SY/T 6514-2001 Preparation for hot work on tank bottom

This standard describes safety measures to prevent fire and explosion accidents when hot work is performed on the bottom of a tank. The term "hot work" used in this standard is defined as an operation that can produce sparks or flames hot enough to ignite flammable gases. SY/T 6514-2001 Preparation for hot work on the bottom of a tankSY/T6514-2001 Standard download decompression password: www.bzxz.net

Record number: 9601-2001
Petroleum and natural gas industry standard of the People's Republic of China SY/T 6514--2001bzxZ.net
Preparing tank bottoms for hat wtrk21-09-24 Issued
National Economic and Trade Commission
201-1 Implementation
7716514-2001
This standard is equivalent to the AP1u22 (Preparation for hot work on the bottom of the tank) of the Petroleum Society (1991). This standard describes the safety standards for preventing fire and explosion during hot work on the bottom of the tank. In the process of writing this standard, the customer needs are met. For example, the "introduction", "research documents", "special statement" and other contents are included. For the convenience of checking, the article number is the same as the original standard. This standard is issued by China National Petroleum Corporation and is the responsibility of the National Technical Committee for Oil Safety Standardization. The standard is issued by the National Environmental Protection Department of Shengli Petroleum Corporation. The main person in charge of this standard is Zhang Xiu, Li Junrong, Zhang Fuhai, Wu Qingshan, Cao Ma Baotong, Zhang Yali. Organization's Strategy STEP
One of the most significant long-term trends affecting the petroleum industry is public concern about environmental issues. Recognizing this trend, API member companies have developed a proactive, forward-looking strategy called Strategy for Today's Environmental Partnership (SIEI\). This program focuses on addressing issues of public concern by improving the industry's environmental, health, and safety performance, documenting improved performance, and communicating with the public on these issues. The foundation of the Strategy for Today's Environmental Partnership (STEP) is the API Environmental Objectives and Guiding Environmental Principles, AFI standards, which are achieved through the use of unique and effective engineering practices and operational processes. An important part of the Strategy for Today's Environmental Partnership (STFP) program
API Environmental Mission and Environmental Principles Guide
The American Petroleum Association's quality of service is achieved through the economic development of resources and the provision of high-quality products and services to consumers. We strive to improve the environmental performance of our operations by leveraging our resources to protect the safety of our employees and the public. We work collaboratively with the public, governments, and others to fulfill our responsibilities in the development and use of natural resources in a manner that protects the environment. To meet these responsibilities, API ensures that its operations are managed in accordance with the following principles: Identify and respond to public concerns about the handling of our raw materials, products, and processes; Operate our facilities, store, and transport our raw materials and products in a manner that protects the environment and the safety and health of our employees and the public; Make safety, health, and environmental considerations a priority in our planning and development of new products and processes; Provide advice to appropriate officials, employees, customers, and the public regarding significant industry-related safety, health, and environmental hazards and develop protective measures; Provide appropriate information about the use of our raw materials, products, and waste materials; ■ Advise customers, transporters or others to: ■ Economically generate and produce natural resources and conserve these resources by using energy economically; ■ Develop our knowledge of the safety, health and environmental impacts of our raw materials, products, processes and waste materials by conducting or funding research; ■ Take responsibility for reducing the total amount of leaks and wastes; ■ Cooperate with other departments to solve the transportation and disposal problems of hazardous substances caused by our operations; ■ Participate in the process of formulating laws, procedures and standards with other departments to safely protect the public, the environment and the environment; ■ Provide experience and assistance to other departments that produce, handle, use, transport or consume similar raw materials, petroleum products and materials to meet our principles and practices.
