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Fire retardant phosphate coating on steel. Technical requirements

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1 Document [ /22/3/204/ ]: GOST Fire-retardant phosphate coating on steel. Technical requirements GOST Fire-retardant phosphate coating on steel. Technical requirements 1.9. When transporting and storing structures at a relative air humidity of more than 75%, waterproofing should be applied to the coating surface (see clause 3.7 of the mandatory annex). APPLICATION of the protected surface in direction 4.5. Pressure compressed air and the pressure of liquid glass at the outlet of the gun is controlled using a pressure gauge in accordance with GOST Date of introduction The coating consists of the following components: asbestos, liquid glass and nepheline fire retardant. composition jets upward...no more than 500 mm 5. Safety precautions Adopting body: Gosstroy of the USSR 1.11. Component consumption per 1 is given in table. 3. coverage taking into account 10% production losses distance from the spray gun to 5.1. The work site must be equipped supply and exhaust ventilation. APPROVED AND ENTERED INTO EFFECT by the Decree of the USSR State Committee for Construction Affairs dated July 27, 1979 129 Table 3 1. Materials of the protected surface in direction 5.2. Persons applying the coating must be provided with the means personal protection: rubber gloves, respirators, safety glasses and thick overalls.

2 REPUBLICATION. March 1985 Name of component Asbestos Liquid glass with density = 1.2 Nepheline fire retardant Consumption per, kg 1.1. The materials used for coating must meet the requirements of paragraphs of this standard. jets of the composition in the horizontal direction This standard applies to phosphate fire retardant coating on steel, applied at the factory or construction site on steel structures to increase their fire resistance limit Coating component - chrysotile asbestos III-V grades semi-rigid grades P-Z-50, P-Z-70, P-5-50 and P-5-65 according to GOST Preparation of the coating composition and down. ..no more than 700 mm The standard establishes the basic requirements for the coating, components for its preparation and application technology. The moisture content of asbestos should not exceed 2% Preparation of the dry mixture In hard-to-reach places, the specified distances can be reduced to 200 mm. 1. REQUIREMENTS FOR COATING The coating component is potassium liquid glass with a module of 2.6-2.8 according to the normative technical documentation approved in in the prescribed manner, or sodium liquid glass with a module of 2.6-2.8 according to GOST Asbestos and nepheline fire retardant are weighed on weighing dispensers with an error of 1% by weight and mixed in a mixer continuous action When applying the coating composition to structures, you should also comply with the requirements of SNiP for finishing coatings building structures, finishing of the surface of the coating must be carried out in accordance with the design The coating should be used for fire protection steel structures, operated indoors with a non-aggressive environment and a relative air humidity of no more than 75%.

3 1.14. The coating component is nepheline flame retardant in the form of a fine powder according to the regulatory and technical documentation approved in the prescribed manner. The residue on sieve 018 according to GOST should be no more than 7%. Mixing time - at least 5 minutes When applying the coating composition, the ambient air temperature must be no lower than 5, air humidity - no higher than 75%, in addition, in the conditions of the construction site, the structures must be protected from precipitation. The coating must be applied in one layer in accordance with with the requirements given in the mandatory annex. Finishing of the coating is allowed paint and varnish materials Coating components must be supplied in metal barrels, plastic or paper bags and stored in accordance with the requirements of regulatory and technical documentation approved in the prescribed manner 2.2. Liquid glass is diluted hot water temperature no more than 80 with constant stirring for at least 3 minutes until density = 1, Drying of the coating should be carried out in natural conditions at an ambient temperature of not lower than 5 and humidity not higher than 75% for at least 48 hours Fire resistance limits of steel structures depending on the thickness of the coating layer are given in table COATING QUALITY CONTROL It is allowed to dilute liquid glass cold water temperature (20 5) subject to increasing the stirring time to 10 minutes. Diluted liquid glass is filtered through a 05 sieve according to GOST. Drying at a temperature of at least 5 hours is allowed. Table Finished coating shall be checked for compliance with the requirements of this standard and accepted by the department technical control manufacturer of structures The dry mixture and liquid glass are loaded into appropriate aerodynamic containers. Pentaphthalic enamel PF-115 in accordance with GOST or chemically resistant enamel XC-534 in accordance with TU can be applied to the dried coating as waterproofing or finishing, if provided for by the project. in two layers with a pneumatic paint sprayer at a compressed air pressure of up to 0.5 MPa (5).

