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These are the reasons:

  •  Tanks, designed and built by Fire Piping Tanks, meet the highest standards of public entities and private companies.
  • Fire Piping Tanks is responsible for all processes of design, manufacture and assembly.
  • The provision of a complete project, with guarantee and responsibility, offers long-term security.
  • The specialization in this field, makes us to offer a product with excellent value and with maximum guarantees.
  • The designs and drawings are made through automated computer calculation processes and meet international standards for bolted atmospheric tanks.

We offer two Sealing Systems:

We offer two Sealing Systems:


  • Bolted connections and special polyurethane mastic guarantee a tank free of leaks.
  • The double expansion joint between the tank ring nut and concrete, seals the joint hermetically


  • PVC inner membrane reinforced plastic polythene protected and geotextile blanket.
  • Special joints in neoprene.
  • The second phase of concreting inside is not necessary.
  • Possibility of using membranes for drinking water.

Table of dimensions and capacities MEMBRANE

Tabla de dimensiones y capacidades MASTIC

What are the advantages of the screw manufacturing?

  • Screwed tanks can be assembled quickly and automatized with low cost assembly, do not need the high costs of welding.
  • Easy and economical transportation to anywhere in the world, disassembled and palletized in containers.
  • Bolted connections and special polyurethane mastic guarantee a tank free of leaks.
  • The double expansion joint between the tank ring nut and concrete, seals the joint hermetically.
  • Quick Supplies due to the existence of standard panels in stock.
  • Our tanks do not require special maintenance.
  • Flexible design capabilities and standardized for between 20 and 8,000 m3
  • Possibility of displacement.
  • No need to be painted.
  • Easy assembly of a wide variety of accessories such as flanged connections, manholes, anti-vortex, stair and platform, veneer floors, ceilings, trims, etc …
  • Respect for the environment in the use of materials.



Variety of finishes: GALVANIZED, PAINTED,...

Rectangular tanks

They are a solution for certain types of work where there is limited space.

We adapt to the available surface, rectangular tanks can be done, squares … allowing to save columns or leave them in the tank.

These tanks are built on a single sheet folded ring nut “fretwork” of up to 2.5 m high and 1 m wide. Depending on its size the tank is internally reinforced with tension or transverse straps.

The material specifications are the same as for cylindrical tanks.

Depósito Rectangular
Depósito Rectangular
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Deposito Rectangular Foto 5
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Any fire protection system must have a water supply system capable of ensuring the required flow so that the corresponding installation can operate without interruption for the time necessary to contain or extinguish the fire.

Water sources will be categorized into three fundamental groups: the public water supply system, the inexhaustible water sources and the fire water storage tanks.

In this article we will focus on fire water storage tanks, which must follow a specific process for their design, manufacture and subsequent assembly in the corresponding fire protection installation

At Engineered FirePiping S.L. we have developed our firefighting tanks with the existing “state of the art” software, such: Cypemetal 3D, Tekla, Technometal, SolidWorks and AutoCad. The use of this software package generates a correct fire-fighting tanks design, calculations and simulation.

Like most of the industrial markets, the fire protection sector, is covered by Norms and Standards .The ones covering the design, fabrication and installation of water supply tanks are : AWWA D-103 (American Water Works Association), FM 4020, NFPA 22, UNE 23.500.  The objective of all of them is to facilitate the manufacture and installation of fire water storage tanks

FIREPIPING water tanks for fire protection meet the highest requirements in terms of quality and design, and are approved by: UNE, CEPREVEN and FM.

Types of fire protection tanks according to tank sealing

Depending on their sealing system, we classify the water supply tanks for fire protection into two groups: membrane tanks and mastic tanks.

In membrane type tanks the inside of the tank is lined with a 1,100 gr/m2 density PVC liner and neoprene joints in all the existing connections in the tank. In mastic tanks the water tank tightness is done by sealing the tank inside with Sikaflex 11 FC polyurethane mastic and a double Sikawell P2010 expansion joint.

