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Technical FAQ

How do I choose the correct heat transfer fluid?

When choosing a heat transfer fluid, consider the temperature production requirement as well as the longest required service life of the heat transfer fluid to ensure the long-term, stable, and efficient operation of your system. The maximum working temperature of the selected heat transfer fluid should be at least 10° higher than the temperature range required during its use to ensure safe operation and to prevent overheating and degradation of the heat transfer fluid. For applications in heating and cooling or for systems operating outdoors in cold areas, the low-temperature fluidity of the heat transfer fluid should also be considered. Other factors that need careful consideration are the heat stability, flammability, corrosiveness, and other engineering properties of the operating system as well as cost and other factors based on the system design requirements. When selecting a renewable and environmentally friendly heat transfer fluid, SCHULTZ will be your optimal choice. As one of the top three global super-high-temperature and synthetic heat transfer fluid manufacturers, SCHULTZ boasts a highly vertically integrated production line that can completely meet your demands for quantity and quality of heat transfer fluids. It will provide you with technical support covering the technological process and operation instructions, effectively prolonging the service life of your heat transfer fluid, bringing you convenient, pleasant, economical, and trouble-free user experience, and providing you with comprehensive support to achieve your business goals.

The company has been engaged in research on heat transfer oil and heat transfer oil heating technology, accumulated rich experience. The company also provides technical services below to its customers when signing the contract:


1. Debugging of Heat Transfer Oil System
a. Provide reasonable suggestions and technical consultancy about the new system;
b. Provide personnel trainings, driving instructions, operation and management, system debugging notes;


2. Online heat transfer oil analysis
a. Carry out online heat transfer oil analysis every half a year to prevent oil damage caused by contaminations, oxidation, etc;
b. Put forward reasonable suggestions to improve oil quality based on results of online heat transfer oil analysis;


3. Hydrogenation Regeneration of Heat Transfer Oil
S750 hydrogenated terphenyl used for more than five years have been replaced gradually, but its components include nearly 60% usable substances, which should be hydrogenated under high pressure to recover original quality to be used together with newly supplemented S750 hydrogenated terphenyl heat transfer oil. Otherwise, inorganic and oxide substances in the original oil will cause loss of new oil quality quickly and shorten the service life. Hydrogenation regeneration is applied to restore the quality of the original oil and cut down running costs of the heat transfer oil remarkably.


4. Analysis and Handling of Accidents
The company owns senior talents of using high temperature heat conduction oil and rich production & practice experience, so it could assist customers with analyzing causes of heat transfer oil system accidents, provide handling suggestions and remedial measures, and Solve practical problems in system operation.


5. Emergency Goods Supply
In case of emergency demands, customers may contact the company and timely goods supply is guaranteed.
Tel: 778-383-2793 ; Fax: 604-738-5988

What are the common faults of heat transfer fluid use?

common faults may be caused by the following four reasons during long-term use of heat transfer fluid:

  1. Overheating: overheating may cause severe thermal cracking of the heat transfer fluid, forming splitting that causes coking, leading to deterioration of the heat transfer properties and may even result in accidents.
  2. Oxidation: oxidizing reactions change the original structure of the heat transfer fluid, generating macro-molecules and micro-molecules, and thus changing the original features of the heat transfer fluid.
  3. Pollution: chemicals and raw material from the machinery and equipment may enter the heat transfer fluid, leading to chemical reactions between the pollutants and the heat transfer fluid, reducing the heat transfer performance and even causing accidents. As the heat stability and chemical and physical properties of the pollutants differ from those of the heat transfer fluid, during high-temperature operation, the pollutants will deteriorate first, and the existence of deteriorated substances will affect the quality of the heat transfer fluid.
  4. Leakage: leakage of high-temperature heat transfer fluid is a safety hazard and may lead to fire and property damage.

Solutions and preventive measures for the faults mentioned above are described in detail in the operation instructions of the relevant SCHULTZ products.

Is caking commonly encountered in SCHULTZ heat transfer fluid?

Schultz heat transfer fluid is a synthetic aromatic hydrocarbon heat transfer fluid produced with chemical synthesis technology. With superior performance that prevents caking and solid particle generation, it features high oxidation resistance. Service experience of Schultz heat transfer fluid from around the world shows us that under good system design and correct operation, Schultz heat transfer fluids will remain free from caking.

How often does Schultz heat transfer fluid need to be replaced?

the quality of heat transfer fluids depends on time, temperature, and correct operation and design. Based on years of experience with SCHULTZ products under a variety of operating conditions, and proven by the laboratory tests, the correct replacement time for the heat transfer fluid can be determined based on the following aspects:

  1. The acid value exceeds the standard recommended value and causes a change in the quality of the heat transfer fluid.
  2. The viscosity exceeds the standard recommended value and leads to reduced low-temperature fluidity.
  3. Carbon residue exceeds the standard recommended value and leads to carbon deposition in the heat transfer fluid.
  4. Pollution has entered the system, causing deterioration of the heat transfer fluid properties.

To ensure that the heat transfer fluid is operating under optimal conditions, we recommend users periodically sample and test the on-line fluid, and analyze and determine the acid value, viscosity, and carbon residue as well as check for the presence of any polluting agents. SCHULTZ provides users with free detection facilities to enable them to timely discover any quality change of the heat transfer fluid, and to determine and plan the replacement of the heat transfer fluid in advance to avoid any unnecessary disruption to operation.

What is the difference between synthetic heat transfer fluid and mineral oil?

