TA956 family of pressure regulators

The TA956 family of pressure regulators and SSV comprises single function units, double function and triple function units.

TA-956 FAMILY

The TA956 family of pressure regulators and SSV comprises single function units, double function and triple function units. The modular design in which a single body is capable of accepting up to three separate functions with separate sensing lines, pilots actuators, internal control valves and seats is a peculiar characteristic of TA956 family.

This feature (of three optional integrated independent functions in one body) allows the best possible use of space due to an exceptionally compact configuration. The modular design allows any installed units, to be updated or upgraded during the entire lifetime of the regulator as the operating requirements or any changes in customers specifications are modified. TA956 pressure regulators are top entry design, this allow for ease and cost effective maintenance without dismantling regulator body from the line

APPLICATION

The modular design allows a wide variety of configurations to suit the most demanding applications in gas transmission, gas supply to industrial power plant, city gates, distribution utility systems, industry installations ,etc. TA956 pressure regulators and SSV are designed to be used with non corrosive and filtered natural gas. Upon request other gases and different process conditions may be acceptable with specific choice of materials. TA956 DFO+FC+SSV, FC+FC+SSV, MFO+FC+SSV are Pilot operated triple function gas pressure regulators

with built in safety shutoff valve and with diaphragm or sleeve-piston type regulator operation (fail open or fail close types) suitable for high, medium, and low pressure applications. TA956 pressure regulators are CE marked in accordance with the following standards:

• Pressure Equipment Directive (PED) 2014/68/EU

• DIN EN 334 (01 .07.2009)

• DIN EN 14382 (01.07.2009) Product Identification Number: CE-0085CO0164

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MATERIALS

TA-956 TRIPLE FUNCTION OPERATING PRINCIPLES

The description of the operating principle of regulators FC, DFO, MFO and SSV can be found in the single function unit catalogues.

TA-956 DFO+FC+SSV

This configuration utilises a fail open active regulator (diaphragm control type), a fail close Monitor (sleeve – piston type operation) and Safety Shutoff Valve

TA-956 DFO+FC+SSV+QEV

FEATURES

• Body specifically designed for high capacity with low
noise generation;
• Completely self operated using the inlet gas pressure
energy;
• Fully balanced control valve;
• Extremely high rangeability ;
• Suitable for high pressure reduction applications;
• Local position indicator with magnetic drive, no
possibility of leakage to atmosphere;
• Available with internal silencer;
• Available with Open/Close limit switch suitable for
classified area installation;
• Available with 4-20 mA position transmitter with
magnetic drive suitable for classified area installation;
• Available in double and triple function configurations
with built in monitor and/or SSV.

MONITOR USE

The TA956FC is classified as PED Category IV as a stand-alone safety accessory According to Pressure Equipment Directive (PED) 2014/68/EU.

This means that a stand-alone TA956FC is capable not only of regulating downstream pressure, but also protecting downstream piping from high pressure. When a 956FC pressure regulator is installed as a “Wide Open Monitor” it shall be equipped with a Quick Exhaust Valve (TA981QEV, TA982QEV) to retain the Category IV classification as safety accessory (to speed up the response when it comes into operation). Use of the Quick Exhaust Valve is not necessary when the monitor configuration is of the “Operating Monitor” Type

DIMENSIONS

TA-956 DFO+FC+SSV

DIMENSIONS [mm] & WEIGHT [kg] TA-956 DFO+FC+SSV

DIMENSIONS [mm] & WEIGHT [kg] TA-956 FC+FC+SSV

DIMENSIONS [mm] & WEIGHT [kg] TA-956 MFO+FC+SSV

TA-956 FC and MFO DN150 ANSI 600

TA-956 DFOCustomer: Ivalsa Project in Sipco Bangkok, Thailand+FC+SSV

SIZING

Sizing of gas pressure regulator involves establishing if the installed Cg is higher than the required Cg and if the
outlet velocity of gas at regulator outlet flange is within the required limits.
The following units shall be used in the below formulas:
• Q = Flow Rate [Sm3/h] (Reference conditions T=15°C, P=1 barg)
• Pu = Upstream Pressure [bar g]
• Pd = Downstream (Controlled) Pressure [bar g]
• Pb = Atmospheric Pressure [bar]
• d = Gas Density Relative to Air
• tu = Upstream Temperature [°C]
• DN = Regulator Outlet Nominal Diameter [mm]
• v = Gas Velocity at Outlet Flange [m/s]
• ΔP = Pressure drop across SSV [bar]
According to the ratio of inlet to outlet pressure there are two cases using different formulas.

CG TA-956 TRIPLE FUNCTION

In case of gases different from d=0.61 Natural Gas a correction factor F shall be used in the value of the Flow Rate
Q used in the above formulas.
The Flow Rate to be used shall be Q’=Q/F.
F is taken from the following table.

Gas conversion table

Velocity of gas at regulator outlet flange shall be calculated using the following formula: