The interaction of compressed oxygen gas with organic substances (fats, lubricants) leads to their spontaneous ignition and explosion. Therefore, it is so important when working with the appropriate equipment to exclude such contact for all devices. One of the mandatory measures in this case is degreasing the oxygen pressure gauges that perform the control and measuring function. It is carried out after each state verification of the device.

How to determine the presence of organic oils inside the pressure gauge? To do this, you need to inject hot water into the inlet of the fitting using a syringe. After vigorous shaking, pour it into a test tube with ordinary clean water or onto a white paper sheet. The presence of oil will be indicated by a rainbow film on the surface of the liquid or greasy spots on the paper.

Solvent degreasing

If there is an oil fraction inside the device, it is necessary to thoroughly degrease the pressure gauge. To do this, chlorine-containing solvents (trichlorethylene, perchlorethylene, freon 113) are injected into the cavity of its tubular spring, which must remain inside the measuring device for at least 20 minutes. After exposure, they are removed by vacuuming or by freely draining into a prepared vessel.

The quality of degreasing with a solvent is controlled by checking its last portion. The waste liquid is poured onto an absorbent paper napkin and the presence of oil inclusions is determined by fluorescence of its surface in ultraviolet light. Compared to water wetting, they have a different luminescence intensity.

Degreasing the pressure gauge with chlorine-containing solvents ensures no more than 20 mg/sq.m. residual content of fatty contaminants.

As for checking the oil content on the outer surface of the pressure gauge, it is performed in two ways: ultraviolet illuminators and a special thin glass fiber cloth.

In the latter case, the presence of fatty contaminants is checked using a luminescent device or the so-called quantitative method. In this case, the used napkin is washed in 100 cm 3 of solvent. After which 10 cm 3 of this solution is poured into the cuvette of a luminescent device, where the oil content is determined.

Control over the degreasing of oxygen pressure gauges is based on measurements of the concentration of fatty contaminants in the waste solvent. The obtained figures should not exceed standard values, depending on the pressure of the measured oxygen-containing environment.

No.________ "__"______ 20__

Representative of the developer or customer_____________________________________________

(job title,

Representative of the person carrying out the construction, __________________________

(job title,

__________________________________________________________________________

surname, initials, details of the document on representation)

Representative of the person carrying out the construction on construction control issues_________________________________________________________________

(job title,

__________________________________________________________________________

surname, initials, details of the document on representation)

Representative of the person carrying out construction, performing technical supervision of installation work, (chief engineer)_____________________________

__________________________________________________________________________

Representative of the person preparing the project documentation______

__________________________________________________________________________

(position, surname, initials

__________________________________________________________________________

details of the document on representation)

Representative of the person carrying out the construction who carried out the work on degreasing the equipment, _______________________________________________

(position, surname, initials,

__________________________________________________________________________

details of the document on representation)

as well as other representatives of persons involved in defatting,_________________

__________________________________________________________________________

(position, surname, initials,

__________________________________________________________________________

details of the document on representation)

carried out process control and review of the results of degreasing of equipment, fittings, pipelines, assembly units and parts (hereinafter referred to as the product), presented ___________________________________________

(name of the person, actually

__________________________________________________________________________

presenting the product for degreasing)

and have drawn up this act as follows:

1. The product has been degreased:

a) technological equipment (apparatus, container, etc.)

b) fittings of the same type

c) pipeline, pipeline network

d) assembly unit, part

2. Accompanying documents presented________________________________________________

__________________________________________________________________________

__________________________________________________________________________

as well as design documentation for non-standard equipment________________

__________________________________________________________________________

(number, other details of the drawing, name of the design

__________________________________________________________________________

documentation, information about persons carrying out

__________________________________________________________________________

preparation of the design documentation section)

3. Documents are presented confirming the product’s compliance with the requirements for it, including:

a) for compliance with the requirements of technical documentation of manufacturers and design documentation of developers, technical regulations (norms and rules), other regulatory legal acts______________________________

