SY/T 0083-1994 Oil removal tank design specificationSY/T0083-1994 standard download decompression password: www.bzxz.net

Standard of the People's Republic of China for the Design of Oil Removal Tanks SY/ T 0083-94 Edited by: Survey and Design Institute of Dagang Petroleum Administration Bureau Approved by: Petroleum Industry Press of China National Petroleum Corporation Beijing 1994 General Provisions Water distribution and collection, Sedimentation separation Inclined tube (plate) separation Flotation separation Oil collection and oil discharge Mud discharge and overflow Explanation of terms used in this specification Appendix A Additional explanation Design of Oil Removal Tanks (11) (14) Explanation of clauses ·.·.·.·..*·.··*· (15) Document of China National Petroleum Corporation
(94) CNPC Technical Supervision No. 711
Notice on the approval and release of ten oil and gas industry standards including "Oilfield Surface Construction Planning and Design Specifications" To all relevant units:
"Oilfield Surface Construction Planning and Design Specifications" and other · item standards (draft) have been reviewed and approved and are now approved as oil and gas industry standards and are hereby released. Numbers of various standards: The names are as follows:
SY 0049-94
SY/ T 0083-94
SY/T 008494
SY7T 0085-
SY /T 053494
SY/T 0535-94
SYT 0541-94
SYT 0542-94
SY7T 0543--94
SYT 750494
Oilfield surface construction planning and design specifications
Deoiling tank design specifications
Test method for annular bending performance of pipeline anticorrosion coating Test method for natural climate exposure of pipeline anticorrosion coating Test method for gas-liquid volume of separator Near-situ sampling and collection method
Calculation method for thermal and resistance of fire-type heating furnace Determination of crude oil condensation point
Analysis of stable light hydrocarbon components by gas chromatography
Sampling method for stable light hydrocarbons
Analysis of n-octane-containing hydrocarbon components in crude oil by gas chromatography (replacement of SY7504-85)
The above standards shall come into effect on June 1999. China National Petroleum Corporation
October 31, 1999
1.01 This specification is formulated to unify the design standards and technical requirements of dehumidification tanks for oilfield oily wastewater treatment projects, so that the design can be technologically advanced, economically reasonable, safe and reliable, and ensure quality.
1.02 This specification is applicable to the design of vertical oil removal tanks for new construction and expansion of oily wastewater treatment projects on land. The design of vertical oil removal chains and pressure oil removal tanks can be implemented as a reference.
1.0.3 The design of oil removal tanks should be based on the continuous summary of production experience and scientific experiments, combined with the actual situation of oil fields, and actively and prudently adopt new technologies at home and abroad to gradually improve the design level.
1.0.4 In addition to complying with this specification, the design of oil removal tanks should also comply with the provisions of relevant current national and industry standards and specifications.
2.0.1 Oil removal tanks
2 Terms
Circular and horizontal steel oil removal equipment for removing small crude oil from wastewater. 2.0.2 Vertical atmospheric pressure oil removal tanks
Circular vertical dome steel oil removal tanks used in atmospheric pressure treatment processes in oily wastewater treatment. Referred to as vertical oil removal tanks.
2.0.3 Horizontal pressure oil removal tank
The circular horizontal steel oil removal tank used for the pressure treatment process in the treatment of oily wastewater is referred to as the pressure oil removal tank.
2.0.4 Sealed oil removal tank
The oil removal tank with sealed oxygen isolation measures for natural gas or ammonia on the top of the tank 2.0.5 Coagulation
Under the action of the coagulation material, the fine oil droplets in the oily wastewater gather into coarse oil droplets, thereby accelerating the buoyancy and achieving the process of oil-water separation. 2.0.6 Coagulation
"Coagulation" is the whole process after adding coagulants to the raw water until the final flocs are formed. "Coagulation" is usually divided into two stages: "coagulation" and "flocculation". The coagulation stage includes destabilizing the colloid and aggregating the colloid particles into micro-flocs under the action of Brownian transport; and the process of further increasing the micro-flocs by consuming the energy of liquid flow and the adsorption and bridging effect of flocculants between suspended solids is called flocculation. 2.0.7 Sedimentation
The separation process of crude oil and floating solids in sewage under the action of gravity is called "sedimentation".
3 General provisions
3.0.1 Selection of oil removal tank type: The treatment process and the quality of oily sewage are determined according to the determined treatment process, the nature of the oil in the sewage, the treatment scale, and the water quality requirements after treatment, and are determined through technical and economic comparison.
3.0.2 The oil content of edible oil sewage entering the oil removal tank shall not be greater than 1000mg/L, and the content of sand particles with a particle size greater than 76um shall not be less than 1000mg/L. It must be greater than 100111g/L. Otherwise, a removal device must be installed before entering the oil removal tank.
After oil removal treatment, the oil content in the sewage should not be greater than 50m/L, and the suspended solid content should not be greater than 20g/L
3.0.3 The diameter of the vertical oil removal tank should be selected according to the standard dome steel tank. 3.04 The design temperature of the oil removal tank should be determined according to the maximum temperature of the oily sewage, and generally should not exceed 80. Process calculation time: The temperature is selected according to the actual temperature of the oily sewage. 3.0.5 The vertical oil removal tank should adopt a closed oxygen isolation device. When the total mineralization degree of the sewage is greater than 5000mg/L, natural gas or nitrogen should be used as the closed medium. When the total mineralization degree of the sewage is less than or equal to 5000mg/L, a deoxidizer can be added if necessary to make the load in the purified water meet the standards of the user enterprise or the industry concerned about water quality. Sun Zhun: .06 The lightning protection, grounding and fire protection of the de-oiling tank should comply with the current US safety regulations and provisions.
