The impulse tube is used to remove pressure and connect impulse lines to flow and pressure regulators. Besides this, this is another one of inexpensive options solutions for high temperatures of the measured medium. Each meter of impulse tube lowers the temperature of the medium by approximately 80 degrees. Typically steel or copper impulse tubes are used. One end of the impulse tubing, connected to the pressure source, has the most convenient thread for G1/2 mounting, and the other end, connected to the sensor or regulator, has a thread that matches the threads of the equipment.
For example: for the convenience of installing pressure sensors, the AKVA-KIP company offers an impulse tube (copper) with threaded internal and external connections of any length for supplying pressure. The copper tube can withstand pressure up to 87 bar and at the same time bends easily, which allows you to special effort And additional tool lay it in place from the pressure tapping point to the device.
Characteristics:
Copper tube: 10x1
Pressure (max): 87 bar (30 bar for threaded fittings)
Temperature: -25+210 C
Thread of connection to the process and to the device: G1/2, G1/4, G3/8 (if requested, indicate internal or external)
The price is indicated for an impulse tube 1 meter long and with a G1/2 thread.
Length: 1 meter (we accept orders for the production of tubes of any length; to calculate the cost and production time, please contact the company’s managers)
Auxiliary fittings for pressure measuring instruments include a device such as a Perkins tube, otherwise called an impulse tube for a pressure gauge or a loop tube. It is intended for reliable protection device from possible fluctuations in the measuring medium and from excessive heating. Using a tube, the temperature at the point of contact of the device with the system is lowered. In addition, the tube serves as an adapter from the pressure gauge to the pipeline.
Condensation accumulates in the cavity of the impulse tube, preventing the high-temperature medium being measured from entering the middle of the pressure gauge. When putting the line into operation, you need to make sure that there is coolant in the steel tube.
The Perkins loop tube is used to measure liquids and gases that are not strong reagents. In this capacity and as an intermediary between devices and pipelines, an impulse tube is the most cost-effective connection option. The use of such a tube can extend the life of the measuring device for many years. The optimal way to connect this type of fittings to a pipeline system is to use threaded connection. In some cases, the connection is made by welding. Impulse tubes are made from various brands high quality steel. If there is a need to install pressure sensors, then for their installation use copper tubes Perkins.
The impulse tube, which has an angular design, is used to install a measuring device on it and connect it to impulse systems. Sometimes such tubes are made of brass. Straight loop tubes are used in the same cases. General purpose This additional equipment is to dampen vibrations and pulsations in the measured medium and prevent the pressure gauge from heating up.
On the pages of the Soyuzpribor LLC online store you will find pressure tapping devices, connecting hoses, various adapters for pressure gauges, frames, dampers, bosses and other types of additional equipment.
To create normal temperature conditions, the connection of the diaphragm seal to the measuring device must be carried out either through a connecting hose or through a supply pipe, which is installed by the consumer between the pressure tapping point and the separator.
GSP pneumatic measuring pressure transducers are always connected to the separator via a sleeve.
When installing a separator with a connecting sleeve, a displacement in height is allowed; in this case, the installation error of the measuring device with an upper measurement limit of up to 1 MPa, determined by the hydraulic pressure of the column of separating liquid in the connecting sleeve, should be taken into account.
The standard connecting hose, model 55004, has a length of 2.5 meters when deployed.
The damping device is resistant to ambient temperatures from minus 55 to plus 70 °C, at relative humidity from 30 to 80% over the entire temperature range, and are also resistant to relative humidity of 95% at a temperature of 35 ° C (for version U) and relative humidity up to 100% at a temperature of 35 ° C (for version T).
Valve blocks BC are intended for connection to lines with the measured medium of instruments for measuring excess and vacuum pressure. The blocks allow you to cut off instruments from lines without releasing the pressure of the measured medium, check the zero value of instrument readings, or purge impulse lines. For lines measuring oxygen pressure, parts in contact with the medium being measured are degreased and marked “K”.
coupling and adapter for pressure gauges or thermometers are connecting (connecting) fittings used in systems (pipelines) for transporting gaseous media and liquids of low viscosity and non-crystallizing nature. At their core, these products are additional (auxiliary) equipment.
