IOGP & JIP33, S-612 Air Compressor : 7 Accessories (2/4)

7 Accessories
7.1 Drivers
7.1.1 General
7.1.1.5
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The driver nameplate rating, exclusive of the service factor, shall be at least 110 % of the maximum power required for all of the specified operating conditions.

7.1.2 Electric Motors
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7.1.2.1
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7.1.2.1.1
Motors shall conform to either IEC 60034, NEMA MG-1 or IEEE 841, unless otherwise specified in the motor data sheet.
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7.1.2.1.2
Enclosure for main driver motors shall be totally enclosed fan cooled (TEFC), totally enclosed air to air cooled (TEAAC) or totally enclosed water to air cooled (TEWAC).
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7.1.2.1.3
For general outdoor environments, motors shall have, as a minimum, weather protection class IP55.
For environments with areas exposed to powerful water jets and deluge or offshore open deck, IP56 weather protection class shall be used, as a minimum.
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7.1.2.1.4
Motor shall be supplied with a minimum of Class F insulation.
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7.1.2.1.5
Motor shall be suitable for direct on line starting, unless otherwise specified in the data sheet.
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7.1.2.1.6
Main driver motor shall be provided with stator winding anti-condensation type space heater. The space heater shall remain energized when the motor is not running.
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7.1.2.1.7
Motors with sleeve bearings shall be equipped with one x and one y radial proximity probes per bearing.
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7.1.2.1.8
Lube oil for motors equipped with sleeve bearings shall be fed through the common pressurized lube oil system as used by the compressor and gearing.
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7.1.2.1.9
Motor equipped with sleeve bearings shall have one dual element resistance temperature detector per bearing.
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7.1.2.1.10
Medium voltage motors shall have two embedded 3-wire PT100 resistance temperature detectors for windings per each phase of stator windings.
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7.1.2.1.11
For a vendor supplied local control panel, bearing and winding resistance temperature detectors shall be connected to a local controller.
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7.1.2.3 Electric Motor Testing
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7.1.2.3.1
Routine tests are not required for low-voltage motors which are already type tested to an approved standard, such as IEC 60034-1:2017, 9.1
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7.1.2.3.2
For medium voltage motors, the following minimum testing shall be performed by the motor manufacturer:
a. No load test (measurement of no-load characteristics, losses and determination of locked-rotor current)
b. Measurement of stator-winding resistance
c. Insulation resistance test of stator winding
d. Determination of efficiency for 50 %, 75 % and 100 % rated load
e. Vibration measurement at bearing housings
f. Phase sequence, direction of rotation, terminal marking
g. Noise test.

7.2 Couplings and Guards
7.2.1 Couplings
7.2.1.1 Replace second sentence with
The flexible elements shall be corrosion-resistant alloy. Coated flexible elements shall not be used.
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Unless otherwise specified in the data sheet, coupling and guard design and manufacture shall conform to ISO 14691.
7.2.1.2
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Main drive coupling spacer shall be 200 mm (8 in.) length minimum.
7.2.1.7
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The coupling-to-shaft juncture shall be designed to transmit power at least equal to the power rating of the coupling including any service factor and any transient operating conditions.
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7.2.1.8
The coupling assembly shall be dynamically balanced to Grade 2.5 as per ISO 21940-11.
7.3 Baseplate/Support Structure
7.3.2
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7.3.2.1
Baseplate shall be provided with a drain connection of DN 50 (NPS 2).
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7.3.2.2
All welding shall be continuous.
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7.3.2.3
Design code for baseplate lifting lugs shall be specified in the data sheet.
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7.3.2.4
For off-shore installation of skid, additional certifications for lifting lugs and lifting beams shall be specified by the purchaser.
7.3.4
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Baseplate structural members provided for supporting the compressor, gear and driver shall be in full contact with the foundation or grout to ensure direct transmission of dynamic forces to the foundation or support beneath the baseplate.
7.3.10
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The driver mounting plates shall be furnished with axial and lateral jackscrews the same size as or larger than the vertical jackscrews.

7.4 Controls and Instrumentation
7.4.1 General
7.4.1.2
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Unless otherwise specified, controls and instrumentation shall be designed for outdoor installation and meet the requirements of IP65 or NEMA 4X.

Instrumentation and control systems shall be designed for continuous operation at the specified ambient temperature without any degradation of the measurement and control accuracy specified by the manufacturer.

7.4.1.4
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The microprocessor shall be capable of communication with the purchaser’s distributed control system (DCS).
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7.4.1.4.1
The local control panel shall have a communication interface with the purchaser’s control system, as specified in the data sheet, via a high integrity ethernet communication link for remote operation and control, data monitoring and retrieval.
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7.4.1.4.2
Any interface between the vendor’s local control panel and the purchaser’s safety instrument system shall be through hard-wired signal interface.
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7.4.1.7
The vendor supplied local control panel shall have provision for:
a. Remote start and stop of compressor
b. Remote and local read-out of vibration data.

