Insulation of pipe and components technology

1 scope

This technology is applicable for industrial and civil construction, ventilation, air conditioning system and air cleaning systems, industrial plants in general air duct insulation, ventilation system works.

2 construction preparation

Requirements 2.1 materials and equipment:

2.1.1 the thermal insulation material used to have a factory certificate and with the relevant authorities of certification and related legal proof of the detection unit.

2.1.2 use of insulating material shall conform to the design parameters of air-conditioning requirements and fire code requirements, as follows:

L. design parameters: coefficient of thermal conductivity for 0.022~0.047W/m · K, (glass wool or felt)

Thermal conductivity for 0.042~0.064W/m · K (rock wool or felt)

2. flammability: non-combustible or flame retardant.

2.1.3 there are generally two types of commonly used insulation materials:

1. fiber-like: rock wool, aluminium foil rock wool Board, Superfine glass wool blanket, aluminum foil glass wool board.

2. porous: self-extinguishing polystyrene foam, mineral wool, polyurethane foam insulation.

2.1.4 insulation subsidiary materials: glass fiber cloth, fire retardant paint, adhesive, metal, heat preservation nails, should comply with the design requirements and related regulations.

2.1.5 circular saws or slab saws, hand saws, holding the knife, steel ruler, package box feet, hair brush, pliers, etc.

2.2 operating conditions:

2.2.1 field civil engineering structures have been completed, without massive construction of water occurs.

2.2.2 wind pipe, part installation quality meets quality standards, antiseptic parts needed for a good paint job.

2.2.3 insulation works or outdoor construction freeze in winter and rain protection measures.

2.2.4 wind pipe, components and equipment insulation engineering construction in duct system leakage test and inspection after qualifying.

3 operational processes

3.1 process:

Adhesive insulation internal insulation → test

Hidden check picking → → → → Pu covered with plastic insulation material polystyrene Board insulation

Insulation material unloading rock cotton insulation

→ → → Wrapped fiber glass fabric brush fire retardant coating → outdoor insulation plus metal shell testing

3.2 insulation material to be exact, cut face to flush cutting to make horizontal, vertical, patched on short big top at the ends (Figure 4-23).

3.3 bonding thermal insulation duct walls before nailing on the dust, wipe oil, apply adhesive respectively in the pipe wall and insulation bonding surface of the nail, glue it again at a later time.

3.4 rectangular air pipe and equipment insulation nail density should be uniformly distributed, bottom surface of not less than 16 per square metre, laterally not less than 10, the top surface of not less than 6. Insulation nail glue should be 12~24h after after then covered with insulation material.

3.5 insulation materials cover longitudinal and transverse joints should be staggered (Figure 4-24).

Small pieces of insulation material should be paved covered in horizontal plane.

Rock wool insulation between each take the figure 4-25 approach head.

3.6 types of insulation material practices:

3.6.1 internal insulation. Cotton insulation materials such as rocks, and post-should apply on the flange insulation material section fixing glue, prevent fibers from being blown up. Rock wool should be coated with a coating on the inner surface.

3.6.2 polystyrene Board insulation. Once polystyrene banpu, put iron short angle in the corners, and then with a thin steel band for hoop, packing clamp clamp. Steel clamps every 500mm together (Figure 4-26).

3.6.3 rock cotton insulation. Exposed pipe insulation should be added at the corner bar iron bag corner, wrapped with glass cloth.

3.7 wrapped glass fiber cloth. Twists make it overlap each other, so that the insulation material appearance form two layers of glass cloth winding

(Figure 4-27).

Glass fiber cloth head to clamp firmly or glue stick.

3.8 glass fiber cloth brush two fire-retardant coating on the outer surface, coating should be tight uniform.

3.9 outdoor Lomond duct insulation should also be coupled with a layer of metal shell, shell at the overlap between the rivet fixed seam sealed with PuTTY.

4 quality criteria

4.1 project:

4.1.1 the insulation materials, specifications and fire resistance design and fire protection requirements must be met. Electric heaters and 800mm range of duct insulation with non-burning materials. To examine certificates of material or combustion.

Inspection method: observation of check and check the material certificate or a test.

4.1.2 air ducts and air conditioning equipment, as well as condensate parts produced, must be well insulated, tight and seamless.

Inspection method: Visual check.

4.2 Basic project:

4.2.1 the use of bonding materials of insulation shall comply with the following requirements:

Paste a solid, filled full, dense seam adhesive materials, seams even tidy, neat, vertical joints staggered.

Inspection method: observation and hand check.

4.2. the 2-volume, bulk insulation material should be close to surface, solid bandage, elastic moderation, bulk material not exposed, the surface smooth.

Inspection method: Visual check.

4.2.3 glass fiber cloth, plastic protective layer elastic moderate, lap width of uniform, smooth appearance.

Inspection method: Visual check.

4.2.4 thin sheet metal cover should be set Parallel to the flow direction, width, and interfaces, and fixation, lap width of uniform appearance.

Inspection method: observation and standard checks.

After 4.2.5 insulation valve, open and close tags to clear, clear, beautiful, easy to operate.

Inspection method: Visual check.

4.3 allowable deviation:

Evenness of insulation, insulation thickness tolerances and inspection methods are given in table 4-26.

Flatness, thickness of insulation for thermal insulation layer method for the determination of tolerances and table 4-26

Project tolerance (mm) test method

Insulation surface flatness of coil or plate 5 1M ruler and the wedge-shaped feeler Gage check

Bulk material or soft materials 10

+0.10δ

-0.05 δ steel needles into the insulating layer and the standard checks

Note: δ for the thickness of insulation layer.

5 finished product protection

5.1 thermal insulation material stacked on site must have waterproofing measures, as far as possible be kept in warehouses or in aerial and ground covered with a waterproof material.

5.2 galvanized iron wire, glass fibre cloth, insulation nails and insulation adhesive material should be kept in a warehouse in the custody.

5.3 insulation material should be fair use, try to save material, call it is not exhausted when material should be brought back to custody or piled up without affecting the construction place, against loss and damage.

6 quality problems to be noticed

6.1 thermal insulation quality problems should be paid attention to in the process are shown in table 4-27.

Insulation quality problems should be paid attention to in the process table 4-27

Serial number control measures for common quality problems

1 insulation nail adhesive is not strong, resulting in heat preservation material shedding strictly according to technological requirements, operation, avoid the bump

2

Insulation insulation material appearance beauty crop to be exact, corner to add iron leather corner, glass cloth winding tension should be appropriate

3 glass of silk loosely woven glass fabric head to jail or glued

4 system insulation missing cover valve parts and connected with the end device parts are rigid insulation

7 quality records

7.1 project impression quality assessment form.

7.2 wind pipe and equipment insulation engineering quality inspection and evaluation form.

7.3 intermediate inspection records.

7.4 cover engineering and inspection record.

7.5 out of checking and cross-checking records.

7.6 Division engineering acceptance record.