Durable Pressure Gauge Syphons by Samvay Fluid Tekniks Inc.
Protecting your pressure instrumentation from high-temperature media like steam is critical for both safety and measurement accuracy.
Samvay Fluid Tekniks Inc. offers a complete line of Syphons (also known as Pigtails, Coils, Gauge Siphons, Pigtail Siphons, or Condensate Chambers) designed to create a reliable condensate barrier between hot process media and the sensitive components of your pressure gauges, switches, transmitters, and other pressure-sensing instruments.
Product Overview
A syphon works on a simple yet highly effective principle: it traps condensate (liquid) in its coiled or looped section. This pool of liquid acts as a physical barrier, preventing live steam or hot gases from directly contacting the gauge internals.
How It Works:
- During system start-up, steam enters the syphon and begins to condense
- Condensate collects in the lower portion of the loop or coil
- The trapped liquid column prevents further steam from reaching the gauge
- Pressure is transmitted hydraulically through the liquid column
- The gauge reads accurately without exposure to high temperatures
Additionally, the coiled design provides a secondary benefit: it dampens pressure pulsations and surges, providing a steadier reading and protecting against mechanical shock and vibration.
Why Syphons Are Essential:
| Problem | Consequence | Solution |
|---|---|---|
| High Temperature | Gauges rated for 140°F (60°C) maximum; steam at 300°F+ destroys internals | Syphon creates cool condensate barrier |
| Thermal Expansion | Internal components expand, causing zero shift and calibration errors | Isolates gauge from thermal cycling |
| Pressure Spikes | Water hammer and surges damage delicate bourdon tubes | Coiled design dampens pulsations |
| Steam Impingement | Direct steam jet erodes internal mechanism | Condensate absorbs kinetic energy |
| Rapid Cycling | Fatigue failure from thermal/ pressure cycles | Smooths out pressure variations |
Key Features & Benefits
| Feature | Technical Benefit | Operational Benefit |
|---|---|---|
| Creates Condensate Barrier | Prevents thermal damage to instruments | Extends gauge life 3-5x |
| Multiple Configurations | Pigtail, Coil, U-Type for any installation | Fits tight spaces, any orientation |
| Dampens Pressure Spikes | Reduces gauge flutter and wear | Steady readings, less maintenance |
| Compact Design | Small footprint for crowded panels | Easy installation in existing systems |
| Material Options | SS304, SS316, CS, Monel, Hastelloy | Compatible with all process fluids |
| Pre-Fill Port | Optional port for initial water fill | Easy commissioning, especially for superheated steam |
| ASME/ ASTM Compliance | Manufactured to international standards | Quality assured, code compliant |
| Full Traceability | Material certifications with every unit | Audit-ready documentation |
Technical Specifications
| Specification | Details |
|---|---|
| Material of Construction | SS304, SS316/L, Carbon Steel (A106 Gr B), Monel 400, Hastelloy C276, Inconel 600/625, Duplex, Titanium |
| Connection Size | 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″ NPT / BSP |
| Connection Type | Male x Male, Male x Female, Female x Female, Male x Flange, Female x Flange |
| Pressure Rating | Standard: Up to 3200 PSI (220 Bar); High-pressure: Up to 6000 PSI (414 Bar); Special: Up to 10,000 PSI |
| Temperature Rating | Standard: Up to 750°F (400°C); High-temp: Up to 1200°F (650°C) with appropriate materials |
| Tube Schedule | Sch 40, Sch 80, Sch 160, XXS, or custom |
| Design Types | Coil (Q-Type), Pigtail (C-Type), U-Type (180°), Trumpet Type, Custom configurations |
