Hydraulic calculation of internal plumbing network
∑H=18.12
Note: On the sites 3-4 and 11-12 pressure looses in water counters aren’t taken into account.
Calculation of water meters
Select the counters so that their nominal expences qw answered 4% average cost per day of maximum water consumption that are equal:
• for
building in whole
• for
separate flat
According to Annex 7 select water counters: for general water measuring node-BK-32, the hydraulic characteristics of waters counter S= 1.3 msec2/ l2; for apartments - BK-15, the hydraulic characteristics of the water meter S= 1.3 msec2/ l2.
Pressure loss in the water meter:
• in
general
• in
appartment
where
0.27 - estimated costs of water in a separate apartment (see Table.
3.8, section 3-4).
Defining the desired pressure
,
where
(annex 2,
СНиП).
Guaranteed pressure is more than desired pressure by 0.38 m (40-39,62), that ensures water supply to all water gathering devices under normal conditions.
Sewerage system
In building is designed economically-domestic sewerage for removing of contaminated sewer water from sinks, baths, sinks and toilets that are installed in each apartment. System of sawerage that is designed consists from the internal and the yard networks and sanitary-technical devices.
Yard network is design from cast iron pipes (ГОСТ 6942.1-80), because it is located above the plumbing and crosses it in two places (Figure 3.72). Yard network is connected to the street network in sewerage wells number 4. Before the red line of building it’s designed control well (№ 3).
Internal sewer network is designed with cast iron tubes and fason parts (ГОСТ 6942.1-30-80). In the building it is taken 8 sewer pipes. In the posts at a height of 1 m from the floor are installed revisions of the ground, last and after two floors. At issues and outlet pipe, where the contaminations are possible the cleaners are installed. Exhaust part of the post is removedobove the roof on 0.3-0.5 m (Figure 3.71).
Calculation of internal sewarage
Sewage system is designed by the method as specified in the SNiP 2.04.01-85.
The seconds expends of water in building:
where
(annex
3 СНИП).
Calculation costs of sewer water per seconds at he house on a whole:
where
-
expands of sewer water by device with the largest water removing
ability – urina (annex 2, СНИП).
Hours and daily expands in sewerage system are equal to expands in
water-supply system:
Where
Diameters and slopes of drainage pipes from sanitary instruments in residential building are accepted without calculation. The diameter of the exhaust pipes from the toilet bowls are accepted as 100 mm, from the rest of the devices - 50 mm. We design the slope of drainage pipes in side of riser (for d = 100 mm and i = 0.02; d=50;i=0.03) Diameters of sewer risers we determine by the Table 8 Building Norms and Rules 2.04.01-85, depending on the magnitude of calculation expenses of wastewaters and the largest diameter of the pipeline. Sewer risers are accepted the same diameter on all height. Calculation consumptions near base of riser are determined by formula (3.17) at the amount of devices, which are connected to this riser. The calculations of sewer risers we carry in view of Table 3.9.
Table 3.9.