The gas & oil pipelines usually go through complex geological structures and changeable climate zones. The geological structure changes caused by different climate, soil corrosion as well as the displacement and deformation which will greatly damage the buried pipelines. STWD9517 gas & oil pipeline special spray polyurethane coating has excellent comprehensive physical and stable anticorrosion properties which has gained great comment from the designers and applicators and then promoted it into more projects of gas & oil
pipelines. STWD
Urethane Co., USA developed
gas & oil
pipeline special rigid polyurethane
coating
early in the 1970s and has been successfully applied in many areas
of the USA.
Characteristics
It is high reactive and rapid curing and able to be sprayed forming on any bent
surfaces of slopes and vertical side without sagging or falling down problems. The coating film is dense tough, flexible and not sensitive to humidity and temperature, high adhesive strength with substrate and cathodic disbondment resistant. It has excellent properties of anticorrosion, impact
resistance
and wearable, stable chemical resistance with acid, alkali and salt and effective resistance erosion of microorganism and plant roots without
crack or peel off after long-term application.
Technical parameter
Specific gravity of part A
1.20
Specific gravity of part A
1.05
Viscosity of part A (23ºC)
800-1000 mPa.S
Viscosity of part B (23ºC)
700-800 mPa.S
Solid content
≥98%
Temperature heated of part A
60-65ºC
Temperature heated of part B
60-65ºC
Temperature heated of hoses
60-65ºC
Static pressure of part A
2200-2500PSI
Static pressure of part B
2200-2500PSI
Allowed pressure difference of A & B
≤300 PSI
Gel time
35S
Surface dry time
70S
Re-spray time
≤20
minutes (roughen the surface if exceed 20 minutes)
Physical properties
The gas & oil pipelines usually go through complex geological structures and changeable climate zones. The geological structure changes caused by different climate, soil corrosion as well as the displacement and deformation which will greatly damage the buried pipelines. STWD9517 gas & oil pipeline special spray polyurethane coating has excellent comprehensive physical and stable anticorrosion properties which has gained great comment from the designers and applicators and then promoted it into more projects of gas & oil
pipelines. STWD
Urethane Co., USA developed
gas & oil
pipeline special rigid polyurethane
coating
early in the 1970s and has been successfully applied in many areas
of the USA.Characteristics
It is high reactive and rapid curing and able to be sprayed forming on any bent
surfaces of slopes and vertical side without sagging or falling down problems. The coating film is dense tough, flexible and not sensitive to humidity and temperature, high adhesive strength with substrate and cathodic disbondment resistant. It has excellent properties of anticorrosion, impact
resistance
and wearable, stable chemical resistance with acid, alkali and salt and effective resistance erosion of microorganism and plant roots without
crack or peel off after long-term application.Technical parameterSpecific gravity of part A
1.20Specific gravity of part A
1.05Viscosity of part A (23ºC)
800-1000 mPa.SViscosity of part B (23ºC)
700-800 mPa.SSolid content
≥98%Temperature heated of part A
60-65ºCTemperature heated of part B
60-65ºCTemperature heated of hoses
60-65ºCStatic pressure of part A
2200-2500PSIStatic pressure of part B
2200-2500PSIAllowed pressure difference of A & B
≤300 PSIGel time
35SSurface dry time
70SRe-spray time
≤20
minutes (roughen the surface if exceed 20 minutes)
Physical properties
Adhesive strength (ASTM D4541)
Sand-blasted surface with primer
13-15 MPa
Sand-blasted surface without primer
10-12MPa
Abrasion resistance(ASTM
D4060)
≤10mg
Cathodic disbonding resistance (ASTM
G95)
≤8mm
Impact resistance (ASTM
D2794)
≥10J
Salt spray test (ASTM B117)
2000h
Water absorption rate ASTM D570)
≤2%
Spark resistance test
(GB7993)
15000v/1mm
Temperature variation resistance (GB/T 9278)
+150---- -50ºC
Chemical resistance (ASTM D714)
Acid resistance: 30%
H2SO4, 30d
no rust, no bubbles, no peel off
Alkali resistance: 30%
NaOH, 30d
no rust, no bubbles, no peel off
Salt resistance: 50 g/L
NaCL,
30d
no rust, no bubbles, no peel off
Oil resistance
0# d iesel oil, oil, 30d
Salt resistance: 50 g/L NaCL, 30d
Application scopes
Anticorrosion protection of buried pipelines of gas & petrochemical industry and anticorrosion protection of bridge pier, pipeline coatings