4 Thickness of fire-retardant coating, mm Fire resistance limit of structures, h, not less than 5 1.0 1.5 2.0 3.0 When applying the coating on a construction site, the work is accepted by the customer organization and drawn up in a document free form. 3. Application of the coating composition It is allowed to apply the enamel with a roller in accordance with GOST in two layers. The maximum deviation of the thickness of the applied layer from the design one should not exceed 5%. The coating is accepted in batches. Up to 1000 protected surfaces are accepted per batch metal structures The application of the coating composition must be carried out at the manufacturer of metal structures or by a specialized organization directly at the construction site. The application and drying of enamel is carried out in accordance with the regulatory and technical documentation approved in the prescribed manner for these types of enamel. The coating should not have cracks, peeling, or swelling. Upon acceptance, a control check is carried out. appearance coating, its thickness, volumetric mass and compressive strength The composition is applied to steel structures primed with red lead according to GOST or GF type soils - according to TU or GOST in accordance with the requirements of SNiP for the design of protection of steel structures from corrosion Coating damaged during application transportation or during installation, must be restored in accordance with the requirements of this standard. The main physical and mechanical parameters of the coating must correspond to those given in the table. A control check of the appearance of the coating (clause 1.15) is carried out for each structure. The surface of the structure is moistened with liquid glass with a density = 1.2 ,

5 after which the composition (dry mixture and liquid glass) of the required thickness is applied by spraying at a time using an aerodynamic installation under the following operating modes: 4. Control methods Table If, when checking the appearance, it turns out that more than 10% of the structures do not meet the requirements of clause 1.5, then the batch is not subject to acceptance. compressed air pressure...0.3 MPa (3) 4.1. During operational control, the humidity of asbestos, the density of liquid glass, the fineness of grinding of the fire retardant, as well as application parameters (compressed air pressure, pressure of liquid glass at the outlet of the gun, the distance from the spray gun to the protected surface) are checked. Name of indicator Volumetric mass of the coating, no more than Norm 300 Compressive strength, MPa (), no less than 0.5 (5.0) 2.6. At least five structures from each batch must be checked for coating thickness. The measurement is carried out using a caliper in accordance with GOST. The arithmetic average of five measurements is taken as the result. pressure of liquid glass at the outlet 4.2. The moisture content of asbestos is determined according to GOST. Coated structures must be transported in accordance with the requirements of the SNiP chapter for the organization construction production The compressive strength and bulk density of the coating are determined according to GOST. To determine the compressive strength and bulk density of the coating, samples are taken from three designs of each batch. The result is taken as the arithmetic mean of three measurements. from a pistol...0.25 MPa (2.5) 4.3. The density of liquid glass is determined using a hydrometer according to GOST. Structures after coating must be stored in dry rooms. If the results are unsatisfactory according to one of the indicators specified in paragraphs. 1.4 and 1.6, the batch is not subject to acceptance. distance from the spray gun to 4.4. The fineness of fire retardant grinding is determined according to GOST

6 4.4. The fineness of fire retardant grinding is determined according to GOST

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GOST 23791-79

Group Zh15

STATE STANDARD OF THE USSR UNION

PHOSPHATE FIRE-RESISTANT COATING ON STEEL

Technical requirements

Phosphate fire protective steel coating. Technical requirements

Date of introduction 1980-01-01

By Decree of the USSR State Committee for Construction Affairs dated July 27, 1979 N 129, the implementation period was set from 01/01/1980.

This standard applies to phosphate fire retardant coatings on steel applied at a factory or construction site to steel structures to improve their fire resistance.

The standard establishes the basic requirements for the coating, components for its preparation and application technology.

1. COATING REQUIREMENTS

1.1. The coating should be used for fire protection of steel structures used indoors in a non-aggressive environment and a relative air humidity of no more than 75%.

1.2. The coating must be applied in one layer in accordance with the requirements given in the mandatory application. Finishing of the coating with paints and varnishes is allowed.

1.3. The fire resistance limits of steel structures depending on the thickness of the coating layer are given in Table 1.