| Surface Finish | Mill finish, pickled, passivated, electropolished, painted |
| Pre-Fill Provision | Optional 1/4″ or 1/2″ port with plug for initial water fill |
| Drain Provision | Optional drain valve for removal of condensate |
| Identification | Material stamp, pressure rating, and batch number |
| Certification | EN 10204 3.1 Material Test Certificate standard |
Complete Product Range
By Design Type:
| Type | Description | Best Application | Dampening Effect |
|---|---|---|---|
| Coil Type (Q-Type) | Multiple helical coils (typically 3-5 turns) | Maximum condensate volume, best dampening | Excellent |
| Pigtail Type (C-Type) | Single 360° loop, compact | General steam service, tight spaces | Good |
| U-Type (180°) | Simple U-bend, lowest profile | Low-pressure, space-limited, vertical lines | Moderate |
| Trumpet Type | Conical expansion design | High-pressure, quick condensate formation | Good |
| Double Loop | Two complete loops | Extra dampening, critical instruments | Superior |
| Extended Neck | Long straight section before coil | Hot services, radiation cooling | Good |
| Custom | Engineered to your specifications | Special requirements | Varies |
By Connection Configuration:
| Configuration | Description | Typical Use |
|---|---|---|
| Male x Male | Both ends male threaded | Direct gauge mounting on vertical lines |
| Male x Female | One male, one female end | Gauge mounts into female, syphon into process |
| Female x Female | Both ends female | Used with separate adapters, flexible mounting |
| Male x Flange | One end male, one end flanged | Large process connections |
| Female x Flange | One end female, one end flanged | Large process with adapter |
| With Fill Port | Additional 1/4″ port on top | Easy commissioning, superheated steam |
| With Drain | Additional drain at bottom | Condensate removal, freeze protection |
| With Bleed | Small vent for air removal | Precision applications |
By Material:
| Material | Grade | Max Temperature | Application |
|---|---|---|---|
| Carbon Steel | ASTM A106 Gr B | 800°F (427°C) | General steam, non-corrosive, economical |
| Stainless Steel 304 | AISI 304 | 1200°F (649°C) | General purpose, food, water |
| Stainless Steel 316 | AISI 316 | 1200°F (649°C) | Chemical, marine, pharmaceutical |
| Stainless Steel 316L | AISI 316L | 1200°F (649°C) | Welded construction, pharmaceutical |
| Stainless Steel 321 | AISI 321 | 1500°F (816°C) | High temperature, welding |
| Stainless Steel 347 | AISI 347 | 1500°F (816°C) | High temperature, nuclear |
| Monel | Monel 400 | 1000°F (538°C) | Hydrofluoric acid, seawater |
| Hastelloy | C276 | 1000°F (538°C) | Extreme chemical resistance |
| Inconel | 600/625 | 1800°F (982°C) | Very high temperature |
| Duplex | 2205 | 600°F (315°C) | High chloride, sour service |
By Pressure Rating:
| Schedule | Pressure Rating (SS316 @ 100°F) | Typical Application |
|---|---|---|
| Sch 40 | 2,500 PSI | General steam, low-pressure |
| Sch 80 | 5,000 PSI | Medium-pressure steam |
| Sch 160 | 8,000 PSI | High-pressure steam |
| XXS | 10,000+ PSI | Very high-pressure, supercritical |
By Size:
| Connection Size | Tube OD | Coil Diameter | Overall Height |
|---|---|---|---|
| 1/4″ | 0.54″ (13.7mm) | 2.0″ (50mm) | 3.5″ (89mm) |
| 1/2″ | 0.84″ (21.3mm) | 3.0″ (76mm) | 4.5″ (114mm) |
| 3/4″ | 1.05″ (26.7mm) | 3.5″ (89mm) | 5.5″ (140mm) |
| 1″ | 1.32″ (33.5mm) | 4.0″ (102mm) | 6.5″ (165mm) |
Quality & Compliance
Material Quality:
| Parameter | Standard / Test |
|---|---|
| Raw Material Sourcing | Prime mills |
| Material Certification | Mill Test Certificate per EN 10204 3.1 |
| Chemical Composition | Spectro analysis verification |
| Mechanical Properties | Tensile, yield, elongation testing |