A Perkins tube (pulse tube) is designed to cool the measured medium when supplied to a measuring device (pressure gauge, pressure sensor). By using a compensating loop, a gas cushion remains in the tube and water hammer is protected. Removal measuring instruments from pipelines with hot media allows you to protect them from heating.
* It is possible to manufacture Perkins tubes of other sizes, as well as with connections according to your drawings.
Testing and measuring equipment used on pipelines and various technological devices, imposes strict requirements on the parameters of the working environment. Unnecessarily unacceptable heat, vibrations, pressure pulsations. Perkins tube, connecting the liquid or gas line with the control device, allows you to reduce the parameters of the working environment for pressure gauges to acceptable values.
The product has the shape of a loop - condensation appears in it, the high-temperature working environment does not pass to the measuring equipment. The device is effective when working with chemically non-aggressive liquids and gases. Before use, the Perkins tube is filled with cold liquid. Some models of Perkins tubes are supplemented with a shut-off valve and connecting units.
The material of manufacture is steel of various grades, the maximum operating temperature is 300 degrees, thread options are M20x1.5, G1/2. The choice of thread is carried out according to the parameters of the pipeline connecting element and the measuring device. main feature installation - the need to eliminate or minimize areas of horizontal tube placement - a certain slope towards the measuring device is recommended.
Group of companies (GK) "Teplopribor" (Teplopribory, Prompribor, Heat control, etc.)- these are instruments and automation for measuring, monitoring and regulating the parameters of technological processes (flow metering, heat control, heat metering, control of pressure, level, properties and concentration, etc.).
At the manufacturer's price, products are shipped as own production, as well as our partners - leading factories - manufacturers of instrumentation and automation equipment, control equipment, systems and equipment for control technological processes— Process control system (much is available in stock or can be manufactured and shipped in the shortest possible time).
Perkins loop tube
Perkins tube is a steel loop impulse tube, designed for installation, protection of the device and pressure tapping of non-aggressive liquids, gases and steam. Perkins tube (loop impulse tube) is used for guard control and measuring device (pressure gauge, sensor) from strong heat— overheating (by cooling the measured medium in a siphon), as well as for damping water hammer(due to the compensating loop of the siphon, damping the pulsation of the hydraulic shock). Perkins loop impulse tubes (straight and angled siphon bends) are the most economical option for protection and connection of pressure measuring instruments on all types of pipelines.
Pulse Loop Perkins Tube Cost depends on the material design, type of thread, etc.,
for example, the price of the basic version (straight, Steel 20, welded bottom) - from 295 rubles*
Main technical characteristics of Perkens loop impulse tubes
Design:
- direct(for installation on a horizontal pipeline)
- angular(for installation on a vertical pipeline)
corners without a shoulder, with a shoulder towards the loop or away from the loop.
Nominal working pressure:
for St.20 up to 250bar (25MPa),
for 12Х18Н10Т (stainless steel) up to 40MPa.
Maximum operating temperature up to 300C.
Diameter: impulse tube 14x2 mm, loop - usually 85 mm (the most common length is 360 mm).
Types of Perkins connection to the process / device:
- internal / external W-Z thread(nut/fitting)
– internal / internal W-W thread(nut/nut)
— welding / thread (inside/outside)
Execution for welding is possible with or without reinforcement.
Thread type: pipe inch G1/2 or metric M20x1.5.
Material:
structural steel St.20 (painted or with anti-corrosion electroplated up to 200C), steel 09G2S or stainless steel 12Х18Н10Т (up to 450С).
In the case when the temperature of the working medium exceeds 90 0 C, an impulse tube with a loop (siphon design) is used. Thanks to the use of a compensating loop, the devices are protected from pulsations of the measured medium, water hammer and overheating. Depending on the location of the pipeline, a straight or angular Perkins design is selected.
