Gas Pressure Regulation and Gas Pressure Regulation and Overpressure Protection Overpressure Protection
Protection Against Accidental Protection Against Accidental Overpressure Overpressure §192.195(a) §192.195(a) � A A Pipeline Connected to a Gas Source that Pipeline Connected to a Gas Source that could exceed could exceed MAOP MAOP as the result of Failure, as the result of Failure, must have Relieving or Limiting Devices must have Relieving or Limiting Devices meeting §192.199 & meeting §192.199 & §192.201 §192.201
Protection Against Accidental Protection Against Accidental Overpressure Overpressure §192.195(b) §192.195(b) � Additional Requirements for Distribution Additional Requirements for Distribution � Regulation Devices that Meet: Regulation Devices that Meet: � Pressure Pressure � Load Load � Other Service Conditions Other Service Conditions � During Normal Operation During Normal Operation
Protection Against Accidental Protection Against Accidental Overpressure Overpressure §192.195(b) §192.195(b) � and that could be and that could be activated in activated in the event the event of failure of failure of some of some portion of the system; portion of the system; and and � Be designed to Be designed to prevent accidental prevent accidental overpressuring. overpressuring.
Control of Pressure from High- Control of Pressure from High- Pressure Distribution Pressure Distribution MAOP < 60# MAOP < 60# §192.197(a) §192.197(a) � Service Regulato Service Regulators have the Following rs have the Following Characteristics - No Other Protection Required Characteristics No Other Protection Required � 1) Capable of reducing pressure for household 1) Capable of reducing pressure for household appliances. appliances.
MAOP < 60# MAOP < 60# §192.197(a) §192.197(a) � 2) Single Port Valve with 2) Single Port Valve with Proper Orifice Proper Orifice for Maximum for Maximum Pressure Pressure @ Reg. Inlet. @ Reg. Inlet. � 3) Seat Made of 3) Seat Made of Resilient Material. Resilient Material. � 4) Pipe Connections not 4) Pipe Connections not Excee Exceeding 2" Diameter. ing 2" Diameter.
MAOP < 60# MAOP < 60# §192.197(a) §192.197(a) � 5) 5) Capable Capable of of Accurately Accurately limiting during Normal limiting during Normal and No-flow Conditions. and No-flow Conditions. � 6) Self- 6) Self- Contained Contained without without External External Static or Control Lines. Static or Control Lines.
Protection Required Protection Required §192.197(b) §192.197(b) � If the Regulators used If the Regulators used do not meet do not meet ALL ALL Requirements Requirements � Or the Gas Contains Materials that Interferes Or the Gas Contains Materials that Interferes with the Operation of Regulators with the Operation of Regulators � Must be Suitable Devices to Prevent Must be Suitable Devices to Prevent Overpressure of Overpressure of Connected Appliances Connected Appliances
Control of Pressure from High-Pressure Control of Pressure from High-Pressure Distribution Distribution MAOP > 60# MAOP > 60# §192.197(c) §192.197(c) � One of the following Methods One of the following Methods must must be Used be Used to Regulate and Limit, to the to Regulate and Limit, to the Maximum Safe Maximum Safe Value Value, the Pressure Delivered to the , the Pressure Delivered to the Customer: Customer:
MAOP > 60# MAOP > 60# §192.197(c) §192.197(c) � (1) A (1) A Regulator Meeting the Six Regulator Meeting the Six Requirements and: Requirements and: � Another Regulator installed Another Regulator installed Upstream from the Service Upstream from the Service Regulator and a device installed Regulator and a device installed between the Two Regulators between the Two Regulators to limit Inlet Pressure on the to limit Inlet Pressure on the Service Regulator less than 60 Service Regulator less than 60 psig during Failure. psig during Failure.
MAOP > 60# MAOP > 60# §192.197(c) §192.197(c) � (2) A Service Regulator (2) A Service Regulator and Monitor and Monitor
MAOP > 60# MAOP > 60# §192.197(c) §192.197(c) � (3) A (3) A service regulator with service regulator with sufficient sufficient Internal Relief Internal Relief Capacity Capacity � or Additional Device to limit delivery or Additional Device to limit delivery pressure to a Safe Value pressure to a Safe Value � Used when inlet pressure does not exceed Used when inlet pressure does not exceed Manufacturer's rating or 125 psig, whichever Manufacturer's rating or 125 psig, whichever is Lower. is Lower.
