K9 PU Ductile Iron Pipe Zinc Or FBE External DN 80 Mm - 2600mm
Polyurethane coating is made of bi-component polyurethane materials
to a scale, and not noly does it serve as the inner-lining material
of nodular cast iron pipe, but as related outer erosion resistant
coating. Polyurethane coating has many advantages such as wonderful
avrasive resistance, excellent corrosion resistance,
non-permeation, smooth surface, small resistance coefficient, few
volatile organic compound, remarkable environmental protection
property, etc. Some polyurethane coatings with a thickness above
900μm are mainly applied to transporting corrosive mediums or the
mediums with high sanitary condition, including soft water,
desalination seawater, municipal wastewater, industrial wastewater,
and others; and some with thickness above 700μm are mainly applied to the soil environment with strong corrosivity
such as the soil polluted by industrial wastewater or with low
factory applied coating which consists of polyurethane on the
outside of the pipe barrel and external socket.
specific coating resistance:
surface related electric resistance of the coating perpendicular to
the pipe wall.
test which is done once and is repeated according to a schedule or
after a relevant change of coating material and/or coating supplier
or change in process application.
test carried out to control the manufacturing process with a
frequency defined by the manufacturer.
Prior to application of the polyurethane coating, the surface of
the pipes shall be technically clean, free of rust, loose
constituent materials, dirt, oil, grease and moisture.
In cold weather, or anytime when moisture tends to condense on the
surface of the pipe, the pipe shall be uniformly warmed for a
sufficient time to dry the pipe prior to cleaning. The pipe
temperature shall be maintained at at least 5 °C above the dew
The surface shall be prepared by grit blasting and be in compliance
with level Sa 2.5 of EN ISO 8501-1. The surface roughness Ra, in
accordance with EN ISO 8503-1, shall be at least 10 micrometers
which is equivalent to an anchored profile, Rz of 50 micrometers or higher if required by the coating material
provider or manufacturer.
Appearance and continuity:
The polyurethane coating shall be:
- uniform in colour, except the spigot and the socket which may be of
a different colour for permitted marking;
- uniform appearance and smoothness except for admissible repairs;
- free of visible defects (pinholes, bubbles, blisters, wrinkles,
cracks or voids).
Slight superficial variations of colour or brilliance, due to
repairs or prolonged exposure to sunlight or contact with other
pipes are permissible.
The chemical resistance is determined by the change in weight of
the polyurethane coating. When tested in accordance to 7.2.1, the
weight increase and weight loss shall meet the requirements given
in Table 1 when compared to the original weight.
Table 1 — Weight change requirements
Mass change in deionised water,
100 days at 50 °C
EN ISO 62 method 2
Less than 15 % weight increase
100 days at 23 °C
|Less than 2 % weight loss|
Mass change in 10 % sulphuric acid,
100 days at 50 °C
Less than 10 % weight increase
100 days at 23 °C
|%||EN ISO 62 method 2||Less than 4 % weight loss|
Packing: bundled with steel belts or in bulk
Shipment: in bulk or container
Much of the production of ductile iron is in the form of ductile
cast iron pipe, used for water and sewer lines. Ductile cast iron pipe is stronger and easier to tap, requires less support and provides
greater flow area compared with pipes made from other materials
like PVC, concrete, polyethylene or steel. Ductile Iron Pipe is the
most widely-used pipeline product in water supply and water
There are lots of qualified managers and technicians, and a
well-trained team of after-sales service, which provides all
services of manufacture, package, transportation and installation.
We are looking forward to cooperating with friends from abroad and
home creating a brighter future.