External coatings.

The internal and external coatings of the pipe protect it from corrosion and prevent chemical and mechanical interactions with the pipeline walls. The effectiveness and quality of the coating determines the quality and reliability of the pipe over time. D'Amore & Lunardi S.p.A. supplies pipes for pipelines with the following protective coatings:

External coating

Temporary protective coating.

Coating layer that protects the external surface of the pipe from oxidation with a duration, outdoors, of six months. The coating is executed by:

  • Shot-blasting.
  • Spraying.
  • According to technical specifications.
  • Inorganic zinc coating.

    Long life anti oxidation coating suitable for aboveground pipelines. The coating is executed by:

  • Shot-blasting Sa 2 ½.
  • Spraying.
  • According to technical specifications and/or customer’s requirements.
  • Bituminous coating UNI ISO 5256.

    It’s the odest kind of coating but commonly used today for water pipelines, gas distribution on the rough ground and underground waterlogged, corrosive and saline ambient. The coating is carried out as follow:

  • Shot-blasting Sa 2 ½.
  • Spray application of bituminous primer and air-dried.
  • Application of hot-bitumen filled up to 30% with inert mineral powder.
  • Spiral wrapping with one or two fiberglass bands impregnated on both sides with the same bitumen mix.
  • Sprinkling of lime hydrate film for protection against the solar radiation.

  • Polyethylene coating with cold tapes UNI 10190

    Typical coating for small quantities having the technical characteristics of high dielectric strength, high chemical resistance to acids and high resistance to cathode disbanding. The joints are easy to restore and it is used for underground pipelines for water, gas, petrol. Executed in accordance with UNI 10190, ASTM D 1000 or any other customer requests. The coating is executed by:

  • Shot-blasting Sa 2 ½.
  • Application of adhesive primer.
  • Application of inner tape (usually black) with overwrapping requested by the customer (i.e. 50%).
  • Application of outer tape (usually black) with overwrapping requested by the customer (i.e. 50%).

  • Polyethylene coating with hot tapes or extruded UNI 9099 and/or DIN 30670

    Most popular coating with a high resistance to knocks and abrasion, to chemical and atmospheric agents with high dielectric strength. Executed in accordance with UNI 9099 and/or DIN 30670 or any other customer request. The coating is executed by:

  • Shot-blasting Sa 2 ½.
  • Hot application of the three layer of:
  • - Epoxy resin primer.
    - Adhesive.
    - Polyethylene layer (extruded or sideband).

    Hight thickness polyurethane coating EN 10290

    Part of a family of new generation two-component coatings (base+catalyst), with high resistance to impact, abrasion, chemical and atmospheric agents, high dielectric strength and high resistance to thermal excursion.

  • Executed according to EN 10290.
  • If applied with thickness 500 ÷ 800 μ it is a valid alternative to bituminous coating.
  • If applied with thickness 1000 ÷ 1800 μ it is a valid alternative to the most modern polyethylene coatings (Polypropylene, FBE epoxy powders).
  • If applied with thickness 1200 μ it is an excellent substitute to triple-layer polyethylene.
  • The wide range of available colors is ideal for pipelines with low environmental impact. It can also be used for underground lines and lines submerged in freshwater or seawater.
  • Easy-to-repair (as it is a single-layer coating) using specific kits available on the market.
  • Easy-to-coat joints with the same product used to coat the pipes or with thermo-retractable couplings.

  • The coating is executed as follows:

  • Shot-blasting Sa 2 ½.
  • Application of the product in one or more layers with air-less spray to reach the minimum thickness required.

    Gunite coating

    Used for underwater pipelines, it is applied according to customer requirements.
    Applied by concrete overweighting to 60 mm. thickness with interior steel wire reinforcement and anticorrosion protection.

    Controls and certifications

    All coating operations are monitored during the different stages of the production process as required by the reference standards and technical specifications of the products used. At the end of the production cycle and before shipment the certificates are issued bearing the result of the tests carried out and conformity of the coating/painting to the standards and/or customer requirements.