Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Facility Liquefied-Petroleum and Fuel Gas Piping
…120 unchanged lines
- Seismic shutoff device instructions
default:
− - Manufacturer instructions
+ - Regulator and relief manufacturer instructions
```
…40 unchanged lines
## The Contractor shall confirm the gas service - natural gas or LP gas - and the design delivery pressure with the serving utility or LP supplier before sizing and material selection.
−### Gas type and operating-pressure tier are the two decisions that cascade through the entire design: they set the pipe material, schedule, valve pressure rating, regulator strategy, and which sizing table applies. {note}
+```datasheet
+label: Design Delivery Pressure at Appliance
+type: radio
+options:
+ - 7 in. WC (natural gas low pressure)
+ - 11 in. WC (LP gas low pressure)
+ - 2 psi (medium-pressure two-stage)
+ - 5 psi (medium-pressure two-stage)
+default: 7 in. WC (natural gas low pressure)
+```
−### LP gas carries roughly 2.5 times the heating value per cubic foot of natural gas but a much higher specific gravity, so LP and natural gas use different sizing tables; applying natural gas tables to an LP system oversizes the pipe and understates velocity, which can mask regulator instability. {note}
−
```datasheet
label: Fuel Gas Service
…6 unchanged lines
```
+### Gas type and operating-pressure tier are the two decisions that cascade through the entire design: they set the pipe material, schedule, valve pressure rating, regulator strategy, and which sizing table applies. {note}
+
+### LP gas carries roughly 2.5 times the heating value per cubic foot of natural gas but a much higher specific gravity, so LP and natural gas use different sizing tables; applying natural gas tables to an LP system oversizes the pipe and understates velocity, which can mask regulator instability. {note}
+
+### The system operating pressure tier shall be specified, confirmed with the serving utility or LP supplier before sizing and material selection.
+
```datasheet
label: System Operating Pressure Tier
…11 unchanged lines
### NFPA 54 limits concealed interior piping to 5 psi precisely to keep a higher-pressure leak from accumulating inside a wall or chase; medium-pressure distribution above 5 psi inside an occupied building is a frequent and serious code violation. {note}
−```datasheet
−label: Design Delivery Pressure at Appliance
−type: radio
−options:
− - 7 in. WC (natural gas low pressure)
− - 11 in. WC (LP gas low pressure)
− - 2 psi (medium-pressure two-stage)
− - 5 psi (medium-pressure two-stage)
−default: 7 in. WC (natural gas low pressure)
−```
−
# Pipe Materials and Joints {toc}
…132 unchanged lines
## Relief and regulator vent discharges shall be piped to a safe outdoor location and shall not discharge into a building, pit, or area where gas could accumulate.
−### Because LP vapor is heavier than air, relief discharge points and any low-point accumulation areas must be evaluated for pooling; terminating discharge low or near a pit defeats the protection. {note}
+### Because LP vapor is heavier than air, relief discharge points and any low-point accumulation areas must be evaluated for pooling; terminating discharge low or near a pit defeats the protection.
```datasheet
…92 unchanged lines
## Piping shall be sized for the connected demand load at the design operating pressure so that the pressure drop from the meter or regulator to the most remote appliance outlet does not exceed the allowable value.
−### Low-pressure systems shall be sized to a maximum pressure drop of 0.5 in. WC by default per the NFPA 54 sizing tables; medium-pressure systems may be sized to a 1 psi maximum drop. {note}
−
−### Natural gas piping shall be sized using the NFPA 54 Schedule 40 steel table at specific gravity 0.60; LP gas piping shall be sized using the LP table at specific gravity 1.52; CSST shall be sized using the listed manufacturer's charts. {note}
−
−## The sizing basis shall account for identified future loads, and capped stub-outs or oversized mains shall be provided where future equipment is identified.
−
−### Omitting future-load provisions is a common and costly mistake: adding capacity after the fact often means replacing entire mains, so the sizing basis should state which future loads are included. {note}
−
```datasheet
label: Pipe Sizing Method
…27 unchanged lines
```
+### Low-pressure systems shall be sized to a maximum pressure drop of 0.5 in. WC by default per the NFPA 54 sizing tables; medium-pressure systems may be sized to a 1 psi maximum drop. {note}
+
+### Natural gas piping shall be sized using the NFPA 54 Schedule 40 steel table at specific gravity 0.60; LP gas piping shall be sized using the LP table at specific gravity 1.52; CSST shall be sized using the listed manufacturer's charts. {note}
+
+## The sizing basis shall account for identified future loads, and capped stub-outs or oversized mains shall be provided where future equipment is identified.
+
+### Omitting future-load provisions is a common and costly mistake: adding capacity after the fact often means replacing entire mains, so the sizing basis should state which future loads are included. {note}
+
# Bonding and Electrical Continuity {toc}
…6 unchanged lines
## Listed arc-resistant-jacket CSST may use the single-point bonding method permitted by its listing where accepted by the authority having jurisdiction.
−### Arc-resistant CSST (a listed conductive or jacketed system) carries relaxed bonding rules under ANSI LC-1; that relaxation applies only when the specific listed product and the manufacturer's instructions are explicitly invoked and the authority having jurisdiction accepts them. {note}
−
```datasheet
label: CSST Bonding Method
…6 unchanged lines
```
+### Arc-resistant CSST (a listed conductive or jacketed system) carries relaxed bonding rules under ANSI LC-1; that relaxation applies only when the specific listed product and the manufacturer's instructions are explicitly invoked and the authority having jurisdiction accepts them. {note}
+
# Testing {toc}
…49 unchanged lines
## Gas piping penetrating fire-rated walls and floors shall be firestopped with a listed firestop system in accordance with the building code.
−### PE pipe cannot penetrate a fire-rated assembly; it must transition to steel before reaching the rated wall or floor, and the steel penetration is then firestopped. {note}
+### PE pipe cannot penetrate a fire-rated assembly; it must transition to steel before reaching the rated wall or floor, and the steel penetration is then firestopped.
## Piping in egress paths and penetrations of fire-rated assemblies shall be located and protected in accordance with NFPA 101.
## Cold-climate LP systems with high peak demand shall be coordinated with a vaporizer where natural vaporization from the tank is insufficient for the design load.
−### Liquid LP must vaporize before it can be burned; in cold climates a high-demand load can outrun the tank's natural vaporization rate, so an electric immersion or atmospheric vaporizer is added - a coordination item with [[sync/boilers]] and the LP supplier. {note}
+### Liquid LP must vaporize before it can be burned; in cold climates a high-demand load can outrun the tank's natural vaporization rate, so an electric immersion or atmospheric vaporizer is added - a coordination item with [[sync/boilers]] and the LP supplier.
```datasheet
…63 unchanged lines
- Listed gas-rated thread sealant
```