A lining of anti-corrosion construction material selected benchmark This site is exposed to high temperature gas, the lining material must meet the following conditions:
Thermal shock resistance: Heat resistance when the gas temperature is 130°C to 140°C (every time: 180°C).
For heat resistance, a flake lining material having a vinyl resin of excellent heat resistance as a base resin is used. Vinyl resin is an internationally recognized highly corrosion-resistant resin, which has been widely used in ships, yachts and other industries. Its performance has also been confirmed by many parties. As people's research progresses, the field of application of vinyl resins is also constantly expanding, and emerging applications continue to emerge. 901 vinyl resin high-performance, standard product performance indicators:
Appearance brown yellow clear liquid density 1.04±0.01
Viscosity 450±100 cps (LVT#3-60rpm/25°C)
Solid content 55±1%kg/L
Gelation time: 15-25 minutes (55% MEKPO: 1.2%, 6% cobalt octoate: 0.4%, 100% DMA: 0.05%, temperature: 25°C water bath)
Shelf life: 9 months (below 25°C)
However, FRP is required to reinforce the joints in corners, support frames, and flanges, etc., taking into account the damage to the linings due to vibration during connection and use.
Material selection: Manufacturers designated by Party A.
Second liner construction method 1 Inspect the lined tank Prior to construction of the lining, make a checklist of the tank to check the smoothness of the lined equipment.
Check whether the weld is fully connected (with or without welding).
Check the weld for defects such as undercuts (depth 0.5 mm or more), sand holes (φ5 mm × 0.5 mm or more), and cracks.
Check the inside of the lining for welding spatters, scars, etc.
Check whether the welds in the corners are polished and whether proper groove is used (recess 10R, protrusion 3R or more). According to the drawings and the company's internal inspection regulations, check whether there are other matters that hinder the lining.
2 Set up scaffolding According to scaffolding construction essentials, build scaffolding from considerations of feasibility and safety of lining construction. Build a scaffold to set up a lifting device.
Above 900mm scaffolding should be set mid-range.
Scaffolds strive for simplicity and clarity to ensure safety.
(3) Sandblasting Blasting removes foreign materials such as rust and scale on the inner surface of the lining, and also increases the adhesive strength between the lining material and the lining material.
Before blasting, confirm that the humidity is below 85% or no condensation occurs.
Use fully dried quartz sand or iron ore.
The blasting standard is Sa2.5 or more.
After blasting, clean it to remove dust.
No need for lining parts to be protected in advance.
4 brush primer The primer should be painted as soon as possible after sandblasting, the latest must be completed within one day after sandblasting (after brushing to confirm whether there is siltation, sagging or uneven thickness caused by changes in gloss, etc.)
1) Primer (primer)
Resin coating: modified VEGF vinyl resin flake resin coating additives: including curing speed adjustment reagents, temperature-resistant and fire-resistant components, tougheners, inorganic pigments, etc.
The primer must be applied as soon as possible after sandblasting and must be completed at least one day after sandblasting.
The primer and hardener are mixed in a prescribed ratio and uniformly coated with a roller or a brush.
After brushing, check whether there is any deposit, sag, or gloss change caused by uneven thickness.
2) Middle antiseptic plaster smear (scale clay)
The thickness of a wipe is about 1mm at a time, generally it is completed in two stages, and the subsequent process is performed after the previous layer is dry. (usually one day interval)
When smearing, hold the knife at a certain angle with the base layer, push the wipe at an acute angle along the sharp corner of the knife, squeeze out the cement and basic bubbles as much as possible, and apply it in one direction.
Resin: VEGF vinyl resin flake reinforced material: heat-resistant refractory composition, glass flake - C glass, 3μm thick filler: silica, various inorganic pigments and other additives: including curing rate modifier, glass surface treatment agent, viscosity adjustment Agents, etc. 3) Brush finish, (1-2) Road finish resin: VEGF vinyl resin flake resin Additives: Including curing rate modifiers, heat-resistant refractory components, viscosity modifiers, inorganic pigments, surface hardening accelerators, etc. Take over the lining construction For the 25A~150A takeover, use the following method to construct the FRP molding insert tube.
After inserting the scale on the outside of the insertion tube and the inside of the tube, the insertion tube is inserted into the tube.
