gas line safety valve free sample

Swissfluid SIV Inline Sampling Valves are installed directly in the pipeline or in a bypass piping system. Collecting a liquid sample with our cavity-free design results in a representative sample taken directly from the media flowing through the pipeline.

In connection with a closed Piston Injector also gases can be sampled besides liquids, without coming in contact with the atmosphere or with the operator. Our sampling valves and –systems are the preferred choice for applications in the chemical, pharmaceutical and refining industries, and are suitable for piping systems with flange connections per ASME B16.5 or DIN standard EN 1092, with face-to-face dimensions per ASME B16.10 or EN 558-1, range 1. Compact wafer connections, typically with a face-to-face length of 62mm (2.44in), are also available. Our SIV Sampling valves are designed for ANSI 150lbs, 300lbs and 600lbs systems, or in accordance with DIN PN16/40/64.

OPEN sampling from valves, container, reactors, etc. in the open position, into vessels without technical safety measures, or CLOSED sampling, where the product is taken from a closed system, without exposure to the person taking the sample or the atmosphere.

Alternatively, gases as well as liquids can be transferred into our Piston Injector. Its stainless steel - protected borosilicate glass enclosure allows for visual control during sample collection.

Sampling Valve bodies and spindles are available unlined from 1.4408 / 1.4404 stainless steel, or fully lined with PFA or PFA-AS (anti-static) in order to protect against highly corrosive or aggressive media. For ultimate corrosion protection, our SIV Sampling Valves are also available in exotic metals such as Titanium, Inconel or Hastelloy.

We offer our Sampling Ball Valve with CF-8M SS body (AISI 316) fluorothermoplastic-lined, or in an unlined version using the same body material. This volume-specific sampler draws a pre-determined volume – including minimal sample sizes - from horizontal and vertical piping systems. The collected sample and the main line are not connected after sampling, eliminating any system pressure being transferred, which also allows vacuum sampling. Full-port construction and close attachment of the sampling unit eliminate any dead space, which allows easy cleaning and purging of the piping system. Thanks to the large sample opening very high as well as very low viscosity samples can be taken.

This easy to operate Inline Sampling Ball Valve is suitable for clear, liquid media, within operating conditions of -40°F – 400°F and pressures up to 232psi.

Optional equipment to satisfy specific customer requirements include heating jackets, butt-weld ends or clamp connections. In order to create hermetically sealed sampling, we also offer safety cabinets, needle adapters and activated carbon filters.

WITT is a manufacturer of Pressure relief valvesor Safety relief valves for technical gases. They are designed to protect against overpressure by discharging pressurized gases and vapors from pipelines, pressure vessels and plant components. Safety relief valves (SRV) are often the last line of defense against explosion – and such an explosion could be fatal. Other common names for safety relief valves are pressure relief valve (PRV), safety valve, pressure safety valve, overpressure valve, relief valve or blow-off valve.

WITT safety valves are very precise. They are individually preset to open at a predetermined pressure within the range 0.07 to 652 Psi. Their small size and orientation-independent installation allow a wide range of connection options. WITT relief valves also stand out due to their high blow-off flow rates of up to 970m³/h. They can be used within a temperature range of -76° F to +518°F and even with very low pressures.

For maximum safety, WITT undertakes 100 % testing of each safety relief valve before it is delivered. In addition, WITT offers individual testing of eachsafety valveby the TÜV, with their certificate as proof of the correct set pressure.

WITTsafety relief valvesare direct-acting, spring-loaded valves. When the preset opening pressure is reached, a spring-loaded element in the valve gives way and opens, and the pressure is relieved. Once the pressures are equalized, the valve closes automatically and can be reactivated any time the pressure rises again. Depending on the application and the nature of the gas, the safety relief valvescan either discharge to atmosphere, or via a connected blow-off line. The opening pressure of the safety valves is preset by WITT at the factory according to the customer’s requirements.

Safety relief valvesare used in numerous industries and industrial applications where, for example, gases pass through pipelines or where special process vessels have to be filled with gas at a certain pressure.

