Description

EMT manufactures non intrusive pig signaller for oil and gas pipelines. The CGQ-1 clamps onto the pipe without cutting, logs each pig passage on an LCD, and reports through an IP66 explosion-proof housing.

What Is a Non Intrusive Pig Signaller?

A non intrusive pig signaller manufacturer builds the clamp-on instrument that tells operators when a pipeline pig has reached a set point. EMT produces the CGQ-1, which senses the pig from outside the pipe wall and records the passage with a time stamp. Nothing penetrates the line, so no tapping, welding, or hot work is needed.

Operators rely on signallers at launcher and receiver stations, at scraper traps, and at checkpoints where a stalled pig must be located quickly. Intrusive units enter the line through a flange and a probe. Non intrusive units like the CGQ-1 mount with a ratchet strap or steel band and read the pig through the pipe wall. On live lines, that difference removes the need for a shutdown. Selecting a manufacturer therefore turns on sensing accuracy, certification, and delivery discipline rather than price alone.

 What Are the Key Parameters?

The table below lists the standard specifications of the EMT CGQ-1 non intrusive pig signaller.

Parameter	Specification
Detection principle	Ultrasonic or magnetic induction, non intrusive
Mounting	Ratchet strap or steel band, no pipe cutting
Enclosure	Explosion-proof housing, aluminium alloy outer box
Remote box material	316 stainless steel as standard, aluminium alloy on request
Ingress protection	IP66
Working temperature	-39.8 °C to 80 °C
Signal output	4-20 mA, configuration confirmed per duty
Indication	LCD showing passage time, automatic reset
Detection direction	Bidirectional
Interface size	2 in and above for the non intrusive connection
Design reference	ASME B16.5 flange practice; NACE MR 0175 wetted parts on request

Treat these values as the standard baseline. Signal configuration varies with the sensing technology and interface size you specify. Send the line size, medium, and ambient range, and we confirm the final build in writing before fabrication. Changing the remote box to aluminium alloy also requires matching internal electronics, so we quote that option only when the duty justifies it.

How the Sensor Confirms a Passage

The transducer and magnetic sensor watch the pipe wall at the mounting point. A reverse magneto-resistive circuit detects the disturbance, a balanced amplifier strengthens it, and a low-pass filter removes field noise. The trigger circuit hands the cleaned pulse to a CPU, which decides that a real pig has passed. The LCD then stamps the date and time, the remote switch reports the event, and the reset circuit clears the unit for the next run.

Where the Unit Fits Best

Fit the signaller at launcher and receiver stations, at scraper traps, and at checkpoints along long-haul lines. It suits oil, gas, and multiphase service, and the wide temperature range covers desert, tropical, and cold-climate sites. Sour service is available with NACE MR 0175 wetted parts. Offshore platforms benefit twice: the strap mount needs no hot work permit, and the loop saves an operator from walking the line after every launch. EPC contractors also bracket a stalled pig with intermediate units to shorten the search.

Why Choose EMT as Your Manufacturer?

• Direct factory supply: welding, machining, assembly, and function testing stay under one roof in Shenyang.
• The non intrusive clamp avoids cutting and hot work, so live lines keep running through installation.
• Explosion-proof IP66 housing performs from -39.8 °C to 80 °C in dust, rain, and salt air.
• Bidirectional detection with automatic reset covers frequent pigging campaigns without manual clearing.
• Material options include a 316 remote box as standard and NACE MR 0175 wetted parts for sour gas.
• Documentation is prepared for EPC review, covering drawings, material certificates, and test records.
• Spare transducers, straps, and clamp kits can be supplied with the order to protect a long campaign.

Who Is EMT and Why Trust Us?

EMT is a pipeline equipment manufacturer based in Shenyang, China, working with ASME U-Stamp capability and NACE compliant fabrication. We build pig signallers, pig launchers and receivers, quick opening closures, and chemical injection quills for EPC contractors and pipeline operators. Our engineers support selection, documentation, and after-sales service, so a project keeps moving from bid through commissioning.

Export projects across the Middle East and Asia have taught us what international buyers expect: correct paperwork, inspection support, and lead times that hold. A signaller order receives the same discipline as a full trap package, because a missed pig costs more than the instrument.

FAQ

Q: How do I confirm the right configuration for my line?
A: Send the line size, medium, ambient temperature range, required output, and any certification demands. We reply with a written specification and drawing before fabrication.

Q: Does installation require a shutdown?
A: No. The ratchet strap or steel band mounts the unit on the outside of the pipe, so the line stays in service and no hot work permit is needed.

Q: Can the signaller work on sour gas lines?
A: Yes, when ordered with NACE MR 0175 wetted parts. Tell us the service at enquiry so we select materials and testing accordingly.