After the lining material is fully hardened, the fixture for fixing the flange surface is taken.
FRP reinforced at the root of the inner joint.
1 Confirmation before Construction of the First Flake Lining Construction • Humidity is below 85% or no condensation occurs. The following rainy days need to take corresponding measures.
• Make sure that dust or other foreign matter adheres to the inside of the lining after brushing.
Blending of lining materials • Hardeners are blended in a prescribed ratio.
• After mixing, stir thoroughly with a handheld mixer.
Lining Construction Tips • Use mud trowel and roller for construction to ensure that the average thickness is 1mm.
• Dip a small amount of styrene with a roller and gently roll the coated scale to adjust the surface.
2 In the middle of the first sliver lining inspection After the first squama is sufficiently hardened, perform the following intermediate inspection visual inspection:
Visually and finger-touching checks confirmed that there were no defects such as blisters, scars, sagging marks, irregularities, and poor hardening. Leakage inspection, using a high-voltage low-frequency electric spark detector to fully scan the lining, to confirm no leakage defects. Check voltage is 4000V (1mm).
Thickness check:
Use a magnet or electromagnetic thickness gauge to check the thickness of the liner every 2 places.
Treatment of non-conformities:
·Thickness must be made up to the thickness.
• The convex portion, surface flaws, sagging marks, air bubbles, etc. are ground with a grinder while ensuring that the thickness is not lower than the minimum thickness.
• For leakage, bubbling, peeling, etc., remove the defective part and repair it according to the repair instructions.
3 Second layer lining construction 1) Confirmation before construction:
• The humidity is below 85% or no condensation occurs. The following rainy days need to take corresponding measures.
• Confirm the hardening state of the first scale.
Blending of lining material:
·Adjust according to the hardening agent addition regulations.
· Mix well.
Lining essentials:
• Use mud trowel and roller for construction. The average thickness must be 1mm.
• Use rollers to take a small amount of styrene and gently roll the inside of the liner to adjust the inside of the liner.
2) Intermediate inspection of the second lining The following intermediate inspection was performed after the second lamella had hardened.
3) Appearance Check Visually, with a touch, etc., check for defects such as blisters, scars, sagging, irregularities, and poor hardening.
4) Leakage Check Use a high-voltage leak detector to thoroughly scan the inside of the lining to check whether there is any hole defect. Check voltage is 8000V (2mm).
5) Check the thickness Use a magnet or electromagnetic thickness gauge to confirm the thickness of the backing layer at every 2 places. The minimum thickness is 1.5mm.
6) Disposal of non-conformities:
• To make up for the lack of thickness.
• The convex, surface flaws, sagging, air bubbles, etc., are smoothed and polished at a thickness no less than the minimum thickness standard. • For leakage, bubbling, peeling, etc., remove the defects and repair them according to the repair instructions.
Four FRP Lining Construction 1. After the end of the scale lining (except for the outer coat), FRP construction is performed in the following way on the concavo-convex parts such as the pipe joint and the manhole.
• Brush the surface of the resin layer with a brush or roller.
• Apply a layer of glass cloth immediately after brushing the resin layer, and be careful not to form creases. Deaerate the deaerating roller to allow the resin to fully impregnate the glass cloth.
• Line up the second glass cloth in the same way.
• The glass cloth is lined with a layer of glass mat again, taking care that the resin does not wrinkle fully.
2. Final inspection 1) Visual inspection:
Visually and fingertips check for defects such as blisters, scars, sagging, bumps, and poor hardening.
2) Leakage check:
Fully scan the inside of the lining (with a speed of 300-500mm/s) using a high-voltage leakage detector to confirm that there is no hole defect. (Check voltage: 4000V/mm).
3) Thickness check:
Use a magnet or electromagnetic thickness gauge to confirm the thickness of the liner layer at every 2 locations. The reference thickness is 2mm. Must not be less than 1.5mm.
4) Check-in check:
Use a hammer to knock inside the lining and confirm that there is no bubbling or lining in the lining, based on no abnormal sound.
3. The outer coating is checked for leakage, thickness, and appearance according to the inspection method. After all passes, apply a brush or roller overcoat. Pay attention to uniform brushing.
Five-liner construction safety standards 1) During sandblasting, adhesive application and lining, it is necessary to ensure good ventilation in the flue.
2) The materials, primer, and solvent used in the scale lining are all flammable materials. Smoking, welding, and hot work should be prohibited around the lining construction site, above, and in the material warehouse, and clearly indicate “no smokingâ€.
3) Wear a gas mask when applying a primer or the like.
4) Safety should be ensured when building scaffolds.
5) Safety helmets must be worn when entering the construction site, and seat belts must be used for aerial work.
6) Wear protective clothing when sandblasting.
The Six Quality Policy implements the company's quality policy of "regulating enterprise management, meeting customer requirements, continuously improving quality, and progressing through science and technology."
Seven quality goals:
Guaranteed to meet the eligibility criteria required by the owner and strive for excellence.
Eight Quality Assurance Technical Measures 1. Strengthen the quality assurance system 1.1. Adhere to the whole process control with the quality of the project entity as the core, establish and improve the quality assurance system of the project and on-site process quality control, and enhance its operational effectiveness.
1.2. The project manager is fully responsible for quality. A quality leadership team headed by the project manager is established. Quality inspection personnel are responsible for conducting self-inspection of all concealed works during construction. After the self-inspection passes, the supervision engineer is notified in written form. The contents of the acceptance, the acceptance time and the location should be indicated. After the supervision engineer has passed the inspection and signed the acceptance record, it can enter the next process.
1.3. Strengthen the control and management of the entire process of project quality formation, strictly control construction preparation, material procurement, testing and inspection, and construction process control. At the same time, do a good job in inspection, acceptance and return visits and warranty work to ensure satisfactory service for the owner.
1.4. Convene quality meetings regularly to improve the "quality consciousness" of all construction workers.
1.5. Full-time quality inspectors are responsible for the overall monitoring of the quality of the construction process. Each process is assigned a person responsible for quality, strict implementation of the "three inspections" system during construction to ensure that the project meets the design requirements.
Nine to strengthen the management of construction technology 1. Actively participate in the design and submission of various professional organizations organized by the owners at various stages, carefully organize the construction drawings to be reviewed and implemented at the design referral meeting.
2. Before the start of construction, the project manager will organize all the construction personnel to provide technical disclosure. During the construction process, the technician will provide technical disclosure of the various processes in the key part of the construction process, explaining the construction methods, technical requirements, and quality standards.
3. Respect and obey the supervising engineer's supervision and management of the whole process of the project, and strictly follow the construction drawings, technical specifications and requirements of the bidding documents to organize the construction. Modification of design or material substitution must first be submitted to the supervision engineer for a change application. After being checked by the supervision engineer and approved according to the procedure, the construction unit shall implement the change plan and the change request. The design content may not be changed without the consent of the supervision engineer or the designer.
4. According to the construction characteristics of this project, according to the design drawings, technical specifications and contractual requirements before the start of the project, a detailed project quality plan shall be prepared to guide the construction in order to ensure the quality objectives are achieved.
5. Do a good job in the inspection and assessment of project quality, find problems in a timely manner, do not meet the requirements of the construction technical specifications must be reworked according to design requirements, with the progress of various processes in a timely manner to do a good job in the quality of sub-items, divisions, and unit projects Records, and collected by the full-time staff and organize and save, and do a good job at the collection and preservation of all materials, equipment qualification certificates and test reports, to ensure that the completion of the information is detailed and complete.
10. Strengthen the quality of raw materials and inspection work 1. All materials and equipment used in the project shall enter the market, must have a certificate of conformity (material list) and be accepted by the on-site material member (inspector of quality inspection), and be retested according to the specifications before use. The qualified certificate and retest report must be confirmed by the site supervision engineer before allowing the materials and equipment to be used in the project. The various main materials shall be identified and the traceability requirements shall be met.
2. The on-site use of inspection and measurement instruments and equipment must comply with relevant technical requirements. Within the validity period, entry construction equipment such as air compressors, arc spray guns, etc. shall be intact, and the quantity and performance shall meet construction schedule and quality requirements.
3. To standardize the acceptance and acceptance system for raw materials, raw materials, finished products and semi-finished products such as aluminum wire and closed coating must have material lists, certificates of conformity, and prohibition of the entry of inferior materials. After the qualified materials enter the site, the material personnel must do a good job of materials. Logo work.