These include, among other things:Pipeline, plant and container constructionIndustrial furnace constructionInsulators and reactors (e.g. “glovebox” systems)hydrogen-powered vehiclesAdditive manufacturing (3D printer)

For most industrial applications using technical gases, brass is usually the standard material of construction of thesafety relief valvebody/housing. For the use of pressure relief valves with aggressive and corrosive gases, the housings are made of high-quality stainless steel (1.4541/AISI 321, 1.4404/AISI 316L, 1.4305/AISI 303 or 1.4571/AISI 316Ti). The use of aluminium as a housing material is also possible.

Depending on the type of gas used and individual customer requirements, various sealing materials and elastomers are available to ensure the safety of your systems under even the most difficult conditions.

WITT pressure relief valves are available with different connections. In addition to the standard versions with the usual internal or external threads, special versions with KF or CF flanges, VCR or UNF threads can also be ordered. Special adapters for connecting the safety relief valve to a blow-off line are also available.

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Valves for industrial applicationsIn order to prevent the uncontrolled rise in pressure in pressure vessels or pressurized pipelines, a safety valve is inserted. The safety valve is designed so that it opens at a given maximum pressure, thereby relieving the line or the container. Safety valves find their use in almost all areas of the pressure vessel and pipeline construction. In cryogenics as a spring-loaded safety valve for example.

The primary purpose of a safety valve is to protect life, property and the environment. Safety valves are designed to open and release excess pressure from vessels or equipment and then close again.

The function of safety valves differs depending on the load or main type of the valve. The main types of safety valves are spring-loaded, weight-loaded and controlled safety valves.

Regardless of the type or load, safety valves are set to a specific set pressure at which the medium is discharged in a controlled manner, thus preventing overpressure of the equipment. In dependence of several parameters such as the contained medium, the set pressure is individual for each safety application.

In order to ensure that the maximum allowable accumulation pressure of any system or apparatus protected by a safety valve is never exceeded, careful consideration of the safety valve’s position in the system has to be made. As there is such a wide range of applications, there is no absolute rule as to where the valve should be positioned and therefore, every application needs to be treated separately.

A common steam application for a safety valve is to protect process equipment supplied from a pressure reducing station. Two possible arrangements are shown in Figure 9.3.3.

The safety valve can be fitted within the pressure reducing station itself, that is, before the downstream stop valve, as in Figure 9.3.3 (a), or further downstream, nearer the apparatus as in Figure 9.3.3 (b). Fitting the safety valve before the downstream stop valve has the following advantages:

• The safety valve can be tested in-line by shutting down the downstream stop valve without the chance of downstream apparatus being over pressurised, should the safety valve fail under test.

• When setting the PRV under no-load conditions, the operation of the safety valve can be observed, as this condition is most likely to cause ‘simmer’. If this should occur, the PRV pressure can be adjusted to below the safety valve reseat pressure.

Indeed, a separate safety valve may have to be fitted on the inlet to each downstream piece of apparatus, when the PRV supplies several such pieces of apparatus.

• If supplying one piece of apparatus, which has a MAWP pressure less than the PRV supply pressure, the apparatus must be fitted with a safety valve, preferably close-coupled to its steam inlet connection.

• If a PRV is supplying more than one apparatus and the MAWP of any item is less than the PRV supply pressure, either the PRV station must be fitted with a safety valve set at the lowest possible MAWP of the connected apparatus, or each item of affected apparatus must be fitted with a safety valve.

• The safety valve must be located so that the pressure cannot accumulate in the apparatus viaanother route, for example, from a separate steam line or a bypass line.

It could be argued that every installation deserves special consideration when it comes to safety, but the following applications and situations are a little unusual and worth considering:

• Fire - Any pressure vessel should be protected from overpressure in the event of fire. Although a safety valve mounted for operational protection may also offer protection under fire conditions,such cases require special consideration, which is beyond the scope of this text.

• Exothermic applications - These must be fitted with a safety valve close-coupled to the apparatus steam inlet or the body direct. No alternative applies.

• Safety valves used as warning devices - Sometimes, safety valves are fitted to systems as warning devices. They are not required to relieve fault loads but to warn of pressures increasing above normal working pressures for operational reasons only. In these instances, safety valves are set at the warning pressure and only need to be of minimum size. If there is any danger of systems fitted with such a safety valve exceeding their maximum allowable working pressure, they must be protected by additional safety valves in the usual way.

