Lpg Liquefied Petroleum Gases

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PCTTS 59: 20XX

ii

GENERAL STATEMENT

The Trinidad and Tobago Bureau of Standards (the Bureau) is a body corporate established underthe authority of the Standards Act No. 18 of 1997 (herein after referred to as the Standards Act).

In accordance with the Standards Act, the Bureau shall promote and encourage the development and

maintenance of standards and further shall establish standards for the following: to improve goods

produced or used in Trinidad and Tobago; to ensure industrial efficiency and development; to promote

public and industrial welfare, health and safety; and to protect the environment.

The Bureau develops standards through consultation with relevant interest groups, and public

comment is invited on all draft standards before they are declared as Trinidad and Tobago Standards

in accordance with the provisions of the Standards Act.

The Bureau is the legal custodian of Trinidad and Tobago Standard Marks, which are issued inaccordance with the Standards Act. When a Trinidad and Tobago Standard Mark appears on any

product, or in connection with any service, process or practice, it provides assurance that such a

product, service, process or practice conforms to a Trinidad and Tobago Standard.

The Bureau’s Standards Information Centre maintains a reference library of standards, including local,

regional and international standards and is the national node of the International Organization for

Standardization Information Network (ISONET). The Centre also acts as the sales agent for the

publications of foreign and international standards organizations.

NOTE In order to keep abreast of progress in the industries concerned, Trinidad and Tobago Standards are

subject to periodic review. Suggestions for improvements are welcome.



PCTTS 59: 20XX

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AMENDMENTS ISSUED SINCE PUBLICATION

AMENDMENT NO. DATE OF ISSUE TEXT AFFECTED



PCTTS 59: 20XX

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ATTACHMENT PAGE FOR TTBS AMENDMENT SHEETS



PCTTS 59: 20XX

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TRINIDAD AND TOBAGO STANDARD

SPECIFICATION FOR LIQUEFIED PETROLEUM GASES (LPG)

TTS 59: 20XX

The Specification Committee responsible for the formulation of this Trinidad and Tobago Standard is

as follows:

SPECIFICATION COMMITTEE FOR LIQUEFIED PETROLEUM GASES

Members Representing

Dr. Angelus Pilgrim (Chairman) University of the West Indies, Facultyof Engineering

Mr. Steve Hilaire Petroleum Company of Trinidad andTobago Limited

Mr. Adrian Nunez Phoenix Park Gas Processors LimitedMr. Rawle Maicoo

Mr. Fazal Khan Ministry of Works

Mr. Kishan Kumarsingh Environmental Management Authority

Mr. Shiraz Mohammed Academy of Automechanics

Ms. Eka Rudder-Fairman Caribbean Research Institute (CARIRI)

Mr Wendell Williams Automotive Dealers Association ofTrinidad and Tobago (ADATT)

Mr. Ricardo Rodriguez (Technical Secretary) Trinidad and Tobago Bureau of Standards



PCTTS 59: 20XX

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Contents

Foreword ................................................................................................................................................. 1

1 Scope ...................................................................................................................................................... 2

2 Normative references.............................................................................................................................. 2

3 Terms and definitions.............................................................................................................................. 3

4 General requirements ............................................................................................................................. 4 4.1 General ................................................................................................................................................... 4

4.2 Composition of LPG................................................................................................................................ 4

4.3 Stenching of LPG.................................................................................................................................... 4

5 Sampling ................................................................................................................................................. 4

6 Testing..................................................................................................................................................... 4

Table 1 — Requirements for Liquefied Petroleum Gases .................................................................................... 5



PCTTS 59: 20XX

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PCTTS 59: 20XX

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Foreword

These requirements were declared a Trinidad and Tobago Standard on ……………., after the draftfinalized by the Specification Committee for Liquefied Petroleum Gases (LPG), had been approved bythe Bureau.

The Trinidad and Tobago Bureau of Standards has recommended that this standard be declared acompulsory standard to protect the consumer or user against danger to health and safety, to protectthe environment and to ensure a minimum acceptable quality of LPG produced in Trinidad andTobago.