Loop pulse (siphon) Perkins tubes are usually made of steel: St.20, 09G2S, 12Х18Н10Т, 12Х1МФ, 10Х17Н13М2Т. Options for connecting to the device: fitting/nut with different threads - M20x1.5; G1/2; NPT1/2; K1/2; R1/2 and others. Options for connecting to the process: welded, reinforced welded, fitting/nut with various threads - M20x1.5; G1/2; NPT1/2; K1/2; R1/2 and others.
The effectiveness of using a siphon device to control steam pressure is ensured by the effect of condensation of cooled steam in the bends of the siphon.
Additional Information
Pressure sampling device– this is a mounting element with the help of which instrumentation and automation equipment is connected to pipelines, gas ducts, air ducts, technological equipment, communications, etc.
The simplest pressure sampling device is an assembly of a siphon impulse tube with a shut-off device (tap, valve or valve).
Auxiliary equipment and protective and installation fittings for installation, correct operation and protection of pressure monitoring devices (pressure gauges, vacuum gauges, pressure and vacuum gauges, sensor-relays, converters and others.).
Installation and supply fittings for pressure gauges, vacuum gauges and pressure-vacuum gauges:
1. Mounting fittings: selecting devices - OU: bosses (welded adapters), straight and angled bends (including Perkens loop tubes) or impulse tubes (lines) copper and steel.
2. Pressure gauge valves (up to 16/25 bar) or valves/valve blocks (over 2.5 MPa), pressure and safety valves.
3. Gaskets/seals made of copper, fluoroplastic, paranitic, rubber, etc.
4. Adapters M20/12 - G1/2/G1/4 (outer/ internal thread), couplings, barrels (material steel, brass, stainless steel).
5. KMCH – a set of mounting parts (usually: mounting flange (rear or front), bracket, bracket, fasteners).
6. KPC – a set of connecting parts (usually: flanges, fittings, nuts-M20x1.5/G1/2, nipples (steel, stainless steel), fasteners, seals).
Protective separation devices:
1. Protective devices: dampers (pulsation absorbers of water hammer, skid), coolers (radiator taps), membrane separators RM, capillary lines and connecting hoses mod-55004.
2. Protective covers. Installation in special insulating, fireproof, moisture-proof cabinets and covers, use of special equipment. heaters.
Spare parts and accessories - spare parts:
1. Operating pressure indicator (arrow).
2. Liquids for filling the “Device-Membrane Separator-Connecting Sleeve” system; the type of liquid is selected depending on the temperature and type of controlled environment (for example, for food production, etc.).
3. Spare parts and accessories - spare parts and accessories (mechanisms, hands, dial/scales, etc.).
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Official website of Teplopribor Group of Companies - production and sale of instrumentation and automation equipment: Pressure control devices (pressure transducers (sensors), relays, pressure gauges, differential pressure gauges, pressure meters), additional equipment and installation and shut-off valves for them (sampling devices, impulse tubes (lines), taps/ valves, etc.). See technical description/specifications, price list ( Wholesale price), catalog, order form (how to choose, order and buy), selected devices, etc. Perkens at manufacturer's price, check availability in warehouse in Moscow or production time. Delivery/shipment TC ( Business Line and others) throughout the Russian Federation.
Price: from 295 rub.
Availability in stock: In stock*
* Perkins loop (siphon) impulse tubes (straight or angular) are available at the warehouse in Moscow only in the standard (basic) version; If special designs are not available, the planned production time will be 10-15 working days, or inexpensive analogues available in stock can be offered.
All prices for loop (siphon) impulse Perkins tubes (straight or angular) are indicated in rubles (see general price list) excluding tax (VAT = 18%), additional cost. options and equipment, packaging, shipping and/or delivery costs, based on a wholesale order (for large wholesale quantities and for project orders, the price is formed individually, based on the volume of the batch, agreements reached and the address of the facility).
ATTENTION! Be careful when choosing a supplier - on Russian market shut-off and control valves and selected pressure devices there are cheap low-quality Perkins loop impulse tubes: analogues, counterfeits and illiquid goods, deprived of proper service and warranty; therefore, perhaps even having a lower price than the original products.