MAOP > 60# MAOP > 60# §192.197(c) §192.197(c) � (4) A (4) A Service Regulator and an Automatic Service Regulator and an Automatic Shutoff device requiring Manual Reset. Shutoff device requiring Manual Reset.
Design of Pressure Relief and Limiting Design of Pressure Relief and Limiting Devices Devices §192.199 §192.199 � Each device must: Each device must: � a) Not be Impaired by Corrosion; a) Not be Impaired by Corrosion; � b) Have Valves and Seats designed not to b) Have Valves and Seats designed not to Stick in a Position Rendering the Device Stick in a Position Rendering the Device Inoperative; Inoperative; � c) Designed and Installed so it can be Readily c) Designed and Installed so it can be Readily Operated; Operated;
Design of Pressure Relief and Design of Pressure Relief and Limiting Devices Limiting Devices §192.199 §192.199 � d) Supports made of non- d) Supports made of non- combustibles combustibles � e) Discharge e) Discharge Stacks Stacks prevent Accumulations prevent Accumulations and Discharge without and Discharge without Hazard; Hazard; � f) Prevent f) Prevent Hammering Hammering of the of the Valve and Impairment Valve and Impairment of Capacity; of Capacity;
Design of Pressure Relief and Limiting Design of Pressure Relief and Limiting Devices Devices §192.199 §192.199 � g) Installed to Prevent g) Installed to Prevent Single Incident from Single Incident from affecting Regulator and affecting Regulator and Device; and Device; and � h) Prevent unauthorized h) Prevent unauthorized Operation of a stop valve Operation of a stop valve Rendering a Device Inoperative Rendering a Device Inoperative
Required Capacity of Pressure Required Capacity of Pressure Relieving and Limiting Stations Relieving and Limiting Stations §192.201(a) §192.201(a) � Each station Each station or group of stations must have or group of stations must have enough capacity, enough capacity, and and set to operate and set to operate and insure the following: insure the following: � 1) Low pressure distribution, 1) Low pressure distribution, protect connected utilization protect connected utilization equipment. equipment.
Required Capacity of Pressure Required Capacity of Pressure Relieving and Limiting Stations Relieving and Limiting Stations §192.201(a) §192.201(a) � 2) Pipelines other than low pressure 2) Pipelines other than low pressure distribution systems: distribution systems: MAOP > 60 # MAOP > 60 # MAOP + 10% or 75% MAOP + 10% or 75% SMYS, whichever is SMYS, whichever is lower; lower; MAOP > 12 # < 60 # MAOP > 12 # < 60 # MAOP + 6 # MAOP + 6 # MAOP < 12# MAOP < 12# MAOP + 50% MAOP + 50%
Required Capacity of Pressure Required Capacity of Pressure Relieving and Limiting Stations Relieving and Limiting Stations §192.201 §192.201 � a) Multiple feeds must have Devices installed At a) Multiple feeds must have Devices installed At each station to insure Against Failure of each station to insure Against Failure of the the Largest Capacity Component. Largest Capacity Component. � b) Devices must be Installed at or Near Each b) Devices must be Installed at or Near Each Station in a Low Pressure Distribution System, Station in a Low Pressure Distribution System, with capacity to Limit Main Pressure at Safe with capacity to Limit Main Pressure at Safe Values. Values.
Instrument, Control, and Sampling Pipe Instrument, Control, and Sampling Pipe and Components and Components §192.203(b) §192.203(b) � Materials and Design. All materials and Materials and Design. All materials and Components must be Designed to meet Components must be Designed to meet Service Conditions and the Following: Service Conditions and the Following: � 1) Takeoff fittings, bosses, or Adapters must 1) Takeoff fittings, bosses, or Adapters must withstand Temperatures, Pressures and withstand Temperatures, Pressures and Stresses without Fatigue Failure. Stresses without Fatigue Failure.
Instrument, Control, and Sampling Pipe Instrument, Control, and Sampling Pipe and Components and Components §192.203(b) §192.203(b) � 2) Except for takeoff lines that can be isolated from 2) Except for takeoff lines that can be isolated from sources of pressure by other sources of pressure by other valving, alving, a shutoff valve shutoff valve installed in each takeoff line and blowdown installed in each takeoff line and blowdown valves installed where necessary. valves installed where necessary. � 3) Brass or 3) Brass or copper may copper may not be used at not be used at temperature temperatures > 400 ºF > 400 ºF
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