IRD-4

Fixed insertion probe regulation for representative natural gas analyzer samples

The Welker IRD-4 Probe Regulator is a fixed insertion pressure-regulating sample probe designed to deliver representative natural gas samples to online analyzers at the proper pressure. Mounted directly to a hot tap or mating flange on a depressurized pipeline, the IRD-4 extracts gas from the center one-third of the source stream for real-time analysis. With a pressure-regulating probe tip, thermal fins, low internal volume, multiple pressure control ranges, and optional spring range kit, the IRD-4 helps reduce lag time, mitigate Joule-Thomson cooling, prevent sample condensation, and protect downstream analytical devices.

Where to Use

Natural Gas Analyzer Sampling

Upstream of an analyzer as a standalone pressure control device or part of a sample conditioning system.

Pipelines With Full Port Isolation Valves

Designed for natural gas pipelines with a full port isolation valve where manual insertion, retraction, and maintenance may be needed,

Complies With:

API 14.1 GPA 2166 ISO 10715

Resources

IRD IOM IRD Data Sheet

Fixed Insertion Length

Helps collect representative samples from the center one-third of the pipeline.

Pressure-Regulating Probe Tip With Thermal Exchange Fins

Places the regulation point in the pipeline and helps mitigate Joule-Thomson cooling and sample condensation.

Small Internal Volume

Reduces lag time to support real-time sample analysis.

Multiple Pressure Control Ranges

Adapts to the pressure requirements of different downstream analyzers.

Optional Welker Spring Range Kit

Allows operators to change the pressure control range for different applications or downstream devices.

	IRD
Materials of Construction	316/316L Stainless Steel, FKM, FFKM, PTFE
Materials of Construction	Others Available
Connections	Outlet: ¼" FNPT
Connections	Pipeline: ½", ¾", 1" or 2" MNPT
Output Range	IRD-1: 75–200 psig (5–13 barg)
	IRD-1: 75–200 psig (5–13 barg)
	IRD-2: 100–500 psig (6–34 barg)
	IRD-4: 0–25 psig (0–1.7 barg); 0–50 psig (0–3.4 barg); 20–100 psig (1.3–6 barg); or 75–200 psig (5–13 barg)
	IRD-6: 250–1500 psig (17–103 barg)
Insertion Length	2.2" Standard for 2" and 3" Pipe
	3.6" Standard for 4" and 6" Pipe
	5.9" Standard for 8", 10", and 12" Pipe
Flow Coefficient (C_v)	IRD-1, IRD-2, and IRD-6: 0.092
Flow Coefficient (C_v)	IRD-4: 0.138
Operation	IRD-1 and IRD-4: Diaphragm-Operated
Operation	IRD-1, IRD-2, and IRD-6: Piston-Operated
Operating Pressure	IRD-1, IRD-2, and IRD-6: 5000 psig @ -20 °F to 100 °F (344 barg @ -28 °C to 37 °C)
Operating Pressure	IRD-4: 3600 psig @ -20 °F to 100 °F (248 barg @ -28 °C to 37 °C)

IRD-4

Where to Use

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