Synthetic heat heat transfer fluid is produced using a chemical synthesis process. The product has a certain chemical structure and composition and chemical designation. Mineral oil is derived from crude oil by fractional distillation and refining, and is a by-product generated during the production of lubricating oil. Mineral oil is composed mainly of a mixture of hydrocarbons. Compared with mineral oil, synthetic heat transfer fluid boasts features such as good heat stability, high operating temperature, resistance to coking, long service life and regenerating properties.

Is Schultz heat transfer fluid renewable?

Yes. Schultz synthetic heat transfer fluid can be recycled by filtration, distillation, hydrofining, and other methods, which contributes to the superiority of the synthetic heat transfer fluid over mineral oil. With regenerative hydrofining processing equipment, SCHULTZ can recycle used heat transfer fluid. The renewed heat transfer fluid can be blended with new oil, greatly reducing operational costs.

How can the service life of heat transfer fluid be prolonged?

The service life of heat transfer fluid depends on the type and operating temperature of the heat transfer fluid, the operating system design, and the operating conditions. Correct operation according to the manufacturer’s recommendations is the key for prolonging the service life of the heat transfer fluid.

Why should I choose Schultz heat transfer fluid?

favorable heat stability, excellent anti-cokeability, absence of corrosion, and renewability are some of the reasons for selecting Schultz heat transfer fluid. SCHULTZ can help you find the product that will fully meet your requirements. Specializing in the development, production, and distribution of high-end synthetic heat transfer fluid, SCHULTZ is one of the top three manufacturers of synthetic heat transfer fluid in the world, with its synthetic heat transfer fluid branded SCHULTZ® distributed globally. Based on international leading heat transfer fluid production technology and strong development capability, the company integrates raw material supply, heat transfer fluid production, and distribution, and is therefore free from the price control of suppliers and can completely meet the bulk demands of users at any time. Additionally, the company’s fully automated data analysis control system guarantees superior product quality, ensuring SCHULTZ® continues to be the leading brand of heat transfer fluid.

Thus, Schultz heat transfer fluid is a wise choice for you.

How to Classify Heat Transfer Fluid?

According to its chemical components, heat transfer fluid can be divided into synthetic fluid and mineral fluid. The standard classification of Heat Transfer Fluid falls into three types, which are refined mineral fluid, regular synthetic fluid and synthetic fluid with particular high thermal stability. Besides, based on fluid boiling range, it can also be divided into gas phase fluid and liquid phase fluid.

In Which Case, Should Heat Transfer Fluid Adopt the Closed System?

Based on the Boiler Safety Technology Supervision Regulation (TSG G001-2012), the following cases should adopt the closed circulation system:

  1. System with gas phase heat transfer fluid
  2. System with dangerous heat transfer fluid
  3. The maximum operation temperature is higher than fluid initial boiling point under ordinary pressure; or the vapour pressure of fluid is higher than 0.01 MPa under the highest operating temperature.
  4. System with one single fluid use over 10m3
  5. System with frequent changes of heating demand and operation temperature
What are the Functions of Fluid Thermal Stability?

Thermal stability of heat transfer fluid is the indicator to differ from other oils based on its operation and safety performance, which has great influence on fluid types and categories. The test of fluid thermal stability defines its maximum operation temperature and category.

How to Acquire the Maximum Film Temperature of Fluid?

Based on the current technology, the maximum film temperature of heat transfer fluid can’t be tested directly yet. Practical operations are according to the standard of GB 23971 Heat Transfer Fluid shown below:

For the fluid with maximum operation temperature below 320℃ (including320℃ ), the allowed maximum film temperature should be 20℃ higher than its maximum operation temperature.

For the fluid with maximum operation temperature beyond 330℃ (including330℃), the allowed maximum film temperature should be 30℃ higher than its maximum operation temperature.

Application of Heat Transfer Fluid in Oil and Gas Industry

The main application of heat transfer fluid in oil and gas industry is to heat, which includes heating the process of transportation and storage of crude oil, oil and gas processing, gas dehydration and light hydrocarbon separation.

Common Failures in Heat Transfer Fluid System

The main common failures in heat transfer fluid system are expansion tank overheating, fluid aging, coking caused by large temperature difference, no heating up of thermal equipments, and system pressure higher/lower and huge fluctuation ranges of electric current/pumping pressure.

Where to Install the Liquidometer in Fluid System

Independent direct-reading liquidometers and automatic liquid level indicators should be installed in boiler barrel, flash tank, expansion tank and condensate tank of the gas phase fluid system. A set of direct-reading liquidometer should be installed in storage tank. The liquidometer shouldn’t adopt the glass tube type.

How to Dispose the Burned Thermal Insulation Materials

Instead of being opened up immediately, the burned thermal insulation materials should be cooled sufficiently first and then be dismantled.Process the leakage points and replace the new thermal insulation materials later.

Method and Request of Exhausting in Gas Phase Fluid System

The exhausted air of gas phase fluid system (when the safety valve is on) and vacuum units should be collected in the isolated collecting tank after decreasing temperature till its liquidation. All the collected fluid shouldn’t be used again until the reprocessing has been done.

Factors Affecting Thermal Cracking of Fluid

Factors that affect heat transfer fluid thermal cracking are including fluid chemical molecular structure, purity, operation temperature and operation conditions which are temperature distribution and impurity existence.

Appropriate Valves and Pumps for Gas Phase Fluid System

It is appropriate for the gas phase heat transfer fluid system to adopt stop valves and control valves with sylphon seals. And the circulation pump should adopt shield pump and electromagnetic coupling pump which have no shaft seals.

Procedures of Fluid System Start-up and Shutdown

The procedures of starting up heat transfer fluid system are to start circulation pump first and then ignite the system. The procedures of shutting down system are to stop heating first and then stop the circulation pump after the fluid temperature is dropping below 100℃.