(Name

__________________________________________________________________________

document of compliance, date, number, other details)

b) results of examinations, surveys, laboratory and other tests and work performed under construction control

__________________________________________________________________________

(name of document, date, number, other details)

4. The necessary tests and testing have been carried out___________________________

__________________________________________________________________________

(name of document, date, number, other details)

5. Documents confirming the quality of degreasing of the product from the manufacturer have been presented, _______________________________________________________________

__________________________________________________________________________

(name of document, date, number, other details)

6. Product manufactured (delivered)__________________________________________

(name of manufacturer (supplier, intermediary),

__________________________________________________________________________

name, number and date of issue of the state registration certificate, OGRN, TIN,

__________________________________________________________________________

postal details, telephone, fax - for legal entities;

__________________________________________________________________________

last name, first name, patronymic, passport details,

__________________________________________________________________________

place of residence, telephone, fax - for individuals)

7. Characteristics of the product subjected to degreasing of internal surfaces,_______________________________________________________________

(purpose of the product, technological

__________________________________________________________________________

the environment in the product, its condition and characteristics,

__________________________________________________________________________

requirements for cleanliness of internal surfaces)

8. A work permit has been presented to perform the work.

__________________________________________________________________________

(name of document, date, number, other details)

The standard applies to cryogenic, cryogenic-vacuum equipment operating with oxygen, including medical oxygen, nitrogen and other air separation products, and establishes general technological requirements for methods for removing fatty contaminants from the surface of products (degreasing). The standard does not establish requirements for the processes of depreservation of products.

By Amendment No. 2, changes have been made to this OST

Industry standard

OST26-04-312-83

Methods for degreasing equipment. General requirements for technological processes

(put into effect by letter of the Technical Department of the Ministry of Chemical Engineering dated November 29, 1983 N11-10-4/1685)

Instead of OST26-04-312-71

This standard applies to cryogenic, cryogenic-vacuum equipment and equipment working with oxygen, including medical, nitrogen and other air separation products, and establishes general technological requirements for methods for removing fatty contaminants from the surface of products (degreasing).

The standard does not establish requirements for the processes of depreservation of products.

Explanations of terms used in this standard are given in the reference.

1.6. Compliance of the content of fatty contaminants with established standards is confirmed by a mark in the control route map, in the technological data sheet of the product or in other technical documentation. Based on these documents, marks are entered into the product passport, for example: “The content of fatty contaminants does not exceed the standards established by GOST 12.2.052” or “degreased”.

1.7. The preparation and implementation of all degreasing work must be supervised by a responsible person appointed in writing by the administration, who must be fully responsible for compliance with degreasing technology, timely technical control and the safety of work.

2. Technical requirements

2.1. Material requirements

2.1.1. Solvents or aqueous cleaning solutions should be used to degrease equipment. The need to use solvents or aqueous cleaning solutions must be indicated in the technological documentation.

2.2. Solvents

The used solvents of groups 1 and 2, used at a temperature of 10-20 ° C, depending on the detergent and physicochemical properties, are given in table. 1.

Amendment No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, amended subclause 2.2.2 of this OST, coming into force on July 1, 1987.

2.2.2. When degreasing materials other than those indicated in the table. 1, tests should be carried out for corrosion compatibility with solvents and residual content of fatty contaminants.

Scope of solvents

2.2.3. The quality of the solvent must fully meet the requirements of regulatory and technical documents for the solvent and is confirmed by the manufacturer’s passport certificate.

Solvents supplied for degreasing must be checked before use according to the indicators specified in the mandatory.

2.2.4. Degreasing with a solvent is carried out 1-2 times depending on the shape of the parts and the required quality of degreasing. When carrying out double degreasing, the residual content of fatty contaminants can be taken equal to the upper limit given in table. 1, without control.

