500336- ASTM D5236 Pumping Line


500336- ASTM D5236 Pumping Line


500334- ASTM D5236 Secondary Dry Ice Trap Condenser

SKU: 500336-5236
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ASTM D5236 Pumping line for use with secondary dry ice trap Condenser

This pumping line is used in conjunction with 500334- Secondary Dry Ice Trap Condenser. Fit all systems. 1in beaded pipe vacuum port, 2in beaded pipe connection to attach to secondary dry ice trap condenser, 2mm stopcock.


Every fractionator reaches a limit above which it cannot operate. This limit is imposed by the pressure gradient in the packed column (10-15 mm Hg) which cause the vapors at the bottom of the tower to be hotter than those at the top. This difference, coupled with the temperature differential between the vapors and the liquid in the kettle is often 66°C. In the case of a crude oil distillation, the liquid is brought to the point of thermal cracking in a short period of time. Operating at 329°C for more than 30 minutes, significant cracking will take place altering the composition of the product taken off. This will correspond to an overhead cut off point of 343°C to 427°C AET depending on the gravity of the charge. To overcome thermal cracking, the fractionating tower with its packing must be eliminated and a still in which no significant pressure gradient occurs during operation must be used. The H.S. Martin HIVAC Still, which is a simple one-plate distillation, is ideally suited. The HIVAC Still takes over where the fractionators leave off and can distill overhead fractions from crudes and similar mixtures up to a cut point of 565°C AET depending on the gravity of the residue and also limited by the heat tolerance of the charge. The 329°C temperature limit still applies, but the pressure drop in operation is less than 100 microns (0.1 mmHg) which permits the the still to take over hotter vapors: i.e., heavier distillate.

Standard Test Method for Distillation of Heavy Hydrocarbon Mixtures (Vacuum Potstill Method)

Significance and Use


1. Scope

1.1 This test method covers the procedure for distillation of heavy hydrocarbon mixtures having initial boiling points greater than 150°C (300°F), such as heavy crude oils, petroleum distillates, residues, and synthetic mixtures. It employs a potstill with a low pressure drop entrainment separator operated under total takeoff conditions. Distillation conditions and equipment performance criteria are specified and typical apparatus is illustrated.

1.2 This test method details the procedures for the production of distillate fractions of standardized quality in the gas oil and lubricating oil range as well as the production of standard residua. In addition, it provides for the determination of standard distillation curves to the highest atmospheric equivalent temperature possible by conventional distillation.

1.3 The maximum achievable atmospheric equivalent temperature (AET) is dependent upon the heat tolerance of the charge. For most samples, a temperature up to 565°C (10570°F) can be attained. This maximum will be significantly lower for heat sensitive samples (for example, heavy residues) and might be somewhat higher for nonheat sensitive samples.

1.4 The recommended distillation method for crude oils up to cutpoint 400°C (752°F) AET is Test Method D 2892. This test method can be used for heavy crude oils with initial boiling points greater than 150—C (302°F). However, distillation curves and fraction qualities obtained by these methods are not comparable.

1.5 This test method contains the following annexes:

1.5.1 Annex A1—Test Method for Determination of the Temperature Response Time,

1.5.2 Annex A2—Practice for Calibration of Sensors,

1.5.3 Annex A3—Test Method for Dehydration of a Wet Sample of Oil,

1.5.4 Annex A4—Practice for Conversion of Observed Vapor Temperature to Atmospheric Equivalent Temperature (AET), and

1.5.5 Annex A5—Test Method for Determination of Wettage.

1.6 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are provided for information purposes only.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warnings see,, 6.9.3, 9.5, 9.6 and A2.3.1.3.


2. Referenced Documents (purchase separately) 

ASTM Standards

D941 Test Method for Density and Relative Density (Specific Gravity) of Liquids by Lipkin Bicapillary Pycnometer

D1217 Test Method for Density and Relative Density (Specific Gravity) of Liquids by Bingham Pycnometer

D1250 Guide for Use of the Petroleum Measurement Tables

D1298 Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method

D1480 Test Method for Density and Relative Density (Specific Gravity) of Viscous Materials by Bingham Pycnometer

D2892 Test Method for Distillation of Crude Petroleum (15-Theoretical Plate Column)

D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products

D5002 Test Method for Density and Relative Density of Crude Oils by Digital Density Analyzer


Crude Oil – Liquid Fuels – Petrochemicals – Vacuum Distillation

ICS Code

ICS Number Code 71.080.01 (Organic chemicals in general)


UNSPSC Code 15101500(Petroleum and distillates)

Referencing This Standard
Link Here
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DOI: 10.1520/D5236-02

Citation Format

ASTM D5236-02, Standard Test Method for Distillation of Heavy Hydrocarbon Mixtures (Vacuum Potstill Method), ASTM International, West Conshohocken, PA, 2002, www.astm.org

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