Potable water tanks

We provide services and investments related to the design and construction of drinking water tanks for SUW water treatment plants. We make our installations throughout Poland and abroad. We also offer a professional and well-organized service of drinking water tanks – both from our distribution and made by other manufacturers.

Potable water tanks


Our many years of experience in the industry have allowed us to design and introduce a wide range of drinking water tanks to the offer. Our tanks meet all, even the most complex requirements set by customers, but also guarantee compliance with stringent legal standards set for each drinking water tank. Each of our tanks intended for drinking water is approved for use by PN-EN and has a current certificate of the National Institute of Public Health issued for the entire structure of the tank along with its devices.

The structure of the above ground drinking water tank consists of steel panels with dimensions of 2.5mx 1.25m, joined together by means of hot-dip galvanized screws, made of acid-resistant steel or covered with specialist powder paint in the color chosen by the customer from the RAL palette we offer .

Drinking water tanks


The tightness of the water tank is ensured by an individually prefabricated EPDM membrane or specially designed panels for this purpose, painted on the inside with epoxy paint with a chemical seal, polymer mass having permission to contact drinking water. Depending on the type of sealing chosen by the customer, in Miltom workshops we make internal insulation from XPS panels on the entire surface of the tank walls and an outer layer of high-quality mineral wool, additionally protected by us with a trapezoidal sheet facade in any color from the RAL palette. We adapt the technical equipment of each drinking water tank we offer to the individual and specific needs of the Ordering Party, but at the same time ensuring that all formal requirements strictly specified by law are met, adapting the tank to be used for its intended purpose.

Zbiorniki na wodę pitną do SUW


Tank Roof

The roofs of clean water tanks we use are, by design, a self-supporting structure made according to the concept based on trapezoidal panels or laminated prefabricated elements. Therefore, they are characterized by high resistance to UV rays and harsh weather conditions for a long period of planned operation.

The surface sealing of roof mats used in our projects excludes the possibility of dirt, insects and rainwater entering the tank. Potable water tanks supplied by Miltom have the necessary hygienic certificates of PZH and are used in food processing, gardening, agriculture as well as in drinking water treatment plants. The roof structure can be made in several variants we offer. This provides the customer with the opportunity to select an individual solution optimally suited to the needs.

Roof variants

  • laminated precast elements
  • Miltom’s proprietary conical design
  • T35 trapezoidal sheet


Advantages of
the tank

The tanks we offer and produce for storing water intended for consumption, have a current PZH certificate and therefore can be used in food processing, water treatment plants, water supply networks, agriculture and all types of industrial and manufacturing plants where safe and clean is essential living water for people and animals.


Galvanized steel protected with polyester or epoxy powder paint


AISI 304 (1.4304) stainless steel or AISI 316L (1.4401)


and standards

Atest pzh dla zbiornika wody pitnej

PZH certificate

Zbiornik przeciwpożarowy - montaż


We offer:

  • inspections of fire tanks
  • technical inspections
  • cleaning the inside of the tank
  • replacement of insulation, membranes, tank roofs
  • repairs of heating and water level monitoring systems
  • expansion (tank enlargement)
  • location changes

Technical Specifications

Construction information


Tank series

  • Download file with size table
  • The diameter of the tanks ranges from 3.1 m to 21.7 m
  • Tank height from 2.4 m to 13.2 m
  • It is possible to build a tank with a higher height

Performance norms

  • PN-EN 1990:2004/AC:2010 „Eurokod. Basics of structural design.”

  • PN-EN 1991-1-1:2004/AC:2009 „Eurokod 1. Actions on structures. Part 1-1. General impacts. Volumetric weight, self weight, payload in buildings.”

  • PN-EN 1991-1-3:2005/AC:2009  „Eurokod 1. Actions on structures. Part 1-3. General impacts. Snow load.”

  • PN-EN 1991-1-4:2005 „Eurokod 1. Impact on structures. Part 1-4: General actions. Wind actions”.

  • PN-EN 1993-1-1:2006/AC:2009  „Eurokod 3. Steel structure design. Part 1-1. General rules and rules for buildings.”

  • PN-EN 1993-1-3:2008/AC:2009 „Eurokod 3. Steel structure design. Part 1-2: General rules. Supplementary rules for structures made of cold-formed sections and sheets.”

  • PN-EN 1993-4-2:2009 „Eurokod 3. Steel structure design. Part 4-2: Tanks.”

