Channel Supplies

Gauging Sampling & Testing Supplies

Kerrville, Texas

Ph: 830-792-5538

Email : sales@channelsupplies.com

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Testing Equipment
Hydrometers
Combined Form Hydrometer
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Combined Form Hydrometer

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ThermoHydrometer 59-71 Gravity / Safety Blue
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ThermoHydrometer 69-81 Gravity / Mercury Filled
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ThermoHydrometer 69-81 Gravity / Safety Blue
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ThermoHydrometer 79-91 Gravity / Mercury Filled
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ThermoHydrometer 79-91 Gravity / Mercury Filled
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ThermoHydrometer 79-91 Gravity / Safety Blue
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ThermoHydrometer 9-21 Gravity / Mercury Filled
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ThermoHydrometer 9-21 Gravity / Safety Blue
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© 2026 Channel Supplies | P.O. Box 291385 Kerrville, TX 78029 | 830-792-5538 | sales@channelsupplies.com

DuPont™ and NOMEX® are trademarks or registered trademarks of E.I. du Pont de Nemours and Company.

© Channel Supplies 2026-2027 All Images, Logos, Trademarks or Registered Trademarks of Channel Supplies can not be copied, reproduced or distributed without the express written consent of Channel Supplies

Channel Supplies Petroleum Volume Calculator

These Tables 5A/5B and 6A/6B are developed by Channel Supplies calculations and are not made part of or intended to imply they are the official API/ASTM Tables. User should check their work against current official API/ASTM Tables.

I have read and agree to this disclaimer

API gravity table VCF table API gravity at observed temperature Observed liquid temperature (°F) Total observed volume (barrels) BS&W (% of GOV) Total observed free water (barrels)

Optional tank-shell expansion estimate Apply approximate tank-shell expansion correction

Material linear expansion coefficient (per °F) Mean tank-shell temperature (°F) Tank calibration shell temperature (°F)

This calculator is offered AS IS for use FREE from Channel Supplies. CHECK YOUR WORK! Channel Supplies makes no claim to the accuracy of the results obtained from the use of this calculator. You are encouraged to use only the official API/ASTM Tables for any official work involving any Custody Transfer.

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