Regarding the test pressure for the tank body of road tankers

Automotive standards should have been reformed long ago; many of the current requirements are no longer necessary. The test pressure specified in current JB/T 4783 is consistent with GB 150. We have always conducted pressure tests on tank trucks in accordance with the regulations specified in GB 150, and the inspection authorities have had no objections.

There is no contradiction here; according to Article 10, Paragraph 2 of the 1994 version of the Vehicle Standards: “The tank shall be of welded steel construction, and its structural design shall comply with the relevant provisions of GB150.” ”And, Article 31, Paragraph 5: “The hydrostatic test pressure shall be 1.5 times the design pressure.” ” My understanding is as follows: 1. For the structural design of the tank, aspects such as the thickness, dimensions, type of the cylinder and head, as well as the type of welding joints, should comply with the requirements of GB150; however, pressure testing is not included among these requirements ； In fact, the voltage withstand test should fall under manufacturing rather than design. 2. Since the automotive standards specify clear requirements for the hydraulic test pressure of tanks, these requirements should be followed. After all, GB150 is a general standard, while the automotive standards are specialized specifications that are more suitable for tank trucks! 3. As users or purchasers of tank trucks, we first consider whether they meet the vehicle standards at the time of purchase and inspection, just as we refer to the container standards when inspecting containers ； This is because meeting the automotive industry standards is a prerequisite for obtaining a usage permit from the authorities responsible for supervising special equipment. Personal opinion, for reference only!

Road tankers are typical mobile pressure vessels. In China, the regulations governing mobile pressure vessels include the \"Regulations on Pressure Vessels\", the \"Regulations on Automotive Equipment\", and standard GB/T19905. Standards GB150 do not apply to mobile pressure vessels. At present, since the \"Regulations on Safety Inspection of Mobile Pressure Vessels\" have not yet been issued, the design and manufacture of road tankers should comply with the \"Regulations on Pressure Vessels\", the \"Regulations on Automotive Equipment\", and GB/T19905. In the event of any conflicts between regulations and standards, the stricter requirements shall prevail! !

GB/T 19905-2005 specifies that the test pressure for liquefied gas transport vehicles is 1.3 times the design pressure. While automotive standards require 1.5 times. It is specified in the design drawings that the design standard is GB/T 19905-2005; is it a problem if the test pressure specified in the drawings and calculation documents is set at 1.3 times the design pressure?

Theoretically, there is no problem, but the Regulatory Guidelines are legal regulations that serve as the basis for registration and inspection by boiler inspection agencies in various regions. Therefore, to avoid unnecessary complications, it is best to follow the provisions of these Regulatory Guidelines; everything will be standardized once the Mobile Regulatory Guidelines are issued! !

Reply to the original poster: In the design of pressure vessels, the most important reference standard is GB-150, which specifies that the hydraulic testing for pressure vessels should typically be conducted at 1.25 to 1.5 times the design pressure. Normally, 1.25 times is the choice. Actually, the hydraulic test of the tank truck cylinder you mentioned is still within this range, so there’s no contradiction. Many of the current industry standards for pressure vessels are formulated with reference to GB-150, and the formulation of GB-150 itself is based on previous industry standards, including some that have been abolished. So currently, various standards are being revised version by version; once these standards are unified in the future, this phenomenon will no longer exist. If such a conflicting situation does arise, let’s discuss it further; in my opinion, I support applying stricter standards.

Hey, guy on the 8th floor: In GB150, for the hydraulic testing of pressure vessels, is it usually the design pressure multiplied by 1.25 to 1.5? From what I understand, it should be design pressure times 1.25 times the allowable stress at the design temperature divided by the allowable stress at the hydraulic testing temperature. But in our company, the testing pressure for tank vehicles is set at 1.5 times the design pressure.

Hey, guy on the 8th floor: In GB150, for the hydraulic testing of pressure vessels, is it usually the design pressure multiplied by 1.25 to 1.5? From what I understand, it should be design pressure times 1.25 times the allowable stress at the design temperature divided by the allowable stress at the hydraulic testing temperature. But in our company, the testing pressure for tank vehicles is set at 1.5 times the design pressure.

Our company has always carried out pressure tests on tank trucks in accordance with the regulations specified in GB 150; the pneumatic test pressure is equal to 1.15 * design pressure

It seems that the supervision of tank trucks is not strict enough; a test pressure of 1.25 to 1.5 times is acceptable

It should be done in accordance with the requirements of JB/T4783; however, attention should be paid to the difference between the design pressure and that specified in GB150

GB150 is applicable to fixed containers; the test pressure for tank trucks cannot be determined using GB150. Additionally, JB/T 4783 is applicable to vehicles used for transporting low-temperature liquids, and the test pressure for tank trucks at normal temperatures cannot be determined in accordance with the requirements specified in JB/T 4783

In accordance with JB/T 4783, GB150 is no longer listed as a standard to be referenced in vehicle design drawings these days, especially when it comes to pressure and hydraulic test pressures