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GOST 28800-90

GOST R ISO 15353-2014 GOST P 55080-2012 GOST R ISO 16962-2012 GOST R ISO 10153-2011 GOST R ISO 10280-2010 GOST R ISO 4940-2010 GOST R ISO 4943-2010 GOST R ISO 14284-2009 GOST R ISO 9686-2009 GOST R ISO 13899-2-2009 GOST 18895-97 GOST 12361-2002 GOST 12359-99 GOST 12358-2002 GOST 12351-2003 GOST 12345-2001 GOST 12344-88 GOST 12350-78 GOST 12354-81 GOST 12346-78 GOST 12353-78 GOST 12348-78 GOST 12363-79 GOST 12360-82 GOST 17051-82 GOST 12349-83 GOST 12357-84 GOST 12365-84 GOST 12364-84 STATE STANDARD P 51576-2000 GOST 29117-91 GOST 12347-77 GOST 12355-78 GOST 12362-79 GOST 12352-81 GOST P 50424-92 STATE STANDARD P 51056-97 GOST P 51927-2002 GOST P 51928-2002 GOST 12356-81 GOST R ISO 13898-1-2006 GOST R ISO 13898-3-2007 GOST R ISO 13898-4-2007 GOST R ISO 13898-2-2006 STATE STANDARD P 52521-2006 GOST P 52519-2006 GOST R 52520-2006 GOST P 52518-2006 GOST 1429.14-2004 GOST 24903-81 GOST 22662-77 GOST 6012-2011 GOST 25283-93 GOST 18318-94 GOST 29006-91 GOST 16412.4-91 GOST 16412.7-91 GOST 25280-90 GOST 2171-90 GOST 23401-90 GOST 30642-99 GOST 25698-98 GOST 30550-98 GOST 18898-89 GOST 26849-86 GOST 26876-86 GOST 26239.5-84 GOST 26239.7-84 GOST 26239.3-84 GOST 25599.4-83 GOST 12226-80 GOST 23402-78 GOST 1429.9-77 GOST 1429.3-77 GOST 1429.5-77 GOST 19014.3-73 GOST 19014.1-73 GOST 17235-71 GOST 16412.5-91 GOST 29012-91 GOST 26528-98 GOST 18897-98 GOST 26529-85 GOST 26614-85 GOST 26239.2-84 GOST 26239.0-84 GOST 26239.8-84 GOST 25947-83 GOST 25599.3-83 GOST 22864-83 GOST 25599.1-83 GOST 25849-83 GOST 25281-82 GOST 22397-77 GOST 1429.11-77 GOST 1429.1-77 GOST 1429.13-77 GOST 1429.7-77 GOST 1429.0-77 GOST 20018-74 GOST 18317-94 STATE STANDARD P 52950-2008 GOST P 52951-2008 GOST 32597-2013 GOST P 56307-2014 GOST 33731-2016 GOST 3845-2017 STATE STANDARD P ISO 17640-2016 GOST 33368-2015 GOST 10692-2015 GOST P 55934-2013 GOST P 55435-2013 STATE STANDARD P 54907-2012 GOST 3845-75 GOST 11706-78 GOST 12501-67 GOST 8695-75 GOST 17410-78 GOST 19040-81 GOST 27450-87 GOST 28800-90 GOST 3728-78 GOST 30432-96 GOST 8694-75 GOST R ISO 10543-99 GOST R ISO 10124-99 GOST R ISO 10332-99 GOST 10692-80 GOST R ISO 17637-2014 GOST P 56143-2014 GOST R ISO 16918-1-2013 