Table 1


Thickness of fire retardant coating, mm	Fire resistance limit of structures, not less, h

1.4. The maximum deviation of the thickness of the applied layer from the design one should not exceed ±5%.

1.5. The coating should not have cracks, peeling, or swelling.

1.6. The main physical and mechanical characteristics of the coating must correspond to those given in Table 2.

table 2


The name of indicators
Volumetric mass of the coating, kg/m, no more
Compressive strength, kgf/cm, not less

1.7. Coated structures must be transported in accordance with the requirements of the SNiP chapter on the organization of construction production.

1.8. After coating, structures must be stored in dry rooms.

1.9. When transporting and storing structures at a relative air humidity of more than 75%, waterproofing should be applied to the surface of the coating (see clause 3.7 of the mandatory annex).

1.10. The coating consists of the following components: asbestos, liquid glass and nepheline fire retardant.

1.11. The consumption of components per 1 m of coating, taking into account 10% of production losses, is given in Table 3.

Table 3


Name of components	Consumption per 1 m, kg

Liquid glass with density = 1.2 g/cm
Nepheline flame retardant

1.12. The coating component is chrysotile asbestos III-V semi-rigid grades P-3-50, P-3-70, P-5-50 and P-5-65 according to GOST 12871-67 *.
________________
* In the territory Russian Federation the document is not valid. GOST R 52997-2008, GOST 25984.1-83 are in force; GOST 25984.3-83; GOST 25984.2-83; GOST 25984.5-83; GOST 25984.4-83; GOST 12871-93

The humidity of asbestos should not exceed 2%.

1.13. The coating component is potassium liquid glass with a module of 2.6-2.8 according to normative and technical documentation approved in the prescribed manner, or sodium liquid glass with a module of 2.6-2.8 in accordance with GOST 13078-67*.
________________
GOST 13078-81. - Database manufacturer's note.

1.14. The coating component is nepheline flame retardant in the form of a fine powder according to the regulatory and technical documentation approved in the prescribed manner. The residue on sieve No. 018 according to GOST 3584-73 * should be no more than 7%.
________________
* The document is not valid on the territory of the Russian Federation. GOST 6613-86 is valid

1.15. Coating components must be supplied in metal barrels, plastic or paper bags and stored in accordance with the requirements of regulatory and technical documentation approved in the prescribed manner

2. COATING QUALITY CONTROL

2.1. The finished coating must be checked for compliance with the requirements of this standard and those adopted by the technical control department of the structure manufacturer.

When applying coating on a construction site, acceptance of the work is carried out by the customer organization and is documented in a free-form act.

2.2. Coating acceptance is carried out in batches. Up to 1000 m of protected surface of metal structures is accepted as a batch.

2.3. Upon acceptance, a control check is made of the appearance of the coating, its thickness, bulk density and compressive strength.

2.4. A control check of the appearance of the coating (clause 1.5) is carried out for each structure.

2.5. If, when checking the appearance, it turns out that more than 10% of the structures do not meet the requirements of clause 1.5 of this standard, then the batch is not subject to acceptance.

2.6. At least five structures from each batch must be checked for coating thickness. The measurement is made using a caliper in accordance with GOST 166-73*. The result is taken as the arithmetic mean of five measurements.
________________
* The document is not valid on the territory of the Russian Federation. GOST 166-89 is in force. - Database manufacturer's note.

2.7. The compressive strength and bulk density of the coating are determined according to GOST 17177-71*. To determine the compressive strength and bulk density of the coating, samples are taken from three designs of each batch. The result is taken as the arithmetic mean of three measurements.
________________
* The document is not valid on the territory of the Russian Federation. GOST 17177-94 is valid, hereinafter in the text. - Database manufacturer's note.

2.8. If the results are unsatisfactory according to one of the indicators specified in clauses 1.4 and 1.6, the batch is not subject to acceptance.

APPENDIX (required). PREPARATION AND APPLICATION OF COATING COMPOSITION

APPLICATION
Mandatory

1. Materials

1.1. The materials used for coating must meet the requirements of paragraphs 1.12-1.14 of this standard.

2. Preparation of the coating composition

2.1. Preparation of dry mixture. Asbestos and nepheline fire retardant are weighed on weighing scales with an error of ±1% by weight and mixed in a continuous mixer.

Mixing time - at least 5 minutes.

