Installation and Operation Manual
Argos WA - Pressure Regulating Valve
MI-44
Elaborado
Verificado / Aprovado
CSQ
Data
Revisão
Página
JJ
GN
JM
03/09/18
01
4 de 20
1.1.2 – INSTALLATION
All equipment, piping, and vessels are designed to support mechanical efforts, as, for instance, torque and bending
momentum, in addition to internal pressure. However, careful shall be exercised during installation not to develop
excessive efforts, which can cause cracks that may result in serious breakage when the regulator is put into operation.
Excessive tensions can also be caused if the equipment is overburden by piping, which should be otherwise appropriately
supported.
All regulators, shutoff valves, relief valves, etc., shall be installed taking into account the correct flow sense.
Impulse lines are important components of any control system and it is essential for them to be correctly installed
according to instructions.
Impulse lines should be appropriately supported to reduce excessive vibration, which can provoke fatigue breaks. They
should also be positioned so that they cannot serve as feet or hands supports. Impulse lines should be slightly sloping so
that liquids and condensates drain towards the main piping.
Auxiliary systems should not be changed, or modified, without knowledge of the operation conditions and permission of
the responsible in charge.
1.1.3 – OPERATION
Depending on the regulator type, its valve can be positioned fully open. Consequently, when a regulator is put into
operation, the shutoff valves should be open slowly so that the regulator valve can assume its regulating position. If the
valves are quickly opened the upstream pressure can pass downstream through the regulator and over-pressurize
downstream the main line.
All regulators, etc., should operate with the regulating spring specified by the manufacturer. This provision is particularly
important when operating relief or shutoff valves, since incorrect springs can hinder a relief valve to open and a shutoff
valve to close at the proper time.
Provisions should be taken to avoid water input through breathing and ventilation openings.
1.1.4 – MAINTENANCE
Regulators and valves contain gases at pressures that sometimes are higher than the atmospheric pressure. Before
trying to investigate any problem or to perform service maintenance of the equipment, they should be safely de-
pressurized. Besides, as most gases can be flammable, poisonous, corrosive, or somehow, dangerous, it may be
necessary to purge the installation with an inert gas, as nitrogen. Special precautions are necessary for operation with
oxygen or hydrochloric gas and the user should be reassured that appropriate procedures are implemented.
Eventually, it is not enough to isolate the high-pressure device, since high pressures can be retained downstream of
isolation valves. Do not try to remove covers, plugs, etc., before these parts are properly freed-up. Even so, it is advisable
to consider if high-pressure gas can be present at the time of removal of covers and plugs.