4. Do a good job in quality control and prevention. Before the sub-projects and sub-projects are started, organize technical personnel and construction teams to formulate preventive measures and organize implementation.
5. Set process quality control points, strengthen process quality control, and strictly control personnel, materials, machinery, construction methods and environment during construction. After the successful bid, according to the project construction content, on-site construction conditions and design, owner's and supervision requirements, the process quality control points shall be prepared, including the control content, control standards, inspection tools, executive personnel, and relevant technical requirements for the process control points.
6, do a good job in process handover and finished product protection 6.1 Before the process handover, the quality of the previous process must meet the design requirements, construction and acceptance specifications and project quality inspection and evaluation standards, and reported to the supervision engineer.
6.2 Before concealed projects are concealed, they must be signed and approved by the owner’s representative or supervisor. If the concealed project is qualified for inspection, they can enter the next process.
6.3. Process results and protection of finished products The relevant standards and standards are strictly implemented.
Thermal shock resistance: Heat resistance when the gas temperature is 130°C to 140°C (every time: 180°C).
For heat resistance, a flake lining material having a vinyl resin of excellent heat resistance as a base resin is used. Vinyl resin is an internationally recognized highly corrosion-resistant resin, which has been widely used in ships, yachts and other industries. Its performance has also been confirmed by many parties. As people's research progresses, the field of application of vinyl resins is also constantly expanding, and emerging applications continue to emerge. 901 vinyl resin high-performance, standard product performance indicators:
Appearance brown yellow clear liquid density 1.04±0.01
Viscosity 450±100 cps (LVT#3-60rpm/25°C)
Solid content 55±1%kg/L
Gelation time: 15-25 minutes (55% MEKPO: 1.2%, 6% cobalt octoate: 0.4%, 100% DMA: 0.05%, temperature: 25°C water bath)
Shelf life: 9 months (below 25°C)
However, FRP is required to reinforce the joints in corners, support frames, and flanges, etc., taking into account the damage to the linings due to vibration during connection and use.
Material selection: Manufacturers designated by Party A.
Second liner construction method 1 Inspect the lined tank Prior to construction of the lining, make a checklist of the tank to check the smoothness of the lined equipment.
Check whether the weld is fully connected (with or without welding).
Check the weld for defects such as undercuts (depth 0.5 mm or more), sand holes (φ5 mm × 0.5 mm or more), and cracks.
Check the inside of the lining for welding spatters, scars, etc.
Check whether the welds in the corners are polished and whether proper groove is used (recess 10R, protrusion 3R or more). According to the drawings and the company's internal inspection regulations, check whether there are other matters that hinder the lining.
2 Set up scaffolding According to scaffolding construction essentials, build scaffolding from considerations of feasibility and safety of lining construction. Build a scaffold to set up a lifting device.
Above 900mm scaffolding should be set mid-range.
Scaffolds strive for simplicity and clarity to ensure safety.
(3) Sandblasting Blasting removes foreign materials such as rust and scale on the inner surface of the lining, and also increases the adhesive strength between the lining material and the lining material.
Before blasting, confirm that the humidity is below 85% or no condensation occurs.
Use fully dried quartz sand or iron ore.
The blasting standard is Sa2.5 or more.
After blasting, clean it to remove dust.
No need for lining parts to be protected in advance.
4 brush primer The primer should be painted as soon as possible after sandblasting, the latest must be completed within one day after sandblasting (after brushing to confirm whether there is siltation, sagging or uneven thickness caused by changes in gloss, etc.)
1) Primer (primer)
Resin coating: modified VEGF vinyl resin flake resin coating additives: including curing speed adjustment reagents, temperature-resistant and fire-resistant components, tougheners, inorganic pigments, etc.
The primer must be applied as soon as possible after sandblasting and must be completed at least one day after sandblasting.
The primer and hardener are mixed in a prescribed ratio and uniformly coated with a roller or a brush.
After brushing, check whether there is any deposit, sag, or gloss change caused by uneven thickness.
2) Middle antiseptic plaster smear (scale clay)
The thickness of a wipe is about 1mm at a time, generally it is completed in two stages, and the subsequent process is performed after the previous layer is dry. (usually one day interval)
When smearing, hold the knife at a certain angle with the base layer, push the wipe at an acute angle along the sharp corner of the knife, squeeze out the cement and basic bubbles as much as possible, and apply it in one direction.