2.2. Liquid glass is diluted with hot water at a temperature of no more than 80 ° C with constant stirring for at least 3 minutes to a density of = 1.2 g/cm.

It is allowed to dilute liquid glass with cold water at a temperature of 20±5 °C, provided that the mixing time is increased to 10 minutes. The diluted liquid glass is filtered through a sieve No. 05 according to GOST 3584-73.

2.3. The dry mixture and liquid glass are loaded into appropriate aerodynamic containers.

3. Application of the coating composition

3.1. The application of the coating composition must be carried out at the manufacturer of metal structures or by a specialized organization directly at the construction site.

3.2. The composition is applied to steel structures primed with red lead in accordance with GOST 8135-74 or with GF type primers - in accordance with GOST 4056-63 * or GOST 12707-77 in accordance with the requirements of SNiP for the design of protection of steel structures from corrosion.
________________
* The document is not valid on the territory of the Russian Federation. Replaced TU 6-10-1642-77, which is the author's development. For more information please follow the link. - Database manufacturer's note.

3.3. The surface of the structure is wetted with liquid glass with a density = 1.2 g/cm, after which the composition (dry mixture and liquid glass) of the required thickness is applied by spraying at a time using an aerodynamic installation under the following operating modes:


compressed air pressure
pressure of liquid glass at the outlet of the gun
distance from the spray gun to the protected surface when the composition jet is directed upwards	no more than 500 mm
distance from the spray gun to the protected surface when the composition jet is directed horizontally and downwards	no more than 700 mm

In hard-to-reach places, the specified distances can be reduced to 200 mm.

3.4. When applying a coating composition to structures, the requirements of SNiP for finishing coatings of building structures must also be observed; the finishing of the coating surface must be carried out in accordance with the design.

3.5. When applying the coating composition, the ambient temperature must be no lower than 5 ° C, air humidity no higher than 75%, in addition, in the conditions of the construction site, the structures must be protected from precipitation.

3.6. Drying of the coating must be carried out in natural conditions at an ambient temperature of not lower than 5 ° C and humidity not higher than 75% for at least 48 hours.

Drying at a temperature of 80-100 °C for at least 5 hours is allowed.

3.7. Pentaphthalic enamel PF-115 in accordance with GOST 6465-76 or chemically resistant enamel XC-534 in accordance with TU 6-10-801-76* can be applied to the dried coating as waterproofing or finishing, if provided for by the project. The enamel is applied in two layers using a pneumatic paint sprayer in accordance with GOST 7385-73 ** at a compressed air pressure of up to 5 5 kgf/cm.
________________
* Specifications mentioned here and further in the text are the author’s development. For more information please refer to the link;
** The document is not valid on the territory of the Russian Federation. Replaced TU 22-162-005-86, TU 22-5999-85, TU 22-6038-85 (IUS 2-84), which are the author’s development. For additional information, please follow the link, here and further in the text. - - Database manufacturer's note.

It is allowed to apply the enamel with a roller in accordance with GOST 10831-72* in two layers.
________________
* The document is not valid on the territory of the Russian Federation. GOST 10831-87 is in force. - Database manufacturer's note.

The application and drying of enamel is carried out in accordance with the regulatory and technical documentation, approved in accordance with the established procedure, for these types of enamel.

3.8. Coatings damaged during application, transportation or installation must be repaired in accordance with the requirements of this standard.

4. Control methods

4.1. During operational control, the humidity of asbestos, the density of liquid glass, the fineness of grinding of the fire retardant, as well as application parameters (compressed air pressure, pressure of liquid glass at the outlet of the gun, the distance from the spray gun to the protected surface) are checked.

4.2. The humidity of asbestos is determined according to GOST 17177-71.

4.3. The density of liquid glass is determined using a hydrometer according to GOST 1300-74 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 18481-81 is in force. - Database manufacturer's note.

4.4. The fineness of fire retardant grinding is determined according to GOST 310.2-76.

4.5. The pressure of compressed air and the pressure of liquid glass at the outlet of the gun are controlled using a pressure gauge in accordance with GOST 8625-77 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 2405-88 is in force. - Database manufacturer's note.

5. Safety precautions

5.1. The work site must be equipped with supply and exhaust ventilation.

5.2. Persons applying the coating must be provided with personal protective equipment: rubber gloves, respirators, safety glasses and tight overalls.