This first revision of the standard will become effective as a compulsory standard on a date to benotified by the Minister responsible for trade and industrial development, in a notice to be published inthe Trinidad and Tobago Gazette, as required by the Standards Act. This revised version replacesTTS 11 40 500: 1979 and contains updated test methods for the composition, volatile residue, total

sulphur content and stenching of LPG

By specifying the blends, it is expected that acceptable product quality will be established and usedfor ensuring LPG compliance. As a safety feature, a limit for a stenching agent has been included forleak detection.

Although the procedure for the use of LPG is noted to be fairly safe, the user is reminded of thepotential dangers that exist for a pressured system. One such danger is that of explosion, and usersare encouraged to store LPG tanks away from open flames or a safe distance away from hightemperature operations.

In preparing this standard the following references were consulted:

a) International Organization for Standardization

ISO 9162-1989, Petroleum products - Fuels (Class F);

b) American Society for Testing and Materials

ASTM D 1835-05, Standard specification for liquefied petroleum (LP) gases; and

c) Gas Processors Association

GPA 2140-91, Standard method for test for LPG - Specifications for liquefied petroleum gasesand test methods, USA.



PCTTS 59: 20XX

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1 Scope

This standard specifies the requirements for the sampling, testing methods and determining thequality of liquefied petroleum gases (LPG) in Trinidad and Tobago.

The requirements of this standard do not apply to the quality of LPG for use as an aerosol propellantor as petrochemical feedstock or for any other industrial uses.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constituteprovisions of this national standard. For all referenced standards, subsequent amendments to or

revisions of any of these publications shall apply.

2.1 ASTM International

ASTM D 1265-05 Standard practice for sampling liquefied petroleum LP gases (manual method).

ASTM D 1267-02 (2007) Standard test method for vapour pressure liquefied petroleum gases.

ASTM D 1835-05 Standard specification for liquefied petroleum (LP) gases.

ASTM D 1837-02a (2007) Standard test method for volatility of liquefied petroleum gases.

ASTM D 1838-07 Standard test method for copper strip corrosion by liquefied petroleum gases.

ASTM D 2158-05 Standard test method for residues in liquefied petroleum gases.

ASTM D 2597-94 (2004) Standard test method for analysis of demethanized hydrocarbon liquidmixtures containing nitrogen and carbon dioxide by gas chromatography.

ASTM D 2598-02 (2007) Standard practice method for calculation or certain physical properties ofliquefied petroleum gases from compositional analysis.

ASTM D 2713-91 (2001) Standard test method for dryness of propane (Valve freeze method).

ASTM D 3120-06 e1 Standard test method for trace quantities of sulphur in light liquid petroleum

hydrocarbons by oxidative microcoulometry.

ASTM D 3246-05 Standard test method for sulphur in petroleum gas by oxidative microcoulometry.

ASTM D 3700-07 Standard practice for obtaining LPG samples using a floating piston cylinder.

ASTM D 5305-97 Standard test method for determination of ethyl mercaptan in LP-gas vapour.

ASTM D 5453-06 Standard test method for determination of total sulphur in light hydrocarbons, sparkignition engine fuel, diesel engine fuel and engine oil by ultraviolet fluorescence.



PCTTS 59: 20XX

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2.2 International Organization for Standardization

ISO 3993-1984 Liquefied petroleum gas and light hydrocarbons - Determination of density or relativedensity - Pressure hydrometer method.

ISO 4256-1996 Liquefied petroleum gases - Determination of vapour pressure - LPG method.

ISO 4257-2001 Liquefied petroleum gases - Method of sampling.

ISO 4267-2: 1988 Petroleum and liquefied petroleum products - Calculation of oil quantities - Part 2:Dynamic measurement.

ISO 6251-1996 Liquefied petroleum gases - Corrosiveness to copper - Copper strip test.

ISO 7941-1988 Commercial propane and butane - Analysis by gas chromatography.

ISO 8819-1993 Liquefied petroleum gases - Detection of hydrogen sulphide - Lead acetate method.

ISO 9162-1989 Petroleum products - Fuels (class F) - Liquefied petroleum gases – Specifications.

3 Terms and definitions

For the purposes of this national standard, the following terms and definitions shall apply.

3.1 commercial means used for domestic or industrial purposes.

3.2 commercial butane means a hydrocarbon product for use where low volatility is required.

3.3 commercial propane/butane mixtures mean mixtures of propane and butane for use whereintermediate volatility is required.

