DCG’s Cylinder Heat Blankets are insulation jackets for gas cylinders.

The heat blanket fits securely around the cylinder for condensation control, pressure increase, and temperature control utilized in both laboratory and field environments (including in extreme weather conditions).

According to American Petroleum Institute (API) the requirements are that, “the collecting and handling of Natural Gas Samples for Custody Transfer concentrate on proper sampling systems and procedures. It recognizes the critical impact of hydrocarbon dew point consideration to the overall accuracy and success of these practices and procedures. Analyses of gas samples are used for many purposes and are applied to various calculations, some of which have an impact on the accuracy of custody transfer calculations,” (API MPMS 7th Edition 5/2016).

Your reference materials represent significant investments of time and money to comply with these requirements. Exposing calibration standards to temperatures below their Hydrocarbon Dew Point may cause stratification, with the heavier components settling to the bottom of the cylinder and the lighter components collecting near the top. Opening the cylinder valve in this condition will release the lighter components, altering the composition of the reference material. When this occurs, the quality of your reference materials will be compromised, and each component’s actual concentration will change. Certain values will increase while others will decrease. Either way, the analytical data will be inaccurate, the long hours spent analyzing will be wasted and the reference materials will be ruined causing an issue for accurate custody transfer of the product.

You can protect your reference materials from temperature induced stratification with DCG’s custom designed and manufactured Heated Products.  These products provide sufficient power to overcome the most inclement weather conditions and/or assist in obtaining the correct constant temperature in the laboratory to maintain the standard above the hydrocarbon dew point for analysis.

DCG’s Cylinder Heat Blankets are fastened with stainless steel buckles with a hook and loop closure to seal the opening and minimize heat loss. Paired with Heated Trace Lines the combination ensures that the products stay in a single phase or constant temperature.

Heat Trace Lines are designed to provide freeze protection or process temperature maintenance to ensure sampling systems stay in homogeneous gas phase state. This will ensure the gas will not condensate which would cause one to lose BTU’s and the density of the sample to be incorrect. The tubing is designed for use in ordinary (nonclassified) areas and hazardous (classified) areas.

DCG Cylinder Heat Blankets are available in various sizes and applications – As per API, Reference Materials shall be heated for a minimum period of 4 hours after the skin temperature of the cylinder reaches 30oF (17oC) above the calculated hydrocarbon dew point. This will ensure a homogeneous mixture, eliminating the possibility of the heavier hydrocarbons from dropping out of the certified reference material. DCG Partnership Cylinder Heat Blankets are designed to be use on high or low pressure, steel or aluminum cylinders of different sizes.

Models LP 239, LP 143, Size 300, Size 200, AL 150 and AL 30 are used only on cylinders without collar, and Model LP 5 can be used on both with or without collar. For other models, we offer custom designs, please contact DCG customer services for more information.

Sample Cylinder Heat Blankets meet these standards:

    • API MPMS
    • API MPMS
    • API MPMS
    • Heat trace tubing: API MPMS
    • 1/8” stainless steel seamless tubing @ 8 watts per foot (other sizes available)
    • Kits, thermostats, accessories, and instruction manuals necessary for heat trace tubing installation

*Note: All DCG Heated Products meet or exceed the requirements of API in Chapter 14 Natural Gas Fluids Measurement, Section 1—Collecting and Handling of Natural Gas Samples for Custody Transfer.

*GPA 2261 8.1.4 – Calibration Gas Standards Specifications

Please contact DCG customer services for more information.