Tender No: GE12100645
Briefing Meeting: See details below or the tender documentation
Tender Closing Date: 2020-10-21 16:00
Required At: City of Cape Town
Tender Category: Civil, Road, Sewer, Plumbing and Engineering Supplies, Hydraulic and Pneumatic Tools and Equipment, Supply and Delivery Services
Tender Location: Cape Town, Western Cape
Tender Department/Company: City of Cape Town
RFQ TypeGoods Goods CIVIL, ROAD, SEWER, PLUMBING & ENG SUPPL Reference Number GE12100645 Title 25mm pvc air valve, pn16 Description 2 each x 25mm pvc air valve, pn16 Specification* specifications: combination air valve d-040 c 1" - cast iron shell and base (1" base - brass) materials and corrosion protection: the body is made of high-strength composite materials. All operating parts are made of specially selected, corrosion- resistant materials. D-040-c body is protected by a shell made of cast iron astm a48 cl.35b. Description the d-040 series combination air valve has the features of both an air release valve and an air <(>&<)> vacuum valve. The air release component is designed to automatically release small pockets of air to the atmosphere as they accumulate along a pipeline or piping system when it is full and operating under pressure. The air <(>&<)> vacuum component is designed to automatically discharge or admit large volumes of air during the filling or draining of a pipeline or piping system. This valve will open to relieve negative pressures whenever water column separation occurs. Applications - pump stations: after the pump and after the check valve. - downstream (after) and upstream (before) of shut-off valves. - after deep-well pumps. - on long constant-sloped pipeline segments. - at peaks along the pipeline and at peaks relative to hydraulic gradient. - at end lines. - before water meters. - on strainers and filters. D-040-c - additional applications - water pipelines vulnerable to vandalism and/or water theft. - water systems found in remote areas. Operation the air <(>&<)> vacuum component, with the large orifice, discharges air at high flow rates during the filling of the system and admits air into the system at high flow rates during its drainage and at water column separation. High velocity air will not blow the float shut. Water will lift the float, which seals the valve. At any time during system operation, should internal pressure of the system fall below atmospheric pressure, air will enter the system. The smooth discharge of air reduces pressure surges and other destructive phenomena. The intake of air in response to negative pressure protects the system from destructive vacuum conditions and prevents damage caused by water column separation. Air entry is essential to efficiently drain the system. The air release component releases entrapped air in pressurized systems. Without air valves, pockets of accumulated air may cause the following hydraulic disturbances: - restriction of effective flow due to a throttling effect as would as would a partially closed valve. In extreme cases this will cause complete flow stoppage. - obstruction of efficient hydraulic transmission due to air flow disturbances. - accelerate cavitation damages. - pressure transients and surges. - corrosion in pipes, fittings and accessories. - danger of a high-energy burst of compressed air. - inaccuracies in flow metering. As the system starts to fill, the valve functions according to the following stages: 1. Entrapped air in the pipeline is discharged by the valve. 2. Liquid enters the valve, lifting the float which pushes the sealing mechanism to its sealing position. 3. Entrapped air, which accumulates at peaks and along the system, rises to the top of the valve, which in turn displaces the liquid in the valve#s body. 4. The float descends, unsealing the rolling seal. The air release orifice opens and the accumulated air is released. 5. Liquid enters the valve and the float rises, pushing the rolling seal back to its sealing position. When internal pressure falls below atmospheric pressure (negative pressure): 1. The float will immediately drop down, opening the air <(>&<)> vacuum and air release orifices. 2. Air will enter the system. Main features - working pressure range: 0.2 - 16 bar - testing pressure: 25 bar. - maximum working temperature: 60 c. - maximum intermittent temperature: 90 c. - reliable operation reduces water hammer incidents. - dynamic design allows for high velocity air discharge while preventing premature closure. - lightweight, small dimensions, simple and reliable structure. - the drainage outlet enables removal of excess fluids. - the large size of the automatic air release orifice relative to the air valve body: # discharges air at high flow rates. # lessens the danger of its obstruction by debris. # enables the usage of the patented rolling seal mechanism, making it less sensitive to pressure differential than a direct float seal. - the body is made of high-strength composite materials and all operating parts are made of specially selected, corrosion- resistant materials. - due to its light weight, the valve may be installed on plastic piping systems, as well as other lightweight piping systems. - d-040-c the body is protected in a metal shell for anti-vandalism/ theft applications. Delivery Date2020/11/16 Delivery ToWater Services - E&AM MAINTENANCE PLANT Delivery Address1 Bluewaters close,, Simonstown Contact Person Daron.Green Telephone Number0217861554 Cell Number0843358144 Closing Date2020/10/21 Closing Time04:00 PM RFQ Submission Fax00000000000 RFQ Submission Fax 2 Buyer Email Address[email protected] Buyer DetailsP.Isaacs Buyer Phone0214006736 AttachmentsNo Attachments NOTE This commodity has gone on e-Procurement On 1 August 2018.No manual submissions will be accepted for this commodities.Suppliers will need must log in to e-Services portal to access RFQs.
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