ACO Pipe Stainless Steel


The ACO PIPE® stainless steel socketed push-fit pipe systems offer a modern alternative to plastic and galvanised pipes for water drainage and vacuum applications. The ACO PIPE® system is highly resistant to aggressive media and offers simple assembly enabling greater flexibility in its application and installation. Installations are considerably lighter than with conventional black steel systems and have a high fire safety rating and are highly resistant to corrosion.  By request AISI 317 options are available to meet particular corrosion associated with increased levels of chlorine. For more details on these types of installation please contact us[link to contact section “4”] All these attributes offer the user a system that represents not only excellent value but also high performance. The ACO PIPE® push-fit pipe system is recognised and certified by all leading maritime classification societies.

Material Properties

The ACO PIPE® stainless steel socketed pipe systems are made of austenitic stainless steel.

Quality Grades:
Material No.: AISI 304 = DIN 1.4301 Material No.: AISI 316 = DIN 1.457

Expansion Coefficient

Due to its low expansion coefficient, ACO PIPE® stainless steel products do not require any special measurements to be taken for installation in standard drainage and vacuum applications. The expansion coefficients of different materials are specified below. The values refer to linear expandability in mm per 1 m pipe length at a temperature of approx. 60 °C.

Raw Materials

  • Aluminum alloy 1.44 mm
  • Copper 0.98 mm
  • HDPE 9.00 mm
  • PVC 3.00 mm
  • Stainless steel 0.99 mm

The coefficients of linear expansion for various materials are as follows (°C-1)

  • Aluminum 24 x 10–6
  • Copper 16.4 x 10–6
  • HDPE 150 x 10–6
  • PVC 50 x 10–6
  • Stainless steel 16.5 x 10–6

Sound Properties

Stainless steel systems, such as ACO PIPE® fitted system, conform to the requirements for the sound properties of drainage technology under DIN 4109.


ACO PIPE® fitted systems of stainless steel are classified as inflammable, unlike cheaper plastic materials which require additional fire insulation to be fitted during installation. Drainage products of stainless steel are classified as fire-resistant materials according to fire regulations in DIN 4102 Standards.

ACO PIPE Sockets

The ACO PIPE® sockets are designed as two-chamber components for stable and durable joint fitting in the ACO PIPE® system of pipes and fittings.

The socket chamber contains a special factory-fitted ACO seal. The unique engineering design of the seal ensures that the end of the ACO PIPE fits tightly, not only onto the seal in the chamber, but also around the diameter of the inserted pipe. This slip-proof and double-seal function of the ACO seal guarantees long a lasting and leak-proof installation. Standard ACO PIPE® sockets are provided with EPDM seals and may be installed in systems exposed to temperature ranges from –50 °C to +130 °C. To further enhance performance of the ACO PIPE system in extreme temperature or media conditions, the system can be fitted with sealing elements made of Viton or NBR – details available on request and subject to system verification with the client.  Detailed information concerning the durability of seals and resistance to aggressive media are available from ACO Marine.

Tightness Values
The ACO PIPE® stainless steel socketed pipe system is suitable for operation in both vacuum applications and gravity drainage installations.

Protection against Corrosion
The ACO PIPE® stainless steel socketed pipe system (as per EN 1124) is made of Chromium-Nickel-Steel alloys that are highly resistant to corrosion and therefore suitable for operation with very aggressive media. The ACO PIPE® elements are suitable for a variety of applications in the shipping industry due to their flexibility. They offer solutions where high performance is a pre-requisite. Detailed information and guidance on the assessment of system suitability and durability against exposure to specific media is available on request.

Production monitoring ACO PIPE® stainless steel socketed pipe systems are subject to production monitoring by a certified institute. ACO PIPE® seals are also subject to production monitoring by a certified institute.

Quality management
ACO PIPE® stainless steel socketed pipe systems are subject to production monitoring in accordance to EN ISO 9001:2009. Certification The ACO PIPE® push-fit pipe system is recognised and certified by all leading maritime classification societies and affirms their high operational safety.

