Liquid CO2 Storage Tank
Operation and Maintenance Manual
Contents
I.Structure Description
II.Operation and Maintenance
1.Operation
2.Maintenance
III.Transportation and Installation
1.Transportation
2.茶树菇怎么种植Installation
IV.Safety Requirements and Precautions双倍用英语怎么说
1.Safety Requirements
2.Precautions
I.Structure Description
1.Main Structure
The tank is of double-wall structure. Its inner vesl炒大虾的做法 is made of alloy steel 16MnDR and pipings are made of austenitic stainless steel and its outer vesl is made of carbon steel Q235-B.The jacket between the two微信营销技巧 vesls is filled with perlite and evacuated. A specially treated adsorbent is placed in the jacket to prolong the vacuum life of the tank.
The tank is equipped with necessary valves around its bottom for operating it.
2. Peculiarities
(1)Compact structure and less occupied space;
(2)The tank is equipped with the liquid filling connector for filling the liquid to the liquid vaporizers and tankers;惶恐不安的意思
(3)The perlite (thermal insulation material) and adsorbent in the jacket have been specially treated so as to prolong the vacuum life. Moreover, the tank is equipped with a metallic thermocouple gauge tube for measuring the vacuum in the jacket when necessary.
II.Operation and Maintenance手机类型
1.Operation
(1) Preparation
Before being put into u, the tank must be subjected to a gas-tight test, a purging and a check of valves and instruments.
① Gas-tight Test
The tank must be subjected to a gas-tight test before the CO2 liquid is filled after the tank is installed or the temperature of the inner vesl returns to the normal temperature. The test pressure should be the MAWP (maximum allowable working pressure) of the tank and the testing gas should be oil-free and dry air or dry nitrogen. The testing time must be four hours or more.
② Purging
After the gas-tight test is accepted, the inner vesl system of the tank must be purged with oil-free and dry air or nitrogen to remove any moisture. After purging with the dry air or nitrogen, the whole system must be further purged with the product gas until the discharged purging gas reaches the required purity.
③ Checking for Valves and Instruments
Make sure that all the valves are in correct opening or closing state and that all the instruments are in correct indication, otherwi they must be adjusted properly before the cryogenic liquid is filled.
(2) Liquid Filling
The liquid filling is divided into first filling and make-up filling.
1First Filling (i.e. the filling when the inner vesl is at the normal temperature)
The filling steps are as per follows:
a)Connect the liquid filling pipeline.
b)Purge the liquid filling pipeline (this step must be done before each filling). Before the liquid inlet valve is opened, the liquid transferring pipe must be filled with a small quantity of liquid 关于快乐的名言名句via the liquid discharging valve and at the same time the residual liquid draining valve must be opened to purge the pipeline for eliminating the moist air and mechanical impurities from it.
c) Fill gas CO2(pressure≥1.2MPa,temperature≥15℃) from gas-through valve to the inner vesl until the pressure of the inner vesl＞1.2MPa.扬刺
d) Open the lower filling valve to fill the liquid from the bottom,
the valve must be slightly opened in order to cool the pipeline and inner vesl gradually to the temperature of the filled liquid. When the liquid level gauge begins indicating liquid level, the filling valve may be further opened to increa the speed of filling.
e)When some liquid is sprayed from the fullness test valve which is already opened, it means that the tank has been fully filled with liquid and then the lower filling valve should be immediately clod to stop the filling. At the same time the residual liquid draining valve should be opened to drain off any residual liquid from the liquid filling pipeline. During filling, if necessary, venting valve can be opened; Pressure of the inner vesl must be higher than 1.2MPa no matter at any condition or at any time.
g) Disconnect the liquid filling pipeline upon completion of the liquid filling.
② Make-up Filling (i.e. the filling when the inner vesl is at the
temperature of the CO2 liquid)
The steps for the make-up filling are almost the same as tho for the First Filling. The only difference is that some CO2 liquid already exists in the inner vesl and that it is unnecessary to cool the inner vesl. Therefore the liquid may be filled directly from the lower filling valve after the pipeline is purged.
