【JST-008】One-on-one assistance office for chemical storage and transportation engineering majors

This post was last edited by lizhenpeng on 2012-4-3 08:32. Please briefly describe the main structural features of double-deck sleeper trucks. In particular, the support structure and heating arrangement between the two layers (Moderator’s note: refer to answer on floor 3)

27m3 LNG transport tanker: This tanker can carry 27 m3 of LNG, which is equivalent to 1.6×104 m3 of natural gas. Given the low-temperature properties of media such as LNG (–160°C), vacuum fiber insulation technology is used to insulate the tank trucks. The inner cylinder and piping of the storage tank are made of 0Crl8Ni9 austenitic stainless steel, while the outer cylinder is constructed from 16MnR low-alloy steel plates. The inner and outer cylinders are supported using epoxy fiberglass, which is resistant to low temperatures and has good insulation properties. The overall equipment weight of this tank truck is 18.5 t (excluding the tractor), with a maximum allowable load weight of 34 t and a total weight when fully loaded at 30.7 t. The tractor truck chassis is a standardized North Benz NDl926S type chassis with a horizontal tank. The overall dimensions of the vehicle are 14.5 m in length, 2.5 m in width, and 3.8 m in height. Tank trucks include a liquid inlet and outlet system, an air inlet and outlet system, a self-pressurization system, a purging and displacement system, an instrument control system, an emergency shut-off valve and air control system, a safety system, an evacuation system, and a fullness measurement, analysis, and sampling system. In view of the flammability and explosiveness of LNG, the following safety measures have been adopted in the design: emergency shut-off controls, fusible plugs, flame arresters, purging and displacement systems, static electricity grounding, and fire extinguishing equipment.

This post was last edited by yuchenchf on 2012-4-4 08:39. It’s really hard to find this area! :I’d like to know the requirements regarding corrosion protection for liquid ammonia spheres. It would be great to have a construction plan as well. We use cooling tape along with water spraying; I’m not sure what the effectiveness of this approach is. Will spraying water on the white outer surface affect its appearance during use? Is it better to use cooling gel, or to use materials that meet cooling requirements? Also, if using cooling gel, it would be useful to have a construction plan; which company has better performance? (Forum moderator’s tip: Refer to answer on floor 5.)

This post was last edited by the Logistics Engineer on 2012-4-4 08:38. Hello, the following are just personal suggestions; I hope they will be helpful. 1. First, it is necessary to determine the type of liquid ammonia sphere tank. Liquid ammonia spherical tanks come in full-pressure and semi-frozen types. The total pressure is 2.2 MPa at a design temperature of 60°C (or 50°C) and a design pressure of 2.2 MPa. We generally assume that the operating pressure is 1.5 MPa, with the operating temperature being 40°C. Semi-frozen means the spherical tank is equipped with an ice maker. The design temperature is selected based on specific requirements. My unit has an operating temperature of 4°C and an operating pressure of 0.4 MPa, or an operating temperature of 20°C and an operating pressure of 0.8 MPa. 2. Understanding the function of cooling gel: As far as I know, cooling gel is primarily used to block infrared radiation. It can reduce the temperature inside the tank by about 10°C compared to the temperature outside the tank. In other words, when the outside temperature is 40°C, the inside temperature is around 30°C. The suggestions are easy to see from the above two points. Semi-frozen spherical tanks require insulation, and they are not very suitable for cool gel. Full-pressure storage tanks can use cooling gel, or they can also be insulated. The cool gel does indeed affect its appearance after being wet. I use cooling gel mostly on nail B materials, and it has also been used in full-pressure spherical tanks. I just found an attachment for you; I hope it’s useful

It would be good to have a set of reference images. Especially the drawings with welding markings.

LZ, can you use HYSYS to simulate this component of mine? There are components inside this

This post was last edited by lizhenpeng on 2012-5-4 08:24. So, how can we determine whether the Lianliang glue meets the required standards after it has been produced? How is it detected? Additionally, in some cases, cooling gel is applied only above the pillars and tie rods of the liquid ammonia spheres, while fire-resistant coating is used below; in other cases, cooling gel is applied to both the pillars and tie rods (both are white, giving a better appearance). So which option is better? If the spherical tank is to be used as a cooling gel container, what kind of topcoat should be applied to the attached handrails and ladders? (Publisher’s note: Refer to answer on floor 9 for reference)

This post was last edited by the Logistics Engineer on 2012-4-8 at 21:31. So, how can we determine whether the Lianliang glue meets the required standards after it has been produced? How is it detected? Please consult the relevant manufacturers and construction firms; I am not very familiar with this. For some liquid ammonia spherical tanks, cooling gel is applied only above the pillars and tie rods, while fire-resistant coating is used below; in other cases, cooling gel is applied to both the pillars and tie rods (it’s white, which gives a better appearance). So which option is better? There is no doubt that a fire-resistant coating is required on the lower part; please refer to the design fire protection codes for petrochemical enterprises. Also, when using cool gel in spherical tanks, what type of topcoat is suitable for the accompanying handrails and ladders? There is no need to meet the requirements.

This post was last edited by lizhenpeng on 2012-5-4 08:24. Our facility’s styrene storage tank is about to undergo a water test run; temperature control is achieved through insulation coatings and a cooler that uses 5-degree ethylene glycol coolant to keep the styrene temperature around 10 degrees. The cooling inside the storage tank is achieved through circulation by the loading pump, and the same principle applies to the pipeline used for transferring material. I wasn’t involved in process engineering before, and now I’m tasked with preparing a commissioning plan; I would be very grateful if experienced colleagues could offer me some guidance. Cooling test procedure for the storage tank: 1. Cooling of the styrene pipeline: When the temperature of the material in the styrene pipeline exceeds 20 degrees, circulation cooling is necessary to prevent the styrene from polymerizing. 2. The cooling operation of styrene in the pipeline is carried out according to the following steps: (1) Verify that the flow is unobstructed and that all valves that need to be closed are properly shut; see the diagram for details. (2) Start the loading pump, and pay attention to any signs of pressure buildup or leaks. (3) The indoor operators should pay attention to whether the liquid level in the storage tank is stable. (4) Slowly open the inlet valve for cooling water; indoors, monitor the temperature changes of styrene in the pipelines, maintain communication with the outdoor team, and keep the outlet temperature of styrene from the heat exchanger at around 10 degrees. (5) People inside should keep temperature records. 3. Precautions: (1) Operate the valves smoothly to prevent impacts of the fluid flow within the pipelines (Moderator’s note: Refer to answer from floor 11)

I took a quick look at what you wrote; it’s quite good. I offer the following suggestions for your reference. 1. As a driving operation manual. It should be specified for each pipeline and valve; it is recommended to include the pipeline number and the pump tag number. 2. The hydraulic testing of the storage tank is complete, pipeline purging is finished, and nitrogen replacement has been successful. 3. The pump has passed individual tests and is now in standby mode. 4. The refrigeration pipeline is in standby mode. 5. The interior of the storage tank is being cooled down. 6. Be careful to control the initial feeding speed. 7. Add more content regarding safety aspects (such as preventive and monitoring measures for overpressure in storage tanks, fires, etc.). 8. Personal protection aspects (what issues drivers should be aware of). The content you have written needs to be more detailed.