| PMI Testing | Positive Material Identification (optional) |
| Hardness Testing | For sour service compliance |
| Grain Size | ASTM E112 (for high-temp applications) |
Dimensional Quality:
| Parameter | Standard / Test |
|---|---|
| Thread Accuracy | ASME B1.20.1 (NPT) or ISO 228 (BSP) gauges |
| Bend Radius | Minimum 3x tube diameter |
| Wall Thinning | <15% at outer bend radius |
| Ovality | <5% deformation |
| Concentricity | Within 0.030″ |
| Surface Finish | Free from cracks, wrinkles, or tool marks |
Performance Testing:
| Test | Method | Acceptance Criteria |
|---|---|---|
| Pneumatic Test | 150 PSI air under water | Zero bubbles |
| Hydrostatic Test | 1.5x working pressure | No leakage, no permanent deformation |
| Helium Leak Test | Mass spectrometer | < 1 x 10⁻⁶ mbar·L/s (optional) |
| Pressure Cycle | 0 to rated pressure, 10,000 cycles | No failure, no leakage |
| Temperature Cycle | Ambient to rated temp, 100 cycles | No distortion, no leakage |
| Burst Test | Sample destructive test | 4x working pressure minimum |
Certifications & Compliance:
| Certification | Applicability |
|---|---|
| ISO 9001:2015 | Quality management system |
| EN 10204 3.1 | Material traceability |
| ASME B31.1 | Power piping |
| ASME B31.3 | Process piping |
| ASTM A269 / A312 | Seamless tube specifications |
| NACE MR0175 / ISO 15156 | Sour service (optional) |
Installation Guidelines
Proper Installation Steps:
- Choose Location: Install as close to process tapping as possible
- Check Orientation: Ensure proper orientation for condensate collection
- Fill with Water: Before installation, fill syphon with water (critical step!)
- Apply Sealant: PTFE tape or pipe dope on male threads (except first thread)
- Install Syphon: Thread into process connection, hand tight + 1-2 turns
- Mount Gauge: Install pressure gauge into syphon top connection
- Check for Leaks: Pressurize system and check all connections
- Bleed Air: If equipped, open vent to remove trapped air
Orientation Guidelines:
| Syphon Type | Vertical Pipe | Horizontal Pipe | Preferred |
|---|---|---|---|
| Coil Type | Works well | Works well | Either |
| Pigtail Type | Works well | Works well | Either |
| U-Type | Works well | Not recommended | Vertical only |
| Trumpet Type | Works well | Works well | Either |
General Rule: The condensate trap (lowest point) must be below the gauge connection.
Filling Procedure (Critical):
For steam service, syphons must be filled with water BEFORE exposure to steam:
- For standard syphons: Remove gauge, pour water into top until it overflows, replace gauge
- For syphons with fill port: Open plug, fill with water until full, replace plug
- For in-situ filling: Use a small pump or syringe to inject water
Why this is critical: Empty syphon allows steam to reach gauge instantly, causing thermal shock and potential failure before condensate forms.
Common Mistakes to Avoid:
| Mistake | Consequence | Prevention |
|---|---|---|
| Not filling with water | Thermal shock, gauge failure | Always pre-fill before use |
| Wrong orientation | No condensate trap, steam reaches gauge | Follow orientation guidelines |
| Upside-down installation | Trap at top, no protection | Ensure trap is at bottom |
| Overtightening | Thread damage, stress cracking | Hand tight + 1-2 turns max |
| Wrong material | Corrosion, premature failure | Verify chemical compatibility |
| No thread sealant | Leaks at connections | Use PTFE tape or pipe dope |
| Mounting too far from tapping | Slow response, condensation in line | Install as close as possible |
Torque Recommendations:
| Connection Size | NPT (ft-lbs) | BSP (ft-lbs) |
|---|---|---|
| 1/4″ | 12-15 | 10-12 |
| 3/8″ | 18-22 | 15-18 |
| 1/2″ | 25-30 | 22-25 |