Permissible content of fatty contaminants

Compositions of aqueous cleaning solutions and degreasing regimes

______________________________

*One of the following substances is used:

Surfactant Neonol AF9.6. TU 38.50724 (20 g/l) or Neonol AF9.12 TU 38.10362 (5 g/l), syntanol DS-10 according to TU 6-14-577 - 5 g/dm 3 ; nonionic drug syntamid 5 according to TU 6-02-640 - 5 g/dm 3 .

**When using solutions with household detergents, it is mandatory to inspect fat-free products after washing and drying. If dry residues of cleaning solutions are found, they must be removed.

2.3.3. The components of aqueous cleaning solutions must comply with the requirements of the regulatory and technical documents specified in.

2.3.4. To prepare aqueous cleaning solutions, drinking water is used in accordance with GOST 2874. The use of water from the recycling water supply system is not permitted.

2.3.5. When degreasing products made from materials other than those specified in , they should be tested for corrosion compatibility with aqueous cleaning solutions and for the achieved purity of degreasing.

2.3.6. To wash products made of ferrous metals, after degreasing with aqueous cleaning solutions, it is recommended to use water with additives of a corrosion inhibitor - technical sodium nitrite according to GOST 19906 in an amount of 2 g/dm 3 of water.

3.3. When carrying out degreasing of cryogenic vessels, if the presence of a person in them is required, the requirements of the “Temporary Standard Instructions for Organizing the Safe Conduct of Gas Hazardous Work at Enterprises of the Ministry of Chemical Industry of the USSR”, approved by the State Technical Inspectorate of the USSR and the MHPSSSR, must be observed. Before carrying out degreasing work on cryogenic vessels that have been in use, they must be heated to temperatures in the range of 12-30°C and ventilated. Work should be carried out only when the oxygen content in the air inside the vessels ranges from 19 to 23%.

In the organization carrying out degreasing, instructions for carrying out this work must be approved in accordance with the established procedure.

3.4. Degreasing of individual parts by immersing them in baths with solvents should be carried out in devices with a closed or semi-closed degreasing cycle, equipped with local ventilation and excluding the entry of solvent vapors into the air of production premises. In this case, it is necessary to create continuity in the process of degreasing, drying and unloading parts. Solvent from equipment and baths must be drained into closed containers through pipelines.

3.5. When degreasing equipment with solvents of group 1 (see), it is necessary to ensure the tightness of the equipment in which degreasing is carried out.

3.6. Air emissions after drying and purging must comply with GOST 17.2.3.02.

3.7. Ventilation of premises must ensure compliance with the air requirements of the working area in accordance with GOST 12.1.005.

Table 4

Maximum permissible concentrations of solvents in the air

Amendment No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, amended paragraph 3.8 of this OST, coming into force on July 1, 1987.

3.8. Analysis of sample air for the content of harmful substances should be carried out using methods developed in accordance withGOST12.1.014 And GOST12.1.016, methodological guidelines and other regulatory and technical documents approved by the USSR Ministry of Health.

ChangeN 1 , approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, amendments were made to paragraph 3.9 of this OST, which come into force on July 1, 1987.

3.9 .When degreasing with solvents of group 2 (see and), fire safety must be ensured in accordance with GOST 12.1.004, SNIP and PUE.

3.10. The amount of freon 113 and freon 114B2 poured into degreased systems or into auxiliary equipment should not exceed 0.3 kg per 1 m 3 of room.

Amendment No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, amended paragraph 3.11 of this OST, coming into force on July 1, 1987.

3.11. Before entering the room where degreasing is carried out, warning signs must be posted: “The solvent is poison”, “No unauthorized entry”, “No smoking” and other safety signs, in accordance with GOST 12.4.026.

3.12. Bottom residues of solvents must be delivered to the enterprises of the Ministry of Chemical Industry or must be regenerated by consumers.

3.13. Workers engaged in degreasing work must be provided with protective equipment in accordance with GOST 12.4.011.

Amendment No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, amended paragraph 3.14 of this OST, coming into force on July 1, 1987.

