First, how much is the distance between liquid ammonia pipe and storage tank
1. Setting principle of liquid ammonia crane pipe and storage tank spacing
In the process of liquid ammonia storage and production, in order to ensure production safety, the setting distance between liquid ammonia pipe and storage tank is very important. In general, the setting of liquid ammonia pipe and tank spacing should be considered according to the following principles:
(1) The relevant national safety regulations and standards should be the primary reference basis, such as the "liquid ammonia pressure vessel safety Technical Supervision Regulations".
(2) Factors such as production process and safety facilities should be considered to fully ensure production safety.
(3) Under the premise of ensuring production safety, it is necessary to save space as much as possible and improve production efficiency.
2. Setting factors of distance between liquid ammonia pipe and storage tank
The setting of liquid ammonia pipe and tank spacing should be determined according to the specific situation, and generally should be considered according to the following factors:
(1) The volume size of the storage tank, in general, the larger the volume of the storage tank, the spacing between the liquid ammonia pipe and the storage tank should be increased accordingly.
(2) The density of the storage tank, the different density of the storage tank on the liquid ammonia pipe and tank spacing requirements are also different.
(3) The length of the crane tube, the longer the length of the crane tube, the distance between the crane tube and the storage tank should be increased.
(4) The perfection of production safety facilities, such as explosion-proof devices, pressure gauges and other safety facilities will also have an impact on the requirements of liquid ammonia pipe and storage tank spacing.
3. Set the distance between liquid ammonia pipe and storage tank
According to relevant standards and regulations, the general setting of liquid ammonia pipe and tank spacing is as follows:
(1) For vertical storage tanks, the general distance shall not be less than 1/2 of the circumference of the storage tank, and the distance shall not be less than 5 meters.
(2) For horizontal storage tanks, the general distance shall not be less than 1/2 of the length of the storage tank, and the distance shall not be less than 5 meters.
It should be noted that the specific setting of liquid ammonia pipe and tank spacing should be based on the relevant national safety regulations and standards, and should fully consider the production process and safety facilities and other factors to ensure production safety.
Two, liquid ammonia crane pipe and liquid ammonia quantitative loading operation procedures
1. The crane tube gas and liquid phase arms for loading and unloading liquid ammonia are connected to the gas and liquid phase interfaces of the tank truck respectively (place gaskets), and tighten the bolts symmetrically.
2. If there is no pressure in the crane tube, the valve connecting the crane tube gas and liquid phase with the unloading pipeline can be opened, and the valve on the unloading pipeline can be closed after pressurizing the crane tube.
3. Slowly and slightly open the ball valve for the interface leakage test, and close the valve after confirming that the air tightness is intact.
4. Verify that there is enough oil in the hydraulic pump of the train tank car, close the reflux handle (rotate clockwise), open the stop valve on the oil circuit, push the hydraulic pump injection handle repeatedly, and gradually increase the pressure of the pipeline. When the pressure increases to about 3MPa, the working oil tank of the emergency cut valve will work, and the pilot valve flap in the emergency cut valve will open, and a slight sound will come out of the valve about half a minute later. The main valve disc is automatically opened.
5, micro-opening tank truck discharge gas, liquid phase ball valve, secondary test of the air tightness of the interface.
6. If the pressure inside the tank truck is higher than the gas and ammonia main pipe pressure PT102, open the upper ball valve of the gas phase crane pipe and the upper ball valve of the gas phase ammonia discharge pipe to relieve the gas and ammonia pressure inside the tank truck. When the pressure inside the tank car is the same as PT102, close the upper ball valve of the gas phase crane pipe and the gas phase ammonia discharge pipe. At this time, the pressure of PT101 is higher than the pressure of PT102, open the upper ball valve of the liquid phase crane pipe and the upper ball valve of the liquid phase ammonia loading pipe, and start to load ammonia.
7. If the pressure inside the tank truck is equal to PT101 pressure, close the upper ball valve of the liquid phase ammonia loading pipe and the upper ball valve of the liquid phase ammonia unloading pipe, open the upper ball valve of the gas phase ammonia unloading pipe, and let the gas ammonia in the tank truck relieve pressure again. When the pressure inside the tank car is stable and equal to the pressure of the gas-ammonia main PT102, close the upper ball valve of the gas-phase crane pipe and the upper ball valve of the gas-phase ammonia discharge pipe, and then open the upper ball valve of the liquid-phase ammonia loading pipeline and the upper ball valve of the liquid-phase crane pipe to install the liquid ammonia crane pipe.