Electronic document text
prepared by Kodeks JSC and verified against:
official publication
Phosphate coatings for wood and steel
fire retardant. Technical requirements: Sat. GOST.
GOST 23790-79, GOST 23791-79. -
M.: Standards Publishing House, 1979

STATE STANDARD OF THE USSR UNION

COATING ON STEEL
PHOSPHATE FIRE RETARDANT

TECHNICAL REQUIREMENTS

GOST 23791-79

STATE COMMITTEE OF THE USSR
ON CONSTRUCTION AFFAIRS

Moscow

DEVELOPED by the USSR State Committee for Construction Affairs

PERFORMERS

V.A. Kopeikin,Dr. Tech. Sciences (topic leader); V.S. Sorin, Ph.D. tech. sciences; L. A. Lukatskaya, Ph.D. tech. sciences; L.A. Boykova; N.F. Vasilyeva, Ph.D. tech. sciences; I.R. Ladygina

INTRODUCED by the USSR State Committee for Construction Affairs

Member of the Board IN AND. Sychev

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated July 27, 1979 No. 129

STATE STANDARD OF THE USSR UNION

COATING ON STEEL
PHOSPHATE FIRE RETARDANT

Technicalrequirements

Phosphates fire protective still coating.
Technical requirements

GOST
23791-79

By Decree of the USSR State Committee for Construction Affairs dated July 27, 1979 No. 129, the introduction date was established

from 01.01. 1980

Failure to comply with the standard is punishable by law

This standard applies to phosphate fire retardant coatings on steel applied at a factory or construction site to steel structures to improve their fire resistance.

The standard establishes the basic requirements for the coating, components for its preparation and application technology.

1. COATING REQUIREMENTS

1.1. The coating should be used for fire protection of steel structures used indoors in a non-aggressive environment and a relative air humidity of no more than 75%.

1.2. The coating must be applied in one layer in accordance with the requirements given in the mandatory. Finishing of the coating with paints and varnishes is allowed.

1.3. The fire resistance limits of steel structures depending on the thickness of the coating layer are given in.

Thickness of fire retardant coating, mm

Fire resistance limit of structures, not less, h

Indicator name	Norm
Volumetric mass of the coating, kg/m 3, no more
Ultimate compressive strength, kgf/cm 2, not less

1.7. Coated structures must be transported in accordance with the requirements of the chapter on the organization of construction production.

1.8. After coating, structures must be stored in dry rooms.

1.9. When transporting and storing structures at a relative air humidity of more than 75%, waterproofing should be applied to the coating surface (see mandatory appendix).

1.10. The coating consists of the following components: asbestos, liquid glass and nepheline fire retardant.

1.11. The consumption of components per 1 m 3 of coating, taking into account 10% production losses, is given in.

Name of components	Consumption per 1 m 3, kg

Liquid glass with density = 1.2 g/cm 3
Nepheline flame retardant

UDC 614.841.332:620.197.6:006.354 Group Zh15

STATE STANDARD OF THE USSR UNION

Coating on steel

phosphate fire retardant

Technical requirements

Phosphate fire protective coating for

steel constructions. Technical requirements

Date of introduction

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated 01.01.01 No. 000

REISSUE. March 1985

This standard applies to phosphate fire retardant coatings on steel applied at a factory or construction site to steel structures to improve their fire resistance.

The standard establishes the basic requirements for the coating, components for its preparation and application technology.

1. COATING REQUIREMENTS

1.1. The coating should be used for fire protection of steel structures used indoors in a non-aggressive environment and a relative air humidity of no more than 75%.

1.2. The coating must be applied in one layer in accordance with the requirements given in the mandatory application. Finishing of the coating with paints and varnishes is allowed.

1.3. The fire resistance limits of steel structures depending on the thickness of the coating layer are given in Table. 1.

Table 1

Thickness of fire retardant coating, mm	Fire resistance limit of structures, h, not less

1.4. The maximum deviation of the thickness of the applied layer from the design one should not exceed 5%.

1.5. The coating should not have cracks, peeling, or swelling.

1.6. The main physical and mechanical characteristics of the coating must correspond to those given in table. 2.

table 2

1.7. Coated structures must be transported in accordance with the requirements of the SNiP chapter on the organization of construction production.