3.14. When using ultrasonic cleaning, you must comply with the requirements of GOST 12.1.001 and “Sanitary norms and rules when working on industrial ultrasonic installations” dated May 24, 1977.

3.15. When working with electrical appliances, you must comply with the requirementsGOST12.1.019.

3.16. Issues of draining residues of aqueous cleaning solutions and disposal must be resolved by the design organization in accordance with the current guidelines "Rules for the protection of surface waters from pollution by wastewater" N1166.

4. General technological requirements

4.1. The degreasing process consists of the following operations:

Preparation for degreasing;

Degreasing;

Removing residues of used degreasers.

4.2. Preparation for degreasing.

4.2.1. Before degreasing, the equipment must have a temperature from 12°C to 30°C.

If there is a technical need for degreasing at lower or higher temperatures, in each specific case, a special technological process must be developed.

Safety valves and instrumentation should be removed from the equipment and degreased separately.

4.2.2. Products coated with preservative lubricants must be depreserved in accordance with OST 26-04-2138 before degreasing with aqueous cleaning solutions or solvents.

4.2.3. Before degreasing with solvents, in order to avoid corrosion, the products must be thoroughly dried.

4.3. Degreasing.

When circulating the cleaning solution, the following conditions must be met:

The duration of circulation is at least 30 minutes, but not more than 2 hours;

The amount of circulating aqueous washing solution is not less than the volume of the products, while washing the entire degreased surface with the solution must be guaranteed;

Degreasing should be done twice with intermediate and final rinsing with hot water.

6.4. Degreasing of gasifier tanks is carried out by condensation of solvent vapors in accordance with the standard.

Evaporators are degreased using the solvent circulation method.

Degreasing ends when the content of fatty contaminants in the drained condensate is no more than 20 mg/dm 3 .

6.5. The spindle groups of fittings are degreased by wiping with aqueous cleaning solutions.

6.6. Degreasing spindle groups of fittings with solvents of group 1 of the standard is not allowed.

Degreasing evaporators with aqueous cleaning solutions is not allowed.

6.7. After degreasing, the gasifier is purged until the remaining solvent is completely removed. The complete removal of solvents must be verified by analysis.

The medical oxygen gasifier should be purged until there is complete absence of solvent vapor in the gas during control purging (no more than 2 mg/m3).

6.8. When using oxygen in a gasifier in accordance with GOST 6331, degreasing of the tank, valve cabinet and pipelines is not performed.

7. Degreasing oxygen compressors

7.1. Small parts are degreased according to the standard.

7.2. Valves should be degreased with solvents only in disassembled form.

7.3. Large parts, for example, a cylinder, cover, rods, pistons, etc., are degreased in baths with an aqueous washing solution or solvent, or by wiping the surfaces with napkins moistened with low-toxic solvents (see standard) or a hot water washing solution.

7.4. Shell-and-tube refrigerators, moisture separators, receivers and other containers are filled 1/3-1/2 of the volume with solvent, after which edging is performed. If parts are degreased after re-preservation, it is necessary to wash the parts two or three times with a solvent. It is recommended to degrease these devices by condensing solvent vapors or rinse them with a hot washing solution (see standard).

7.5. Coil refrigerators are degreased with a solvent or hot washing solution using the circulation or filling method (see standard).

7.6. After degreasing, the compressor must be run in air or nitrogen for 2 hours.

7.7. Degreasing of oxygen turbochargers is carried out in accordance with RTM 26-12-43.

8. Degreasing of pipelines and hoses

8.1. The need to degrease assembled pipelines with a pressure above 4.0 MPa (40 kgf/cm2) is determined by the technical documentation; the decision on degreasing is recommended to be made after monitoring the open ends of the pipeline, in accordance with OST 26-04-2574.

8.2. Liquid oxygen pipelines are checked for the presence of fatty contaminants at least once a year, in the event that they transport oxygen with a content of fatty contaminants higher than the requirements of GOST 6331.

Areas with the lowest flow speed are subjected to a control check for the presence of fatty contaminants, and with a uniform flow - inlet areas. Control is carried out in accordance with section 5 of the standard.