Drinking water Membrane tanks can also by supplied by combining the PVC liner with AISI- 316 stainless steel accessories and special neoprene gaskets.

The concrete base and shell are also lined with geotextile matting to provide additional protection against damage to the liner so it can reach up 20-year life span

Types of fire protection tanks according to tank geometry

Tanks can be circular or rectangular. Beside the tank geometry, differences lie on the internal and external tank structural reinforcements

Tank Materials

Material used for CEPREVEN approved circular and rectangular shaped tanks is S280 Z275 MAC structural steel plate. For FM approved tanks we use S355JR Z350 MAC structural steel.

Steel has “hot deep” galvanized layer (minimum 270 µm/m2).  galvanised They will therefore be manufactured in structural galvanised steel with at least of zinc, in corrugated strips, in formats of up to 3 metres in height and 1 metre in width, with exterior and interior L and U reinforcements (in addition to pillars) to compensate the internal  water pressures.

Water tanks civil works.

The required civil works are different for membrane tanks than for mastic ones. Mastic tanks require a more complex foundation than membrane tanks.

Paramount aspects are; type of concrete and tank anchor to the foundation

Fixing to the concrete shall be done be means of mechanical anchors and bolts.

Membrane tank base is a concrete single layer with a flat and smooth surface. A special anchor for concrete shall be used. Mastic tanks foundation are more complexes, requiring two different concrete layers. The first one is internal and shall be ready before the tank installation. The second one is external and shall be built once the tank is totally erected.

Recommendation for the use of rectangular tanks for fire protection

 This is a very useful solution for the fire protection systems water supply where space is limited, such as basements or roofs, and it shape can be easily adapted to the available surface area shape.

This will create the highest capacity for the limited existing area.

Some clear advantages of installing these rectangular tanks for fire-fighting systems are

Assembly process is faster and can be automated (4 to 6 days)

– Tank can have an anti-seismic.

– No problem for tank relocation if required.

– Tank components can be container shipped.

Low maintenance costs and easy repairing.

No painting required.

– Tank can be customized with company logo.

– Comparative lower transport, installation and maintenance cost.

Accessories included on tank supply scope.

Our tanks are supplied with all the necessary accessories for their correct operation. Some of them are:

 accessories that can be supplied with the tank are described below: perimeter angles, reinforcements, float filling valve (including float), manhole with cover, aluminium made ladders, hydrometer, valved drain connection, anti-vortex plate on suction pipe.

Wide optional painting finishes

Tanks supplied by Engineered FIREPIPING S.L. could be painted according to an specific painting procedure and chart RAL colour if required.

Standard painting process includes:

  1. Ammonium bifluoride based material degreasing and chemical cleaning.
  2. Oven drying at 120 degrees Celsius.
  3. Application of an epoxy wash primer minimum dry film thickness of 20 µm layer.
  4. Electrostatic application of a minimum dry film thickness of 100 µm finishing coat of polyester resin powder,
  5. Finish the process with an oven polymerization at 190 degrees Celsius for 20 minutes.



Pipe is specified by stating its nominal size (NS), which is only approximate. Nominal size is neither the inside nor the outside diameter and it is necessary to use standard tables or manufacturers’ tables to ascertain these two dimensions exactly.

The types of steel and the thicknesses of the pipes vary with the manufacturing standards, so for example standards like EN 10216-1 or EN 10217-1 have a wide range of wall thicknesses for each nominal diameter, and others like EN 10255 have three types of pipes depending on the wall thickness, H, M and L.

ANSI/ASME B36.10M. as a dimensional standard. In this standard, the thickness is defined by the Schedule number (SCH), as the schedule number increases so does the wall thickness, and as a consequence the inside diameter reduces The ASME standards corresponding to the types of pipe used in fire protection installations are ASTM A106, A 53, A 795, A 135.