| 3/4″ | 35-40 | 30-35 |
| 1″ | 45-50 | 40-45 |
Selection Guide
By Steam Pressure:
| Steam Pressure | Recommended Syphon Type | Material | Schedule |
|---|---|---|---|
| <150 PSI | Pigtail or U-Type | CS or SS304 | Sch 40 |
| 150-600 PSI | Coil or Pigtail | SS316 | Sch 80 |
| 600-1500 PSI | Coil (multiple turns) | SS316 | Sch 160 |
| >1500 PSI | Heavy-duty coil | SS316 or Alloy | XXS |
By Application:
| Application | Syphon Type | Material | Special Features |
|---|---|---|---|
| Steam Boilers | Coil or Pigtail | SS316 | Pre-fill port recommended |
| Steam Jackets | Pigtail | CS or SS304 | Standard |
| Autoclaves | Coil | SS316 | High-pressure design |
| Sterilizers | Pigtail | SS304 | Food-grade seals |
| Heat Exchangers | Coil | SS316 | Corrosion-resistant |
| Turbine Steam | Heavy coil | SS321 | High-temperature |
| Cryogenic Service | Extended neck | SS304 | Cold service design |
| Sour Service | Coil | SS316/Duplex | NACE compliant |
By Available Space:
| Space Constraint | Recommended Type | Height Required |
|---|---|---|
| Very Limited | U-Type | 3-4 inches |
| Limited | Pigtail | 4-5 inches |
| Moderate | Small Coil (3 turns) | 5-6 inches |
| Ample | Full Coil (5 turns) | 6-8 inches |
Global Export Destinations
Samvay syphons are specified by engineers globally to protect critical instrumentation. We export regularly to:
North America:
| Country | Key Industries | Ports of Entry |
|---|---|---|
| USA | Power, Chemical, Refining | Houston, New York, Los Angeles |
| Canada | Oil Sands, Power, Mining | Vancouver, Montreal, Toronto |
| Mexico | Refining, Power | Veracruz, Altamira |
Europe:
| Country | Key Industries | Ports of Entry |
|---|---|---|
| Germany | Chemical, Power | Hamburg, Bremerhaven |
| United Kingdom | Power, Chemical | Felixstowe, Immingham |
| Netherlands | Refining, Chemical | Rotterdam |
| France | Nuclear, Chemical | Le Havre, Marseille |
| Italy | Refining, Power | Genoa, Naples |
| Spain | Refining, Power | Barcelona, Bilbao |
Middle East:
| Country | Key Industries | Ports of Entry |
|---|---|---|
| UAE | Oil & Gas, Petrochemical | Jebel Ali |
| Saudi Arabia | Oil & Gas, Petrochemical | Dammam, Jubail |
| Qatar | Oil & Gas, LNG | Mesaieed, Ras Laffan |
| Kuwait | Oil & Gas | Shuwaikh |
Asia Pacific:
| Country | Key Industries | Ports of Entry |
|---|---|---|
| Singapore | Refining, Petrochemical | Singapore Port |
| Malaysia | Oil & Gas, Power | Port Klang, Kuantan |
| Indonesia | Oil & Gas, Power | Jakarta, Surabaya |
| Thailand | Petrochemical, Power | Laem Chabang |
| South Korea | Refining, Power | Busan, Ulsan |
| Japan | Power, Refining | Tokyo, Yokohama |
| Australia | Power, LNG | Sydney, Melbourne, Perth |
| India | Power, Refining, Chemical | Mumbai, Chennai, Kandla |
Africa:
| Country | Key Industries | Ports of Entry |
|---|---|---|
| South Africa | Power, Mining | Durban, Richards Bay |
| Nigeria | Oil & Gas | Lagos, Port Harcourt |
| Egypt | Oil & Gas, Power | Alexandria, Port Said |
Industry Applications
Power Generation:
| Application | Syphon Type | Material | Special Requirements |
|---|---|---|---|
| Boiler Steam Drums | Coil or Pigtail | SS316 | High-pressure, pre-fill port |
| Superheater Outlets | Heavy-duty coil | SS321 | High-temperature |
| Turbine Inlet Steam | Coil | SS316 | Critical accuracy |
| Feedwater Heaters | Pigtail | SS304 | Standard |
| Deaerators | U-Type | CS | Economical |
| Auxiliary Boilers | Pigtail | SS304 | General service |
Oil & Gas:
| Application | Syphon Type | Material | Special Requirements |
|---|---|---|---|
| Steam Injection Wells | Heavy coil | SS316 | NACE MR0175, high-pressure |
| Refinery Steam Lines | Coil | SS316 | Fire-safe, high-temp |