If the standard OST 26-04-1362 is exceeded, the entire pipeline is subjected to degreasing.

8.3. When degreasing by immersion in baths, pipes are placed in special baths filled with aqueous cleaning solutions or solvents and maintained in accordance with the requirements of the standard.

8.4. For degreasing by circulation, the pipelines are connected to a special system equipped with a pump, through which aqueous cleaning solutions or solvents are pumped (see standard).

8.5. Degreasing the internal surface of pipes using the filling method is carried out as follows: technological plugs are installed at the ends of the pipes. Solvent is poured into the plug through the corresponding fitting, after which the fitting is closed, and the pipes or hoses are laid horizontally. The pipes should remain in a horizontal position for 10-20 minutes, during which time they should be turned 3-4 times to wash the entire inner surface with solvent. Pipes filled with solvent can also be moved in special rockers or rotating mechanisms.

8.6. Sections of the installed pipeline are degreased by circulating a solvent and water-based cleaning solution.

8.7. The approximate consumption of solvent required for one-time degreasing of the internal surface of one linear meter of pipe is calculated using the formula:

(2)

Where Q- solvent consumption, dm 3 /m;

D- internal diameter of the pipe, cm.

Solvent consumption for one-time degreasing of pipes is given in table. 2.

table 2

Solvent consumption for one-time degreasing of pipes

Continuation of the table. 2

Continuation of the table. 2

8.8. Small sections of pipelines can be degreased by wiping or by jetting an aqueous cleaning solution using special devices.

8.9. During installation, the outer surfaces of the ends for a length of 0.5 m are wiped with napkins soaked in a solvent or aqueous washing solution and dried in the open air.

8.10. All parts intended for connecting hoses to the container must be degreased by wiping if they were possibly contaminated during storage.

8.11. The hoses of medical oxygen tanks are degreased along with the vessel.

8.12. Fat-free sections of pipelines to be stored or transported must be plugged and sealed.

8.13. Pipeline sections subjected to chemical passivation or other types of chemical surface treatment before assembly may not be degreased if the requirements of the standard are met.

8.14. Sections of pipelines and hoses that were degreased during manufacture, received for installation with plugs and have the appropriate marks in the passport, are not degreased.

8.15. Pipeline assemblies are not subject to degreasing at pressures up to 4.0 MPa (40 kgf/cm2), if sections of pipelines before assembly or pipeline assemblies were cleaned of scale, slag, etc. by etching, sandblasting and shot blasting.

8.16. Main pipelines and inter-shop oxygen pipelines, pressure up to 1.6 MPa (16 kgf/cm2), assemblies are not degreased if, before connecting individual pipes, a visual inspection confirms the absence of stains of greasy contaminants on the surface of the pipelines, for which a report must be drawn up.

9. Degreasing of fittings and devices

9.1. Degreasing is carried out after manufacturing, before installation and after repair, i.e. in cases where contamination of the fittings was possible.

9.2. The fittings are degreased in disassembled form with aqueous cleaning solutions. It is allowed to pre-wipe with a cloth soaked in white spirit or kerosene. In this case, special attention should be paid to fire safety measures.

9.3. In case of technical necessity, it is allowed to degrease the fittings without disassembling. To determine the possibility of degreasing purchased fittings without disassembling, it is recommended to degrease them, dry them, and then disassemble them and check for residual grease contaminants. If the residual content meets the standards, in accordance with. standard, in the future the fittings can be degreased without disassembling.

Particular attention should be paid to the oil seal and its packing.

9.4. When degreasing fittings without disassembling, one should take into account the compatibility of all materials from which the fittings are made, especially seals, with the detergents used.

9.5. The fittings are not subject to degreasing before installation if degreasing was carried out at the manufacturer (which must be confirmed by accompanying documents or appropriate markings) and the packaging is not damaged.

