SMITH FLOW CONTROL (USA)

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Smith Flow Control: Key Operated Process Control Safety Valve Systems

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Smith Flow Control (SFC) was established in 1985 to provide engineered safety solutions for hazardous operations in the oil & gas and chemical processing industries. Smith Flow Control introduced the coded-card linear-key concept in a range of modular key-operated interlocks to regulate operator execution of work procedures on any form of host process equipment. Typical applications include every form of valve (including motorised and instrument valves), switches, vessel closures, access guards, pressure and temperature sensing systems and rail/road/sea tanker loading systems.

Smith Flow Control`s solutions in hazardous processes reduce the scope for operator error and ensure safe continuous plant operation.

Most offshore installations in the North Sea have been equipped with Smith Flow Control systems as well as the majority of related onshore processing facilities throughout Europe. By 1990, Smith Flow Control became the generic term for key interlock safety systems in the international oil & gas industry and our client base now includes most of the major operating companies in all five continents.

Smith Flow Control Ltd is a British company who specialize in the field of Mechanical Valve Control Equipment.

This includes:

Mechanical Valve Interlocks

Actuated valves cannot be locked by preventing the valve from turning. Instead, the valve is locked by controlling access to the control equipment that energizes the actuator.

For pneumatic and hydraulic actuators, this is usually a small diameter valve in the air or oil supply line to the actuator. Closing and locking this valve will disable the actuator. When interlocking motor actuated valves, there are three considerations to be observed.

  1. The switch buttons can only be operated within the permitted interlock sequence.
  2. The exact position of the valve is confirmed, before progressing / proceeding*.
  3. The manual override facility is incorporated within the interlock scheme.

Wheel Operated Valves

SFC GL valve interlocks suit all types of handwheel operated valves. Including gate, globe,and gear-operated valves. They form part of a comprehensive range of process interlock safety systems.

Available with `tailor made` concentric mounted bespoke valve attachment or with universal (wheel mounted) mounted kits.

When used with other SFC interlocks, operators are compelled to follow the correct sequence of operation of all valves within the sequence.

Mechanical Principles

  • Mounting Kit (Bespoke or Universal)
  • Lock Body
  • Operating Key(s)

Lever Operated Valves

SFC QL valve interlocks suit all types of lever operated valves. Including ball, butterfly and plug valves. They form part of a comprehensive range of process interlock safety systems.

Mechanical Principles: QL Interlocks comprise 3 basic elements.

  • Bespoke Mounting Kit.
  • Lock Body.
  • Operating Keys

The key philosophy requires `code-bars` to be inside the lock body, specially chosen to accept only the correct key, which is specific to the process requirements.

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Valve Interlock Products and Flexi-Drive

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Closure Door

Access into pressure vessels is a potentially hazardous exercise. Residual pressure, volumes of residual gases or liquids can all be harmful.

Typical examples of these potential hazards include pig traps, filter housings and autoclaves.

Locking the vessel closure in the closed position with a DL3 interlock ensures access into the vessel can be achieved: only under controlled, safe conditions.

The operating key is held in a secure place, e.g. the control room or supervisors office or is retained in another interlock elsewhere in the sequence (often the vent valve lock).

In a typical system, the key can only be retrieved when the vent valve is opened, thereby reducing the pressure within the vessel. The system can be extended to include interlocks on all isolating valves and a drain valve

Key Cabinets


Having implemented a good interlock control system, the next most important step is to apply a good Key Management System.

For storage, ease of access and issue, SFC key cabinets provide all that is required.

A key cabinet should be located in a safe place; typically a control room whereby initiating keys are issued by the Shift Supervisor, Offshore Installation Manager (OIM) or other person in authority.

Cabinets vary in size and can accommodate from 1 - 227 system initiating (or spare) keys.

Lock Out - Tag Out

Introduction
Many of the valves on site require a simple to use locking device to prevent accidental or unauthorised operation. The ATL has been developed to be fitted directly to valves in place of the normal handwheel or operating lever with little machining which can easily achieved by the customer.

Construction
The ATL is available in two sizes covering all valve sizes. Available in 304 Stainless Steel for standard monitored areas offering a secure lockout tag-out device. For remote unmonitored areas a carbon steel case hardened option is available which will withstand the toughest vandalism.

Operation
With the unit fitted to the valve, the standard SFC tamper-proof coded card key can be inserted allowing valve operation. Depending of operational requirements the valve can be operated to any position, once the key has been removed the unit free wheels preventing valve operation.

Ordering
The units are available ``off the shelf`` allowing the customer to undertake the simple machining operation, thus reducing order times and offering an instant security solution.

ATL Security

Introduction
Many of the valves on site require a simple to use locking device to prevent accidental or unauthorised operation. The ATL has been developed to be fitted directly to valves in place of the normal handwheel or operating lever with little machining which can easily achieved by the customer.

Construction
The ATL is available in two sizes covering all valve sizes. Available in 304 Stainless Steel for standard monitored areas offering a secure lockout tag-out device. For remote unmonitored areas a carbon steel case hardened option is available which will withstand the toughest vandalism.

Operation
With the unit fitted to the valve, the standard SFC tamper-proof coded card key can be inserted allowing valve operation. Depending of operational requirements the valve can be operated to any position, once the key has been removed the unit free wheels preventing valve operation.

Ordering
The units are available ``off the shelf`` allowing the customer to undertake the simple machining operation, thus reducing order times and offering an instant security solution.

Flexi-Drive

Valve location a problem? ... No problem!

Flexi-Drive is a very versatile product consisting of two stations, joined by a unique patented linear drive cable.

This equipment enables valves and other wheel-operated devices in remote, hard to reach or hazardous locations to be operated easily from a conveniently located handwheel.

1. Anchor
All units must be securely anchored to a permanent fixture.

2. Valve Station Actuator
The valve station serves as the torque-producing component located at the valve end of the mechanical Remote Valve Operator system. Linear motion of the steel helix cable is converted back into a rotary motion at the valve operation.

3. Operator Station
Input torque at the operator station turns a pinion shaft that drives a cable gear. Flexi-Drive Operator stations are available in a variety of gear ratios, providing a wide range of torque capabilities. A helically wound steel cable has a pitch the same as that of the cable gear. This precision gear-cable interface provides a positive force to the helix cable, which travels through the flexible conduit to the valve station actuator.

The cable system can be passed around and through walls, bulkheads, floors and any other obst

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  • SMITH FLOW CONTROL (USA)
  • SMITH FLOW CONTROL (USA)
  • SMITH FLOW CONTROL (USA)

Products


Easi-Drive


Ellis Valve Interlocks


Flexi-Drive

Developed to operate valves in inaccessible locations, Flexi-Drive can be applied to any conventional wheel-operated valve/device, in oil, gas and chemical processing plants, or any other industrial application. It is su


Lever Operated Valves

Forming part of a comprehensive range of process interlock safety systems. Available with `tailor made` concentric mounted bespoke valve attachments. The interlocks can be fitted to the valve during live process without


Wheel Operated Valves

The interlocks can be fitted to the valve during live process without the need to shut-down the system nor does it compromise the certified pressure envelope of the system.When used with other SFC interlocks, operators a

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