PROJECT
45
<< Continued from page 43
PRODUCTS USED DURING THE PROJECT
“We proposed the usage of a PEX piping system for the
hot/cold/grey/rainwater systems, based on our desire for
a system with a good low-maintenance track record, as
well as removing any temptation of theft of any copper
or brass supplies from the project,” explains Clint Morck,
the wet services engineer from Delca Systems.
Geberit’s Mepla was agreed on by both engineer and
contractor (this is an NEC3 contract whereby both sides
of the contract are required to work in conjunction).
HDPE piping was specified for the outside of the
buildings, and for the greywater collector lines in B001.
“The supply of pumps was left to the contractor’s
decision — in accordance with the NEC3 contract,
based on our input/output requirements,” says Morck.
UNIQUE ASPECTS OF THE PROJECT
This project has two unique features: the greywater
system and the fire reticulation system. The greywater
system recycles water from basins, showers, and all the
washing machines. T he required flushing water volume
is then filtered and processed through a Biobox system.
This treated water is then pumped back into the different
buildings to the respective toilet cisterns.
All systems were designed using standard norms and
regulations, except for the greywater and rainwater
harvesting and supply, whereby header tanks on the
roofs of the buildings were supplied with either treated
greywater (B001/NBP001/NBP002) or irrigation supply
(NBP003 to NBP013). The greywater will be stored in
1 000-litre Jojo tanks, with their own 1kW pressure
pumps, and will only be used to flush toilets.
The hot water plant and reticulation for B001 were unique
in that it was decided to go with a centralised (heat pump
and pressure vessel storage) plant under Block D of the
formation, and ring feed the hot water to each of the six
buildings’ service ducts. As a result, the lengths of the
dead legs in the hot water supply were reduced.
BACKUP WATER SUPPLY
The university has their own supply reservoirs (3ML and
0.9ML) for backup water supply. “I am of the opinion that
this storage volume has been projected to handle a two-
day storage for the entire campus, once fully developed,
due to the bulk water supply having been designed by a
different engineer,” explains Morck.
FIRE RETICULATION AND
GREYWATER/RAINWATER SYSTEM
Morck explains that the fire reticulation was handled by a
separate fire consultant and is specific to each building,
all pulling any necessary supply from the bulk water line
through the campus. This draw (should there be no fires
in the next few years) will only impact the initial filling up
of the storage units.
1
1.
2.
3.
The cleaners’ pan.
Pot sink with a pull-out
sink hose in the hotel
school’s demo kitchen.
Granite handbasin at
the hotel school’s main
kitchen.
2
3
Continued on page 47 >>
www.plumbingafrica.co.za
June 2018 Volume 24 I Number 4