{"id":5306,"date":"2026-09-11T19:29:05","date_gmt":"2026-09-11T11:29:05","guid":{"rendered":"https:\/\/www.connectionflexible.com\/?p=5306"},"modified":"2026-09-11T19:33:30","modified_gmt":"2026-09-11T11:33:30","slug":"conflex-flange-coupling-solution-for-simiyu-large-scale-water-supply-expansion-project-tanzania","status":"publish","type":"post","link":"https:\/\/www.connectionflexible.com\/kk\/project\/conflex-flange-coupling-solution-for-simiyu-large-scale-water-supply-expansion-project-tanzania\/","title":{"rendered":"Conflex Flange Coupling Solution for Simiyu Large Scale Water Supply Expansion Project, Tanzania"},"content":{"rendered":"

\"Simiyu<\/h1>\n

Conflex Flange Coupling Solution for Simiyu Large Scale Water Supply Expansion Project, Tanzania<\/b><\/strong><\/h1>\n

Project Background<\/b><\/strong><\/h2>\n

The Simiyu Water Supply Expansion Project is a key municipal livelihood project in north western Tanzania, undertaken by the main EPC contractor. The overall project includes water intake facilities, a water treatment plant with a designed capacity of 69\u202f000\u202fm\u00b3 per day, seven water storage tanks, 175\u202fkm main transmission pipelines and around 300\u202fkm distribution networks, delivering potable water to Nyashimo, Bariadi, Lagangabilili and surrounding residential areas.<\/p>\n

The pipeline corridor crosses plateau undulating terrain with seasonal heavy rainfall, soft backfill soil and uneven ground settlement risks for buried pipelines. The network mixes ductile iron pipes, steel pipes and locally sourced HDPE pipes; working pressure is rated PN16 for the main trunk line, conveying treated drinking water for urban and rural domestic supply. Large diameter connections occur frequently at tank outlets, pumping station interfaces and pipe material transition sections, putting high demands on sealing performance, dimensional adaptability and underground anti corrosion capability.<\/p>\n

\"\"<\/p>\n

Customer Requirements<\/b><\/strong><\/h2>\n

During the tender phase, the main EPC contractor faced a critical on-site engineering dilemma: multi-source procurement created inconsistent outer-diameter tolerances across ductile-iron, steel and HDPE pipe sections at key transition joints. Standard off-the-shelf flange couplings could not cover the actual OD deviation range, and rigid flange connections were vulnerable to leakage triggered by ground differential settlement. Conventional on-site cutting, welding and re-flanging would consume substantial construction time and skilled local labour, threatening the overall project milestone schedule.<\/p>\n

Translated into formal procurement specifications, the contractor required a connection solution satisfying the following key requirements:<\/p>\n

    \n
  1. Accommodate actual pipe outer-diameter deviations from mixed-supply ductile-iron, steel and HDPE pipes while maintaining stable sealing under PN16 working pressure;<\/li>\n
  2. Resist leakage risk induced by buried-pipeline differential ground settlement, provide certain angular deflection compensation capacity;<\/li>\n
  3. Comply with drinking-water contact safety standards for gasket materials;<\/li>\n
  4. Heavy-duty anti-corrosion coating suitable for tropical humid buried soil environment;<\/li>\n
  5. Match specified ISO PN16 flange drilling pattern, minimise on-site hot-work cutting and welding work to speed-up installation progress;<\/li>\n
  6. Short customisation and delivery lead-time to align with tight pipeline construction window before rainy season.<\/li>\n<\/ol>\n

    \"municipal<\/p>\n

    The \u00a0Solution<\/b><\/strong><\/h2>\n

    After reviewing project drawings, as-built pipe OD survey records, working pressure, buried installation environment and construction-schedule constraints submitted by the main EPC contractor, Conflex technical team proposed an integrated solution combining universal flexible flange adaptors, dismantling joints and transition couplings for heterogeneous pipe-material joints.<\/p>\n

    Faced with the core pain point of inconsistent pipe outer diameters from mixed procurement, standard-range products alone could not cover the full on-site OD tolerance band. Conflex flexible flange adaptors adopt multi-segment gripping-sealing structure: rather than relying on strict pipe dimensional conformity like rigid flanges, the elastomer gasket assembly absorbs manufacturing and on-site OD variations while preserving PN16 sealing integrity. For connections between dissimilar pipe materials (ductile-iron to steel, steel to HDPE), matched transition couplings eliminate the need for complex on-site fabrication. Incorporated dismantling joints offer axial draw-out allowance, simplifying later-stage equipment maintenance and pipeline disassembly at water-tank and pump-station interfaces.<\/p>\n

