InstaBidsTypes of gas line?
Gas-line types suit different routes: Hawaii Gas names steel or CSST indoors and PE underground in its utility guide. Separate the buried yard line from indoor distribution before choosing: Hawaii Gas specifies 18-inch PE cover, while Gastite lists a 25 PSI CSST rating and a 160°F jacket operating limit. (source: Hawaii Gas)
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Gas piping materials: match the route first
| Options | Location and material | Difference to put in writing |
|---|---|---|
| Rigid steel: black or galvanized | Hawaii Gas names black or galvanized iron/steel for interior and aboveground customer piping. | Name the material and exterior protection; buried metal requires attention to corrosion and condition. |
| Corrugated stainless steel tubing (CSST) | Flexible metallic distribution tubing; distinct from the short flexible connector at an appliance. | Name the tubing system, fittings and bonding details; jacket color alone is not a full product specification. |
| Polyethylene (PE) | Gas-rated plastic for buried outdoor piping; read the applicable model-code exceptions for specified terminations and outdoor slabs. | State burial, tracer and riser details. Hawaii Gas specifies 18 inches minimum cover; local requirements for your job must be established separately. |
| Copper tubing | 2024 IRC G2414.4.3 identifies Type K or L of ASTM B88, or ASTM B280, subject to the section’s gas-chemistry restrictions. | Confirm the tubing specification, fuel compatibility and local utility acceptance before comparing a copper bid. |
CSST limits are product-specific
| Options | Published product limit | How to compare a bid |
|---|---|---|
| CSST pressure rating | 25 PSI in the Gastite January 2020 guide, under ANSI LC1/CSA 6.26. | A product-system operating rating; not an appliance supply-pressure specification. |
| CSST jacket: bending temperature | -40°F minimum installation temperature for bending in that guide. | A product installation threshold; have the contractor use the actual product’s current instructions. |
| CSST jacket: operating temperature | 160°F maximum operating temperature in that guide. | A jacket temperature limit; not a service-life estimate or an overall climate ranking. |
Check exposure and condition, then choose the system
Buried piping: inspection and corrosion
Peoples Gas recommends annual inspection of customer-owned buried piping and warns of corrosion or deterioration. Ask how the proposed material and route will be inspected.
Suspected leak: leave before arranging work
Strong odor or a blowing or hissing sound can indicate a gas leak or damaged line. Leave the location and contact your gas utility or emergency services from elsewhere; a job request is not an emergency response.
What type of gas line can be buried?
Buried gas-line bids can specify gas-rated polyethylene (PE); Hawaii Gas’s utility guide specifies a minimum burial of 18 inches. That is a local specification, not a nationwide depth. The 2024 IRC also addresses plastic pipe outdoors underground, with exceptions for specified terminations and certain outdoor slabs.
The utility’s guide also specifies number 10 copper tracer wire or another accepted material, and a metallic riser transition. Ask the contractor to state the locally applicable burial, locating and transition requirements instead of supplying a bid that only says “plastic gas line.”
Source: Gas Piping Material — local utility engineering guide, read 2026-11-09
Source: 2024 IRC, current publisher version V2.1, Chapter 24, read 2026-11-09
What type of gas line to run in house?
Indoor gas-line choices include rigid steel and CSST. Hawaii Gas names “iron or steel (galvanized or black)” in its customer-piping guide; SoCalGas describes CSST as an alternative to steel pipe. Ask for the exact material and system in writing, with the route and local utility requirements.
The 2024 IRC’s plastic-pipe location rule reads: “Plastic pipe shall be installed outdoors underground only.” Section G2415.17.1 includes specific exceptions; a buried PE yard line should therefore be compared separately from the interior distribution system.
Source: Gas Piping Material — local utility engineering guide, read 2026-11-09
Source: Corrugated Stainless Steel Tubing, read 2026-11-09
Source: 2024 IRC, current publisher version V2.1, Chapter 24, read 2026-11-09
What type of gas line for propane?
Propane gas-line selection needs the fuel and product system named together. Gastite’s January 2020 guide includes natural gas and propane in its CSST system-standard discussion and lists a 25 PSI operating pressure rating. The rating is a product limit, not the supply pressure to request for an appliance.
Source: Gastite and FlashShield+ Design and Installation Guide, January 2020, read 2026-11-09
Can gas lines be copper?
Copper gas-line tubing is addressed in the 2024 IRC. Section G2414.4.3 names “Standard Type K or L of ASTM B88 or ASTM B280”; the full section also limits use according to gas chemistry. Ask the contractor to confirm the fuel, applicable local code and utility acceptance before selecting copper.
Source: 2024 IRC, current publisher version V2.1, Chapter 24, read 2026-11-09
Can gas lines be flexible?
Flexible gas lines can use CSST, but CSST distribution tubing and appliance connectors are different products. SoCalGas makes that distinction explicitly. Gastite’s January 2020 guide lists a 160°F maximum plastic-jacket operating temperature and a -40°F minimum installation temperature for bending; these limits apply to the specified product.
SoCalGas notes that CSST can have a yellow or black exterior coating and distinguishes it from flexible appliance connectors.
Source: Gastite and FlashShield+ Design and Installation Guide, January 2020, read 2026-11-09
Source: Corrugated Stainless Steel Tubing, read 2026-11-09
Make the gas-line bids describe the same installation
- State the fuel: natural gas or propane, and the appliances the line will serve.
- Describe the indoor, exposed and buried portions separately.
- Name the exact material, tubing system and compatible fittings.
- For CSST, request the product identification, current instructions and bonding details.
- For PE, list the locally required burial, tracer and metallic riser transition.
- For copper, confirm the tubing specification and suitability for the gas supplied.
- Record the product operating limits separately from the proposed gas supply conditions.
- Identify inspection access and the maintenance plan for customer-owned buried piping.
Sources
- Gas Piping Material — local utility engineering guide — Hawaii Gas; undated; read 2026-11-09.
- Gastite and FlashShield+ Design and Installation Guide, January 2020 — Gastite; 2020-01; read 2026-11-09.
- Corrugated Stainless Steel Tubing — SoCalGas; undated; read 2026-11-09.
- Customer-Owned Pipes — Frequently Asked Questions — Peoples Gas; undated; read 2026-11-09.
- Pipeline Awareness — leak indicators — Peoples Gas; undated; read 2026-11-09.
- 2024 IRC, current publisher version V2.1, Chapter 24 — International Code Council; 2024 edition; current publisher version V2.1; read 2026-11-09.
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