In order to illustrate the importance of the positioning of a safety valve, consider an automatic pump trap (see Block 14) used to remove condensate from a heating vessel. The automatic pump trap (APT), incorporates a mechanical type pump, which uses the motive force of steam to pump the condensate through the return system. The position of the safety valve will depend on the MAWP of the APT and its required motive inlet pressure.

This arrangement is suitable if the pump-trap motive pressure is less than 1.6 bar g (safety valve set pressure of 2 bar g less 0.3 bar blowdown and a 0.1 bar shut-off margin). Since the MAWP of both the APT and the vessel are greater than the safety valve set pressure, a single safety valve would provide suitable protection for the system.

Here, two separate PRV stations are used each with its own safety valve. If the APT internals failed and steam at 4 bar g passed through the APT and into the vessel, safety valve ‘A’ would relieve this pressure and protect the vessel. Safety valve ‘B’ would not lift as the pressure in the APT is still acceptable and below its set pressure.

It should be noted that safety valve ‘A’ is positioned on the downstream side of the temperature control valve; this is done for both safety and operational reasons:

Operation - There is less chance of safety valve ‘A’ simmering during operation in this position,as the pressure is typically lower after the control valve than before it.

Also, note that if the MAWP of the pump-trap were greater than the pressure upstream of PRV ‘A’, it would be permissible to omit safety valve ‘B’ from the system, but safety valve ‘A’ must be sized to take into account the total fault flow through PRV ‘B’ as well as through PRV ‘A’.

A pharmaceutical factory has twelve jacketed pans on the same production floor, all rated with the same MAWP. Where would the safety valve be positioned?

One solution would be to install a safety valve on the inlet to each pan (Figure 9.3.6). In this instance, each safety valve would have to be sized to pass the entire load, in case the PRV failed open whilst the other eleven pans were shut down.

If additional apparatus with a lower MAWP than the pans (for example, a shell and tube heat exchanger) were to be included in the system, it would be necessary to fit an additional safety valve. This safety valve would be set to an appropriate lower set pressure and sized to pass the fault flow through the temperature control valve (see Figure 9.3.8).

​Seismic shut-off valves are a simple, but effective way to ensure you never experience a gas fire after an earthquake. They are designed for earthquakes, accidents and any event of impact. We have installed thousands of automatic gas shut off valves to the manufacture’s specification to ensure safe, trouble free use.

The seismic valves work on a simple, consistent and accurate principle. A sensor moves when the valve is subjected to a 5.4 magnitude or larger earthquake, releasing the valve float which blocks the line and prevents gas going in to the building. The valve is then manually reset once a safety inspection has been done and you’re sure there are no leaks in the building.

Each valve is tested and certified before leaving the factory to meet approval from the State Board of Architect and LA Counties stringent requirements. They are tested to ASCE 25-97, State of California 12-23-1 & ANSI Z21.70-1981 Standards for Seismic Gas Valves.

Some cities and counties in California have regulations that require the installation of automatic gas shut-off devices, which may include excess flow gas shut-off valves and/or seismic gas shut-off valves. Regulations vary, but generally apply to new building construction, or significant alterations or additions to existing buildings.

If a customer installs an automatic gas shut-off valve, it should be one that is certified by the State of California and it should be installed by a licensed plumbing contractor in accordance to the manufacturers instructions.PG&Edoes not install or service seismic actuated or excess flow gas shut-off valves, or recommend specific contractors for customer applications.

​Non-emergency shut-offs will occur if the automatic gas shut-off is not installed according to manufacturer’s specifications. For example, the impact of heavy vehicles can trigger a non-emergency shut-off. They operate on movement and shut off the supply of gas to a building, when triggered by a 5.4 magnitude or larger Earthquake.

In rare cases, careless excavation work can damage the natural gas lines that serve you. For added protection, installing an Excess Flow Valve (EFV) can shut off the flow of natural gas automatically if the line is damaged or broken. EFVs are not designed to shut off the flow of natural gas for low volume leaks or a faulty appliance.

EFVs are only for services with an operating pressure greater than 10 psig and a total service load of 1,000 SCFH or less. Customer services where an EFV may be installed must be free of contaminants that could interfere with the operation of the device and where the device will not interfere with operation and maintenance activities of customer equipment and appliances. If these conditions are present, an EFV may be installed on your natural gas service line.