3.0.7 The inner and outer walls and internal metal components of the de-oiling tank should take corresponding anti-corrosion measures according to different situations. The bottom of the vertical normal pressure de-oiling tank should be protected by a bundled anode or an external current method.
30.8 The de-oiling tank is generally not required to be insulated. In high-cold areas and high-freezing crude oil mountains: it should be determined according to the actual situation.
3.09 An oil collection tank is installed in the oil collection area of ​​the vertical de-oiling tank. The horizontal deviation value of the oil collection tank is 5mm. The maximum oil accumulation height should not be greater than 1.0m. Whether a heating plate is installed in the collection tank for heat storage should be determined based on the water temperature of the oily sewage and the freezing point of the crude oil. 3
The design elevation of the top surface of the vertical de-oiling tank foundation should not be higher than the design elevation of the outdoor ground. Should be less than 0.3m.
The protective height of the vertical oil removal tank liquid level should not be less than 0.5. The oil removal tank should be equipped with the following lip facilities.
The oil removal tank is equipped with ladders, platforms, railings, manholes, cleaning holes, light holes, vents, and material holes.
If the oil removal tank is equipped with a coalescence and inclined pipe (plate) section, a mechanical breathing valve and a gas replacement valve should be installed at the outlet and outlet of the closed oil removal tank. No vent pipe is provided.
3.0.12.4 The inlet and outlet pipes should be equipped with sampling ports and thermometers. 4 The head loss of the inlet, distribution, collection and outlet of the oil removal tank can be calculated according to the water supply hydraulic calculation formula, and a margin of 10%-20% should be added.
4.0.2 When the diameter of the inlet and outlet pipes of the oil removal tank is DN200, the flow rate should be 0.8~1.2m/s; when DN→200, the flow rate should be 1.01.6m／s. 4.0.3 For vertical oil removal tanks, it is advisable to use the water distribution method of the radiant pipe system bell mouth or the central tube opening water distribution
The bell mouth should be arranged evenly in the cross section of the oil removal tank: the bell mouth is downward and a baffle is set. The parameters should meet the following requirements:
The flow rate of the distribution pipe should be 0.4~0.6ms
The control area of ​​each bell mouth should be 2.5~7.5mThe diameter of the bell mouth should be 15~2.0 times the diameter of the distribution pipe. 4.0.4 The water collection of the vertical normal pressure oil removal tank can choose the radiant pipe system bell mouth or umbrella cover.
4.0.4.1 The bell mouth is evenly arranged along the cross section of the oil removal tank, with the bell mouth facing downward. The parameters should meet the following requirements:
The flow rate of the water collection pipe should be 0.4~0.6m/s;
The control area of ​​each bell mouth is 2.5~～7.51m2 The diameter of the bell mouth is 1.5→2.0 times the diameter of the water collection pipe. 4.0.4.2 The umbrella-shaped water collection is suitable for oil removal tanks with a central tube. The umbrella diameter should be 15 times the diameter of the central and small cylinders. The water collection control water inlet hole is determined by the principle of uniform and water collection: the water collection cavity should be equipped with an exhaust pipe (hole)
4.0.5 The vertical oil removal tank can be equipped with a horizontal pipe, a fixed weir or an adjustable weir to control the liquid level. The installation height is determined by calculation according to the head loss of the water outlet system: the thickness of the accumulated oil, the difference in oil-water density and the weir head.
4.0.6 All pipelines in the closed oil removal tank that are in contact with the atmosphere should be equipped with water seal facilities, and the water seal height should not be less than 250mm. When the outlet weir box is used, the outlet pipe water seal should be installed in the weir box.
5 Coalescing
51 The selection of coagulation materials is based on the low water content of oily sewage, the properties of the oil, and can be determined through tests and technical and economic comparisons. Coagulation materials have excellent coagulation properties, good mechanical strength and chemical stability.
5.0.2 The design load of the coagulation section (chamber) should be obtained through tests based on the material type, particle size and filling height. When there is no test data, it can be selected according to Table 5.0.2. Coalescence section design parameter table
Design load
Material name
Serpentine
Smokeless butterfly
Polypropylene ball
20～30
20～30
20～30
20～30
2.5 ~ 4.0
5.0～10.0wwW.bzxz.Net
Filling height
1.0～1.2
1.0～ 1.2
1.0～1.2
Minimum separation section
Separation time
Table 5.0.2
Maximum water
Head loss of each section
1— 2
When the density of the coagulation material is less than the density of the oily sewage, measures should be taken to prevent the coagulation material from being lost or dislocated.
6 Coagulation
6.0.1 The selection of water purifier varieties and their dosage should be determined based on the raw water coagulation sedimentation test data or the operating experience of sewage treatment plants under similar conditions: through technical and economic comparison.
6.0.2 The mixing equipment must fully mix the added agent with the water. When using multiple agents, they should be added to the water in sequence according to the properties of the agents and process requirements. The mixing method generally adopts water pump mixing or pipeline mixing. When using water pump mixing, the residence time in the pipeline should not exceed 1 minute; when using pipeline mixing, the sum of the distance from the dosing port to the treatment device and the local head loss should be 0.3-~0.4m, otherwise a pipeline mixer or venturi tube should be installed.
6.0.3 Flocculation facilities can choose swirl flocculation cylinder or vortex flocculation cylinder. 6.0.3.1 The residence time of swirl flocculation cylinder should be 8-15 minutes. The water flow should enter along the tangent direction. The nozzle flow rate should be 2-3m/s. 6.0.3.2 The residence time of vortex flocculation cylinder should be 6-10 minutes. The nozzle flow rate should be 0.7m/s. The bottom cone angle should be 30°~～45°.
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