(1) A Class 1 location is: (i) An offshore area; or (ii) Any class location unit that has 10 or fewer buildings intended for human occupancy. (2) A Class 2 location is any class location unit that has more than 10 but fewer than 46 buildings intended for human occupancy.
What is a Class II hazardous location?
Locations that are hazardous because of the presence of combustible dust. Note that the dust must be present in sufficient quantities for a fire or explosion hazard to exist. The fact that there is some combustible dust present does not mean a Class II hazardous location exists.
What is the difference between Class 1 and Class 2?
(1) A Class 1 location is: (i) An offshore area; or. (ii) Any class location unit that has 10 or fewer buildings intended for human occupancy. (2) A Class 2 location is any class location unit that has more than 10 but fewer than 46 buildings intended for human occupancy.
What is the difference between Class 2 and Class 3 locations?
(2) A Class 2 location is any class location unit that has more than 10 but fewer than 46 buildings intended for human occupancy. (3) A Class 3 location is: (i) Any class location unit that has 46 or more buildings intended for human occupancy; or.
What is a class location unit?
( 1) A “class location unit” is an onshore area that extends 220 yards (200 meters) on either side of the centerline of any continuous 1- mile (1.6 kilometers) length of pipeline. ( 2) Each separate dwelling unit in a multiple dwelling unit building is counted as a separate building intended for human occupancy.
What is a Class 3 Division 2 location?
Class Definition Class II locations are those in which combustible dust may be found. Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings.
What is a Class 1 location?
Class I locations consist of areas where gases, vapors or liquids may exist that have the potential to become flammable or ignitable.
What is a Class 3 hazardous location?
Class III hazardous locations, according to the NEC, are areas where there are Easily ignitable fibers or flyings present, due to the types of materials being handled, stored, or processed.
What is a Class 1 Division 2 location OSHA?
Note to the definition of "Class I, Division 2:" This classification usually includes locations where volatile flammable liquids or flammable gases or vapors are used, but which would become hazardous only in case of an accident or of some unusual operating condition.
What are Class 3 locations?
Some typical Class III locations are: Textile mills, cotton gins; • Cotton seed mills, flax processing plants; and • Plants that shape, pulverize or cut wood and create sawdust or flyings. Standards have been developed that identify what equipment may be used in the hazardous locations.
What is a Class 3 Division 1 location?
A Class III, Division 1 location is a location where the equipment producing the ignitable fibers or flyings is located or where the material is handled. It is a location where ignitable concentrations of ignitable fibers or flyings can exist all of the time or some of the time under normal operating conditions.
What is a Class 4 hazard?
Class 4 dangerous goods include flammable solids, substances liable to spontaneous combustion and substances which, in contact with water, emit flammable gases.
What is the difference between Class 1 Division 1 and Division 2?
Class 1 Hazardous Locations refer to facilities that deal with flammable gases, vapors, and liquids. Division 2 specifies that flammable materials are handled, processed, or used at a location. But, concentrations of hazardous substances are not high enough to be ignitable.
What is a hazard category 4?
Hazard Class 4: Flammable Solids.
Does Class 2 Div 2 require explosion proof?
To meet the requirements for Division 2, a light does not have to be able to contain an explosion. Instead, they must be found to be unable to cause an explosion in environments for which they are approved to be used.
What is a Category 2 OSHA employee?
OSHA sets categories based on the exposure level to a hazard while performing routine job tasks. Category 1 employees are all exposed to a specific hazard as a regular part of their job. Category 2 contains employees who are occasionally exposed to a hazard.
What is a Class 2 Division 2?
Class II, Division 2 locations are those in which combustible dust will not normally be in suspension nor will normal operations put dust in suspension, but where accumulation of dust may interfere with heat dissipation from electrical equipment or where accumulations near electrical equipment may be ignited.
What is a Class 1 location NEC?
Class I Hazardous Locations refer to facilities which deal with flammable gases, vapors, and liquids. Division 2 specifies that these flammable materials are handled, processed, or used in the defined hazardous location, but are not normally present in concentrations high enough to be ignitable.
What is the difference between Class 1 Division 1 and Division 2?
Class 1 Hazardous Locations refer to facilities that deal with flammable gases, vapors, and liquids. Division 2 specifies that flammable materials are handled, processed, or used at a location. But, concentrations of hazardous substances are not high enough to be ignitable.