9.6. Rubber, paronite, fiber gaskets, fluoroplastic oil seal rings, parts made of fiberglass, polycarbonate and textolite are degreased by wiping with aqueous detergent solutions and rinsed with water.

9.7. Asbestos used for stuffing box fittings is degreased by calcination at a temperature of 300°C for 2-3 minutes.

9.8. Degreasing of instruments for measuring flow and pressure is carried out in accordance with OST 26-04-2158.

Appendix 3

Mandatory

Requirements for solvents

Incoming control

Appendix 4

Mandatory

Preparation of baths with aqueous cleaning solutions, their control and adjustment

1. Drawing up baths

1.1. The quantity of each component provided for in the recipe is calculated based on the composition of the bath and its useful capacity. The components of the solution, depending on local conditions, can be dissolved separately in auxiliary vessels or directly in the bath in which degreasing is carried out. Dissolution is carried out by heating to a temperature of 60-70°C with vigorous stirring of the solutions with mechanical stirrers or air bubbling.

1.2. After drawing up the bath, determine the total alkalinity of the freshly prepared composition according to the method given below.

2. Control and adjustment of baths

2.1. General requirements

2.1.1. Control analyzes of the composition of aqueous washing solutions in degreasing baths are carried out at least 2 times a week by determining the total alkalinity of the solution. The baths are adjusted based on the results of control tests. A general change of the water-washing solution with regular loading of the bath is carried out once a week.

2.1.2. When using baths, do not allow contaminants to accumulate on the surface of the solutions. Regularly remove fatty contaminants from the surface using special devices (with a holey spoon or mesh) or special grease traps.

2.1.3. Before taking a sample of the solution for control analysis, it is necessary to bring the solution to the required level and mix.

2.2. Determination of total alkalinity of a solution

Amendment No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, amended subparagraph 2.241 of this appendix, which comes into force on July 1, 1987.

Amendment No. 2 has been amended to subclause 2.2.1 of this appendix

2.2.1. Reagents, solutions and glassware used:

Hydrochloric acid, according to GOST 3118, 0.1 m solution;

Methyl orange indicator according to TU 6-09-5171, 0.1%;

Distilled water, according toGOST 6709;

Conical flasks, according to GOST 25336, with a capacity of 250 cm 3;

Measuring pipettes, according to GOST 1770, capacity 100 cm 3;

Measuring burette, according to GOST 1770, capacity 25 cm3.

2.2.2. To carry out the determination, place 5 cm 3 of a cooled aqueous washing solution in a conical flask with a capacity of 250 cm 3, dilute with water to 100 cm 3, add 2-3 drops of methyl orange solution and titrate with 0.1 N HCl until the yellow color changes to pale pink.

2.2.3. The total alkalinity of the solution in terms of NaOH in g/dm 3 is calculated using the formula:

Where q- amount of 0.1 N solution HCl, spent on titration, cm 3;

0.004 - solution titer HCl,G;

TO- correction to the titer of 0.1 N solution HCl;

m- amount of solution taken for analysis, cm3.

2.3. Bathtub adjustments

2.3.1. Based on the results of control analyses, the baths are adjusted if the total alkalinity of the solution decreases by more than 20%.

2.3.2. When adjusted, all components of the solution are added to the bath. The amount to be added is calculated based on the main component, which determines the total alkalinity of the solution. For example, according to a control analysis of a bath of the composition:

NaOH - 10 g; Na 3 PO 4 -15g; Na 2 SiO 3 -2 g; OP-7 - 2-3 g; H 2 O - 1 dm 3 total alkalinity decreased by 35%. When making adjustments, you need to add 3 to the bath at the rate of 1 dm3:

NaOH - 3.5 g; Na 2 SiO 3 - 0.7 g; Na 3 PO 4 - 5.2 g; OP-7 - 0.7-1 g.

Amendment No. 2 has been amended to this List

Amendment No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, amended this List and entered into force on July 1, 1987.