1.8. After coating, structures must be stored in dry rooms.

1.9. When transporting and storing structures at a relative air humidity of more than 75%, waterproofing should be applied to the coating surface (see clause 3.7 of the mandatory annex).

1.10. The coating consists of the following components: asbestos, liquid glass and nepheline fire retardant.

1.11. The consumption of components for 1 coating, taking into account 10% of production losses, is given in table. 3.

Table 3

1.12. The coating component is chrysotile asbestos III-V semi-rigid grades P-3-50, P-3-70, P-5-50 and P-5-65 according to GOST.

The humidity of asbestos should not exceed 2%.

2.1. The finished coating must be checked for compliance with the requirements of this standard and those adopted by the technical control department of the structure manufacturer.

When applying coating at a construction site, the work is accepted by the customer organization and formalized in a free-form document.

2.2. Coating acceptance is carried out in batches. Up to 1000 protected surfaces of metal structures are accepted per batch.

2.3. Upon acceptance, a control check is carried out on the appearance of the coating, its thickness, bulk density and compressive strength.

2.4. A control check of the appearance of the coating (clause 1.15) is carried out for each structure.

2.5. If, when checking the appearance, it turns out that more than 10% of the structures do not meet the requirements of clause 1.5, then the batch is not subject to acceptance.

2.6. At least five structures from each batch must be checked for coating thickness. The measurement is carried out using a caliper in accordance with GOST 166-73. The result is taken as the arithmetic mean of five measurements.

2.7. The compressive strength and bulk density of the coating are determined according to GOST. To determine the compressive strength and bulk density of the coating, samples are taken from three designs of each batch. The result is taken as the arithmetic mean of three measurements.

2.8. If the results are unsatisfactory according to one of the indicators specified in paragraphs. 1.4 and 1.6, the batch is not subject to acceptance.

APPLICATION

Mandatory

PREPARATION AND APPLICATION OF COATING COMPOSITION

1. Materials

1.1. Materials used for coating must meet the requirements of paragraphs. 1.12-1.14 of this standard.

2.1. Preparation of dry mixture

Asbestos and nepheline fire retardant are weighed on weighing scales with an error of 1% by weight and mixed in a continuous mixer.

Mixing time - at least 5 minutes.

2.2. Liquid glass is diluted with hot water at a temperature of no more than 80 ° C with constant stirring for at least 3 minutes to a density of = 1.2.

It is allowed to dilute liquid glass with cold water at a temperature of (205) °C, provided that the stirring time is increased to 10 minutes. The diluted liquid glass is filtered through sieve No. 05 according to GOST 3584-73.

2.3. The dry mixture and liquid glass are loaded into appropriate aerodynamic containers.

3.1. The application of the coating composition must be carried out at the manufacturer of metal structures or by a specialized organization directly at the construction site.

3.2. The composition is applied to steel structures primed with red lead according to GOST 8135-74 or GF type primers - according to TU or GOST in accordance with the requirements of SNiP for the design of protection of steel structures from corrosion.

3.3. The surface of the structure is moistened with liquid glass with a density = 1.2, after which the composition (dry mixture and liquid glass) of the required thickness is applied by spraying at a time using an aerodynamic installation under the following operating modes:

compressed air pressure......................0.3 MPa (3)

pressure of liquid glass at the outlet of the gun...............0.25 MPa (2.5)

distance from the spray gun to the protected surface when the jet of composition is directed upwards....................................no more than 500 mm

distance from the spray gun to the protected surface when directing the jet of composition in the horizontal direction and downwards.................................... ........no more than 700 mm

In hard-to-reach places, the specified distances can be reduced to 200 mm.

3.6. Drying of the coating should be carried out in natural conditions at an ambient temperature of not lower than 5 ° C and humidity not higher than 75% for at least 48 hours.

Drying at a temperature of 80-100 °C for at least 5 hours is allowed.

3.7. Pentaphthalic enamel PF-115 in accordance with GOST 6465-76 or chemically resistant enamel XC-534 in accordance with TU can be applied to the dried coating as waterproofing or finishing, if provided for by the project. The enamel is applied in two layers using a pneumatic paint sprayer at a compressed air pressure of up to 0.5 MPa (5).