Carbon steel pipe is the most used in the aboveground sections of fire protection installations. Below, we present the most common types of steel pipes, as well as some characteristics linked to their manufacture.

The two most common types of steel pipes used in fire protection,

There are four common methods of joining piping, each with its own advantages and disadvantages; Butt welded, Socket-welded, Threaded and Grooved


Butt welded systems

Butt welded piping systems are used for most process, utility or service piping. Butt welding is the most practicable way of obtaining strong, leak-proof joints, especially on larger piping. The pipe and fittings used have, or are prepared with, standard weld preparation. They require high levels of workmanship in their assembly and welding.

Socket welded systems

Socket-welded piping systems are used for lines of small diameter which carry flammable, toxic or expensive materials where no leakage is permitted. They are easier to assemble and weld than butt welds and no weld metal can enter the bore. The pipe end is finished square and fitted into the fittings, usually with a 1.5 mm gap. This gap sometimes pockets liquids and is not recommended if severe erosion of crevice corrosion is anticipated.

Threaded systems

Threaded piping systems are used for small lines, usually of 50 mm diameter and are easily assembled using standard fittings. The removal of metal to create the thread is a disadvantage and fatigue strength is poor. There is no need for coded welders when a screwed pipe system is used except where seal welding is undertaken.

Grooved systems

Grooved piping system is the most versatile, economical, and reliable joining method for fire protection piping system. The coupling body performs several functions. It contains the rubber gasket and holds it firmly in place for proper sealing. The body also embraces the entire circumference of the end of the pipe, so that it holds them together, but still allows for flexibility. The leak-free joint is made without exposing workers or properties to the effects of fire, smoke and other risks associated with the cutting and welding process.


A comparative table is included with the four mentioned joining. Following systems main characteristics are compared: Pipe end preparation, installation, pre-fabrication possibilities, maintenance and reparation. Both, technical and economics, advantages and disadvantages are included

After the table analysis we can conclude, that thanks to its specific features, grooved system is the most appropriate pipe joining method for Fire protection Systems.

Pipe end preparation is fast and easy, installation process requires only the fastening of a couple of bolts and nuts, connected pipes are able to allow deflection and axial displacement, a few room is required for installation, so it can be installed in small spaces. Pipe prefabrication process is very easy. Product quality is easily controlled at both, the factory and job site. Installation can be visually checked. Surface protection can be easily applied.  No “hot jobs” are required for dismantle or reinstall operations and design and cost estimation could be easily done.

All these features made this joining process the most appropriate for prefabrication, because most of the preparation works can be automatically performed at the factory with a higher performance, less cost and better-quality control. The required number of on-site working hours decrease dramatically and consequentially the total cost of the installation also do it.


Pipes that are manufactured according to a mechanical deformation process, cold or hot.


– S.S.P. pipe is manufactured from a cylindrical steel ingot that is heated in a furnace before extrusion. During the extrusion it is passed through a cylindrical die and then the hole is made by means of a penetrator

– Existing pipe Standards for seamless steel pipe for fire protection systems are; ASTM A 106, API 5L, EN 10216-1, ASTM A53 S, ASTM A795 S, EN 10255 S


Pipes that are manufactured from a steel strip, of appropriate width and thickness. The welding processes can vary; electric resistance welding (E.R.W.), high frequency welding (H.F.I.) or submerged arc welding (S.A.W.).

Pipes for fire protection systems are longitudinally welded HSW type. Spiral welded pipes are only used for large diameters that are not commonly used in fire protection systems.


–  Welded pipe is produced by forming a cylinder from flat steel sheets
coming from a hot strip mill. The welded seam is either parallel to the tube axis or in a spiral direction about the tube centreline. By varying the spacing between the rolls bend radius can change to manufacture different pipe diameters.

– Existing pipe Standards for welded steel pipe for fire protection systems are: EN 10217-1, EN 10255 W, ASTM A53 W, ASTM A795 W, ASTM A135.