GOST R ISO 14250-2013 GOST P 55724-2013 GOST R ISO 22826-2012 GOST P 55143-2012 GOST P 55142-2012 GOST R ISO 17642-2-2012 GOST R ISO 17641-2-2012 GOST P 54566-2011 GOST 26877-2008 GOST R ISO 17641-1-2011 GOST R ISO 9016-2011 GOST R ISO 17642-1-2011 STATE STANDARD P 54790-2011 GOST P 54569-2011 GOST P 54570-2011 STATE STANDARD P 54153-2010 GOST R ISO 5178-2010 GOST R ISO 15792-2-2010 GOST R ISO 15792-3-2010 GOST P 53845-2010 GOST R ISO 4967-2009 GOST 6032-89 GOST 6032-2003 GOST 7566-94 GOST 27809-95 GOST 22974.9-96 GOST 22974.8-96 GOST 22974.7-96 GOST 22974.6-96 GOST 22974.5-96 GOST 22974.4-96 GOST 22974.3-96 GOST 22974.2-96 GOST 22974.1-96 GOST 22974.13-96 GOST 22974.12-96 GOST 22974.11-96 GOST 22974.10-96 GOST 22974.0-96 GOST 21639.9-93 GOST 21639.8-93 GOST 21639.7-93 GOST 21639.6-93 GOST 21639.5-93 GOST 21639.4-93 GOST 21639.3-93 GOST 21639.2-93 GOST 21639.0-93 GOST 12502-67 GOST 11878-66 GOST 1763-68 GOST 13585-68 GOST 16971-71 GOST 21639.10-76 GOST 2604.1-77 GOST 11930.7-79 GOST 23870-79 GOST 11930.12-79 GOST 24167-80 GOST 25536-82 GOST 22536.2-87 GOST 22536.11-87 GOST 22536.6-88 GOST 22536.10-88 GOST 17745-90 GOST 26877-91 GOST 8233-56 GOST 1778-70 GOST 10243-75 GOST 20487-75 GOST 12503-75 GOST 21548-76 GOST 21639.11-76 GOST 2604.8-77 GOST 23055-78 GOST 23046-78 GOST 11930.11-79 GOST 11930.1-79 GOST 11930.10-79 GOST 24715-81 GOST 5639-82 GOST 25225-82 GOST 2604.11-85 GOST 2604.4-87 GOST 22536.5-87 GOST 22536.7-88 GOST 6130-71 GOST 23240-78 GOST 3242-79 GOST 11930.3-79 GOST 11930.5-79 GOST 11930.9-79 GOST 11930.2-79 GOST 11930.0-79 GOST 23904-79 GOST 11930.6-79 GOST 7565-81 GOST 7122-81 GOST 2604.3-83 GOST 2604.5-84 GOST 26389-84 GOST 2604.7-84 GOST 28830-90 GOST 21639.1-90 GOST 5640-68 GOST 5657-69 GOST 20485-75 GOST 21549-76 GOST 21547-76 GOST 2604.6-77 GOST 22838-77 GOST 2604.10-77 GOST 11930.4-79 GOST 11930.8-79 GOST 2604.9-83 GOST 26388-84 GOST 14782-86 GOST 2604.2-86 GOST 21639.12-87 GOST 22536.8-87 GOST 22536.0-87 GOST 22536.3-88 GOST 22536.12-88 GOST 22536.9-88 GOST 22536.14-88 GOST 22536.4-88 GOST 22974.14-90 GOST 23338-91 GOST 2604.13-82 GOST 2604.14-82 GOST 22536.1-88 GOST 28277-89 GOST 16773-2003 GOST 7512-82 GOST 6996-66 GOST 12635-67 GOST 12637-67 GOST 12636-67 GOST 24648-90

