GOST coating on steel phosphate fire retardant. technical requirements

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GOST 23791-79

Group G15

STATE STANDARD OF THE UNION OF THE SSR

COATING ON STEEL PHOSPHATE FIRE PROTECTIVE

Technical requirements

Phosphate fire protective steel coating. technical requirements

Introduction date 1980-01-01

Decree State Committee USSR on construction matters dated July 27, 1979 N 129, the deadline for introduction is set from 01/01/1980.

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

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

1. COATING REQUIREMENTS

1.1. Coating should be used for fire protection steel structures operated indoors with a non-aggressive environment and a relative humidity of not more than 75%.

1.2. The coating must be applied in one coat in accordance with the requirements given in the mandatory annex. Coating finish allowed paintwork materials.

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

Table 1


Fire retardant coating thickness, mm	Fire resistance limit of structures, not less than, h

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

1.5. The coating should not have cracks, delaminations, blisters.

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

table 2


The name of indicators
Volume weight of coating, kg/m, no more
Compressive strength, kgf/cm, not less than

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

1.8. Structures after coating should be stored in dry rooms.

1.9. During transportation and storage of structures with 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 appendix).

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

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

Humidity of asbestos should not exceed 2%.

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

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

1.15. Coating components must be supplied in metal drums, polyethylene 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 accepted by the technical control department of the manufacturer of structures.

When coating is applied at a construction site, the acceptance of work is carried out by the customer organization and is drawn up by an act of any form.

2.2. The acceptance of the coating is carried out in batches. Up to 1000 m of protected surface is accepted per batch metal structures.

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

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

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 lot is not subject to acceptance.

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

2.7. The compressive strength and bulk density of the coating is 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 applies, hereinafter in the text. - Database manufacturer's note.

2.8. In case of unsatisfactory results for one of the indicators specified in clauses 1.4 and 1.6, the batch is not subject to acceptance.

APPENDIX (mandatory). COATING PREPARATION AND APPLICATION

APPENDIX
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. Dry mix preparation. Asbestos and nepheline flame retardant are weighed on weight batchers with an error of ± 1% by weight and mixed in a mixer continuous action.

Mixing time - not less than 5 minutes.

2.2. Liquid glass is diluted hot water temperature not more than 80 °C with constant stirring for at least 3 minutes until density = 1.2 g/cm.

It is allowed to dilute liquid glass cold water temperature 20 ± 5 °C, provided that the mixing time is increased to 10 minutes. Diluted liquid glass is filtered through a N 05 sieve according to GOST 3584-73.

2.3. Dry mixture and liquid glass are loaded into the appropriate containers of aerodynamic action.

3. Application of the coating composition

3.1. The application of the coating composition should be carried out at the manufacturer of metal structures or 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 primers of the GF type - 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 against corrosion.
________________
* The document is not valid on the territory of the Russian Federation. Replaced by TU 6-10-1642-77, which is the author's development. See the link for more information. - Database manufacturer's note.

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


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

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

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

3.5. When applying the coating composition, the ambient air temperature should not be lower than 5 °C, the air humidity should not be higher than 75%, in addition, in the conditions of the construction site, the structures must be protected from atmospheric precipitation.

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

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

The application and drying of enamel is carried out in accordance with the normative and technical documentation approved in the prescribed manner for these types of enamel.

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

4. Control methods

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

4.2. 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 valid. - Database manufacturer's note.

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

4.5. Compressed air pressure and liquid glass pressure 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 valid. - Database manufacturer's note.

5. Safety

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

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

Electronic text of the document
prepared by CJSC "Kodeks" and checked against:
official publication
Phosphate coatings on wood and steel
fire retardant. Technical requirements: Sat. GOSTs.
GOST 23790-79, GOST 23791-79. -
M.: Publishing house of standards, 1979

STATE STANDARD OF THE UNION OF THE SSR

COATING ON STEEL
PHOSPHATE FIRE PROTECTIVE

TECHNICAL REQUIREMENTS

GOST 23791-79

USSR STATE COMMITTEE
CONSTRUCTION

Moscow

DEVELOPED by the USSR State Committee for Construction

PERFORMERS

V.A. Kopeikin,Dr. tech. sciences (topic leader); V.S. Sorin, cand. tech. sciences; L. A. Lukatskaya, cand. tech. sciences; L.A. Boikov; N.F. Vasilyeva, cand. tech. sciences; I.R. Ladygin