Resin: VEGF vinyl resin flake reinforced material: heat-resistant refractory composition, glass flake - C glass, 3μm thick filler: silica, various inorganic pigments and other additives: including curing rate modifier, glass surface treatment agent, viscosity adjustment Agents, etc. 3) Brush finish, (1-2) Road finish resin: VEGF vinyl resin flake resin Additives: Including curing rate modifiers, heat-resistant refractory components, viscosity modifiers, inorganic pigments, surface hardening accelerators, etc. Take over the lining construction For the 25A~150A takeover, use the following method to construct the FRP molding insert tube.
After inserting the scale on the outside of the insertion tube and the inside of the tube, the insertion tube is inserted into the tube.
After the lining material is fully hardened, the fixture for fixing the flange surface is taken.
FRP reinforced at the root of the inner joint.
1 Confirmation before Construction of the First Flake Lining Construction • Humidity is below 85% or no condensation occurs. The following rainy days need to take corresponding measures.
• Make sure that dust or other foreign matter adheres to the inside of the lining after brushing.
Blending of lining materials • Hardeners are blended in a prescribed ratio.
• After mixing, stir thoroughly with a handheld mixer.
Lining Construction Tips • Use mud trowel and roller for construction to ensure that the average thickness is 1mm.
• Dip a small amount of styrene with a roller and gently roll the coated scale to adjust the surface.
2 In the middle of the first sliver lining inspection After the first squama is sufficiently hardened, perform the following intermediate inspection visual inspection:
Visually and finger-touching checks confirmed that there were no defects such as blisters, scars, sagging marks, irregularities, and poor hardening. Leakage inspection, using a high-voltage low-frequency electric spark detector to fully scan the lining, to confirm no leakage defects. Check voltage is 4000V (1mm).
Thickness check:
Use a magnet or electromagnetic thickness gauge to check the thickness of the liner every 2 places.
Treatment of non-conformities:
·Thickness must be made up to the thickness.
• The convex portion, surface flaws, sagging marks, air bubbles, etc. are ground with a grinder while ensuring that the thickness is not lower than the minimum thickness.
• For leakage, bubbling, peeling, etc., remove the defective part and repair it according to the repair instructions.
3 Second layer lining construction 1) Confirmation before construction:
• The humidity is below 85% or no condensation occurs. The following rainy days need to take corresponding measures.
• Confirm the hardening state of the first scale.
Blending of lining material:
·Adjust according to the hardening agent addition regulations.
· Mix well.
Lining essentials:
• Use mud trowel and roller for construction. The average thickness must be 1mm.
• Use rollers to take a small amount of styrene and gently roll the inside of the liner to adjust the inside of the liner.
2) Intermediate inspection of the second lining The following intermediate inspection was performed after the second lamella had hardened.
3) Appearance Check Visually, with a touch, etc., check for defects such as blisters, scars, sagging, irregularities, and poor hardening.
4) Leakage Check Use a high-voltage leak detector to thoroughly scan the inside of the lining to check whether there is any hole defect. Check voltage is 8000V (2mm).
5) Check the thickness Use a magnet or electromagnetic thickness gauge to confirm the thickness of the backing layer at every 2 places. The minimum thickness is 1.5mm.
6) Disposal of non-conformities:
• To make up for the lack of thickness.
• The convex, surface flaws, sagging, air bubbles, etc., are smoothed and polished at a thickness no less than the minimum thickness standard. • For leakage, bubbling, peeling, etc., remove the defects and repair them according to the repair instructions.
Four FRP Lining Construction 1. After the end of the scale lining (except for the outer coat), FRP construction is performed in the following way on the concavo-convex parts such as the pipe joint and the manhole.
• Brush the surface of the resin layer with a brush or roller.
• Apply a layer of glass cloth immediately after brushing the resin layer, and be careful not to form creases. Deaerate the deaerating roller to allow the resin to fully impregnate the glass cloth.
• Line up the second glass cloth in the same way.
• The glass cloth is lined with a layer of glass mat again, taking care that the resin does not wrinkle fully.
2. Final inspection 1) Visual inspection:
Visually and fingertips check for defects such as blisters, scars, sagging, bumps, and poor hardening.