What is a Class 1 Division 1 environment?
Class I, Division 1 classified locations. An area where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operating conditions. A Class I, Division 1 area encompasses the combination of Zone 0 and Zone 1 areas.
What is a Class 1 item?
Examples of Class I appliances are refrigerators, microwaves, kettles, irons, and toasters. Appliances under Class I have two levels of protection: the basic insulation and the earth connection. Inside the appliance, there are three wires connected to three different pins. The wires are called Live, Neutral, and Earth.
What is a Class II hazardous location?
Locations that are hazardous because of the presence of combustible dust. Note that the dust must be present in sufficient quantities for a fire or explosion hazard to exist. The fact that there is some combustible dust present does not mean a Class II hazardous location exists. To be considered a “dust”, the combustible material must exist as a finely divided solid of 420 microns (0.420 mm) or less. Such a dust will pass through a No. 40 sieve. Just as in Class I, Division 1 and 2, the subdivision of Class II into Divisions 1 and 2 identifies the likelihood that there will be an explosion hazard.
What are the three groups of Class II dust?
Class II location groups are determined by: the ignition temperature of the dust, the electrical conductivity of the dust, and the thermal blanketing effect the dust can have on heat-producing equipment such as lighting fixtures and motors.
What is division 2?
Division 2. Location where combustible dust is not normally in the air in sufficient quantity to produce an explosion, and dust accumulations are not normally sufficient to interfere with the normal operation of electrical equipment.
What is a class 2 UL?
NEC and UL segregate this hazardous location into two divisions. Class II Division 1 is in an area where dust material is handled, manufactured, or used. Class II Division 2 is where the dust material is stored or handled other than in the process of manufacturing. In both divisions, it is important to protect your electrical systems ...
What are the two classes of hazardous areas?
The National Electrical Code, or NEC, classifies hazardous areas into three different categories; Class I, Class II, and Class III. To use equipment in or around these types of areas, caution has to be taken to not cause an explosion or fire.
What is a Hazloc cabinet cooler?
First, HazLoc Cabinet Coolers are designed to keep electrical components cool during summer months and higher ambient conditions. They are powered by an EXAIR Vortex Tube which only uses compressed air to generate cold air. They do not have any moving parts, refrigerant, or refrigerant compressors to fail.
Does Exair Hazloc have moving parts?
They do not have any moving parts, refrigerant, or refrigerant compressors to fail. These simple, but effective, cooling devices can be used in the toughest of environments. With the Vortex Tube as the “engine”, the reliability of the EXAIR HazLoc Cabinet Cooler is unmatched.
What is a Class II plant?
Class II locations consist of locations where combustible dusts may exist that have the potential to become flammable or ignitable. Locations that would be considered to be Class II include Grain elevators, Flour and feed mills, Metal powder manufacturers, and Coal plants, etc.
What is division 2?
Division 2 is also a subset of Class I and is classified as an area where the explosive or flammable gases, vapors or liquids mentioned above are not likely to exist during regular operation.
What is Zone 1?
Zone 1 is described as the presence of explosive or flammable gases, vapors or liquids for some of the time during normal operating conditions.
What is Class I?
Class I locations consist of areas where gases, vapors or liquids may exist that have the potential to become flammable or ignitable. There are two different divisions that exist in Class I, Division 1 and Division 2, along with three Zones; Zone 0, 1 & 2. Locations that would be considered to be Class I include Petroleum Refineries, ...
What is a hazardous location?
Hazardous Locations consist of areas where there is the potential for a fire or explosion due to electrical equipment that is in operation in this area with a reaction to flammable or ignitable gases, liquids, vapors, combustible dusts, fibers or flyings. The need for Explosion-Proof equipment then arises due to this potential for fire or explosion.
What is a type 3 enclosure?
TYPE 3 - Type 3 enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet and external ice formation.
What is a type I system?
Type “i” (Exi): Intrinsically Safe Systems are incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause and ignition of a given explosive atmosphere (for all Zones, 0, 1 and 2).