1 Overview
1.1 Introduction and Model
Standards for the Petroleum and Natural Gas Industry of the People's Republic of China Preparing for Hot Work
1enk Lotteuxs for hol wockSY/T 6514—2001
This standard describes safety measures to prevent fire and explosion when hot work is performed on the bottom. The term "hot work" as used in this standard is defined as an operation that can produce sparks to form flames hot enough to ignite flammable gases. A container containing flammable and combustible liquids, regardless of age or type, should be considered unsafe for hot work until it is made safe by a safety inspection. These inspections include gas containment to determine whether the oxygen content in each container is between 19.5% and 22.5%. Hot work on the bottom requires special skills to prevent the flammable gases that may be lurking in the bottom from being ignited. Although each connection to the bottom must be carefully considered, the safety measures outlined in the technical standard provide a comprehensive method for preparing for hot work on the bottom. This measure is suitable for most situations. 1.2 The latest edition of the following standards, specifications and regulations shall be referenced. API Puh 1200g Safety welding in vehicle plants, natural gas plants and petrochemical plants API Puhl 2015 Cleaning of above-ground leaded gasoline storage tanks 2 Degree and treatment of steel materials Abl 22[
AP[Publ 221A Guide to working in confined spaces in the petroleum industry. API Publ 2217A Guide to working in confined spaces in the petroleum industry 2 Preventive measures 2.1 Preventive measures 2.1.1. Hot work must be conducted in a clean, ventilated and tested for the presence of flammable gases and lack of oxygen (AP[Publ 2015 and 2217).
2.1.2 A visual inspection of the hot work area is necessary: ​​a qualified person with training or experience should be responsible for authorizing the work and setting the subsequent precautions. 2.1.3 Appropriate emergency fire fighting equipment, such as fire extinguishers and hoses, should be ready and available at all times. Subordinates should be taught the correct use of such equipment.
2.2 Special precautions
2.2.1 Before the start of work, a permit for entry and hot work must be strictly issued and distributed. 2.2.2 During entry and hot work, an efficient fan suitable for the corresponding electrical area level is running. The fan must be able to provide sufficient fresh air to all people in the area. 2.2.3 During entry and hot work, the output lines that have been disconnected from the terminal, the sound board or the selector should not be disturbed. 2.2.4 Surfaces that have come into contact with leaded gasoline should be scraped to a soft dew limit. At each end of the pipeline that may be overheated due to welding or other operations, at least a certain area should be scraped to expose the metal. As an alternative to scraping to expose the metal, the welder should use supplied air breathing equipment. If the above areas are not scraped to expose the metal, other personnel in the pipeline may not wear supplied air breathing equipment as long as the air quality monitoring conducted regularly during the hot work shows that the air is safe. The National Economic and Trade Commission approved 2002-(1-01 implementation plan on September 24, 2001 (see API 2015). ST/TS14-200t
2.2.5 The mill connection line should be directly connected to the wall where the hot work is performed (see API 2015). 2.3. Gas cylinders used in cutting operations should be securely fastened and effectively placed outside, at a safe distance from personnel. When not in use, the gas hose should be cut off at the gas cylinder and placed outside. The gas supply hose and hose connectors should be placed in the home channel. Please check for leakage:
The compressed air supply system must be protected from damage outside the enclosure, which may cause damage to the system, rupture or death. 2.2.7 During the operation, the oxygen and flammable and toxic gases in the working area must be monitored. 3 Inspection procedures
3.1 General procedures
When planning the replacement, no matter whether there is any suspicious situation, a follow-up inspection must be carried out. 3.1 Special procedures ||t t||In each area where hot work is to be carried out, it is sometimes necessary to make small holes of appropriate size in the tank bottom by cold drawing or drilling. These holes are convenient for inspection and to prevent internal gas leakage. When making these holes, care must be taken to avoid the creation of ignition sources that could lead to the release of flammable gases or explosions from the bottom. If the bottom is to be repaired and any foreign objects that might be buried in the bottom are carefully removed: the hot work is not carried out.The most likely point of the insulation is to be removed. Before the insulation is removed, determine its type so that it can be removed correctly.
