水泥试验方法 水泥中氯化物、二氧化碳和碱含量的测定

4.2.8 Ammonium iron (III) sulphate, FeNH₄(SO₄)₂ · 12H₂O.

4.2.9 Indicator solution

Add 10 ml of dilute nitric acid (1 + 2) to 100 ml of a cold saturated solution of ammonium iron (III) sulfate in water.

4.3 Apparatus

4.3.1 Balance, capable of weighing to an accuracy of 0,0001 g.

4.3.2 10 ml burette, with 0,1 ml scale intervals.

4.3.3 Desiccator, containing anhydrous magnesium perchlorate, Mg(ClO₄)₂.

4.3.4 Filter paper, coarse (of about 20 μm pore diameter).

4.3.5 5 ml pipette.

4.4 Procedure

Weigh (5 ± 0,05) g of cement and place it in a 250 ml beaker, add 50 ml of water and, while stirring with a glass rod, 50 ml of dilute nitric acid (1 + 2) (4.2.2). Heat the mixture to boiling, stirring occasionally, and boil for one minute. Add, by pipetting (4.3.5), 5 ml of silver nitrate solution (4.2.5) to the boiling solution. Then boil for a maximum of one minute and filter through a filter paper (4.3.4) washed before use with dilute nitric acid (1 + 100) (4.2.3), into a 500 ml flask. Wash the beaker, glass rod and filter paper with dilute nitric acid (1 + 100) until the volume of the filtrate and washings is 200 ml. Cool the filtrate and washings to below 25 °C. Add 5 ml indicator solution (4.2.9) and titrate with the ammonium thiocyanate solution (4.2.7), shaking vigorously until a drop of this solution produces a faint reddish-brown colour which does not disappear on shaking. Record the volume, V₁.

If the chloride content of cement exceeds 0,17 %, it will be necessary to repeat the test with a smaller quantity of cement.

Carry out the same procedure without cement sample (blank titration) and record the volume, V₂, of ammonium thiocyanate solution used.

4.5 Expression of results

Calculate the chloride ions content, as a percentage, from the formula:

Cl⁻ = (1,773 / 1000) · (V₂ − V₁) · (100 / m₁) = 0,17733 · ((V₂ − V₁) / m₁) (1)

where

m₁ is the mass of cement test portion;

V₁ is the volume of ammonium thiocyanate solution used for the titration of test solution;

V₂ is the volume of ammonium thiocyanate solution used for the titration of blank solution.

Calculate the mean from the two results, to the nearest 0,01 %.

4.6 Repeatability and reproducibility

The repeatability standard deviation is 0,005 % and the reproducibility standard deviation 0,010 %.

5 Determination of carbon dioxide content (reference method)

5.1 Principle

The cement sample is treated with phosphoric acid to decompose the carbonate present. The carbon dioxide liberated is entrained in a current of carbon dioxide-free gas or air through a series of absorption tubes. The first two remove hydrogen sulfide and water and the following then absorb carbon dioxide. Two absorption tubes, each containing a granular absorbent for carbon dioxide and anhydrous magnesium perchlorate to retain the water formed during the absorption reaction are weighed to determine the mass of carbon dioxide released.

5.2 Reagents

5.2.1 Copper sulfate, CuSO₄ · 5 H₂O.

5.2.2 Copper sulfate solution, saturated.

5.2.3 Absorbent for hydrogen sulfide

Place a weighed quantity of dried pumice stone with a particle size between 1,2 mm and 2,4 mm into a flat dish and cover with a volume of saturated copper sulfate solution so that the mass of copper sulfate solution is approximately half that of the pumice stone. Evaporate the mixture to dryness, while stirring frequently with a glass rod. Dry the contents of the dish for at least five hours in an oven at a temperature of (155 ± 5) °C. Allow the solid mixture to cool in a desiccator and store in an airtight bottle.

5.2.4 Absorbent for water, anhydrous magnesium perchlorate, Mg(ClO₄)₂, with a particle size between 0,6 mm and 1,2 mm.

5.2.5 Absorbent for carbon dioxide, synthetic silicates with a particle size between 0,6 mm to 1,2 mm²), impregnated with sodium hydroxide, NaOH.

5.2.6 Concentrated phosphoric acid, H₃PO₄.

5.2.7 Concentrated sulfuric acid, H₂SO₄.

5.3 Apparatus

5.3.1 Apparatus for determining the carbon dioxide content

Figure 1 shows a typical apparatus which can be fitted with either a cylindrical pressure vessel, a small electrical compressor or a suitable suction pump which will ensure an even flow of gas or air.