What is class location?from federalregister.gov
Class locations were an early method of differentiating risk along gas pipelines. The class location concept pre-dates Federal regulation of pipelines. These designations were previously included in the ASME International standard, “Gas Transmission and Distribution Pipeline Systems,” (ASME B31.8) from which the initial pipeline safety regulations were derived.
How does a class location change?from federalregister.gov
A class location can change as population grows and more people live or work near the pipeline. When a class location changes, pipeline operators must either reduce the pipe's operating pressure to reduce stress levels in the pipe; replace the existing pipe with pipe that has thicker walls or higher yield strength to yield a lower operating stress at the same operating pressure; or where the class is changing only one class rating, such as from a Class 1 to Class 2 location, conduct a pressure test at a higher pressure. Operators can apply for special permits to prevent the need for pipe replacement or pressure reduction after a class location changes. Based on certain operating safety criteria and periodic integrity evaluations, PHMSA has approved some class location special permits.
What happens if a class location increases and the current MAOP is not commensurate with the MAOP?from federalregister.gov
If a class location increases and the current MAOP is not commensurate with the MAOP for the newly determined class location, besides applying for a special permit, the existing regulations require that the operator: (1) Reduce the pipeline's MAOP to reduce stress levels in the pipe;
What is a high consequence area?from federalregister.gov
The term “high consequence area” is used to identify pipelines that are subject to ongoing pipeline integrity assessments. HCAs are defined by counting the number of dwellings for human occupancy or identified sites where people congregate or where they are confined, such as a hospital, daycare facility, or a retirement or assisted-living facility, within a calculated impact circle that a potential pipeline failure could affect. Operators must periodically inspect the condition of their pipelines in an HCA and remediate any degradation that might affect the pipeline's integrity.
What is the Regulatory Flexibility Act?from federalregister.gov
601 et seq.) requires federal agencies to review each rulemaking action to consider whether it would have a “significant economic impact on a substantial number of small entities” to include small businesses, not-for-profit organizations that are independently owned and operated and are not dominant in their fields, and governmental jurisdictions with populations under 50,000. This NPRM was developed in accordance with Executive Order 13272, “Proper Consideration of Small Entities in Agency Rulemaking” ( 68 FR 7990, Feb. 19, 2003) and DOT's procedures and policies to promote compliance with the RFA and to ensure that the potential impacts of a regulatory action on small entities were properly considered.
What is section 192.3?from federalregister.gov
In support of the regulations proposed in this NPRM, PHMSA is proposing new definitions for the terms “Class 1 to Class 3 location segment” and “in-line inspection segment.” These two terms define the segments to which the requirements of the proposed § 192.618 would apply.
How to determine class location of a pipeline?from federalregister.gov
Class location is determined by counting the number of dwellings within 660 feet of the pipeline for 1 mile (for Classes 1-3) or by determining that four-story buildings are prevalent along the pipeline (Class 4). Design factors, which are used in the formula to determine the design pressure for steel pipe and which generally reflect the maximum allowable percentage of SMYS, are 0.72 for Class 1, 0.60 for Class 2, 0.50 for Class 3, and 0.40 for Class 4. Pipelines are designed based on population along their route, and thus class location.
What is class location?from federalregister.gov
Class locations were an early method of differentiating risk along gas pipelines. The class location concept pre-dates Federal regulation of pipelines. These designations were previously included in the ASME International standard, “Gas Transmission and Distribution Pipeline Systems,” (ASME B31.8) from which the initial pipeline safety regulations were derived.
How does a class location change?from federalregister.gov
A class location can change as population grows and more people live or work near the pipeline. When a class location changes, pipeline operators must either reduce the pipe's operating pressure to reduce stress levels in the pipe; replace the existing pipe with pipe that has thicker walls or higher yield strength to yield a lower operating stress at the same operating pressure; or where the class is changing only one class rating, such as from a Class 1 to Class 2 location, conduct a pressure test at a higher pressure. Operators can apply for special permits to prevent the need for pipe replacement or pressure reduction after a class location changes. Based on certain operating safety criteria and periodic integrity evaluations, PHMSA has approved some class location special permits.
