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Hot water buffer tanks, Hot water accumulator tanks

Hot water accumulator tanks are reservoirs for storing water of up to 95°С. Accumulator tanks are installed in the hot water supply system between the hot water producing units and its consumers. The necessary amount of hot water stored in accumulator tanks helps level the hot water flowing, thus providing efficient work of the district heating supply system.

Hot water accumulator tank is, in effect, a vertical steel tank with some additional structural components (like rims protecting from failure). Hot water accumulator tanks are classified as a separate group of industrial constructions according to Regulations for safe maintenance of heating containers. As a rule, in Russia and the CIS countries tanks of 100m³, 200 m³, 300 m³, 400 m³, 700 m³, 1000 m³, 2000 m³, 3000 m³, 5000 m³, 10000 m³, 15000 m³ and 20000 m³ capacity are used. The reason is that since the USSR times there existed a document called “Hot water accumulator tank standard plan (903-9-15sp86, 903-9-16sp86)” that allowed these capacities, but at present this document is invalidated. That is why it is important to be guided by working regulatory documents while designing hot water accumulator tanks.

Thus, the sequence of tanks construction procedures consists of three stages: ordering the project design of accumulator tank, purchasing metal structures, ordering their installation.

Hot water accumulator tanks production

JSC “RussianTankWorks” manufactures hot water accumulator tanks in factory conditions by coiling and per-sheet methods. According to the coiling method, the wall and bottom strip panels are welded at the factory and coiled on a special coiling machine.

Accumulator tank metal structures include steel walls, bottom and roof. Wall strip panels are manufactured belt-by-belt from rolled steel (usually, St3sp5 or 09G2S) of various thickness up to 16 mm. The coiling machine allows using two-side automatic submerged-arc welding, which produces high quality joints and reduces production terms. Also, it guarantees the correct geometry of wall and bottom coils, absence of clearance gaps, deformations and other defects typical for metal structures coiled on the floor by hoisting. The per-sheet method means that the accumulator tank is delivered to the construction site in the form of metal structures: steel sheets with weld groove. Wall strip panels are rolled according to the project design radius.

JSC “RussianTankWorks” produces and supplies hot water accumulator tanks in set with heat insulation installation hardware and progressive collapse protection structures. These external reinforcing structures include binding (horizontal circular belts) and vertical reinforcing ribs. Binding is installed on accumulator tanks according to the project design at certain intervals, depending on extension force and trap doors and filler necks location.


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Accumulator tanks installation

After the metal structures of a hot water accumulator tank are manufactured, they should be assembled on the construction site and incorporated into a heating power plant. Installation of accumulator tanks is a successive combination of procedures that include development of a working plan, foundation construction, tank installation, its rustproof coating and heat insulation, and construction of bund walls around a tank group.

JSC “RussianTankWorks” carries out all of these procedures, boasting the highly professional staff of welders and installation workers, specialized machinery, welding equipment of world leading brands, access to hazardous and highly hazardous production facilities. Our Construction and Assembly management will install a key-ready hot water accumulator tank anywhere in Russia and the CIS.

We recommend applying complex rustproof coating for metal and aeration protection for water, based on the technology of floating seal liquid. Mixed protection based on the floating sealer and rustproof coating for metal surface can also be applied.

Cathodic protection system for metal is often used along with above-mentioned measures.

 

 

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Hot water accumulator tanks documentation

Ordering a key-ready hot water accumulator tank at “RussianTankWorks”, the Customer receives the full set of documents, which guarantees a problem–free start-up. The following documents should go with the hot water accumulator tank:

  • Production and detailed drawings;
  • Certificates for tank steel structures;
  • Bridging documents for deviations from drawings;
  • Hidden works examination acts;
  • Certificates for metal and other materials;
  • Geodetic measurements results;
  • Logs of erection work;
  • Test certificates of weld joints sealness and tank strength tests;
  • Inventory of welders’ certificates;
  • Finding of off test erection joints;
  • Inspection certificates of installed equipment;
  • Tank grounding connection plan and test certificate;
  • Tank foundation leveling plan;
  • Anticorrosive protection system certificates;
  • External reinforcing structures test certificate;
  • Tank certificate of acceptance.

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Delivery calculation

Hot water buffer tanks, Hot water accumulator tanks
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