    Compared with the alternative of site-cutting and welding conventional rigid flanges, this flexible connection scheme drastically reduces hot-work operations, lowers dependency on high-level local welding crews and compresses joint installation cycle.<\/p>\n

    Engineering & Customization<\/b><\/strong><\/h2>\n

    Given that several trunk-line joints fell outside standard product OD ranges, Conflex R&D and engineering department performed strength calculation according to PN16 design parameters based on customer field-measured pipe OD data. Custom-modified flexible flange adaptors were developed to cover the project-specific outer-diameter tolerance window.<\/p>\n

      \n
    • Flange drilling: custom machined strictly following project-specified ISO PN16 bolt hole layout to match the main EPC contractor-supplied valves and equipment interfaces;<\/li>\n
    • Gasket material: selected food-grade EPDM rubber certified for potable-water service, resisting ageing under tropical high-temperature conditions;<\/li>\n
    • Coating system: applied heavy-duty fusion-bonded epoxy (FBE) anti-corrosion coating, optimised for humid tropical buried soil to mitigate soil corrosion and microbiological attack;<\/li>\n
    • Product drawing review: Conflex issued custom fabrication drawings for the main EPC contractor\u2019s engineering approval prior to production.<\/li>\n<\/ul>\n

      Benefiting from Conflex\u2019s in-house capability of more than 500 standard product series and mature custom workflow, the whole engineering-to-delivery cycle was tightly controlled to satisfy the pre-rainy-season construction timeline. This customised technical capability became one of the decisive factors for winning the tender order.<\/p>\n

      \"water<\/p>\n

      Project Results<\/b><\/strong><\/h2>\n

      All Conflex supplied flange adaptors, dismantling joints and transition couplings passed factory inspection and witnessed on-site hydrostatic pressure testing at PN16; no leakage was detected during commissioning phase.<\/p>\n

      The flexible connection solution effectively accommodated pipe OD deviations and absorbed partial ground differential-settlement displacement. On-site hot-work cutting-and-welding processes for more than 120 key joints were largely avoided. Average installation time per critical joint was reduced by approximately 60\u202f% compared with conventional rigid-flange field fabrication. The whole batch of fittings was installed and commissioned before the arrival of main rainy season, supporting the milestone progress of trunk-line pipeline laying. Up to present, these connection points have been in stable continuous operation without reported seal-failure leakage.<\/p>\n

      Customer Feedback<\/b><\/strong><\/h2>\n

      Statement from Project Manager, Main EPC Contractor of Simiyu Water Supply Project \u201cMixed-source pipe procurement brought big OD variation headaches at tender stage. Conflex\u2019s customisable flexible flange coupling solution solved our sealing and installation bottleneck. Short custom drawing approval and delivery helped us beat the rainy season construction deadline. The on site pressure test performance meets all project specifications.\u201d<\/p>\n

      CTA<\/b><\/strong><\/h2>\n

      Tell us your pipe outer diameter, pipe material, working pressure, medium and site installation conditions. Our engineers can recommend standard products or develop custom-modified flange coupling connection solutions for your water-supply, wastewater or pipeline-upgrade project.<\/p>\n

      \"Flange<\/p>","protected":false},"excerpt":{"rendered":"

      Conflex Flange Coupling Solution for Simiyu Large Scale Water Supply Expansion Project, Tanzania Project Background The Simiyu Water Supply Expansion Project is a key municipal livelihood project in north western Tanzania, undertaken by the main EPC contractor. The overall project includes water intake facilities, a water treatment plant with a designed capacity of 69\u202f000\u202fm\u00b3 per […]<\/p>\n","protected":false},"author":1,"featured_media":5308,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[73],"tags":[],"class_list":["post-5306","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-project"],"acf":{"photo_gallery":{"\u9879\u76ee\u56fe\u72471":[[]]}},"jetpack_publicize_connections":[],"_links":{"self":[{"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/posts\/5306","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/comments?post=5306"}],"version-history":[{"count":5,"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/posts\/5306\/revisions"}],"predecessor-version":[{"id":5317,"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/posts\/5306\/revisions\/5317"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/media\/5308"}],"wp:attachment":[{"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/media?parent=5306"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/categories?post=5306"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.connectionflexible.com\/kk\/wp-json\/wp\/v2\/tags?post=5306"}],"curies":[{"name":"Qeyd","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}