LPG & LNG Testing for Composition, Purity & Regulatory Compliance
AGT Labs provides professional LPG and LNG Testing Services to verify the composition, purity, and specification conformance of liquefied petroleum and natural gases. Our Houston laboratory delivers accredited analysis supporting custody transfer, cargo release, and compliance for distributors, terminals, and import/export operations.
Use the tabs below to view the full analytical scope, parameters, and standards for each product. LPG testing covers propane and butane composition, vapor pressure, and residue. LNG testing covers sulfur and H₂S contaminant limits critical for grid injection compliance.
LPG Testing Services — Propane & Butane
Accredited composition, vapor pressure, residue, and corrosion testing for HD-5 propane, commercial butane, and autogas LPG grades per ASTM D2163, D1267, D2158, and D1838.
Accredited LPG Testing for Propane, Butane & Autogas Compliance
Our LPG Testing Services verify the quality and specification conformance of propane, butane, and LPG blends for distributors, cylinder bottlers, autogas suppliers, and petrochemical feedstock operations. Testing covers full hydrocarbon composition by GC (ASTM D2163), vapor pressure compliance, residue content, and copper strip corrosion — the four core requirements for LPG specification acceptance.
LPG Key Technical Parameters
Accredited ASTM methods covering the core LPG specification requirements for propane, butane, and blend grade verification.
HC Composition (GC)
ASTM D2163Vapor Pressure
ASTM D1267Residue on Evaporation
ASTM D2158Copper Corrosion
ASTM D1838Propylene Content
ASTM D2163Butylene Content
ASTM D2163LPG Laboratory Capabilities
Analytical Systems
Our LPG Testing Services utilize GCFID systems configured for ASTM D2163 detailed hydrocarbon composition of liquefied petroleum gases and propane/propene mixtures. Vapor pressure is measured per ASTM D1267 and residue on evaporation per ASTM D2158 gravimetrically. Copper corrosion testing per ASTM D1838 is specifically validated for pressurized LP gas streams.
Technical Support
- ISO/IEC 17025:2017 Accredited — PJLA Certificate No. L25-276
- HD-5 Propane Full Specification Testing (ASTM D1835 / GPA 2140)
- Rush Turnaround for Cargo & Terminal Release
- Propylene & Butylene Quantification for Petrochemical Feedstock
LPG Quality & Reporting
COA reports from our LPG Testing Services provide defensible documentation for HD-5 specification acceptance, custody transfer, and commercial grade verification.
- COA issued under ISO/IEC 17025:2017 accreditation (PJLA Cert. L25-276) with full ASTM method references.
- ASTM D2163 results reported as full component breakdown — propane, butane, propylene, butylene.
- Measurement uncertainty provided for vapor pressure and composition for custody transfer.
- Technical consultation for out-of-spec propylene content or vapor pressure non-conformance.
LNG Testing Services — Liquefied Natural Gas
Sulfur and H₂S contaminant analysis for LNG streams — critical for grid injection compliance, regasification terminal acceptance, and marine cargo quality documentation per ASTM D5504.
LNG Contaminant Testing for Grid Injection & Terminal Compliance
Our LNG Testing Services verify sulfur and hydrogen sulfide contaminant levels in liquefied natural gas streams to ensure compliance with pipeline injection specifications and terminal acceptance criteria. H₂S and total sulfur are the primary quality gatekeepers for LNG entering regasification facilities — elevated levels can damage infrastructure, violate grid tariff conditions, and create safety hazards.
AGT Labs performs sulfur speciation by PFPD-equipped gas chromatography per ASTM D5504, providing the precise contaminant data needed for cargo acceptance, dispute resolution, and operational compliance at import terminals and pipeline injection points.
LNG Key Technical Parameters
Targeted contaminant analysis for LNG sulfur compliance — PFPD-equipped GC providing sub-ppm sensitivity across all sulfur species.
Total Sulfur
ASTM D5504H₂S Content
ASTM D5504Carbonyl Sulfide (COS)
ASTM D5504Mercaptan Sulfur
ASTM D5504Dimethyl Sulfide
ASTM D5504Thiophene Content
ASTM D5504LNG Laboratory Capabilities
Analytical Systems
Our LNG Testing Services utilize PFPD-equipped gas chromatography per ASTM D5504, providing compound-specific sulfur speciation at sub-ppm sensitivity. ASTM D5504 covers H₂S, COS, mercaptans, sulfides, and thiophenes in a single analytical run — delivering the complete sulfur profile required for pipeline injection compliance and terminal cargo acceptance.
Technical Support
- ISO/IEC 17025:2017 Accredited — PJLA Certificate No. L25-276
- Sub-ppm H₂S Detection for Strict Pipeline Threshold Compliance
- Rush Turnaround for Marine Cargo & Terminal Release
- Full ASTM D5504 Compound-Specific Sulfur Speciation Report
LNG Quality & Reporting
COA reports from our LNG Testing Services provide complete sulfur documentation for pipeline injection compliance, terminal cargo acceptance, and commercial arbitration.
- COA issued under ISO/IEC 17025:2017 accreditation (PJLA Cert. L25-276) with full ASTM D5504 method reference.
- Full compound-class sulfur speciation — H₂S, COS, mercaptans, sulfides, and thiophenes individually quantified.
- Measurement uncertainty provided for H₂S and total sulfur results critical to pipeline injection threshold decisions.
- Technical consultation for H₂S exceedance or total sulfur non-conformance ahead of grid injection.
Industries We Serve
Delivering accredited LPG and LNG analysis across the full gas supply chain — from production and marine transport to distribution, petrochemical feedstock, and grid injection compliance.
LPG Distributors & Bottlers
HD-5 propane and commercial butane grade verification for cylinder filling, autogas supply, and industrial bulk distribution operations.
LNG Import & Regasification Terminals
H₂S and total sulfur analysis for incoming LNG cargoes to confirm pipeline injection specification compliance and terminal acceptance.
Marine & Cargo Operations
Independent LPG and LNG cargo analysis for bill of lading compliance, custody transfer documentation, and ship/shore quality matching.
Petrochemical Feedstock
Propylene and butylene content verification in LPG streams supplied as cracker feedstock to petrochemical and refining operations.
Gas Pipeline Operators
Sulfur and H₂S contaminant testing to confirm LNG and LPG compliance with gas grid injection quality tariff requirements.
Refineries & Gas Processing
Quality control for LPG production streams and NGL fractionation to meet commercial specification for downstream sale and distribution.
Sampling, Handling & Chain of Custody
Both LPG and LNG sampling require specialized pressure-rated cylinders and strict handling procedures to prevent compositional changes before analysis. All samples must be accompanied by a completed Chain of Custody form.
Download Chain of Custody FormLPG — Containers & Handling
- Use DOT-approved, pressure-rated sample cylinders — never glass for pressurized LPG streams.
- Fill cylinders to no more than 80% capacity to allow for thermal expansion during transport.
- Purge cylinders thoroughly with sample gas before final collection to avoid air contamination affecting GC composition results.
LNG — Containers & Handling
- LNG samples for ASTM D5504 sulfur analysis are collected as vapor-phase or gaseous samples using clean, inert-lined cylinders.
- Avoid sample contact with reactive metal surfaces that could adsorb H₂S and cause low-bias sulfur results.
- Record sampling pressure, temperature, and origin on the Chain of Custody form; ship via approved hazmat carrier.
Certify Your LPG & LNG with Accredited Testing Services
Need accredited LPG testing services for propane or butane grade verification, or LNG sulfur compliance analysis for your Houston terminal? Contact our technical team today for a custom quote.
Contact Technical Specialist