What happens if a class location increases and the current MAOP is not commensurate with the MAOP?from federalregister.gov
If a class location increases and the current MAOP is not commensurate with the MAOP for the newly determined class location, besides applying for a special permit, the existing regulations require that the operator: (1) Reduce the pipeline's MAOP to reduce stress levels in the pipe;
What is a high consequence area?from federalregister.gov
The term “high consequence area” is used to identify pipelines that are subject to ongoing pipeline integrity assessments. HCAs are defined by counting the number of dwellings for human occupancy or identified sites where people congregate or where they are confined, such as a hospital, daycare facility, or a retirement or assisted-living facility, within a calculated impact circle that a potential pipeline failure could affect. Operators must periodically inspect the condition of their pipelines in an HCA and remediate any degradation that might affect the pipeline's integrity.
What are the classes of natural gas pipelines?from federalregister.gov
Gas transmission pipelines are divided into classes from 1 (rural areas) to 4 (densely populated, high-rise areas) that are based on the number of buildings or dwellings for human occupancy in the area. This concept is to provide safety to people from the effects of a high-pressure natural gas pipeline leak or rupture that could explode or catch on fire. PHMSA uses class locations in 49 CFR part 192 to implement a graded approach in many areas that provides more conservative safety margins and more stringent safety standards commensurate with the potential consequences based on population density near the pipeline. When crafting the natural gas Start Printed Page 36862 regulations, DOT's Office of Pipeline Safety (OPS) determined that these more stringent standards were necessary because a greater number of people in proximity to the pipeline substantially increases the probabilities of personal injury and property damage in the event of an accident. At the same time, the external stresses, the potential for damage from third-parties, and other factors that contribute to accidents increase along with the population; consequently, additional protective measures are often needed in areas with greater concentrations of population.
How many special permits are there for class location?from federalregister.gov
Since 2004, PHMSA has approved over 15 class location special permits based on operators adopting additional conditions, including certain operating safety criteria and periodic integrity evaluations. [ 19 20] Generally, the additional conditions PHMSA requires are designed to identify and mitigate integrity issues that could threaten the pipeline segment and cause failure, especially given the fact that the majority of class location special permits it receives and reviews are for older pipelines that may have manufacturing, construction, or ongoing maintenance issues, such as seam or pipe body cracking, poor external coating, insufficient soil cover, lack of material records, dents, or repairs not made to class location design safety factors.
When was the PHMSA class location workshop?from federalregister.gov
On April 16, 2014, PHMSA sponsored a Class Location Workshop to solicit comments on whether applying the gas pipeline IM program requirements beyond HCAs would mitigate the need for gas pipeline class location requirements. Presentations were made by representatives from PHMSA, the National Energy Board of Canada (NEB), National Association of Pipeline Safety Representatives (NAPSR), pipeline operators, industry groups, and public interest groups. [ 26]
What is a Class 1 Division 2 motor?from lsleds.com
There are two things. Class II Group F & G approvals are required for explosion-proof motor with temperature protection.
What is zone 2 in ATEX?from assured-systems.com
ATEX Zone 2. A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapor or mist is not likely to occur in normal operation but , if it does occur, will persist for a short period only.
What is ATEX zone 22?from assured-systems.com
ATEX Zone 22. A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but , if it does occur, will persist for a short period only.
How many classes are there in the NEC?from blog.exair.com
The National Electric Cod (NEC) has a system to delineate areas by Class, Division, and Group, based on the specific nature of the hazard. There are three Classes, each with two Divisions, and a number of Groups that may apply to each of those Divisions. Today, we’re going to learn about Class I, Div 1, and the Groups that EXAIR HazLoc Cabinet ...
What is the division of UL?from assured-systems.com
UL Divisions for Operating Conditions. Divisions go further in classifying how often the flammable or explosive substances are likely to be present under normal operating conditions. Division 1. Flammable substances are continually present or are likely to exist under normal operating conditions. Division 2.
What is a Class 1 location NEC?
Facilities that deal with flammable gases, vapors, and liquids are classified as Class 1 hazardous locations. The flammable materials are handled, processed, or used in a hazardous location, but are not usually present in concentrations high enough to beignitable.
What is a Class 2 hazardous location?
There are two types of hazardous locations, the second being called a Class II location. The classification is created by the presence of dust in the air that is sufficiently large to make it explode.
What is a Class 3 hazardous location?
Class III hazardous locations are areas where there are Easily ignitable fibers or flyings present because of the types of materials being handled, stored, or processed.
