What insurance does a hot oil or frac water heating company need for operator work?

Hot oil units circulate heated oil or water down a well or through flowlines and tanks to clear paraffin. Frac water heaters bring large volumes of water up to temperature for completions. Other units heat fluids for tank cleaning, pipeline work and winter operations. All of them put a burner, pressurized hot fluid and hydrocarbons in the same place.

That combination is why hot oil is rated and underwritten more like a fire exposure than general oilfield labor. OSHA's oil and gas hazard guidance notes that flammable gases and vapors can be released from wells, trucks, tanks and surface equipment, and lists open flames and hot surfaces among ignition sources. A burner is both.

From an insurance standpoint, that affects:

• Which GL markets will write the class, and what conditions or exclusions come with it.
• Whether the umbrella underwriter will sit over the GL at the limit the MSA asks for.
• How burn injuries to your own crew interact with the knock-for-knock indemnity and your workers comp.

The serious claims in this trade usually involve fire. A flash fire at a tank during a hot oil job, a line rupture that sprays hot fluid, or ignition of vapors near the heater. Three groups can be hurt: your crew, the operator's people or other contractors on location, and the operator's equipment.

Under a typical knock-for-knock MSA:

• Injuries to your crew are your responsibility, through workers comp and employers liability, and through your indemnity to the operator if one of them sues the operator.
• Injuries to the operator's people and other contractors are the operator's responsibility (or the other contractor's), regardless of fault, if the MSA is truly reciprocal.
• Third parties outside the knock-for-knock group go to whoever was at fault, which is where your GL and umbrella respond.

OSHA treats flash fire as a recognized hazard in well servicing and production-related operations. Its flame-resistant clothing enforcement policy cites the general industry PPE standard and notes that FRC can significantly reduce the extent and severity of burn injuries. Operators and prequalification platforms ask about it in safety audits, and underwriters ask about it too.

This is the most common coverage gap we see for hot oil companies, and it rarely shows up until a claim.

A hot oil unit mounted on a truck chassis is a vehicle on the road and a heater on location. A skid-mounted frac heater on a trailer is equipment that gets towed. The commercial auto policy, the GL policy and the inland marine or equipment policy each have their own definitions of auto, mobile equipment and covered property, and those definitions do not always line up the way an owner expects.

What to check:

• Physical damage to the unit. Is the heater scheduled on the auto policy for physical damage, on an equipment floater, or both? If the heater burns on location, which policy pays for the unit?
• Liability while operating on location. If the heater is treated as an auto, liability while it is operating may sit on the auto policy, not the GL. Make sure the auto policy is endorsed to the MSA (additional insured, waiver, primary) the same way the GL is.
• The burner and boiler. Some equipment policies exclude mechanical breakdown or damage from the unit's own heating process. Ask how a burner failure is treated.

The oilfield equipment insurance page covers how inland marine and equipment floaters are usually structured for oilfield contractors.

Frac water heating and hot oiling are done on someone else's property: the operator's tanks, flowlines, wellhead and frac water. If a tank ruptures from overheating or a line is damaged, the question is whether your GL covers damage to the property you were working on.

Standard GL forms exclude damage to property in your care, custody or control and to the particular part of real property you are working on when the damage arises out of your work. How much of the operator's equipment falls inside those exclusions depends on the policy wording and the facts.

Most MSAs handle this through the knock-for-knock allocation: the operator takes responsibility for its own property and waives recovery against you. That works only if the MSA actually says it and the operator's waiver reaches the equipment you were working on. Read the property clause, not just the injury clause.

A hot oil job can put heated crude, paraffin-laden fluid or produced water on the ground through a ruptured hose, an overfilled tank or a backflow. That is a pollution event as well as a liability event.

Under Chapter 127 §127.004, the Texas Oilfield Anti-Indemnity Act does not apply to property injury that results from pollution, including cleanup and control of the pollutant. So a clause that makes you responsible for pollution originating from your equipment is judged under general Texas contract law, not the Act.

Line up three things:

• What the MSA assigns to you. Often, pollution originating above the surface from your equipment.
• What your GL gives back. Total pollution exclusion, or a sudden and accidental buyback with discovery and reporting windows.
• Whether you need contractors pollution liability. If the MSA asks for "pollution liability" with its own limit, a GL buyback usually does not satisfy it.

See oilfield pollution liability for how these layers fit together.

Hot oiling a well is a well service under Chapter 127. The definition in §127.001 includes treating, conditioning and otherwise rendering services in connection with a well, and agreements for furnishing or renting equipment and incidental transportation.

The rules that follow:

• §127.003 voids indemnity for the operator's sole or concurrent negligence for injury, death and property injury.
• §127.005 lets that indemnity stand if the parties agree in writing that it will be supported by liability insurance. For mutual indemnity, the obligation is limited to the coverage and dollar limits each party agreed to obtain for the other; for unilateral indemnity, required insurance may not exceed $500,000.
• §127.004 takes pollution property damage, reservoir and underground damage and wild well control outside the Act.

For a hot oil company, the practical point is that the insurance exhibit sets the size of the indemnity you are giving for burn injuries to your own crew. See does Chapter 127 require mutual insurance.

When the certificate is compared to the MSA, hot oil and fluid heating companies run into the same endorsement problems as other contractors, plus a few tied to the class. See why was my certificate of insurance rejected.

Send the MSA insurance and indemnity sections, the operator's ISN or Avetta requirements, and a short list of your units (truck-mounted or skid, and roughly how many). If you have it, include the schedule of vehicles on your auto policy and the equipment schedule on your inland marine. Comparing those two lists is usually where the heater gap shows up.

We read it against the MSA and tell you where the heater units sit, whether the umbrella reaches the required limit for your class, and what Chapter 127 means for your burn injury exposure. Regional notes are on the Permian Basin page.