4 Safe working procedures
Based on the operation, the type of hot work described in this section and the results of the inspection are used to determine the working procedures. The safe working procedures described in 4.2 to 4.6 only apply to conditions where flammable colloids or gases are or may be present. These procedures are not intended to cover all types of hot work that may be encountered by the operator: however, these safe working procedures do cover a range of cases where the safe working procedures can be applied in these conditions. The safe working procedures should be in written form and approved by a qualified, trained or experienced person.
4.2 Minor repairs include welding and other work such as welding of support frames or support channels. If the bottom is not properly cleaned, the following procedure should be used:
) Drill and measure a thread suitable for 1.3 in (1/2 in) pipe adjacent to the repair area. Connect the oxygen or other inert gas to the 1.3 m (12 in) end of the pipe using hardware. Reduce overpressure at the bottom of the tank using a pressure control valve. ) Before starting hot work, establish an inert gas flow in any area to be prepared to ensure that any flammable gases have been driven or released so that they cannot ignite. When using inert gas flow, monitor the oxygen content of the gas to ensure that the gas content is between 19.5% and 22.5%.
e) When the local area has been completely reduced, remove the small gas flow, remove the pipe, use a trunnion pin or other means to separate the hole, and immediately weld the bottom before moving to another area. 4.3 General
Half repair involves most of the bottom, and the flammable liquid of the bottom is collected by water. This can be completed in the following ways:
SYT6514001
&) Build a top cover outside the tank. This should be higher than the highest bottom in the tank (see Figure 1). b) Make some holes suitable for 1.3cm (1/2in) holes at the top of the building; these holes should be located to ensure that all the flammable gas or gas below can be replaced by water. c) Install a vent and check point. The height of the connection should be comparable to the temporary vent. 1. Fill the wax bottom space with water until each joint overflows, and keep supplying water to maintain a stable filter surface in the big jar to ensure that there will be no gaps in the bowl under awkward conditions.
e) Check for leaks in the jar and plug them if necessary to maintain the end-to-end process. 1) When the treatment is completed, change the water in the empty earth embankment to be just below the joint, remove the joint, plug the torque with a pin or other measures, and weld it.
Dead end ±30[121n)
Note the connection amount
30 below the working point
The bottom is bad and the bottom is bad
4.4 Lake energy treatment
Figure 1 Preparation of the treatment tank
During the preparation hall, the cleaning around the bottom of the media can be carried out safely: + pack 15.
(61a) thickness
a) During the control period, avoid the edge of the hot working area, at least 30 away from any point. The excavated hole should be large enough to ensure that workers can work safely and comfortably when excavating and using liquid gas barriers. The environment in this area should be clearly monitored to ensure that the oxygen content is between 19.5% and 22.5%. Seal all openings between the bottom plate and the base with mud or other suitable non-isolated materials. The situation should be checked regularly. Walking should be limited to the bottom of the tank to ensure that the seal remains intact (see Figure 1). Use a gas indicator to check the excavated hole and the gradual sliding between the bottom and the base. d) At the beginning of hot work and while working, monitor the surrounding area, including the hole and the inside of the medium, to see if there is any chemical contamination floating in the air. If necessary, the hole can be ventilated with a corresponding explosion-proof electrical appliance. Note: After the compensation is completed, the hole should be repaired immediately to prevent the foundation from being damaged. 4.5 Double bottom installation
When building a new double bottom, the following procedures can be followed: a) Place about 100 μm of sand or other material on the stone bottom plate; b) Install a new bottom directly.
If there is no flammable gas in the original bottom, even if the old bottom falls on an oil-free foundation, it is still safe to carry out the repair work on the new bottom. In addition, if there is a possibility of connecting the two layers of oil and sand and the new bottom to be connected, it is possible to carry out the repair work.
4.6 Cutting and repairing
When repairing the bottom, the following methods can be used: a) Use manual or pneumatic tools to cool the bottom to be replaced and remove it. Coolant should be continuously used to cool the cutting edge to reduce friction heat.
b) Remove soil from the area to be replaced, fill it with compacted sand, and seal it with mud or other non-corrosive composite materials.