2) Leakage check:
Fully scan the inside of the lining (with a speed of 300-500mm/s) using a high-voltage leakage detector to confirm that there is no hole defect. (Check voltage: 4000V/mm).
3) Thickness check:
Use a magnet or electromagnetic thickness gauge to confirm the thickness of the liner layer at every 2 locations. The reference thickness is 2mm. Must not be less than 1.5mm.
4) Check-in check:
Use a hammer to knock inside the lining and confirm that there is no bubbling or lining in the lining, based on no abnormal sound.
3. The outer coating is checked for leakage, thickness, and appearance according to the inspection method. After all passes, apply a brush or roller overcoat. Pay attention to uniform brushing.
Five-liner construction safety standards 1) During sandblasting, adhesive application and lining, it is necessary to ensure good ventilation in the flue.
2) The materials, primer, and solvent used in the scale lining are all flammable materials. Smoking, welding, and hot work should be prohibited around the lining construction site, above, and in the material warehouse, and clearly indicate “no smokingâ€.
3) Wear a gas mask when applying a primer or the like.
4) Safety should be ensured when building scaffolds.
5) Safety helmets must be worn when entering the construction site, and seat belts must be used for aerial work.
6) Wear protective clothing when sandblasting.
The Six Quality Policy implements the company's quality policy of "regulating enterprise management, meeting customer requirements, continuously improving quality, and progressing through science and technology."
Seven quality goals:
Guaranteed to meet the eligibility criteria required by the owner and strive for excellence.
Eight Quality Assurance Technical Measures 1. Strengthen the quality assurance system 1.1. Adhere to the whole process control with the quality of the project entity as the core, establish and improve the quality assurance system of the project and on-site process quality control, and enhance its operational effectiveness.
1.2. The project manager is fully responsible for quality. A quality leadership team headed by the project manager is established. Quality inspection personnel are responsible for conducting self-inspection of all concealed works during construction. After the self-inspection passes, the supervision engineer is notified in written form. The contents of the acceptance, the acceptance time and the location should be indicated. After the supervision engineer has passed the inspection and signed the acceptance record, it can enter the next process.
1.3. Strengthen the control and management of the entire process of project quality formation, strictly control construction preparation, material procurement, testing and inspection, and construction process control. At the same time, do a good job in inspection, acceptance and return visits and warranty work to ensure satisfactory service for the owner.
1.4. Convene quality meetings regularly to improve the "quality consciousness" of all construction workers.
1.5. Full-time quality inspectors are responsible for the overall monitoring of the quality of the construction process. Each process is assigned a person responsible for quality, strict implementation of the "three inspections" system during construction to ensure that the project meets the design requirements.
Nine to strengthen the management of construction technology 1. Actively participate in the design and submission of various professional organizations organized by the owners at various stages, carefully organize the construction drawings to be reviewed and implemented at the design referral meeting.
2. Before the start of construction, the project manager will organize all the construction personnel to provide technical disclosure. During the construction process, the technician will provide technical disclosure of the various processes in the key part of the construction process, explaining the construction methods, technical requirements, and quality standards.
3. Respect and obey the supervising engineer's supervision and management of the whole process of the project, and strictly follow the construction drawings, technical specifications and requirements of the bidding documents to organize the construction. Modification of design or material substitution must first be submitted to the supervision engineer for a change application. After being checked by the supervision engineer and approved according to the procedure, the construction unit shall implement the change plan and the change request. The design content may not be changed without the consent of the supervision engineer or the designer.
4. According to the construction characteristics of this project, according to the design drawings, technical specifications and contractual requirements before the start of the project, a detailed project quality plan shall be prepared to guide the construction in order to ensure the quality objectives are achieved.
5. Do a good job in the inspection and assessment of project quality, find problems in a timely manner, do not meet the requirements of the construction technical specifications must be reworked according to design requirements, with the progress of various processes in a timely manner to do a good job in the quality of sub-items, divisions, and unit projects Records, and collected by the full-time staff and organize and save, and do a good job at the collection and preservation of all materials, equipment qualification certificates and test reports, to ensure that the completion of the information is detailed and complete.
10. Strengthen the quality of raw materials and inspection work 1. All materials and equipment used in the project shall enter the market, must have a certificate of conformity (material list) and be accepted by the on-site material member (inspector of quality inspection), and be retested according to the specifications before use. The qualified certificate and retest report must be confirmed by the site supervision engineer before allowing the materials and equipment to be used in the project. The various main materials shall be identified and the traceability requirements shall be met.