EFV installation normally requires the excavation of the natural gas service line at the connection to the main, and a brief service interruption. Following the installation, we will relight your appliances and restore the excavation site. If you would like an EFV installed, we can schedule the work at your convenience.

Industrial equipment often uses either safety or relief valves to prevent damaging pressure levels from building up. Though they perform similar functions, there are some critical differences between safety and relief valves. Understanding these two valves’ differences is essential for proper pressure system operation. So here we discuss the pressure safety valve vs pressure relief valve.

A pressure relief valve is a device that releases pressure from a system. The relief valve is generally immune to the effects of back pressure and must be periodically stripped down. Pressure relief valves are one the essential parts of a pressure system to prevent system failures. They are set to open at a predetermined pressure level. Each pressure system has a setpoint that is a predetermined limit. The setpoint determines when the valve will open and prevents overpressure.

Pressure relief valves are typically used in gas or liquid systems where there is a need to prevent excessive pressure from building up. When the pressure in the system reaches a certain level, the valve will open and release the pressure. Pressure relief valves are an essential safety feature in many designs and can help to prevent damage to the system or components.

PRVs are generally considered to be safe and reliable devices. However, before installing a PRV in a system, some potential disadvantages should be considered. Here are five pros and cons of pressure relief valves:

Pressure relief valves are anessential safety feature in many systems. They protect against over-pressurization by relieving excess pressure from the system. This can help to prevent severe damage or even explosions.

Pressure relief valves can help to improve the efficiency of a system. The system can operate at lower overall pressure by relieving excess pressure and saving energy.

Pressure relief valves can be used as a safety device in systems that are susceptible to overpressurization. By relieving pressure before it builds up to a dangerous level, they can help to prevent accidents and injuries.

Pressure relief valves can be a potential source of leaks. If not properly maintained, the valve may not seat properly and can allow fluids or gasses to escape.

Pressure relief valves can sometimes cause problems if they do not open or close properly. This can lead to process disruptions and may cause safety issues.

A pressure safety valve is a device used to release pressure from a system that has exceeded its design limit. This safety valve is a fail-safe device. This type of valve is typically used in systems that contain fluids or gasses under high pressure. Pressure safety valves are designed to open and release pressure when the system has exceeded its maximum pressure limit. This helps to prevent the system from rupturing or exploding.

Pressure safety valves are an essential part of many different types of systems and can help keep both people and property safe. If anyone is ever in a situation where they need to release pressure from a system, it is essential to know how to use a pressure safety valve correctly.

A pressure safety valve (PSV) is a type used to relieve a system’s pressure. PSVs are commonly used in chemical and process industries, as well as in some kinds of pressure vessels. There are both advantages and disadvantages to using a PSV. Some of the pros of using a PSV include:

A safety valve is a pressure relief device used to prevent the over-pressurization of a system. On the other hand, a relief valve is a device used to relieve pressure from a system that is already overpressurized.

The function of a pressure relief valve is to protect a system or component from excess pressure. A safety valve, on the other hand, is designed to protect from overpressurization. Both types of valves are used in various industries, but each has unique benefits and drawbacks.

Pressure relief valves are typically used in systems where a small amount of overpressure can cause damage. On the other hand, safety valves are designed for systems where overpressurization could be catastrophic. Both valves have advantages and disadvantages, so choosing the right type of valve for the specific application is essential.

Relief valves are usually set to open at a specific pressure and will close once the pressure has been relieved. Safety valves are similar in that they are also used to protect equipment from excessive pressure. However, safety valves are designed to stay open until they are manually closed. This is because safety valves are typically used in applications where it is not safe to have a closed valve, such as in a gas line.

Two types of valves are commonly used in industrial settings: relief valves and safety valves. Both of these valves serve essential functions, but they operate in different ways.

Relief valves are designed to relieve pressure build-up in a system. They open when the system pressure reaches a certain point, which allows excess pressure to be released. On the other hand, safety valves are designed to prevent accidents by preventing system pressure from getting too high. They open when the system pressure reaches a certain point, which allows excess pressure to be released before an accident can occur.

