|Design specification||ANSI B16.34|
|Pressure rating (max)||20 bar working pressure|
|Valve configuration||Globe type|
Cooling Car Valve
The Cooling Car Valve System ensures a constant flow through a cooling car irrespective of the flow demand from downstream operations. The valve saves water and energy by only dumping water to drain when the demand from operations is less than the cooling car flow required. If the demand from operations is more than the cooling car flow requirement, the water will be directed back into the service water line.
- Stainless steel internals
- Cast steel body – galvanised
- High sealing integrity and dirt tolerance
- Flanges and face dimensions to customer specifications
- Flow totalizer may be attached to monitor savings
One open circuit cooling car consumes 6 ℓ/sec, then 6 x 4.333 weeks/month x 168 hrs/week x 3600 sec/hr = 15.74 Mega litres/month per cooling car
Flow to a production raise during a production period (5.5 days/week x 10 hrs/day) is more than 6 ℓ/sec. Hence, during the 55 hrs/week the cooling car valve will use production water and no water will be dumped to the drain from the cooling car.
Flow to production raise due to leaks during non-production period is 3 ℓ/sec for 168-55 = 113 hrs/week, i.e. off-production consumption rate is half production consumption rate.
Then, mean flow per cooling car
= (0 x 55 + 3 x 113) / 168 = 2.02 ℓ/sec or 5.3 Mega litres/month per cooling car.
= 15.7 – 5.3 = 10.45 Mega litres/month per cooling car or 10.45 / 15.74 = 66%
Pumping cost savings
For a 2000 m lift with dewatering pump-sets 70% efficient
Energy saving = 56 900 kWh/month per cooling car
At a mean Megaflex tariff of R0.937/ kWh (2016/2017 South African rates)
The electricity saving per year = 12 x 56 900 x 0.937 = R 639 783
Pump maintenance saving at 18% of electricity cost = R 115 161
TOTAL annual savings per cooling car = R 754 944
Electricity Tariffs in South Africa