The gas (air or nitrogen) entering the apparatus has previously had its carbon dioxide removed by first being passed through an absorbent (5.2.5). The apparatus consists of a 100 ml reaction flask (A) fitted with a three-neck adaptor, neck B₁, being connected to a dropping funnel (O), neck B₂ to a connecting tube and neck C to a water-cooled condenser. The funnel on B₁ and the connecting tube on B₂ are joined by means of a Y-piece (P), so that the carbon dioxide-free air can flow either through the connecting tube or the funnel, which can be controlled by means of a Mohr clip (N). After the condenser (L), the gas is passed through concentrated sulfuric acid (D), through absorption tubes containing the absorbent for hydrogen sulfide (5.2.3) (E) and

2) The absorbent is available ready for use.

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2 Scope

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EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 10216-3

May 2002

ICS 23.040.10; 77.140.75

English version

Seamless steel tubes for pressure purposes –
Technical delivery conditions

Part 3: Alloy fine grain steel tubes

Tubes sans soudure en acier pour service sous pression – Conditions techniques de livraison – Partie 3: Tubes en acier allié à grain fin

Nahtlose Stahlrohre für Druckbeanspruchungen – Technische Lieferbedingungen – Teil 3: Rohre aus legierten Feinkornbaustählen

This European Standard was approved by CEN on 2002-04-25.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member.

The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom.

CEN

European Committee for Standardization

Comité Européen de Normalisation

Europäisches Komitee für Normung

Management Centre: rue de Stassart 36, B-1050 Brussels

© 2002. CEN – All rights of exploitation in any form and by any means reserved worldwide for CEN national members.

Ref. No. EN 10216-3 : 2002 E

Contents

Section	Page
Foreword	3
Introduction	4
1 Scope	4
2 Normative references	5
3 Definitions	5
3.1 DN	5
3.2 PN	5
4 Designations	6
4.1 Range of PN designations	6
4.2 Range of DN (nominal sizes)	6
4.3 Gasket types	6
4.4 Information to be supplied by the purchaser	6
5 Gasket designs	6
6 Gasket types	7
7 Dimensions	7
8 Marking	10
Annex A (informative) Information to be supplied by the purchaser	10
Annex B (informative) A-deviation	11

:current

Foreword

This document (EN 10216-3:2002) has been prepared by Technical Committee EC/TC 29, "Steel tubes and fittings for steel tubes", the secretariat of which is held by UNI.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002.

This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.

Other Parts of EN 10216 are:

Part 1:	Non-alloy steel tubes with specified room temperature properties
Part 2:	Non-alloy and alloy steel tubes with specified elevated temperature properties
Part 4:	Non-alloy and alloy steel tubes with specified low temperature properties
Part 5:	Stainless steel tubes

Another European Standard series covering tubes for pressure purposes is:

EN 10217:

Welded steel tubes for pressure purposes

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

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1 Scope

This Part of EN 10216 specifies the technical delivery conditions in two test categories for seamless tubes of circular cross section, made of weldable alloyed fine grained steel.

2 Normative references

This European Standard incorporates by date or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For date references, subsequent amendments to or revisions of, any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).

The requirements of this European Standard rule when they differ from those in the standards and documents referred to below:

EN 10002-1, Metallic materials - Tensile testing - Part 1: Method of test (at ambient temperature).

EN 10002-5, Metallic materials - Tensile testing - Part 5: Method of testing (at elevated temperature).

EN 10020, Definitions and classification of grades of steel.

EN 10021, General technical delivery requirements for steel and iron products.

EN 10045-1, Metallic materials - Charpy impact test - Part 1: Test method.

EN 10052, Vocabulary of heat treatment terms for ferrous products.

EN 10204, Metallic products - Types of inspection documents.

EN 10027-1, Designation systems for steels - Part 1: Steel names, principle symbols.

EN 10027-2, Designation systems for steels Part 2: Numerical systems.

ENV 10220, Seamless and welded steel tubes - Dimensions and masses per unit length

EN 10233, Metallic materials - Tubes - Flattening test.

EN 10234, Metallic materials - Tubes - Drift expanding test.

EN 10236, Metallic materials - Tubes - Ring expanding test.

EN 10237, Metallic materials - Tubes - Ring tensile test.

EN 10246-1, Non-Destructive Testing of steel tubes Part 1: Automatic electromagnetic testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness.

EN 10246-5, Non-Destructive Testing of steel tubes - Part 5: Automatic full peripheral magnetic transducer/flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal imperfections.

EN 10246-6, Non-Destructive Testing of steel tubes - Part 6: Automatic full peripheral ultrasonic testing of seamless steel tubes for the detection of transverse imperfections.

EN 10246-7, Non-Destructive Testing of steel tubes - Part 7: Automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections.

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