INTRODUCED by the USSR State Committee for Construction

Member of the Board IN AND. Sychev

APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Construction of July 27, 1979 No. 129

STATE STANDARD OF THE UNION OF THE SSR

COATING ON STEEL
PHOSPHATE FIRE PROTECTIVE

Technicalrequirements

Phosphates fire protective still coating.
technical requirements

GOST
23791-79

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

from 01.01. 1980

Non-compliance with the standard is punishable by law

This standard applies to a phosphate fire retardant coating on steel applied in 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 operated indoors with a non-aggressive environment and a relative air humidity of not more than 75%.

1.2. The coating must be applied in one coat in accordance with the requirements given in the mandatory. Finishing of a covering by 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.

Fire retardant coating thickness, mm

Fire resistance limit of structures, not less than, h

Name of indicator	Norm
Volume weight of coating, kg/m 3 , no more
Compressive strength, kgf/cm 2 , not less than

1.7. Coated structures must be transported in accordance with the requirements of the building management chapter.

1.8. Structures after coating should be stored in dry rooms.

1.9. During transportation and storage of structures with relative air humidity of more than 75%, waterproofing should be applied to the surface of the coating (see the mandatory appendix).

1.10. The coating consists of the following components: asbestos, liquid glass and nepheline flame 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 1m 3, kg

Liquid glass with a density \u003d 1.2 g / cm 3
Nepheline fire retardant

GOST 23791-79

UDC 614.841.332:620.197.6:006.354 Group Zh15

STATE STANDARD OF THE UNION OF THE SSR

Coating on steel

phosphate flame retardant

Technical requirements

Phosphate fire protective coating for

steel constructions. technical requirements

Introduction date 1980-01-01

APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Construction of July 27, 1979 No. 129

REPUBLICATION. March 1985

This standard applies to a phosphate fire retardant coating on steel applied in 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 operated indoors with a non-aggressive environment and a relative air humidity of not more than 75%.

1.2. The coating must be applied in one coat in accordance with the requirements given in the mandatory annex. Finishing of a covering by 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. one.

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, delaminations, blisters.

1.6. The main physical and mechanical characteristics of the coating should 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. Structures after coating should be stored in dry rooms.

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

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

Table 3

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

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 the 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 13078-81.

1.14. The coating component is a 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 the sieve No. 018 according to GOST 3584-73 should be no more than 7%.

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

When coating is applied at the construction site, the work is accepted by the customer organization and formalized by an act of any form.

2.2. The acceptance of the coating 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 made 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 design.

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 lot is not subject to acceptance.

2.6. At least five structures from each batch must be checked for the thickness of the coating. 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 is 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. In case of unsatisfactory results in one of the indicators specified in paragraphs. 1.4 and 1.6, the lot is not subject to acceptance.

APPENDIX

Mandatory

COATING PREPARATION AND APPLICATION

1. Materials

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

2.1. Dry mix preparation

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

Mixing time - not less than 5 minutes.

2.2. Liquid glass is diluted with hot water at a temperature of not 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 mixing time is increased to 10 minutes. 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 the appropriate containers of aerodynamic action.

3.1. The application of the coating composition should be carried out at the manufacturer of metal structures or 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 primers of the GF type - 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 against corrosion.

3.3. The surface of the structure is wetted 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 with an aerodynamic action 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 the composition is directed upwards .................................................................................. no more than 500 mm

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

In hard-to-reach places, the indicated 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 should also be observed, the surface finish of the coating should be carried out in accordance with the project.

3.5. When applying the coating composition, the ambient air temperature must not be lower than 5 ° C, the air humidity must not be higher than 75%, in addition, in the conditions of the construction site, the structures must be protected from atmospheric precipitation.

3.6. Drying of the coating should be carried out in natural conditions at an ambient temperature not lower than 5 ° C and a 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.

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

The application and drying of the enamel is carried out in accordance with the normative and technical documentation approved in the prescribed manner for these types of enamel.

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

4. Control methods

4.1. During step-by-step control, asbestos moisture content, liquid glass density, flame retardant grinding fineness, as well as application parameters (compressed air pressure, liquid glass pressure at the gun outlet, distance from the spray gun to the protected surface) are checked.

