Cement Mortar Lining Steel Pipe

Cement mortar lined anti-corrosion pipeline is an anti-corrosion technology used on the inner wall of steel pipes. It is mainly used in pipeline systems such as water supply, heating network heating, tap water engineering, gas transportation, and underground water transportation.

Cement mortar lined anti-corrosion pipeline is an anti-corrosion technology used on the inner wall of steel pipes. It is mainly used in pipeline systems such as water supply, heating network heating, tap water engineering, gas transportation, and underground water transportation. The following are some key features and construction points of cement mortar lined anti-corrosion pipelines:

Anti-corrosion effect: The cement mortar lining isolates the inner wall of the steel pipe from water or air, forming a dense protective layer, thereby inhibiting the oxidation and corrosion scaling of the inner wall of the steel pipe.

Construction method: The anti-corrosion layer in the cement mortar can be constructed by mechanical spraying, manual troweling, dragging or centrifugal prefabrication.

Material requirements: The cement used for the lining should be Portland cement, ordinary Portland cement and slag Portland cement. The river sand particles should be hard, clean and well graded. The sand should contain soil, mica, organic impurities and other harmful substances. The total weight should not exceed 2% of the total weight.

Construction preparation: Before construction, the inner wall of the pipe must be cleaned, and the newly buried pipeline soil, welding slag, dirt and other attachments must be removed. During the lining construction, there must be no condensation or water accumulation on the inner wall of the pipe.

Staffing: According to the site conditions and the project construction schedule, personnel, machines and equipment should be prepared in place. A team of 8 people will be arranged for each working surface, including team leader, safety officer, operator, mortar mixer, mortar transporter and plasterer. Ordinary work.

Machinery and equipment: Machinery and equipment required for construction include horizontal mixers, hanging slurry hoppers, shotcrete machines, wearing parts, mobile impurity removers, ventilators and oxygen measuring equipment.

Construction specifications: Cement mortar must be fully mixed by machinery. The consistency of the mortar should meet the homogeneous and dense requirements of the lining. The weight ratio and compressive strength of the cement mortar should meet certain standards.

Maintenance and repair: After the lining cement mortar reaches final setting, it must be watered and cured immediately to keep the lining moist. Unqualified surface defects, cracks, hollows, etc. must be carefully repaired.

Acceptance criteria: Cracks in the cement mortar lining caused by shrinkage do not need to be repaired when their width is less than or equal to 1.6mm, and the length along the axial direction of the pipe is not greater than the circumferential length of the pipe and is not greater than 5m. When the crack width is greater than 1.6mm, if the crack can heal automatically after intensive maintenance, it can be considered qualified.

Scope of application: Cement mortar lined anti-corrosion pipes are suitable for process pipelines transporting corrosive media in petroleum pipelines, chemical pharmaceuticals, printing and dyeing and other industries, sewage treatment discharge pipes, sewage pipes and biological pool anti-corrosion projects, agricultural irrigation pipes, deep well pipes, drainage Guan et al.

In summary, cement mortar lined anti-corrosion pipelines have been widely used in many fields due to their good anti-corrosion effect, ease of construction and high cost performance.