2. The on-site use of inspection and measurement instruments and equipment must comply with relevant technical requirements. Within the validity period, entry construction equipment such as air compressors, arc spray guns, etc. shall be intact, and the quantity and performance shall meet construction schedule and quality requirements.
3. To standardize the acceptance and acceptance system for raw materials, raw materials, finished products and semi-finished products such as aluminum wire and closed coating must have material lists, certificates of conformity, and prohibition of the entry of inferior materials. After the qualified materials enter the site, the material personnel must do a good job of materials. Logo work.
4. Do a good job in quality control and prevention. Before the sub-projects and sub-projects are started, organize technical personnel and construction teams to formulate preventive measures and organize implementation.
5. Set process quality control points, strengthen process quality control, and strictly control personnel, materials, machinery, construction methods and environment during construction. After the successful bid, according to the project construction content, on-site construction conditions and design, owner's and supervision requirements, the process quality control points shall be prepared, including the control content, control standards, inspection tools, executive personnel, and relevant technical requirements for the process control points.
6, do a good job in process handover and finished product protection 6.1 Before the process handover, the quality of the previous process must meet the design requirements, construction and acceptance specifications and project quality inspection and evaluation standards, and reported to the supervision engineer.
6.2 Before concealed projects are concealed, they must be signed and approved by the owner’s representative or supervisor. If the concealed project is qualified for inspection, they can enter the next process.
6.3. Process results and protection of finished products The relevant standards and standards are strictly implemented.
Calcium Chloride, CaCl2,also named Calcium Chloride Anhydrous , Calcium Chloride Dihydrate 74%, Calcium Chloride 77%. is a common salt. It behaves as a typical ionic halide, and is solid at room temperature. It has several common applications such as brine for refrigeration plants, ice and dust control on roads, and in concrete. It can be produced directly from limestone, but large amounts are also produced as a by-product of the Solvay process. Because of its hygroscopic nature, it must be kept in tightly-sealed containers.
Specifications:
|
Test Item |
Specification |
Result |
|
Content of CaCl2 |
74%-77% |
|
|
NaCl |
≤4% |
3.10% |
|
MgCl2 |
≤0.5% |
0.12% |
|
Ca(OH)2 |
≤0.3% |
0.10% |
|
Sulphate Content (SO42- ) |
≤0.05% |
0.02% |
|
Water Insoluble |
≤0.2% |
0.10% |
|
Heavy metal(as Pb) |
≤10ppm |
Conforms |
|
Arsenic |
≤10ppm |
Conforms |
Product description:
|
Classification |
Chloride
Calcium |
Type: |
Calcium Chloride
|
CAS No.: |
10043-52-4 |
|
Other Names: |
Calcium Chloride |
MF: |
CaCl2 |
EINECS No.: |
233-140-8 |
|
Place of Origin: |
Shandong
China |
Grade Standard: |
Food Grade, Industrial Grade,
Medicine
Grade,
|
Purity:
|
74%-77% 94%-96%
|
|
Appearance |
white powder,
granular, |
Application |
agriculture,
industrial, |
Brand Name: |
XINCHANG
|
Usage:
1. Used in highway, expressway, parking lot and port and as a dryer to dry nitrogen, oxygen, hydrogen, hydrogen chloride and sulfur dioxide etc.
2. Act as dehydration agent when producing alcohol, ester, ether and acrylic acid.
3. Calcium chloride is a kind of important cryogen used by freezing machine and when making ice.
4. It can increase hardness of concrete and increase cold resistance ability of the construction.
5. In port, acts as fog removing agent and dust collecting agent on road and fireproof agent of textile and acts as a protective agent and refining agent used in aluminum magnesium metallurgy.
6. Act as precipitator in producing lake paint. It is a kind of raw material of producing calcium salt. In algae sodium and bean industry it acts as flocculation.
7.Used for oil drilling.
Calcium Chloride
Calcium Chloride,Calcium Chloride Powder,Calcium Chloride Granular,Anhydrous Calcium Chloride
Weifang Xinchang Chemical Co.,Ltd , http://www.xinchangchem.com