24 PROJECT
1 to a 160-diameter drainpipe hung from the soffit of the slab . The main 160 diameter pipe drops down to Parking level 5 and connects to the municipal sewer connection provided by the Civil Engineer .
Rodding eyes were installed at the recommended intervals and junctions i . e ., every 25m or at a change of direction of more than 45 degrees . Inspection eyes were installed at every junction .
Each stack has its own individual 110 diameter vent , combined under certain circumstances , at the top of the stack at its exit point on the roof . Vents open to the atmosphere were enclosed in weatherproof enclosure .
2
A 27kL sump is in the tank room in the event of overflow or draining from any of the tanks . All tank drainage and overflow piping to be in galvanised steel . Lifting station Grundfos pumps are controlled to stop / start at different water levels via ball float valves .
Typical gradient of 110 diameter waste pipes is no less than 1.60 and for 160 diameter pipes no less than 1.150 .
Cold water reticulation Sprinkler tank , domestic & hose reel / hydrant cold water storage tanks , hot water storage tanks are located on Parking level 1 in the tank room . Two 10 000 litre cold water tanks are located on the roof . Only cold-water piping was taken to the restaurant ablutions and kitchen with a PRV and metering valve . The plumber appointed by the restaurant owner will install the internal plumbing .
3
The Plumber connected from main supply to the plumbing / sprinkler ICV chamber on parking level 6 where a pressure reducing chamber was installed for domestic purposes .
The pressure reducing chamber consists of a valve , strainer , PRV , water meter and another valve . A bypass pipe was installed with a valve for maintenance purposes .
4
Water will be supplied from a 90 cubic metre combined domestic water and hose reel / hydrant sectional steel tank with two internal sub-divisions located in the tank room on Parking level 1 , using a Grundfos vertical multistage booster pump set complete with expansion tank . The domestic water portion of the main tank is reserved on the left side of the tank and equates to approx . 18 cubic metres in total . Water will be pumped to two 15 cubic metres sectional tanks located on the roof .
All photos by © Plumbing Africa Rory Macnamara
The two roof tanks are then connected to another Grundfos vertical multistage booster pump set complete with expansion tanks and VSDs ( variable speed drive ) to supply hot and cold water to each floor of the building . All horizontal pipes are installed with expansion loops as are all vertical pipes .
1 . |
Back – Building supply pumps . |
Front – Roof tank booster pumps |
2 . |
Boiler to hot water tanks pipe . |
3 . |
Expansion vessels |
4 . |
Sprinkler storage tank . |
www . plumbingafrica . co . za @ plumbingonline @ plumbingonline @ PlumbingAfricaOnline May 2022 Volume 28 I Number 3