External coatings

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 showing the result of the tests carried out and conformity of the coating/painting to the standards and/or customer requirements.

D’Amore & Lunardi S.p.A. supplies pipes for pipelines with the following protective coatings.

Temporary protective coating

Coating layer that protects the external surface of the pipe from oxidation with an outdoor duration of six months.

The coating is carried out by:

  • Sandblasting
  • Spraying
  • According to technical specifications

Inorganic zinc coating

Long life anti oxidation coating suitable for aboveground pipelines.

The coating is executed by:

  1. Sandblasting Sa 2 ½
  2. Spraying
  3. 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 soil.

The coating is carried out as follow:

  • Shotblasting 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 12068

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 the process is used for underground pipelines for water, gas, petrol. Carried out in accordance with UNI 10190, ASTM D 1000 or as per customer requests.

The coating is carried out by:

  • Sandblasting Sa 2 ½
  • Application of adhesive primer
  • Application of inner tape (usually black) with overwrapping requested by the customer (I. G. 50%)
  • Application of outer tape (usually black) with overwrapping requested by the customer (I. G. 50%).

Rivestimento polietilene a caldo a nastro o estruso UNI 9099, DIN 30670, ISO 21809

È il tipo di rivestimento maggiormente diffuso con elevata resistenza all’urto e all’abrasione, agli agenti chimici, atmosferici e con alta rigidità dielettrica. Viene eseguito in accordo alle norme UNI 9099 oppure DIN 30670 o altre richieste del cliente.

Il rivestimento è così eseguito:

  • Sandblasting Sa 2 ½
  • Hot application of three layers 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:

  • Shotblasting 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 showing the result of the tests carried out and conformity of the coating/painting to the standards and/or customer requirements.