Construction Technology for Insulation of Iron Pipe

Construction Technology for Insulation of Iron Pipe

1、 Construction preparation

1. Materials: Rock wool/aluminum silicate/polyurethane insulation layer, glass wool cloth, moisture-proof felt, galvanized iron sheet (0.5-1.2mm), stainless steel rivets, self-locking buckles, high and low temperature resistant sealant, insulation special straps.

2. Tools: tape measure, cutting machine, edge press, bending machine, rivet gun, angle grinder, wrench.

3. Conditions: The pipeline pressure test is qualified, the surface is dry, and there is no construction in harsh environments such as rain, snow, strong winds, and low temperatures.

2、 Step 1: Pipeline base treatment

1. Clean the surface dust, oil stains, welding slag, and debris of the pipeline.

2. Weld seams, protrusions, and sharp edges should be polished flat to prevent scratching the insulation layer.

3. Open air and corrosive environment pipelines should be constructed firstRust removal+brushing anti rust paintConstruction can only be carried out after it has dried completely.

3、 Step 2: Laying of insulation layer (core)

1. Select insulation materials according to pipeline temperature:

• High temperature steam pipeline: rock wool, aluminum silicate wool

• Room temperature/cold water pipeline: composite insulation cotton, polyurethane

2. The insulation pipe shell/insulation cotton tightly wraps around the pipeline,Misaligned installationThe gaps between the upper and lower layers should be staggered, and it is forbidden to sew them together.

3. Fill the splicing gaps tightly with insulation materials of the same type, leaving no voids.

4. Use galvanized iron wire and insulation straps to tie and fix in a circular manner, with spacing between them200～300mmThe binding points are evenly and firmly secured.

5. Cut off irregular insulation blocks at bends, tees, and valves, fit tightly and without exposure

4、 Step ThreeConstruction Technology for Insulation of Iron PipeConstruction of moisture-proof layer

1. Wrap the insulation layer with moisture-proof felt or waterproof fiberglass cloth as a whole.

2. The lap width in both circumferential and longitudinal directions is ≥ 80-100mm,Press up and down, overlap smoothly.

3. Apply waterproof adhesive or wrap aluminum foil tape around the overlapping area for sealing, to prevent rainwater and moisture from infiltrating the insulation layer, and to prevent moisture from powdering and falling off.

5、 Step 4: Installation of Iron Sheet Protective Layer

1. Iron sheet cutting: Calculate the circumference based on the outer diameter of the pipeline and the insulation thickness, and reserve the overlap amount.

2. The edge of the iron sheet is pressed and bent to increase the sealing of the bite.

3. Straight pipe iron sheet wrapping:

• Leave longitudinal seamsBelow the pipeline sideAvoid the water facing surface;

• Longitudinal overlap ≥ 50mm, circumferential overlap ≥ 50mm;

4. Fixed method:

• Blind rivets/stainless steel buckle fixation, spacing150～200mm；

• The distance between the rivet and the edge of the iron sheet shall not be less than 15mm to prevent tearing.

5. Upper and lower pipeline interfaces:The upper iron sheet presses the lower iron sheetFollow the direction of water flow to prevent rainwater from pouring back.

6、 Step 5: Process of Alien Components

1. elbowUsing shrimp waist segmented cutting and splicing, the curvature is smooth and the seams are tight.

2. three-wayThe supervisor and branch pipes are cut separately, tightly sealed, and reinforced with rivets for fixation.

3. Flanges and valvesIndependently make detachable iron sheet protective covers for easy maintenance in the later stage.

4. Passing through walls and floorsIron sheet is used for flanging and closing, and sealant is used to seal the gaps.

7、 Step 6: Overall sealing treatment

1. All iron sheet joint seams, rivet holes, corner gaps, and punchingweather-resistant sealant.

2. The glue line is continuous and full, without broken glue or bubbles, to prevent water seepage and rust.

3. Outdoor pipelines, corrosive environments in chemical plants, and iron sheet surfaces can be repainted with anti-corrosion paint to extend their lifespan.

8、 Step 7: Finished product acceptance

1. Insulation layer: no hollowing, no looseness, no detachment, and filled gaps.

2. Iron layer: flat and beautiful, firmly fixed, without raised edges or damage.

3. Waterproof: All overlaps and seams are sealed completely without any water leakage hazards.

4. Clean up the site and ensure proper protection of finished products.