ACO PIPE® Installation
Effective installation is critical in ensuring reliable operation of the pipe system. The quality of the raw materials along with high quality workmanship during production of ACO PIPE® stainless steel products are indispensable quality assurance factors. Drainage systems must provide for trouble free, simply installation and flawless operation. A wide range of components provides an effective and economic solution for all situations. ACO PIPE® fittings offer technically sophisticated, state-of-the-art socket options, quick and easy to install even in situations requiring bends and combinations of various shapes of ACO PIPE® sockets and fittings. Stainless steel pipes and fittings are easy to work with, resistant to impact and combustion and able to withstand robust handling during installation. Stainless steel pipes in the ACO PIPE® range may also be delivered with long sockets to accommodate to fitting of high pressure clamps. Length adjustment is carried out with the aid of extension pipes, also fitted with end spigots. Stainless steel vacuum and drainage pipes and components, fitted with specially designed ACO PIPE® sockets, ensure enhanced stability of the drainage system. ACO PIPE® offers a variety of components with threaded connectors (with or without soundproof inserts) and pipes with penetrations that enable installation in a wide range of applications.

Cutting to Length

The length of a stainless steel pipe is adjustable with the aid of the ACO pipe cutter. Only approved tools designed for work with stainless steel components should be used during installation as using tools for other purposes may cause problems in the ACO PIPE® system.    

Connecting ACO PIPE® components during installation 

  • ACO PIPE® seals are inserted in the stainless steel sockets of the ACO PIPE® components and pipes during the assembly process at the factory and continuous Quality Assurance checks ensure the correct fit.
  • Before installing ACO PIPE® components and pipes, it is advisable to check the position of each seal prior to installation as any damage or displacement during transport or handling is beyond the control of ACO Marine.
  • The ACO lubricant, Order No.: E80 350 000, is applied in a thin layer on the spigots.
  • Push-fit the pipe end into the socket but do not push fully home into the socket recess to allow for thermal expansion within the system.

Loose Socket Connections

The lubricant dries out after a short time. Heating up the ACO PIPE® socket will loosen the connection for adjustment. Making sure that the end of the pipe fits tightly into the bottom of the socket is particularly important when installing vacuum and pressurised pipe systems. Marking the depth of the insertion with a marker helps prevent problems during installation/ assembly.

Fastening of Pipes

With horizontal pipe lines, the weight of water in the pipe system should be considered when selecting suitable fastening material and determining the number of mounting brackets. The following ACO PIPE® mounting/fastening options are available:

  • pipe support bracket with rubber in-fill and threaded weld-on rod
  • pipe support bracket with rubber in-fill and AP set for axial fitting
  • pipe support bracket with rubber in-fill and stirrup

One (1) meter of ACO PIPE® stainless steel pipe, filled with water, weighs:

050 3.11 kg
075 6.18 kg
110 12.40 kg
125 15.8 kg
160 24.87 kg
200 38.72 kg

Working pressure 
ACO pipe system is designed to withstand operation pressure in accordance to EN 1124-4. See the chart below.

 DN D(D1) Working pressure Working pressure (with optional socket clamps) Negative working pressure
50 60 0,5 bar 2 bar -0,8 bar
60 75 0,5 bar 2 bar -0,8 bar
100 110 0,5 bar 2 bar -0,6 bar
125 125 0,5 bar 1 bar -0,6 bar
150 160 0,5 bar 1 bar -0,6 bar
200 200 0,5 bar N/A N/A

Seal material Data

EPDM Viton*
Water Resistance Acids Excellent Good
Chemical Resistance Acids Good Excellent
Bases Good Good
Solvent Resistance (20°C) Alcohol Good Good
Acetone Good Unsuitable
Benzene Unsatisfactory Good
Oil Resistance ASTM Oil No. 1 @ 20°C Fair Excellent
@ 100°C Unsatisfactory 150°C Excellent
ASTM Oil No. 3 @ 20°C Unsatisfactory Excellent
@ 100°C Unsatisfactory 150°C Excellent
Fuel Resistance ASTM Fuel B @ 20°C Unsatisfactory Excellent
Resistances Oxidation Excellent Outstanding
Ozone & Weathering Outstanding Outstanding
Heat Resistance Maximum Continuous 130°C 205°C
Maximum Intermittent 150°C 300°C
Low Temperature Resistance -50°C -20°C
Gas Permeability Fairly Low Very Low
Physical Strenght Good Good
Compession Set Resistance Good Good
Tear & Abrasion Resistance Good Good
Cost Factor (1=low) 1 20

* Du Pont Registered Trade Mark                            


Vacuum system transport pockets

Transport pockets need to be provided at regular intervals to allow the liquid plug to reform.

Horizontal runs

Diameter (mm) Max distance between brackets (m)
50 2,2
75 2,5
110 2,8
125 3,0
160 3,3
200 3,3

Vertical runs

  • max. distance of brackets 3 meters
  • every inlet (branch) must be additionally fixed