List of reference normative and technical documents (NTD)

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Industry standard

OST 26-04-312-83

Methods for degreasing equipment. General requirements for technological processes

(put into effect by letter of the Technical Department of the Ministry of Chemical Engineering dated November 29, 1983 N 11-10-4/1685)

Validity period established from January 1, 1985. Replaces OST 26-04-312-71 This standard applies to cryogenic, cryogenic-vacuum equipment and equipment working with oxygen, including medical oxygen, nitrogen and other air separation products, and establishes general technological requirements for methods of removing fatty contaminants from the surface of products (degreasing). The standard does not establish requirements for the processes of depreservation of products. Explanations of terms used in this standard are given in Reference Appendix 1.

1. General Provisions

2. Technical requirements

2.1. Material requirements

2.1.1. Solvents or aqueous cleaning solutions should be used to degrease equipment. The need to use solvents or aqueous cleaning solutions must be indicated in the technological documentation.

2.2. Solvents

2.2.1. Solvents are divided into two groups: Group 1 - fireproof, used for degreasing assembled products both at manufacturing plants and during equipment operation. Group 2 - fire and explosion hazardous, used for degreasing products by wiping, subject to the subsequent complete removal of solvents from the internal cavities of degreased products. When using solvents of group 2, conditions must be observed to ensure fire and explosion safety, in accordance with clause 3.9. The used solvents of groups 1 and 2, used at a temperature of 10-20 ° C, depending on the detergent and physicochemical properties, are given in table. 1. Change No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, introduced changes to subclause 2.2.2 of this OST, which come into force on July 1, 1987. 2.2.2. When degreasing materials other than those indicated in the table. 1, tests should be carried out for corrosion compatibility with solvents and for residual content of fatty contaminants.

Scope of solvents

Table 1

Permissible content of fatty contaminants

2.3. Aqueous cleaning solutions

2.3.1. Fireproof non-toxic aqueous cleaning solutions are used for degreasing assembled and disassembled products, the design of which ensures the possibility of completely draining the solution and removing its residues by rinsing with water, both at manufacturing plants and during installation and operation of equipment. Change No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, introduced changes to subclause 2.3.2 of this OST, which come into force on July 1, 1987. 2.3.2. The compositions of aqueous washing solutions, technological modes and scope of application, indicating the materials, are given in table. 3. Instructions for the preparation of baths with aqueous solutions, their control and adjustment are given in mandatory Appendix 4. Table 3

Compositions of aqueous cleaning solutions and degreasing modes

3. Safety requirements

Maximum permissible concentrations of solvents in the air

4. General technological requirements

5. Quality control of degreasing

Annex 1

Information

Explanation of terms

Appendix 2

Features of degreasing various types of equipment

1. General Provisions

Where S- inner surface of the vessel, m2; v- volume of oxygen poured or pumped into the vessel, dm 3; C - content of fatty contaminants in oxygen, mg/dm 3 ; n- number of fillings of the vessel; m- permissible content of fatty contaminants according to OST 26-04-1362 or GOST 12.2.052, mg/m 2. The equipment passport or other document must record the amount of oxygen passed and the content of fatty contaminants in it. Amendment No. 2 has supplemented this appendix with clause 1.3 1.3. The need to degrease oxygen equipment can be determined using test degreasing. If the design of the product allows, control degreasing should be carried out in places where fatty contaminants are most likely to be deposited and accumulated. The equipment may not be degreased if the oil content does not exceed the values ​​regulated by the regulatory and technical documents specified in clause 1.1. of this standard.