| Offshore Platforms | Coil | Duplex | Saltwater resistant, compact |
| Gas Processing | Pigtail | SS304 | Low-temp possible |
| Petrochemical Plants | Coil | SS316 | Chemical resistant |
Chemical Processing:
| Application | Syphon Type | Material | Special Requirements |
|---|---|---|---|
| Reactor Heating | Coil | SS316 or Hastelloy | Corrosion resistant |
| Distillation Columns | Pigtail | SS316 | Standard |
| Heat Transfer Systems | Coil | SS304 | High-temperature oils |
| Acid Plants | Coil | Hastelloy | Acid resistant |
Food & Beverage:
| Application | Syphon Type | Material | Special Requirements |
|---|---|---|---|
| Retorts | Coil | SS316L | FDA seals, hygienic |
| Cookers | Pigtail | SS304 | Food-grade |
| Sterilizers | Pigtail | SS304 | Sanitary connections |
| Evaporators | Coil | SS316L | Electropolished |
Pharmaceutical:
| Application | Syphon Type | Material | Special Requirements |
|---|---|---|---|
| Autoclaves | Coil | SS316L | USP Class VI, electropolished |
| Pure Steam | Coil | SS316L | Sanitary, drainable |
| WFI Systems | Pigtail | SS316L | Ultra-clean |
Comparison: Syphon Types
| Parameter | Coil Type | Pigtail Type | U-Type |
|---|---|---|---|
| Condensate Volume | High (50-100 ml) | Medium (20-40 ml) | Low (10-20 ml) |
| Dampening Effect | Excellent | Good | Moderate |
| Space Required | Moderate | Compact | Minimal |
| Cost | Moderate | Low | Very Low |
| Pressure Rating | Up to 6000 PSI | Up to 6000 PSI | Up to 3000 PSI |
| Best For | Critical service, high-pressure | General purpose | Low-pressure, tight spaces |
Why Choose Samvay Fluid Tekniks Inc.?
1. Quality Materials:
We use only prime quality seamless pipes from certified mills, ensuring:
- No weld seams in bend area that could fail under thermal stress
- Consistent wall thickness throughout
- Full material traceability
2. Precision Manufacturing:
- CNC bending for consistent geometry
- No wrinkling or buckling in bends
- Precise thread machining
- 100% dimensional inspection
3. Full Testing:
- 100% pressure testing
- 100% thread gaging
- Material certifications with every order
- NDT options available
4. Application Expertise:
- Right syphon type for your service
- Correct material for your fluid
- Proper size for your connection
5. Global Supply:
- Export packaging for safe delivery
- Door-to-door shipping options
- Full export documentation
- Tracking provided
6. Competitive Pricing:
- No middlemen markups
- Volume discounts
- Annual contract options
Ordering Information
How to Specify Your Syphon:
- Type Required: Coil, Pigtail, U-Type, or Custom
- Connection Size: 1/4″, 1/2″, 3/4″, 1″, etc.
- Connection Type: Male-Male, Male-Female, etc.
- Thread Standard: NPT or BSP
- Material: SS304, SS316, CS, Monel, etc.
- Pressure Rating: Operating pressure
- Temperature: Operating temperature
- Special Requirements: Pre-fill port, drain, certifications
Part Numbering System:
SF-SY-□□-□□□-□□□-M□□
| Code | Meaning | Options |
|---|---|---|
| SF | Samvay Fluid | – |
| SY | Syphon | – |
| □□ | Type | CO(Coil), PI(Pigtail), UT(U-Type) |
| □□□ | Connection Size | 04(1/4″), 06(3/8″), 08(1/2″), 12(3/4″), 16(1″) |
| □□□ | Material | 304(SS304), 316(SS316), CS(Carbon), MO(Monel), HA(Hastelloy) |
| M□□ | Thread | NPT(NPT), BSP(BSP) |
Example: SF-SY-CO-08-316-NPT = Coil Type, 1/2″ SS316 Syphon with NPT Threads
Request a Quote
Protect your valuable pressure instruments with Samvay syphons.
Contact Information:
📧 Email: syphons@samvayglobal.com
🌐 Website: www.samvayglobal.com
📞 Phone: +91 [Your Phone Number]
📍 Address: [Your Full Address]
For Quick Quotation:
Please provide:
- Syphon type and quantity
- Connection size and thread
- Material required
- Pressure and temperature
- Any special requirements