7.4.2 Control Systems
7.4.2.1 Replace section with
Unless otherwise specified in the data sheet, capacity modulation with variable inlet guide vane shall be provided. Add new section
7.4.2.3.1
When surge control and detection is based on monitoring motor current as the primary monitoring signal, an additional secondary monitoring signal based on process conditions (discharge pressure or flow) shall be provided, if specified by the purchaser in the data sheet.
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7.4.2.7
If specified by the purchaser, complete control system or parts thereof (anti-surge controller, performance controller, vibration monitoring) may be integrated into the purchaser’s control system. For such cases, the vendor shall provide suitable termination in junction boxes or skid edge remote input and output cabinet for interface to the purchaser’s cable.
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7.4.2.7.1
All field analogue instruments such as transmitters and control valves shall be provided with a suitable communication protocol, as defined in the data sheet, to facilitate effective communication, remote monitoring and diagnostics from the purchaser’s control system.
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7.4.2.7.2
The vendor shall provide control narrative and control algorithm which will be required by the purchaser to develop control logic and system control documentation for implementation in the purchaser’s control system.

The control narrative and control algorithm shall include:
a. List of network interface
b. Cause and effect
c. Logic drawing
d. Hardwired signal list.
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7.4.2.9 Parallel Operation
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7.4.2.9.1
For systems comprising of more than one compressor unit, a load-sharing controller for parallel operation of the units shall be provided and integrated into the compressor control panel.
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7.4.2.9.2
Automatic start of standby compressor in case failure of duty compressor shall be provided and integrated into the compressor control panel.

7.4.3 Instrument and Control Panels
7.4.3.1
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When provision of a local control system is included in the vendor’s scope, a panel from which startup and shutdown can be accomplished shall be provided and shall include the following:
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r. Ammeter for the electric motor.

7.4.4 Instrumentation
7.4.4.3 Thermocouples and Resistance Temperature Detectors
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If specified in the data sheet, bearing metal temperature sensors shall be provided for hydrodynamic bearings. 7.4.4.5 Vibration and Position Detectors
7.4.4.5.1
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a. Radial vibration probes as per 7.4.4.5.2.1;
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7.4.4.5.2 Radial vibration monitoring
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7.4.4.5.2.1
One x and one y radially oriented non-contacting shaft vibration probe shall be provided for each pinion shaft bearing next to an impeller stage.
7.4.4.5.2.2
Angular orientation of probe mounting holes shall be the same for both ends of each pinion.
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7.4.4.5.3
Axial position monitoring Add new section
7.4.4.5.3.1
Axial position monitoring with two proximity probes shall be provided for thrust bearings.
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7.4.4.5.3.2
For compressors with pinion shafts using only thrust collars, axial displacement probes on pinion shaft are not required.
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7.4.4.5.3.3
Probe shall be installed to sense the shaft itself or an integral axial surface of the shaft, within an axial distance of 300 mm (12 in.) from the thrust bearing.
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7.4.4.5.4 Accelerometers
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7.4.4.5.4.1
Gear casing shall have a machined surface for mounting high frequency accelerometer in accordance with API Std 670.
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7.4.4.5.4.2
If specified in the data sheet, a high frequency accelerometer shall be supplied, installed and calibrated in accordance with API Std 670 on the machined surface of the gear casing.
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7.4.4.5.5 Vibration monitoring system
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7.4.4.5.5.1
For a vendor supplied local control panel, all vibration and position detectors shall be monitored by the compressor local control panel.
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7.4.4.5.5.2
The vendor shall state the target material for the probes.
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7.4.4.5.5.3
Vibration monitoring system shall be calibrated as per API Std 670.
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7.4.4.7 Pressure Limiting Valve and Pressure Relief Valves
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7.4.4.7.1 Relief valves shall not discharge to a location within normal operation or maintenance access areas that can impact personnel.
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7.4.4.7.2
If radial relief valves are used, they shall have a guard installed to prevent discharge impacting personnel.
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7.4.4.7.3
Calculations shall be provided for all relief valve sizes and settings, including accumulation, to verify that all possible modes of equipment failure have been taken into account.
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7.4.4.9 All pressure transmitters on the skid shall be provided with single block and bleed manifolds.
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7.4.4.10
Level gauge span shall encompass maximum and minimum operational level including high and low trip set points. Add new section
7.4.4.11
The scale on level glass or magnetic level gauges shall indicate percentage or units of length consistent with system of units used in the data sheet.
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7.4.4.12 Control valves shall be mounted with sufficient clearance around to permit servicing and disassembly without removing valve body from the line. Add new section 7.4.4.13 Mechanical switches shall be approved by the purchaser
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7.4.4.14
Instrument tubing fittings shall be of the double-ferrule type.
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7.4.4.15
Tubing fittings and fitting components shall be from a single manufacturer and not interchanged with fittings from other manufacturers.
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7.4.4.16
Discharge blow-off valves shall have stainless steel internals with soft polytetrafluoroethylene (PTFE) seat.

