Question: Hi, I haul gas for a major trucking company in Michigan. We have several 6-axle trailers with compartment sizes 4000/2000/1400/2000/4000 and 4700/1150/1750/2900/2900. It seems when I ask what the lift axle pressure should be set at; everyone gives me an unsure answer, like they’re guessing. Can you provide the correct psi for the front / rear lifts. Also, when we do split loads does the front lift axle have to be used if say, comp 1 2 3 are only used? Thank you. Ryan
Answer: To ensure proper weight distribution and axle load limits, lift axle ride bag pressures should be set by placing the loaded trailer on a scale and dialing in the ride bag pressure to the legal axle weight limit. The loaded trailer will need to be scaled axle by axle to arrive at an accurate per axle trailer weight. Using a calibrated scale the user can correlate the ride back pressure to the gauge pressure. It is incumbent upon the user to ensure he/she is in compliance with all state and federal regulations.
Question: I am new to the tanker field and would like to know the pros and cons of using 406 versus and 407 tankers. We are setting up to haul non blended Bio-Diesel (B99). Will both work and if so which is preferred and why?
Answer: Thanks for your question. You will want a 407 tanker with insulation and possibly in transit heating capability depending on the length of your haul and outside air temperature. This is to prevent the Bio-Diesel from solidifying
Question: I have a bulk liquid trailer that is stamped Capacity 5400 FPU. Can you tell me what the gallon capacity for this would be? Thanks Henry
Answer: Sure, this was a milk tank (usually stainless steel). The 5400 was for 5,400 gallons (probably a two compartment trailer), and the FPU stands for “farm pick up”. These tanks were / are used to collect the milk at the farms and take it to the dairy for processing. They also usually have a two or a three section stainless steel cabinet at the rear of the trailer that houses the valves and piping, the stainless steel sanitary pump and motor, and a “sample chest”.
Question: Would it be feasible and/or economical to convert a DOT 407 trailer to DOT 412 for hauling hydrochloric acid? Dirk
Answer: Thanks for the question Dirk! No, you cannot turn a 407 into a 412 certification. A 412 trailer has to be built to that certification; it must be built to ASME code and carry a U-Stamp on the plate. Unlike the 407, all material that goes into the 412 vessel must have papers certifying it meets the proper specifications. The trailer must also be rubber lined to handle hydrochloric acid. Even though some of these trailers are aluminum, the majority of them are made of steel.
Question: Does DOT allow the use of MC306/DOT406 tank trailers for transporting crude oil, and where can I find the proper requirements for crude hauling? Thanks! Ken
Answer: Yes, you can haul crude oil in 306-406 tanks as long as the vapor pressure does not exceed the design pressure of the trailer. Most crude trailers being built today in the U.S. and Canada are 407 Spec. Basically the same as other petroleum tankers, the requirements for a tanker hauling crude is based on flash point and vapor pressure. Some crude can be hauled in non DOT tanks but is usually not done due to the versatility needed to haul all crude product, ranging from heavy crude all the way to condensate. This is the reason why DOT 407 is usually used for crude.
Question: I heard that mild steel tanks are not allowed to carry gasoline for safety reasons. Instead, in order to carry gasoline, only aluminum tanks should be used. Is that true? Is there any standard that I can refer to? Marziyana
Answer: Gasoline is delivered globally in steel trailers. India, Latin America, Brazil and others are exclusive. It is compatible. Local laws might suggest different for you. The U.S. and the rest of North America (and Europe) shifted primarily for reasons of weight (among others).
Question: Our company has a Heil Trailer crude oil tanker hauling only “sweet” product, but we are entering a new service area. Should we be concerned about corrosion caused by hauling crude oil with a small amount of H2S (under 150 ppm) in an unlined tank? Eric
Answer: We strongly recommend lining any tank hauling crude, even sweet. If they acidize frac the well, you will get some acid when you pull loads of crude afterward. It will lie on the bottom of the tank and can start pitting rapidly. We have seen this happen on several occasions. H2S mixed with water can start a problem quickly.
Question: Hello, I am working in a company that require trailers for liquid sulfur (T=140°C) of 30 tons capacity. Can Heil Trailer supply this requirement? Best Regard – Ana
Answer: We build some sulfur trailers out of aluminum. We would need specs and other information. Please feel free to contact our Heil Trailer, Texas, facility for more information (817.430.1472 ).