ReFlow(patent pending), an original idea developed by Renzo Chirulli and Manuel García Román (University of La Laguna, Tenerife – Spain), was selected to be between the three finalists of IWATER Idea Awards 2016, held in Barcelona, Spain on 15-17 November 2016.
ReFlow – Flow Enhancement, Rehabilitation and Cabling is a modular mold that allows to reshape existing sewer conduits, migrating from a traditional circular or egg-shaped cross section to an algebraic curve of degree higher than two (i.e. Bernoulli’s lemniscate or Huygens lemniscate). The resulting reshaped cross section significantly increments fluid velocity at the lowest flow rates. Low flow rates in sewage pipes cause sedimentation of solids and other problems derived from the lack of water aeration and generation of hydrogen sulfide, namely metal corrosion and concrete attack by sulfate. The new reshaped pipe invert is obtained by assembling several molds, manhole to manhole, in a continue string, before carrying out a trenchless relining operation (i.e. Cured In Place Pipe). The new liner, installed by a trenchless method, takes the shape resulting from the combination of the existing pipe and the ReFlow mold, as shown below.
ReFlow does not enhance merely hydraulic performances, it allows to construct several secondary conduits, obtained in the body of the mold string. The new conduits result to be parallel to the pipe axis and perfectly protected against the most common attacks (fluid dragging, mice, etc.). These secondary conduits can be used to install fiber optic cables, transforming the sewer main in a telecommunication infrastructure.
ReFlow is a simple and smart way to solve common problems due to low fluid velocity at low flow rates, such as sedimentation and hydrogen sulfide and for cabling a sewer main before rehabilitate it with the most popular trenchless methods.
ReFlow is a patent pending product.
We are looking for a strong industrial/commercial partner.
What I did: I made the detailed design of the replacement by dynamic pipe bursting of a DN600 (24″) sewer concrete pipe with a DN800 (32″) HDPE pipe; I coordinated all the geological/geotechnical preliminary survey and I also made the detailed design of the bursting-expanding head, tailored shaped to work with a Tracto Technik TAURUS rammer (24″). The expander has an outside diameter of 1000 mm. The soil was sand with coarse to very coarse gravel.
LARGE DIAMETER DYNAMIC PIPE BURSTING FOR SEWER REPLACEMENT
What I did: I made the detailed design of the rehabilitation, by thermal and UV CIPP, of DN1200 and DN1000 (48 and 40 in) sewer mains for a total length of 220m, at the Petrochemical Plant of Porto Marghera, Italy; detailed design of the rehabilitation, by thermal CIPP, of DN1200 (48″) sewer mains for a total length of 1.250 m, in the cities of Scafati, Pompei e Sant’Antonio Abate, Italy.
DESIGN OF THE REHABILITATION OF LARGE DIAMETER SEWER MAINS BY CIPP
What I did: I made the detailed design and project management of the rehabilitation, by UV-CIPP, of air-conditioning pipes DN350, laid under runways, at the international airport of Fiumicino Leonardo da Vinci (Rome, Italy).
UV-CIPP AT THE INTERNATIONAL AIRPORT OF ROME FIUMICINO
What I did: I wrote the whole know-how of the company in an internal handbook containing all the instructions concerning production procedures, calculation methods and in-situ procedures of the CIPP technology. I also organized and carried out the specialized training for engineers and operators of Soncini’s licensees.
What I did: the R&D for the improvement of the Cement Mortar Lining (CML) technology and the detailed design and manufacturing supervision of motorized lining machines.On the application side I made the detailed design of the rehabilitation, by CML, of existing DN1000 (40″) and DN 1200 (48″) steel water mains, for a total length of 3.000 m (9.800 ft), in the City of Milano, Italy. Thanks to CML technology the Client, Metropolitana Milanese Spa, saved more than 80% of construction costs and up to 98% of earth-moving compared to a traditional open-trench replacement.
What I did: I made the feasibility study and wrote the technical standard for the rehabilitation, by flexible high-pressure hoses, of two 12″ oil pipeline, each one 1.800 m long, with multiple curves. Total length 3.600 m (11.800 ft).
What I did: detailed design and project management of the replacement, by pipe bursting, of concrete sewer pipes DN200-400 (8-16 in) and of the rehabilitation by UV-CIPP of concrete sewer pipes DN 250, 400, 600, 700, 800, 900 and 1000 mm (10, 16, 24, 28, 32, 36 and 40 in) for a total length of 2,5 km (1,6 miles) at the Florence American Cemetery of the WWII.
PIPE BURSTING AND UV-CIPP AT THE FLORENCE AMERICAN CEMETERY OF THE WWII