleanly, and cast iron pipes shall be cut only with
approved pipe-cutting machines.
7. In the event of any pipe being fractured from any cause
whatsoever after having been properly laid the pipe, in every
instance, shall be replaced to the satisfaction of the
Engineer.
8. Where laid in hardcore or fill, cast iron pipes subjected to
a superimposed load shall be supported from natural ground level
throughout their lengths by walls and haunching.
9. Where laid in hardcore or fill and not subjected to a
superimposed load, or where laid above ground, cast iron pipes
shall be supported on piers behind the socket of each pipe and at
intervals or not more than 2700mm.10. In soft or yielding ground
where there is permanent ground water and subject to the approval
of the Engineer, pipes shall be laid on "bakau" piles and a bed of
reinforced concrete 150mm thick. For tender purposes, based on
piles of 4.5m length at 300 centres of at least 75mm diameter, the
Contractor shall provide a unit rate estimate. The design of the
concrete bed, reinforcement and other details shall be to the
requirement of the Local Authority.
11. Piles laid through or under walls, shall be laid in such a
manner than the weight of the wall shall not bear on the pipes.
12. Pipes laid in injurious soil or materials shall be protected
as shown or as directed by the Engineer.
D. Existing Services Interference with Traffic an Adjoining
Properties1. The Contractor shall liaise with the relevant Service
Departments, for the location of all pipes, cables, mains, ducts,
posts, manholes, boxes, etc along beneath the road reserves or in
any other part of the work in order to ensure that all service
requirements are met before commencement of the work.
2. The Contractor shall apply to the Police Department and other
relevant authorities where necessary to procure all permits before
proceeding with the works.
3. The Contractor shall obtain up-to-date information or
drawings from the respective Authorities with regard to the
existence of other services along or beneath the road.
4. The Contractor shall be held responsible for any damage done
during the progress of works and shall meet all costs and repairs
and reinstatement due to such damage.
5. The Contractor shall notify the SC/Engineer and any relevant
authorities immediately of any existing services which will be
affected by the works and shall immediately provide adequate
supports and protection of same to the satisfaction of the
SC/Engineer at his own expense.
6. All operations necessary for the execution of the works shall
be carried out in such a manner so as not to interfere
unnecessarily or improperly with public convenience.
7. The Contractor shall, when required by the SC or by the
Authority, apply and operate suitable methods of traffic control at
his own expenses. If so required, flashing warning lights and
notice shall be displayed at the Contractor's expense.
E. Restoration of Surface1. The Contractor shall be responsible
and liable for the restoration of any apron or road paving bitumen
surfacing etc, or any turf removed or damaged as a result of
this.
2. Any aprons, roads, paths, and the like so affected shall be
restored with materials of the same nature and of equal quality as
those contained in the original pavement and to the same standard
of construction and the same depth so as to produce at the end of
the Maintenance period, a finished surface at least equal in all
respects to that existing before the commencement of the works
comprising this.
3. Should the Contractor fail to properly restore and maintain
surfaces affected by his operations, the SC shall have the
authority to employ others to make good the surfaces affected and
the cost of such labour, transport and materials employed shall be
paid for by the Contractor.
F. Connection to Existing Drains
1. Where indicated on the drawings the Contractor shall allow to
break into the existing street drains. The Contractor shall obtain
approval from the Local Authorities prior to the works.
2. The Contractor shall minimize the extent of demolition
required to allow the pipe to pass into the drain. The Contractor
shall install the pipe as indicated on the drawings.
3. The Contractor shall reinstate the drain to the approval of
Local Authorities.END OF SECTIONBurj Dubai Dubai Mall Hotel, Dubai,
United Arab Emirates
Rainwater Disposal Installation
MEP Spec-For Construction (Date of Issue: Jan 2006)
15406.2