So, which valve is better? That depends on the situation. A relief valve is the better option to protect the system from pressure build-up. If anyone need to protect the system from accidents, then a safety valve is the better option

The relief valve is made to open when it reaches a specific pressure, commonly described as a “setpoint”. Setpoints shouldn’t be misinterpreted as the pressure set. A setpoint on a relief valve is set to the lowest possible pressure rating, which means it is set to the lowest system pressure before an overpressure situation is observed. The valve will open as the pressure increases to a point higher than the setpoint. The setting point is determined as pounds per square inch (PSIG) and should be within the maximum allowed operating pressure (MAWP) limits. In safety valves, the setpoint is typically placed at about 3 percent over the working pressure level, whereas relief valves are determined at 10 percent.

No, the safety valve and relief valve can not be used interchangeably. Though both valves are seal butterfly valve and used for safety purposes, they serve different functions. A safety valve relieves excess pressure that builds up in a system, while a relief valve regulates the pressure in a system.

Knowing the difference between these two types of valves is essential, as using the wrong valve for the intended purpose can potentially be dangerous. If unsure which type of valve to use, it is always best to consult with a professional.

A few key points help us understand the safety valve vs pressure relief valve. Safety valves are designed to relieve pressure in a system when it gets too high, while relief valves are designed to relieve pressure when it gets too low. Safety valves are usually set to open at a specific pressure, while relief valves are generally open at a particular vacuum. Safety valves are typically intended for one-time use, while relief valves can be used multiple times. Choose the trusted valve manufactureraccording to the specific business needs.

Color coding valve tags is an important form of visual communication. When followed properly, employees will be able to identify what type of fluid or gas will come out of a valve when it is opened at just a glance. Even if there is no other information available on the valve tag, the color will provide enough to make a decision on whether the valve should be opened in most cases.

The above-mentioned standards are among the most common used in industries today. In most cases, however, the ANSI/ASME standards aren’t actually mandatory. Companies follow them because they are proven to help improve safety and having the same standards as other facilities makes it easier for everyone to understand what the colors mean. If these specific colors don’t make sense in your situation, it is permissible to come up with a set of standards followed in the facility as long all employees are aware of it.

As a design engineer responsible for developing and specifying boilers, dryers, furnaces, heaters, ovens and other industrial heating equipment, you face a daunting labyrinth of standards and industry regulations. Regulatory bodies sound a bit like alphabet soup, with acronyms like UL, FM, CSA, UR, AGA, ASME, ANSI, IRI, CE and NFPA tossed about. This article will help explain a common task for many thermal processing equipment specifiers: meeting the requirements of key codes — including Underwriters Laboratories (UL), Factory Mutual Insurers (FM) and the National Fire Protection Association (NFPA) — for safety valve equipment used in process heating applications.

Key to designing safety into your fuel train configurations are familiar technologies such as safety shutoff valves and vent valves as well as visual-indication mechanisms and proof-of-closure switches.

Your design skills come into play with how you take advantage of the wide range of products available. You can mix and match solenoid and safety shutoff valves — within designs from catalytic reactors to multi-zone furnaces — to create easily installed, cost-effective solutions that comply with all necessary standards. (See table.)

Make sure, however, that you start with a good grasp of valve element fundamentals. For example, examining a proof-of-closure (POC) switch underlines how reliably modern valves can ensure combustion safety. The POC unit provides an electrical contact interlocked with the controller safety circuit. In a typical design, the switch is located at the bottom of the valve, positioned to trace the stroke of the valve disc. When the disc seal reaches the fully closed position, it triggers the mechanism to push down on the contact, closing it and triggering the unit’s visual indicator to show open or closed status. As a result, the operator can act with full confidence in situations where it is critical that a safety valve be safely closed.

To provide ease of installation, many users prefer valves with modular capabilities. For example, to reduce mounting complexity, you can choose modular gas safety shut-off valves — combining a solenoid valve with an electrohydraulic motorized valve for a compact double-valve footprint, a slow-open feature and high flow rates. An accompanying actuator can provide on/off or high/low/off firing rates as well as visual indication and proof of closure for compliance with most industry standards.

Also, you may want to look for valves that include useful features such as pipe taps, which can facilitate accurate pressure readings and leakage testing.

Knowing your valve choices — and how they meet given codes and standards — can reduce the time required for design and production while facilitating compliance. This results in safer, more efficient and cost-effective heating process installations.