It is allowed to apply the enamel with a roller according to GOST in two layers.

The application and drying of enamel is carried out in accordance with the regulatory and technical documentation approved in accordance with the established procedure for these types of enamel.

3.8. Coatings damaged during application, transportation or installation must be repaired in accordance with the requirements of this standard.

4. Control methods

4.2. The humidity of asbestos is determined according to GOST 17177.4-81.

4.3. The density of liquid glass is determined using a hydrometer according to GOST.

4.4. The fineness of fire retardant grinding is determined according to GOST 310.2-76.

4.5. The pressure of compressed air and the pressure of liquid glass at the outlet of the gun is controlled using a pressure gauge in accordance with GOST 8625-77.

5. Safety precautions

5.1. The work site must be equipped with supply and exhaust ventilation.

5.2. Persons applying the coating must be provided with personal protective equipment: rubber gloves, respirators, safety glasses and tight overalls.

1. COATING REQUIREMENTS

2. COATING QUALITY CONTROL

APPENDIX (required). PREPARATION AND APPLICATION OF COATING COMPOSITION

1. Materials

2. Preparation of the coating composition

3. Application of the coating composition

4. Control methods

5. Safety precautions

GOST 23791-79

UDC 614.841.332:620.197.6:006.354

Group Zh15

STATE STANDARD OF THE USSR

Fire retardant phosphate coating on steel.

Technical requirements

Phosphate fire protective coating for

steel constructions. Technical requirements

Date of introduction 1980-01-01

APPROVED AND PUT INTO EFFECT Resolution of the USSR State Committee for Construction Affairs dated July 27, 1979 No. 129

REISSUE. March 1985

This standard applies to phosphate fire retardant coatings on steel applied at a factory or construction site to steel structures to improve their fire resistance.

The standard establishes the basic requirements for the coating, components for its preparation and application technology.

1. COATING REQUIREMENTS

1.1. The coating should be used for fire protection of steel structures used indoors in a non-aggressive environment and a relative air humidity of no more than 75%.

1.2. The coating must be applied in one layer in accordance with the requirements given in the mandatory application. Finishing of the coating with paints and varnishes is allowed.

1.3. The fire resistance limits of steel structures depending on the thickness of the coating layer are given in Table. 1.

Table 1

1.4. The maximum deviation of the thickness of the applied layer from the design one should not exceed ±5%.

1.5. The coating should not have cracks, peeling, or swelling.

1.6. The main physical and mechanical characteristics of the coating must correspond to those given in table. 2.

table 2

1.7. Coated structures must be transported in accordance with the requirements of the SNiP chapter on the organization of construction production.

1.8. After coating, structures must be stored in dry rooms.

1.9. When transporting and storing structures at a relative air humidity of more than 75%, waterproofing should be applied to the coating surface (see clause 3.7 of the mandatory annex).

1.10. The coating consists of the following components: asbestos, liquid glass and nepheline fire retardant.

1.11. The consumption of components per 1 m 3 of coating, taking into account 10% of production losses, is given in table. 3.

Table 3

1.12. The coating component is chrysotile asbestos III-V semi-rigid grades P-3-50, P-3-70, P-5-50 and P-5-65 according to GOST 12871-83.

The humidity of asbestos should not exceed 2%.

1.14. The coating component is nepheline flame retardant in the form of a fine powder according to regulatory and technical documentation approved in the prescribed manner. The residue on sieve No. 018 according to GOST 3584-73 should be no more than 7%.

2. COATING QUALITY CONTROL

2.1. The finished coating must be checked for compliance with the requirements of this standard and those adopted by the technical control department of the structure manufacturer.

When applying coating at a construction site, the work is accepted by the customer organization and formalized in a free-form document.

2.2. Coating acceptance is carried out in batches. Up to 1000 m2 of protected surface of metal structures is accepted as a batch.

2.3. Upon acceptance, a control check is carried out on the appearance of the coating, its thickness, bulk density and compressive strength.

2.4. A control check of the appearance of the coating (clause 1.15) is carried out for each structure.

2.5. If, when checking the appearance, it turns out that more than 10% of the structures do not meet the requirements of clause 1.5, then the batch is not subject to acceptance.

