Description

What Is a Mechanical Type Pig Signaller?

A mechanical type pig signaller is a direct-contact device that confirms a cleaning or inspection pig has passed a fixed point on a pipeline. The mechanical type pig signaller for gas pipeline service mounts on launcher and receiver stations and at key intermediate points along the line. It gives operators a clear, power-free visual flag the moment a pig passes the trigger. The needle sits inside the bore and flips the flag when the pig touches it. Crude oil, natural gas, water, and petrochemical lines all use it for batching, dewatering, and inspection runs. Crews read the flag from a distance, so no SCADA link is needed for basic confirmation. EPC contractors and pipeline operators specify it where simple, rugged indication matters most. It works with foam pigs, spheres, steel-body pigs, and intelligent inspection tools. The device suits both onshore stations and offshore platforms under harsh, corrosive duty.

What Are the Key Parameters?

Engineers size each mechanical type pig signaller to line class, medium, and signal need. Our standard build covers 2 in ASME B16.5 flanges from Class 150 to 2500 and fits pipes DN100 and above. The intrusive needle extends 46 mm into the bore, with insert-depth adjustment for wall thickness. Materials range from PTFE-coated A105N to 316L SS, DSS, and Inconel for sour service. Every unit meets NACE MR0175, IP66, and Exd II BT4 for Zone 1 and 2 areas. We pressure-test each signaller and ship a test certificate with the order. Share your line size, pressure class, and signal type; we confirm the exact build and send drawings that match your flange drilling. As a mechanical type pig signaller manufacturer, we machine flanges and triggers in our own shop. We stock common sizes and trigger types for fast turnaround on urgent stations.

Parameter	Value
Mounting	2 in flange to ASME B16.5 (Class 150-2500)
Pressure rating	≤ 35 MPa (up to 2500#)
Temperature	-40 °C to 100 °C
Pipe size	DN100 and above
Trigger types	Bi-directional / Uni-directional
Input needle	46 mm, adjustable insert depth
Wetted parts	PTFE-coated A105N, 304/316L SS, DSS, Inconel
Protection	IP66, Exd II BT4, NACE MR0175
Switch output	DPDT / 2×SPDT, DC24V 3A-5A
Indicator	Manual-reset flag; flag + electrical (optional)

How Does the  Pig Signaller Work?

EMT’s mechanical type pig signaller works by direct physical contact inside the pipe. The intrusive trigger extends through the flange into the flow path. When a pig passes, it pushes the trigger aside. A torsion spring rotates the flag 90 degrees from horizontal to upright as clear visual proof. Electrical versions also send a dry-contact signal to the control room for remote alarms. The operator resets the flag by hand before the next run. No dynamic seals touch the product, so leakage risk stays low. Magnetic and bi-directional triggers detect pigs in either flow direction without false trips. The crew tunes insert depth during install to match wall thickness and medium. Routine checks need only a visual flag reset, which keeps site labor low and avoids electronic diagnostics. This simple mechanism delivers reliable pig passage detection at every monitored point.

Why Choose the Mechanical  Pig Signaller?

Buyers choose our mechanical type pig signaller for rugged, power-free indication in harsh sites.

• A manual-reset flag confirms pig passage with no electricity, battery, or wiring.
• The intrusive trigger gives direct contact, so detection stays reliable in noise-heavy plants.
• IP66 and Exd II BT4 ratings allow safe use in Zone 1 and 2 hazardous areas.
• Bi-directional and uni-directional triggers fit pigs traveling in either or one direction.
• PTFE-coated A105N to Inconel bodies resist sour gas, heat, and corrosion for long life.

Every build meets NACE MR0175 and ships with a pressure-test certificate for traceability. We tune insert depth and materials to your exact pipeline spec and medium. Removable bodies service under pressure, so crews swap units without stopping the line or cutting a hot tap. Volume programs and spare kits keep multi-station projects on one delivery plan and one quality record.

Why Trust Us?

As a direct mechanical type pig signaller supplier, EMT is a pipeline pigging equipment manufacturer based in Shenyang, China, operating since 2004. Our ASME U Stamp certifies pressure-vessel production to international codes and standards. In-house CNC machining centers, automatic welding stations, and a hydrostatic test bay control quality from raw stock to finished unit. We hydro-test every product and enclose a test certificate with each shipment for full traceability. Pipeline operators, EPC contractors, and maintenance teams in 30-plus countries run our equipment daily. We understand project timelines and offer expedited delivery when outages are tight. Our engineers reply in English, Spanish, Russian, or Chinese within four working hours. Beyond this signaller, we make QOC quick-opening closures, corrosion monitoring systems, chemical injection quills, and cleaning pigs. We deliver turnkey pigging solutions from design to commissioning. As a single-source supplier, we cover your full pigging system under one contract.