GOST 28800−90 Pipe metal. Method for the determination of moisture on the internal surface of pipes


GOST 28800−90

Group В69

INTERSTATE STANDARD


PIPE METAL

Method for the determination of moisture on the internal surface of pipes

Metal pipes. Method for determination of moisture on the internal surface of pipes


ISS 17.040.30
AXTU 1709

Date of introduction 1991−07−01


INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of metallurgy of the USSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee on management of quality and standards from 19.12.90 N 3193

3. The standard fully complies ST SEV 6739−89

4. INTRODUCED FOR THE FIRST TIME

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

   
The designation of the reference document referenced
The partition number
GOST 4204−77
2
GOST 9293−74
2
GOST 13374−86
2

6. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

7. REPRINTING. September 2010


This standard specifies a method for determining the moisture on the internal surface of metallic pipes with outer diameter from 3 to 54 mm, designed for use in refrigeration plants using refrigerants.

The method is based on purging the sample tube, dried with nitrogen, the subsequent absorption of moisture by the pentoxide of phosphorus, which is in a V-shaped tubes of the test set, determining the change in mass and the conversion of the mass of moisture per unit area.

1. METHOD SAMPLE SELECTION AND PREPARATION

1.1. The sample size and location sampling set in the normative-technical documentation for pipe.

1.2. For the test samples of pipe are selected so that the inner surface was not less than 0.2 mГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб.

2. EQUIPMENT AND REAGENTS


Installation for testing is going according to the scheme indicated in the drawing.

Drawing. Diagram of the setup for the test

ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб

Cylinder filled with nitrogen, and containing not more than 0.5% volume of oxygen.

The regulating valve.

Drying tower with tube, with a capacity of 250−500 cmГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб, filled with glass wool and phosphorus pentoxide.

The heating chamber.

V-shaped glass tube (2 PCs) with a diameter of 14.5 mm and a height of 80−100 mm with a glass tube filled with glass wool and phosphorus pentoxide.

A flow meter.

Analytical scales with the greatest limit of weighing of 200 g and a measurement error of ±0.1 mg.

Timers bubbles (2 pieces) filled with concentrated sulfuric acid.

A glass or copper tube to connect with the sample.

Heat resistant rubber hose for connection of the ends of the tubes.

Of phosphorus pentoxide.

Wool.

Sulfuric acid according to GOST 4204.

Vacuum oil GOST 13374 for sealing the lapped traffic of V-shaped tubes.

Nitrogen according to GOST 9293.

3. PREPARING FOR THE TEST

3.1. Before testing, the V-shaped tube containing phosphorus pentoxide, weighed with an accuracy of 0.1 mg.

3.2. Installation preparation to the test

The test set is collected without the test sample.

Extending from the drying tower (4) pipeline connects the V-shaped tube (7). Then, after the installation of the missing nitrogen with a flow rate of 5 l·hГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб. V-shaped tubes (7 and 8) is removed from the test set and weighed. This process is repeated until constancy of mass (ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб).

Constant mass is considered reached when the mass difference of the two weighings after transmission of nitrogen (not less than 5 h) not more than 1 mg.

4. TESTING

4.1. The test is performed as follows: nitrogen from the cylinder 1 through the valve 2 and the timer bubbles 3 is passed through a drying tower 4 and through the sample 6placed in a heating chamber 5. There nitrogen absorbs evaporating due to the heating of moisture that flows through the V-shaped tube 7 and 8, is filled with phosphorus pentoxide, where the moisture is absorbed.

After passing through the timers of the bubbles 9 and flow meter 10, the nitrogen is released into the air.

The timers of the bubbles 3 and 9 serve as a safety device against the penetration of atmospheric moisture into the instrument.

4.2. The flow passing in nitrogen during testing should be between 5 and 10 l·hГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб.
________________
* The text of the document matches the original. — Note the manufacturer’s database.

4.3. Testing time — not less than 3 hours.

4.4. During the test, the specimen is heated to a temperature of (105+5)°C.

4.5. After a time of testing both V-shaped tube filled with phosphorus pentoxide, and weighed to determine the change in their mass. To prevent weighing errors due to fluctuations in temperature and air pressure the weight gain of the first V-shaped tube are corrected by changing the mass of the second V-shaped tube in the following way:

— in case of weight gain the second V-shaped tube 8 is subtracted from her weight gain the first V-shaped tube 7;

— in the case of reducing the mass of the second V-shaped tube 8 is added to her weight gain the first V-shaped tube 7.

5. PROCESSING OF THE RESULTS

5.1. A lot of moisture (ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб) in milligrams is calculated by the formula:

— if weight gain second V-shaped tube 8

ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб;


— by reducing the mass of the second V-shaped tube 8

ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб,


where ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности трубis the change of mass of the first V-shaped tube 7, mg;

ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности трубabsolute mass changes of the V-shaped tube 8, mg.

5.2. A lot of moisture (aГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб), in milligrams per square meter of the inner surface of the sample, is calculated by the formula

ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб,

where ГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности трубis the internal surface area of the specimen, mГОСТ 28800-90 Трубы металлические. Метод определения влаги на внутренней поверхности труб.