  • PN-EN 1993-1-6:2009 „Eurokod 3. Steel structure design. Part 1-6: Strength and stability of coating structures.”

  • PN-EN 1090-2+A1:2012 „Execution of steel and aluminum structures. Part 2: Technical requirements for steel structures.”

  • PN-EN ISO 13788:2013-05 „Thermal and humidity properties of building components and building elements. The internal surface temperature necessary to avoid critical surface humidity and interlayer condensation. Calculation methods.”

  • PN-EN 12831:2006 „Heating installations in buildings. Method for calculating the design heat load.”

  • PN-EN ISO 12944-2:2018-02 „Paints and varnishes. Corrosion protection of steel structures with protective paint systems. Part 2: Classification of environments.”

  • PN-EN ISO 12944-5:2020-03 „Paints and varnishes. Corrosion protection of steel structures with protective paint systems. Part 5: Protective painting systems.”

  • PN-EN ISO 14713:2000 „Corrosion protection of steel and cast iron structures. Zinc and aluminum coatings. Guidelines.”


Foundation slab
The MILTOM system tanks intended for storing drinking water are placed on a reinforced concrete foundation slab. Reinforced concrete foundation slab is designed individually for a specific location, based on soil and water conditions received from the Investor. It is made of hydrotechnical concrete min. class B25 (C20 / 25) W8 F100, frostproof and waterproof. Top and bottom reinforcement of the tank bottom plate made of A-IIIN BSt500 steel. Cover of the reinforcement from the bottom and sides 5 cm, from the top 7cm. The bottom slab is made on a B10 concrete foundation with a minimum thickness of 10 cm. The diameter of the foundation slab is made in the form of a circle or polygon with a diameter of about 0.9 m larger than the internal diameter of the tank.

Only the weight of water accumulated in the tank can be taken for calculating the strength of the foundation. The weight of construction and piping is up to 2% (for tanks up to 300 m3) up to 5% of the weight of water. Therefore, it can be omitted by using other safety factors resulting e.g. from the possibility of tank overfilling. The decision on the calculated weight of the tank and the size of the safety factors is up to the designer.

Applied technologies
Our drinking water tanks are made in two technologies. With internal membrane made of EPDM or with sealing of metal sheets for Sabatack 750 or 780 mass.

The tank is sealed with an EPDM membrane

with PZH certificate, it is placed on a properly prepared and maintained foundation slab. The membrane is a polymer geosynthetic barrier, made of vulcanized EPDM. Calendered in two layers, without reinforcement. This gives it unique properties especially when it comes to flexibility and elasticity (300% stretch). The membrane is separated from the tank foundation with a polypropylene geotextile with a grammage of 300g / m2, which protects it from mechanical damage during assembly and operation.

Sealed tank constructions for Sabatack mass

are placed in a previously prepared technological groove 45 mm wide and 50 mm deep located at the height of the perimeter of the tank shell structure. In order to permanently and tightly connect the tank walls with the bottom plate, the tank groove is filled with SABA self-filling mortar. After the resin has hardened, the groove is additionally secured with a permanently elastic Ecoseal Bio HM material, which is approved for contact with drinking water. The bottom of the tank is additionally protected with Aquafin-1K M-PLUS mortar.

Tanks with sealing and protection of all connections of tank shell elements with Sabatack 750, 780 mass are painted from the inside with Faproxyd 620 powder paint in signal blue (RAL5005) from WODROL.

Tank walls
In both technologies, the tank walls are made of galvanized steel grade S350GD + Z275 or acid-resistant AISI 304 (1.4304) or AISI 316L (1.4401) with sheet dimensions of 1.25 mx 2.5 m. The thickness of the jacket depends on the size of the tank and the required standards . Individual sheets are overlapped vertically and horizontally using M12 screws, class 8.8. The tank walls are reinforced horizontally with rings made of sheet metal 2.0 – 4.0 mm thick. The tank is attached to a concrete foundation using galvanized L70x50x5 angle brackets made of S235 steel, brackets and expansion anchors.

Additional options
At the customer’s request, it is possible to powder paint the surface of the sheets or cover the installation jacket with trapezoidal sheet in the selected RAL color from the available “Pruszyński” color palette.

Painting the tank shell or the facade made of trapezoidal sheet is an additional layer of protection against the external environment, significantly extending the correct operation of the tank and its trouble-free operation, as well as provides an additional visual and aesthetic effect.