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 grinding flame retardant 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 according to GOST 8625-77.

5. Safety

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, goggles and tight overalls.

1. COATING REQUIREMENTS

2. COATING QUALITY CONTROL

APPENDIX (mandatory). COATING PREPARATION AND APPLICATION

1. Materials

2. Preparation of the coating composition

3. Application of the coating composition

4. Control methods

5. Safety

Size: px

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transcript

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. During transportation and storage of structures with 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 appendix). APPENDIX of the protected surface in the direction 4.5. Compressed air pressure and liquid glass pressure at the outlet of the gun are controlled using a pressure gauge in accordance with GOST Date of introduction The coating consists of the following components: asbestos, liquid glass and nepheline flame retardant. jet of the composition up ... no more than 500 mm 5. Safety measures Adopting authority: Gosstroy of the USSR 1.11. The consumption of components per 1 is given in Table. 3. coatings subject to 10% production loss distance from the spray gun to 5.1. The work site must be equipped with supply and exhaust ventilation. APPROVED AND PUT INTO EFFECT by the Decree of the State Committee of the USSR for Construction of July 27, 1979 129 Table 3 1. Materials of the surface to be protected in direction 5.2. Persons applying the coating must be provided with personal protective equipment: rubber gloves, respirators, goggles and tight overalls.

2 REVISION. March 1985 Component name Asbestos Liquid glass with a density of 1.2 Nepheline fire retardant Consumption, kg 1.1. The materials used for coating must meet the requirements of paragraphs of this standard. composition jets in the horizontal direction This standard applies to a phosphate fire-retardant coating on steel, applied at a factory or construction site to steel structures to increase their fire resistance 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. Asbestos humidity should not exceed 2% Preparation of dry mix In hard-to-reach places, the indicated distances can be reduced to 200 mm. 1. REQUIREMENTS FOR THE COATING Coating component - potassium liquid glass with a module of 2.6-2.8 according to the normative and technical documentation approved in the established manner, or sodium liquid glass with a module of 2.6-2.8 in accordance with GOST Asbestos and nepheline fire retardant are weighed on weight batchers with an error of 1% by weight and mixed in a continuous mixer When applying the coating composition to structures, the requirements of SNiP for finishing coatings of building structures should also be observed, the surface finish of the coating should be carried out in accordance with the project The coating should be used for fire protection of steel structures operated inside rooms with a non-aggressive environment and relative humidity of no more than 75%.

3 1.14. The coating component is a nepheline flame retardant in the form of a fine powder according to the regulatory and technical documentation approved in the prescribed manner. The rest on the 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 should not be lower than 5, the air humidity should not be higher than 75%, in addition, under 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. It is allowed to finish the coating with paints and varnishes. Coating components must be supplied in metal drums, polyethylene or paper bags and stored in accordance with the requirements of normative and technical documentation approved in the prescribed manner. 2.2. Liquid glass is diluted with hot water at a temperature of not more than 80 with constant stirring for at least 3 minutes to a density of =1. Depending on the thickness of the coating layer are given in Table COATING QUALITY CONTROL It is allowed to dilute liquid glass with cold water at a temperature of (20 5) provided that the mixing time is increased to 10 minutes. Diluted liquid glass is filtered through a 05 sieve according to GOST Drying is allowed at a temperature of at least 5 hours. dried coating as a waterproofing or finishing, if it is provided for by the project, pentaphthalic enamel PF-115 according to GOST or chemically resistant enamel XC-534 according to TU can be applied. The enamel is applied in two layers with a pneumatic paint sprayer at a compressed air pressure of up to 0.5 MPa (5 ).