2. Degreasing of air separation units

Approximate solvent consumption for one-time washing of air separation units

3. Degreasing of cryogenic vessels, cylinders and transport tanks

4. Degreasing liquid oxygen pumps

5. Degreasing of gasification plants

The numbering of points is given in accordance with the source

6. Degreasing of cryogenic cold gasifiers type GKH

Where M- mass, t; F- internal area of ​​the gasifier panel, m2. Control degreasing is carried out with solvents of group 1 of table. 1 standard in an amount of 20-30% of the total volume poured. After control degreasing, the content of fatty contaminants in the solvent is determined in accordance with OST 26-04-2574. 6.2. Degreasing of the remaining evaporators is carried out if the content of fatty contaminants exceeds the permissible standards according to 26-04-1362. Degreasing is carried out using the circulation method with a solvent of group 1 of the table. 1 standard. 6.3. When using oxygen containing fatty contaminants of more than 0.01 mg/dm 3, the gasifier (tank, fitting cabinet, evaporators and pipelines) is degreased after the mass of oxygen determined according to clause 1.2 has passed through the tank. 6.4. Degreasing of gasifier tanks is carried out by condensation of solvent vapors in accordance with clause 4.3.5. standard Evaporators are degreased using the solvent circulation method. Degreasing ends when the content of fatty contaminants in the drained condensate is no more than 20 mg/dm 3 .6.5. The spindle groups of fittings are degreased by wiping with aqueous cleaning solutions. 6.6. Degreasing of spindle groups of fittings with solvents of group 1 of table. 1 standard is not allowed. Degreasing evaporators with aqueous cleaning solutions is not allowed. 6.7. After degreasing, the gasifier is purged until all remaining solvent is removed. The complete removal of solvents must be verified by analysis. The medical oxygen gasifier should be purged until there is no solvent vapor in the gas during control purging (no more than 2 mg/m3). 6.8. When using oxygen in a gasifier in accordance with GOST 6331, degreasing of the tank, fitting cabinet and pipelines is not carried out.

7. Degreasing oxygen compressors

8. Degreasing of pipelines and hoses

(2)

Where Q- solvent consumption, dm 3 /m; D- internal diameter of the pipe, cm. Solvent consumption for one-time degreasing of pipes is given in table. 2. Table 2

Solvent consumption for one-time degreasing of pipes

9. Degreasing of fittings and devices

Appendix 3

Mandatory

Requirements for solvents

Appendix 4

Mandatory

Preparation of baths with aqueous cleaning solutions, their control and adjustment

1. Drawing up baths

2. Control and adjustment of baths

2.1. General requirements

2.1.1. Control analyzes of the composition of aqueous washing solutions in degreasing baths are carried out at least 2 times a week by determining the total alkalinity of the solution. Baths are adjusted based on the results of control tests. A general change of the aqueous cleaning solution with regular loading of the bath is carried out once a week. 2.1.2. When using baths, do not allow contamination to accumulate on the surface of the solutions. Regularly remove grease from the surface using special devices (with a holey spoon or mesh) or special grease traps. 2.1.3. Before taking a sample of the solution for control analysis, it is necessary to bring the solution to the desired level and mix.

2.2. Determination of the total alkalinity of a solution

Where q- amount of 0.1 N solution HCl, spent on titration, cm 3; 0.004 - solution titer HCl, G; TO- correction to the titer of 0.1 N solution HCl;m- amount of solution taken for analysis, cm3.

2.3. Bathtub adjustments

2.3.1. Based on the results of control tests, the baths are adjusted if the total alkalinity of the solution decreases by more than 20%. 2.3.2. When making adjustments, add all components of the solution to the bath. The amount to be added is calculated based on the main component, which determines the total alkalinity of the solution. For example, according to a control analysis of a bath of the composition: NaOH - 10 g; Na 3 PO 4 -15 g; Na 2 SiO 3 -2 g; OP-7 - 2-3 g; H 2 O - 1 dm 3 total alkalinity decreased by 35%. When adjusting, it is necessary to add to the bath at the rate of 1 dm 3: NaOH - 3.5 g; Na 2 SiO 3 - 0.7 g; Na 3 PO 4 - 5.2 g; OP-7 - 0.7-1 g. Change No. 2 introduced changes to this ListChange No. 1, approved by the Deputy Minister of Chemical and Petroleum Engineering on January 4, 1987, introduced changes to this List that come into force on July 1, 1987.

List of reference normative and technical documents (NTD)