One. Overview
The propylene oxide crane pipe is a crane pipe used for propylene loading and unloading operations. Propylene is a colorless, slightly sweet gas at room temperature. It is a flammable medium and requires special loading crane tubes for loading and unloading operations. The molecular weight is 42.08, the liquid density is 0.5139g / cm3 (20/4 ° C), the gas density is 1.905 (0 ° C, 101325Pa.abs), the freezing point is -185.3 ° C, and the boiling point is -47.4 ° C. It is slightly narcotic and completely decomposes at 815 ° C and 101.325kpa. Flammable, explosion limit is 2% to 11%. It is insoluble in water and soluble in organic solvents. It is a low-toxic substance. Propylene is the basic raw material of three major synthetic materials. It is mainly used to produce polypropylene, acrylonitrile, isopropanol, acetone, and propylene oxide. Usually the crane pipe model is AL2543, the letter AL stands for land liquid loading and unloading arm, the first digit 2 represents the bottom loading and unloading, the second digit 5 represents the number of rotary joints of the liquid phase pipe is 5, and the third digit 4 represents the gas phase pipe form. For the downturn type, the fourth digit 3 indicates that the liquid phase tube is upturned type.
Parameters
Design pressure: 2.5MPa; Test pressure: 3.75MPa
Design temperature: -40 ℃ ～ + 60 ℃
Conveying medium: acrylic
Takeover flange standard: HG20594-97
Nominal size: liquid phase: PN2.5 DN50; gas phase: PN2.5 DN25
Pick-up form: quick connector
Three. The main structure
Column: Supports and supports the turning moment when the arm is deployed
Rotary joint: It is composed of rotating parts and seals. It is mainly used to connect different components of the liquid loading arm for relative rotation and can bear the load.
Inner arm: used to connect the conveying pipe and connect with the outer arm
Outer arm: It can rotate in the range of horizontal and vertical planes. It is mainly used for loading and unloading parts that adjust the working position with the tank car and tank ship
Balancer: A component used to balance the torque of the outer arm
Quick Couplings: Manual or hydraulically driven components that can be quickly connected to the tanker or tanker interface
Ball valve: manual control loading and unloading switch
Pull-off valve (optional): emergency release valve for connecting to the car tank interface
4. The main material
Pipe flanges and fittings: 304; ball valves: 304; quick connectors: 304
Rotary joint: outer ring 30CrMo or 45 steel, inner ring 304, flange 304
Main sealing ring: PTFE, skeleton 304