4 Thickness of fire protection coating, mm Fire resistance limit of structures, h, min. 3. Application of the coating composition It is allowed to apply enamel with a roller in accordance with GOST in two layers. The maximum deviation of the thickness of the applied layer from the design should not exceed 5%. The acceptance of the coating is carried out in batches. Up to 1000 protected surfaces of metal structures are accepted per batch. The application of the coating composition should be carried out at the manufacturer of metal structures or a specialized organization directly at the construction site. The application and drying of the 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, swelling Upon acceptance, a control check is made on the appearance of the coating, its thickness, bulk density and compressive strength The composition is applied to steel structures primed with minium iron in accordance with GOST or primers of the GF type - in accordance with TU or GOST in accordance with the requirements of SNiP for the design of protection of steel structures against 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 characteristics of the coating must correspond to those given in 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 of = 1.2,

5 after that, the composition (dry mixture and liquid glass) of the required thickness is applied by spraying at a time with an aerodynamic action installation under the following operating modes: 4. Control methods the party is not eligible for acceptance. compressed air pressure...0.3 MPa (3) 4.1. During step-by-step control, the moisture content of asbestos, the density of liquid glass, the fineness of grinding of the fire retardant, as well as the application parameters (compressed air pressure, liquid glass pressure at the outlet of the gun, the distance from the spray gun to the protected surface) are checked. Index name Coating bulk density, not more than Norm 300 Compressive strength, MPa (), not less than 0.5 (5.0) 2.6. At least five structures from each batch should be checked for the thickness of the coating. The measurement is carried out using a caliper in accordance with GOST. The result is taken as the arithmetic mean of five measurements. liquid glass pressure 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 head of SNiP on the organization of 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 structures 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 should be stored in dry rooms. If the results are unsatisfactory for one of the indicators specified in paragraphs. 1.4 and 1.6, the lot is not subject to acceptance. spray gun distance up to 4.4. The fineness of the flame retardant grinding is determined according to GOST

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

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GOST 23791-79

UDC 614.841.332:620.197.6:006.354

Group G15

STATE STANDARDSOYUZ SSR

Fire retardant phosphate coating on steel.

Technical requirements

Phosphate fire protective coating for

steel constructions. technical requirements

Introduction date 1980-01-01

APPROVED AND INTRODUCED Decree of the USSR State Committee for Construction of July 27, 1979 No. 129

REPUBLICATION. March 1985

This standard applies to a phosphate fire retardant coating on steel applied in 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 operated indoors with a non-aggressive environment and a relative air humidity of not more than 75%.

1.2. The coating must be applied in one coat in accordance with the requirements given in the mandatory annex. Finishing of a covering by 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. one.

Table 1

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

1.5. The coating should not have cracks, delaminations, blisters.

1.6. The main physical and mechanical characteristics of the coating should 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. Structures after coating should be stored in dry rooms.

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

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

Table 3

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

Humidity of asbestos should not exceed 2%.

1.14. The coating component is a 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 the 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 accepted by the technical control department of the manufacturer of structures.

When coating is applied at the construction site, the work is accepted by the customer organization and formalized by an act of any form.

2.2. The acceptance of the coating is carried out in batches. Up to 1000 m 2 of the protected surface of metal structures is accepted per batch.

2.3. Upon acceptance, a control check is made 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 design.

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 lot is not subject to acceptance.

2.8. In case of unsatisfactory results in one of the indicators specified in paragraphs. 1.4 and 1.6, the lot is not subject to acceptance.

APPENDIX (Required)

COATING PREPARATION AND APPLICATION

1. Materials

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

2.1. Dry mix preparation

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

Mixing time - not less than 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 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. 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 the appropriate aerodynamic containers.

3. Application of the coating composition

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

3.3. The surface of the structure is wetted with liquid glass with a density of 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 with an aerodynamic action installation under the following operating modes:

Compressed air pressure ............................... 0.3 MPa (3 kgf / cm 3)

liquid glass pressure 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 the composition is directed upwards .................................................................. no more than 500 mm

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

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

3.5. When applying the coating composition, the ambient air temperature must not be lower than 5 °C, the humidity of the air must not be higher than 75%, in addition, in the conditions of the construction site, the structures must be protected from atmospheric precipitation.

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

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

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

The application and drying of the enamel is carried out in accordance with the normative and technical documentation approved in the prescribed manner for these types of enamel.

3.8. Coatings damaged during application, transport or installation shall 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 grinding flame retardant 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 according to GOST 8625-77.

5. Safety

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, goggles and tight overalls.

1. COATING REQUIREMENTS

2. COATING QUALITY CONTROL

APPENDIX (mandatory). COATING PREPARATION AND APPLICATION

1. Materials

2. Preparation of the coating composition

3. Application of the coating composition

4. Control methods

5. Safety