2.7. The compressive strength and bulk density of the coating are determined according to GOST 17177-71. To determine the compressive strength and bulk density of the coating, samples are taken from three designs of each batch. The result is taken as the arithmetic mean of three measurements.

2.8. If the results are unsatisfactory according to one of the indicators specified in paragraphs. 1.4 and 1.6, the batch is not subject to acceptance.

APPENDIX (Required)

PREPARATION AND APPLICATION OF COATING COMPOSITION

1. Materials

1.1. Materials used for coating must meet the requirements of paragraphs. 1.12-1.14 of this standard.

2.1. Preparation of dry mixture

Asbestos and nepheline fire retardant are weighed on weighing scales with an error of ±1% by weight and mixed in a continuous mixer.

Mixing time - at least 5 minutes.

2.2. Liquid glass is diluted with hot water at a temperature of no more than 80 ° C with constant stirring for at least 3 minutes to a density ρ = 1.2 g/cm 3 .

It is allowed to dilute liquid glass with cold water at a temperature of (20±5) °C, provided that the mixing time is increased to 10 minutes. The diluted liquid glass is filtered through sieve No. 05 according to GOST 3584-73.

2.3. The dry mixture and liquid glass are loaded into appropriate aerodynamic containers.

3. Application of the coating composition

3.1. The application of the coating composition must be carried out at the manufacturer of metal structures or by a specialized organization directly at the construction site.

3.2. The composition is applied to steel structures primed with red lead in accordance with GOST 8135-74 or with GF type primers - in accordance with TU 610-1642-77 or GOST 12707-77 in accordance with the requirements of SNiP for the design of protection of steel structures from corrosion.

3.3. The surface of the structure is moistened with liquid glass with a density ρ = 1.2 kgf/cm 3, after which the composition (dry mixture and liquid glass) of the required thickness is applied by spraying at a time using an aerodynamic installation under the following operating modes:

· compressed air pressure......................0.3 MPa (3 kgf/cm 3)

·pressure of liquid glass at the outlet of the gun...............0.25 MPa (2.5 kgf/cm 3)

·distance from the spray gun to the protected surface when the jet of composition is directed upwards....................................no more than 500 mm

·distance from the spray gun to the protected surface when the composition jet is directed horizontally and downwards................................ .........no more than 700 mm

In hard-to-reach places, the specified distances can be reduced to 200 mm.

3.4. When applying the coating composition to structures, the requirements of SNiP for finishing coatings of building structures must also be observed; the finishing of the coating surface must be carried out in accordance with the design.

3.6. Drying of the coating should be carried out in natural conditions at an ambient temperature of not lower than 5 ° C and humidity not higher than 75% for at least 48 hours.

Drying at a temperature of 80-100 °C for at least 5 hours is allowed.

3.7. Pentaphthalic enamel PF-115 in accordance with GOST 6465-76 or chemically resistant enamel XC-534 in accordance with TU 6-10-801-76 can be applied to the dried coating as waterproofing or finishing, if provided for by the project. The enamel is applied in two layers using a pneumatic paint sprayer at a compressed air pressure of up to 0.5 MPa (5 kgf/cm3).

It is allowed to apply the enamel with a roller in accordance with GOST 10831-80 in two layers.

The application and drying of enamel is carried out in accordance with the regulatory and technical documentation approved in accordance with the established procedure for these types of enamel.

3.8. Coatings damaged during application, transportation or installation must be repaired in accordance with the requirements of this standard.

4. Control methods

4.2. The humidity of asbestos is determined according to GOST 17177.4-81.

4.3. The density of liquid glass is determined using a hydrometer according to GOST 18481-81.

4.4. The fineness of fire retardant grinding is determined according to GOST 310.2-76.

4.5. The pressure of compressed air and the pressure of liquid glass at the outlet of the gun is controlled using a pressure gauge in accordance with GOST 8625-77.

5. Safety precautions

5.1. The work site must be equipped with supply and exhaust ventilation.

5.2. Persons applying the coating must be provided with personal protective equipment: rubber gloves, respirators, safety glasses and tight overalls.

1. COATING REQUIREMENTS

2. COATING QUALITY CONTROL

APPENDIX (required). PREPARATION AND APPLICATION OF COATING COMPOSITION

1. Materials

2. Preparation of the coating composition

3. Application of the coating composition

4. Control methods

5. Safety precautions

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