3.4 commercial propane means a hydrocarbon product for use where high volatility is required.

NOTE Commercial propane is suitable for certain low severity internal combustion engine applications.

3.5 LPG means liquid petroleum gases consisting of commercial butane, commercial propane,commercial butane-propane mixtures and special duty propane blends.

3.6 residual matter means a measure of the concentration of soluble hydrocarbon materials

present in the product which are substantially less volatile than the liquefied petroleum gas productbeing sampled.

3.7 special duty propane means a high quality product composed primarily of propane, whichexhibits superior anti-knock characteristics when used in an internal combustion engine.

3.8 vapour pressure means an indirect measure of the most extreme low temperature conditionsunder which initial vaporization can be expected to take place.



PCTTS 59: 20XX

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4 General requirements

4.1 General

4.1.1 Liquefied petroleum gases (LPG) shall consist essentially of C3 and C4 alkanes or alkenes, ormixtures of these.

4.1.2 Liquefied petroleum gases shall not contain inherent harmful quantities of toxic or nauseatingsubstances and shall be free from entrained water.

4.2 Composition of LPG

4.2.1 Commercial Butane - Propane Mixture - shall be a hydrocarbon mixture consisting of: not lessthan seventy percent (70%) by liquid volume of commercial propane; and commercial butane.

4.2.2 Special duty propane shall be a product comprising propane of not less than ninety percent(90%) liquid volume.

4.2.3 The additional requirements for the commercial butane, commercial propane, commercialpropane - butane mixtures and special duty propane are listed in Table 1, together with the limits andrecommended methods of test.

4.2.4 Commercial butane and commercial propane shall have composition as stated in Table 1 andshall not contain free or suspended water detectable by visual inspection.

4.3 Stenching of LPG

All LPG gases shall be odorized by the addition of a stenching agent that is rendered distinctive andunpleasant, prior to the delivery to a distributing plant. Such a stenching agent shall be detectable, bya distinct odour, down to a concentration in air of not over 20% of the lower limit of flammability whentested in accordance with ASTM D 5305.

5 Sampling

To ensure the integrity and reliability of test results proper sampling techniques are important.Samples shall be drawn in accordance with ASTM D 1265, ASTM D 3700 or ISO 4257. Where thereis a dispute over sampling integrity between ASTM D1265 and ASTM D 3700 requirements, ISO 4257shall be used as the referee sampling procedure.

6 Testing

All liquid petroleum gas samples drawn according to the requirements of clause 5 shall have theirvarious compositions tested in accordance with the test methods of Table 1.



PCTTS 59: 20XX

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Table 1 — Requirements for liquefied petroleum gases

Requirements Commercialbutane

Commercialpropane

Commercialbutane/propane

mixture

Special dutypropane

Test methods

Composition Predominantlybutane and maycontain butylene

Predominantlypropane and maycontain propylene

Mixture of butanesand/or propylene

not less than90% liquid

volumepercentpropane

ASTM D 2597ISO 7941

Vapour pressure at37.8

oC kPa (max)

(psig) (max)

483

70

1 434

208

1 434

208

1 434

208

ASTM D 1267 ASTM D 2598

ISO 4256

2.2 -38.3 2.2 -38.3 ASTM D 1837Volatile Residue:

Temp. 95%evaporation

oC

(max)

Butane and heavier,liquid volume %(max)

- 2.5-

2.5ISO 7941

ASTM D 2597

Pentane and

heavier, liquid

volume % (max)

2.0 - 2.0 -ISO 7941

ASTM D 2597

Propylene,volume % (max)

- - - 5.0 ASTM D 2597

Residual Matter onevaporation, ml per100 ml (max)

- .05 - .05 ASTM D 2158

Copper StripCorrosion (max)

No 1 No 1 No 1 No 1 ISO 6251 ASTM D 1838

aTotal sulphur (on

the unstenchedproduct), ppmwmg/kg (max)

140 180 180 123 ISO 8819 ASTM D 5453 ASTM D 3246

Free water content None - None - ASTM D 1835

Moisture content - Pass - Pass ASTM D 2713

Stenching limit ASTM D 530510 – 50 ppm

a Total sulphur limits do not include stenching agent.

Lpg Liquefied Petroleum Gases

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