Agri Kultuur January / January 2018 - Page 24

to the fish tank . This difference in flow in the two directions gets controlled by two 25mm ball valves sitting either side of this T-Junction . On the DWC side , the pipe splits into a loop with two pips running the length of the canals and meet again at the end to close the loop . Building al loop is important for it balances the water pressure equally over the three outlets of the canals . Each outlet of the three outlets also has its own ball valve to shut down the flow for an individual canal to do maintenance . You probably noticed that the canals don ’ t have bottom drains ? It ’ s very simple , just pull the standpipes and the water will drain .
CONSTRUCTING THE LOOP : Looking at the diagram , “ Plumbing Layout ” previously you will see “ 20 %”. This is the position where your loop will start . The next steps will guide you construct your loop .
• Looking at the diagram , the approximate length of the loop is 2450mm & 1300mm . It is very ; very important to verify these distances on site before cutting these lengths of pipe for it might cost you to buy a whole six-meter length . It is strongly advisable to cut these lengths of FIRST before any other cuttings because the “ off cuts ” can be used to make up standpipes , short joints between components etc .
• Cut lengths of pipe :
• Two lengths of approximately 2450mm ( to be verified on site )
• Two lengths of approximately 1300mm ( to be verified on site )
• Best position to start is in the bottom right hand corner of the diagram ( IBC 2 ) where the loop makes a 90-degree turn .
• Install two , 25mm x 90˚ elbows into the two pair of lengths .
• Now we move to the top right-hand corner of the loop . Cut a 100mm piece of 25mm pipe and insert two 25mm x 90˚ elbows on each side of the 100m pipe . The openings of the two elbows must face the same direction .
• Insert the two lengths of 1300mm pipe into the sockets of the 25mm x 90˚ elbows
• Connect two , 25mm x 90˚ elbows on the other end of the two 1300mm lengths and now connect the two 2450mm lengths .
• The piping might become flimsy to handle
AgriKultuur | AgriCulture so it is advisable to tie the pluming to the cages with cable ties .
• On the top 2450mm length , insert a T-junction with the stem facing downwards .
• Insert a 100mm piece into the stem of the T-junction and now complete the loop by joining the 100mm pipe and the bottom 2450mm pipe with an elbow .
FITTING THE BALL VALVES :
• Cut in a T-junction into the top pipe lengths , 150mm from the IBC ’ s side in the positions as indicated on the plan . The stems of the T-junctions must face upwards .
• Insert a 30mm long piece of pipe into the stem and fit a 25mm ball valve with the tap handle facing outwards .
• Insert another 30mm piece of pipe on the other end of the ball valve and fit a 90˚ elbow facing towards the canal .
• Cut a 100mm piece of pipe and insert it into the elbow . Fit another elbow on the other side of the 100mm tube facing downwards .
• Cut a 250mm pipe and insert into the down facing elbow to complete the tap .
Plumbing the Water Pump :
The pump is situated in the biofilter which also serve as a sump . This is the lowest point to which water of the system drains and from here , the water gets pumped into the two directions ( fish tank and DWC ). Although the system only requires a circulation rate of 2900 litre per hour , the pump has the capacity to circulate 6000 litres of water per hour . The reason for an oversized pump is to cater for future expansion .
It is not a good idea to put strain on a pump by closing the relevant valves to get the desired flowrate throughout your system . Therefore , it is important to provide some form of relieve by installing a “ back pressure ” pipe to return the access water to the sump . Since the biofilter bacteria require dissolved oxygen ( DO ) for the nitrification process , it is advisable to fit a Venturi to this back-pressure pipe . A valve is also installed to control the flow of water . If you consider expanding your system at a later stage , the valve can be adjusted to provide additional flow of water when required .
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to the fish tank. This difference in flow in the two directions gets controlled by two 25mm ball valves sitting either side of this T-Junction. On the DWC side, the pipe splits into a loop with two pips running the length of the canals and meet again at the end to close the loop. Building al loop is important for it balances the water pressure equally over the three outlets of the canals. Each outlet of the three outlets also has its own ball valve to shut down the flow for an individual canal to do maintenance. You probably noticed that the canals don’t have bottom drains? It’s very simple, just pull the standpipes and the water will drain. so it is advisable to tie the pluming to the cages with cable ties. • On the top 2450mm length, insert a T-junction with the stem facing downwards. • Insert a 100mm piece into the stem of the T-junction and now complete the loop by joining the 100mm pipe and the bottom 2450mm pipe with an elbow. FITTING THE BALL VALVES: • Cut in a T-junction into the top pipe lengths, 150mm from the IBC’s side in the positions as indicated on the plan. The stems of the T-junctions must face upwards. • Insert a 30mm long piece of pipe into the stem and ЁյمٔݥѠѡх)݅ɑ̸)1ЁѡɅѡɽ᥵є)Ѡѡ̀)%Ёٕٕ́䁥хЁѼٕɥѡ͔)х́ͥєɔѥѡ͔)ѡ́ȁЁЁЁԁѼ)ݡͥ൵ѕȁѠ%Ё́ɽ)٥ͅѼЁѡ͔ѡ́%IMP)ɔ䁽ѡȁѥ͔́ѡq)ϊt͕Ѽх̰)͡Ё́ݕ́ь$%͕ЁѡȀѡ)ѡȁѡمٔЁ.h)܁ѽ݅ɑ́ѡ+$ Ё͕)ЁѼѡܸЁѡȁ܁)ѡѡȁͥѡՉ)ݹ݅ɑ̸+$ Ё͕ЁѼѡ)ݸ܁Ѽєѡх+$ Ёѡ́胊$Qݼѡ́ɽ᥵ѕѼ)ٕɥͥє$Qݼѡ́ɽ᥵ѕѼ)ٕɥͥє$ ЁͥѥѼхЁ́ѡѽɥ)ɹȁѡɅ% Ȥݡɔ)ѡ́ɕɸ$%хݼյ.h́Ѽѡ)ݼȁѡ̸Aյѡ]ѕȁAյ)Qյ́ͥՅѕѡѕȁݡ)ͼ͕ٔ́յQ́́ѡݕЁ)Ѽݡ݅ѕȁѡѕɅ́ɽ)ɔѡ݅ѕȁ́յѼѡݼ)ɕѥ̀͠х] ѡ՝ѡ)ѕɕեɕ́ɍձѥɅє)ɔȁȰѡյ́ѡѼ)ɍձєɕ́݅ѕȁȁȸQ)ɕͽȁٕͥ镐յ́Ѽѕȁ)ɔͥ+$9܁ݔٔѼѡѽɥеɹ)ѡ Ёյ)͕Ёݼյ.h́)ͥѡQ)ѡݼ́Ёѡͅ)ɕѥ$%͕Ёѡݼѡ́Ѽ)ѡͽ́ѡյ.h̃$ Ёݼյ.h́ѡ)ѡȁѡݼѡ́)܁Ёѡݼѡ̸$QЁѼ) =9MQIU Q%9Q!1==@)1ЁѡɅqAյ1ӊt)ɕ٥ͱԁݥ͕ptQ́́ѡ)ͥѥݡɔȁݥхиQ)ѕ́ݥեԁՍЁȁ+$)ɥ-ձȁɥ ձɔ)%Ё́ЁѼЁɅյ)ͥѡɕمЁمٕ́ѼЁѡͥɕ)Ʌєѡɽ՝ЁȁѕQɕɔ)Ё́хЁѼɽ٥ͽɴɕٔ)䁥хqɕɗtѼɕɸ)ѡ́݅ѕȁѼѡյMѡ)ѕȁѕɥɕեɔͽٕ坕(<ȁѡɥѥɽ̰Ё́٥ͅ)ѼЁYɤѼѡ́ɕɔ)مٔ́ͼхѼɽѡ܁)݅ѕȸ%ԁͥȁȁѕ)Ёѕȁхѡمٔѕ)Ѽɽ٥ѥ܁݅ѕȁݡ)ɕեɕ(