) Continuously monitor this area for oxygen deficiency and the presence of leaky or toxic gases. d) When a large area of ​​the tank bottom must be replaced, the continued effectiveness of the seal is a question. When hot work is carried out, maintain a safe area under this area: When work is carried out in an inert atmosphere or around it, this area should be continuously monitored with an oxygen analyzer.5% between
) Seal all openings between the bottom plate and the foundation with mud or other chemically suitable non-isolated materials. The situation should be checked regularly during the tour. The movement should be limited to walking on the bottom of the tank to ensure that the seal remains intact (see Figure 1). d) Use a gas indicator to check the gradual sliding between the excavated pit and the lower and foundation. d) Before starting hot work and while working, monitor the surrounding area, including the pit and the interior of the pit, to see if there is any chemical contamination floating in the air. d) If necessary, the pit can be ventilated with a corresponding explosion-proof electrical appliance. Note: After the compensation is completed, the hole should be repaired immediately to prevent the foundation from being damaged. 4.5 Double bottom installation
When building a new double bottom, the following procedures can be followed: a) Place about 100 μm of sand or other material on the stone bottom plate; b) Install a new bottom directly.
If there is no flammable gas in the original bottom, even if the old bottom falls on an oil-free foundation, it is still safe to carry out the repair work on the new bottom. In addition, if there is a possibility of connecting the two layers of oil and sand and the new bottom to be connected, it is possible to carry out the repair work.
4.6 Cutting and repairing
When repairing the bottom, the following methods can be used: a) Use manual or pneumatic tools to cool the bottom to be replaced and remove it. Coolant should be continuously used to cool the cutting edge to reduce friction heat.
b) Remove soil from the area to be replaced, fill it with compacted sand, and seal it with mud or other non-corrosive composite materials.
) Continuously monitor this area for oxygen deficiency and the presence of leaky or toxic gases. d) When a large area of ​​the tank bottom must be replaced, the continued effectiveness of the seal is a question. When hot work is carried out, maintain a safe area under this area: When work is carried out in an inert atmosphere or around it, this area should be continuously monitored with an oxygen analyzer.5% between
) Seal all openings between the bottom plate and the foundation with mud or other chemically suitable non-isolated materials. The situation should be checked regularly during the tour. The movement should be limited to walking on the bottom of the tank to ensure that the seal remains intact (see Figure 1). d) Use a gas indicator to check the gradual sliding between the excavated pit and the lower and foundation. d) Before starting hot work and while working, monitor the surrounding area, including the pit and the interior of the pit, to see if there is any chemical contamination floating in the air. d) If necessary, the pit can be ventilated with a corresponding explosion-proof electrical appliance. Note: After the compensation is completed, the hole should be repaired immediately to prevent the foundation from being damaged. 4.5 Double bottom installation
When building a new double bottom, the following procedures can be followed: a) Place about 100 μm of sand or other material on the stone bottom plate; b) Install a new bottom directly.
If there is no flammable gas in the original bottom, even if the old bottom falls on an oil-free foundation, it is still safe to carry out the repair work on the new bottom. In addition, if there is a possibility of connecting the two layers of oil and sand and the new bottom to be connected, it is possible to carry out the repair work.
4.6 Cutting and repairing
When repairing the bottom, the following methods can be used: a) Use manual or pneumatic tools to cool the bottom to be replaced and remove it. Coolant should be continuously used to cool the cutting edge to reduce friction heat.
b) Remove soil from the area to be replaced, fill it with compacted sand, and seal it with mud or other non-corrosive composite materials.
) Continuously monitor this area for oxygen deficiency and the presence of leaky or toxic gases. d) When a large area of ​​the tank bottom must be replaced, the continued effectiveness of the seal is a question. When hot work is carried out, maintain a safe area under this area: When work is carried out in an inert atmosphere or around it, this area should be continuously monitored with an oxygen analyzer.
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