Tank roof

Depending on the investor’s needs, we cover drinking water tanks with a dome made of polyester-glass composite or a conical roof. All our roofs are self-supporting structures, which causes no contact of water with structural elements, significantly affecting their life expectancy.

The use of roof covering in the form of “KS” dome (self-supporting dome).

This cover consists of spherical elements (i.e. the shell of the element is a fragment of the sphere) with lateral flat flanges lying on the spherical surface of the sphincter, sphincter cover and drip cap (without a gutter) around the entire perimeter of the tank. The spherical elements are joined together with a lap screw connection. Each lap screw connection of the cover elements’ flanges is sealed with two rows of 10×15 [mm] EPDM gaskets. The distance between the axis of the torsion screws and anchors fixing the cover elements to the steel structure of the tank is not greater than 330 [mm]. A drip made of polyester-glass laminate is located between the flange of the extreme element and the steel structure. Between the drip and the wall of the tank and between the drip and the cover elements there are two rows of EPDM gaskets with a cross section of 10×15 [mm]. Spherical elements made of polyester-glass laminate insulated with 60 [mm] thick PU foam – the foam is not placed at screw joints.

Conical tank roof construction (truncated cone)

is articulated on the tank walls. The roof pitch is approximately 15º. Roof bearing beams made of cold-bent galvanized profiles Pruszyński steel sheets 2xC150x48x2.0 made of S350GD steel are arranged radially evenly. Roof support beams fastened in the roof crown with a round duct with a diameter of d = 856 mm and a calculation equivalent I-section Hśr x Bpg x Bpd = 172x344x158 welded from steel plates with a thickness of 8 mm made of S235 steel. Connection of support beams with M12-class 8 screw jumper. 100 mm thick Styrodur-3000CS insulation was laid between the support beams. The roof is covered with flat sheet, 1.0 to 3.0 mm thick. All roof connections in the tank are secured from the inside with Sabatack mass. The shape of the roof structure ensures free drainage of rain and snow from the roof surface to each side of the tank.

Tank equipment

Regardless of the shape and type, each roof of the drinking water tank is equipped with:

  • Supply ventilation chimneys (air intake) enabling free air flow to the space under the roof covering (protection of the roof covering against negative pressure caused by the variable level of liquid in the tank); a gravitational inflow of air is assumed.
  • Pipe connectors permanently laminated into the cover coating to ensure the connection of a ventilation system for collecting contaminated air from the space under the roof. The ventilation designer determines the number, size and location of the connectors. The proposed solutions must be consulted with the roofing manufacturer.
  • Manhole dimensions of 800 x 800 [mm] The hatch is equipped with hinges and swing limiters for an opening angle of up to 95 °. The fittings are made of A4 steel. The location of the manhole, sockets and ventilation chimneys is agreed at the stage of detailed arrangements for the technical implementation of the cover.
  • A filter protecting the penetration of insects, rodents, birds, dust made of stainless steel mesh with a mesh density of 0.5mm is placed in the ventilation fireplace, which also prevents the entry of atmospheric pollution.
  • Each of the tanks is equipped with external thermal insulation made of ProRox SL 960 PL mineral wool, 10 cm thick, additionally protected with T18 x 0.7 “Pruszyński” trapezoidal sheet painted in any color from the RAL color palette. This location of the insulation ensures long-term preservation of thermal properties and no degradation of the material under the influence of moisture.
  • The equipment of tanks also includes: supply (pressure) pipeline, suction pipeline, overflow pipeline and drain pipeline, made of acid-resistant steel or polyethylene with a diameter adapted to the requirements of the Employer.
    All the materials we use ensure that the investor is provided with the highest quality product that meets the stringent requirements of the norms and required standards.

The full modularity of the structure allows for quick assembly, as well as the possibility of any modifications to increase the required tank capacity if necessary. Our tanks are equipped with all necessary connections and devices required for efficient cooperation in Water Treatment Stations or plumbing installations. High quality workmanship allows you to get a long-term warranty, ensuring long-term trouble-free use of the tank.


Warranty protection

Miltom guarantee

Any existing steel fire protection tank or fire protection installation – both built by us and other manufacturers – we can cover our warranty and service care. We accomplish this by providing customers with the opportunity to purchase the warranty protection package we offer . The basis for issuing such a guarantee to you is before we sign the contract, technical inspection of the tank or device.

Tank sales specialist

Andrzej Konieczny
Tel. +48 22 844-59-39
Mob.+48 693 366 366

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