7.4.5 Alarms and Shutdowns
7.4.5.1 General
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f When motor equipped with sleeve bearing
g If applicable
7.4.5.3 Alarm and Shutdown Devices
7.4.5.3.4
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If specified, shutdown system shall be provided with switches or another suitable means to permit testing without shutting down the unit.

7.4.6 Electrical Systems
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7.4.6.7 Purchaser’s Interface
The vendor shall provide cable trays, conduits, transit frames etc. for routing the purchaser’s electrical power and control cables to the respective consumer on the skid. For an enclosed skid, single-point electrical interface shall be provided. For medium voltage motors a separate electrical interface shall be provided for the main driver motor.

7.5 Piping
7.5.1 General
7.5.1.2
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A manifolded cooling water piping system shall terminate with flanged single-supply and single-return connections at the edge of the package.
7.5.1.5
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Seal welding of galvanized pipe in cooling water service shall not be used.
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7.5.1.9
All utility lines such as instrument air, cooling water supply and cooling water return shall be provided with single-point tie-in connection with isolation valve located at skid edge.
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7.5.1.10
Drain lines shall be terminated to the edge of the baseplate with an isolation valve at the purchaser’s tie-in point. Add new section
7.5.1.11
All ASTM A105/A105M carbon steel flanges shall be limited to design minimum temperatures of -9.4 °C (15 °F) and warmer. For colder climates, ASTM A350/A350M Grade LF2 Class 1 material shall be used.
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7.5.1.12
All slip-on flanges shall be double welded.
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7.5.1.12
The installation of permanent in-line strainer shall permit dismantling of strainer elements without removing strainer body or housing. Add new section
7.5.1.13
If expansion joints are used in compressed air service, they shall be metallic bellows type joints.
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7.5.1.14
Compressor discharge check valves shall be of piston type or dual plate (dual disk) design and of full stainless steel construction.
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7.5.1.15
Ball valves constructed so that the ball is held in place with a threaded portion of the valve body shall not be used, unless the valve halves are positively secured together (such as sealwelding) by the valve manufacturer.
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7.5.1.16
Quarter turn block valves used for critical isolation such as isolation valves upstream and downstream of the control valve and isolation valves for safety transmitter, shall include a mechanism capable of accepting a pad lock or car seal for the purpose of locking or car-sealing the valve in its intended position.
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7.5.1.17
Valve stems and shafts for all valves (including check valves with external shafts) shall be blow-out proof if:
a. The stem or shaft becomes separated from the closure device
b. The stem nut becomes detached from the yoke
c. The packing gland is removed.
Valve stems shall be designed such that the weakest link is outside of the pressure boundary.
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7.5.1.18
Ball and butterfly valves shall have anti-static device.
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7.5.1.19
All carbon steel air and water piping shall have 1.5 mm (1/16 in.) corrosion allowance as a minimum.

7.5.2 Oil Piping
7.5.2.1
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7.5.2.4
Tubing may be used on sizes DN 15 (NPS 1/2) and smaller. Tube fittings shall be of double-ferrule type.
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7.5.4 Pipe Support
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7.5.4.1
The vendor shall provide the purchaser with the allowable load and movement at the tie-in point.
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7.5.4.2
Piping shall be designed to withstand reaction forces from pressure relief and blow-off valves.
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7.5.4.3 Bracings shall be provided for vent, drain and small-bore connections.
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7.6 Intercoolers, Aftercoolers and Other Pressure Equipment
7.6.2
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7.6.2.1
The drain valve shall be fitted at the lowest point of the cooler inclusive of moisture separator.
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7.6.2.2
Electronically operated automatic drain traps with bypass shall be provided.
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7.6.2.3
Solenoids for the drain traps, if used, shall be H-rated, with full stainless steel body and soft seal (PTFE, etc.).
7.6.3
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Alternative configuration, based on the vendor's standard proven design may be used, if approved by the purchaser. Approval shall be subject to the vendor submitting a satisfactory proposal on heat exchanger maintenance and cleaning of shell and tube side for fouling. Water on the shell side of a sea-water cooled heat exchanger is not acceptable.

7.6.5
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U-bend shall not be used unless approved by the purchaser.
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Note 1: Refer to 6.10.6.3 and Table 4 for material selection of the intercooler and aftercooler components.
7.6.6
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Refer to 6.10.6.3 and Table 4 for material selection of the air-cooled cooler.
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7.6.7
Non-integral aftercooler, oil cooler and any other fabricated pressure equipment part of the package shall be designed and constructed to the pressure design code specified in the data sheet.
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7.6.8
Integrated intercooler and aftercooler part of compressor casing or extended pressure casing shall be as per the vendor’s standard design and construction.
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7.6.9
If specified in the data sheet, vessels shall be ASME code stamped or be compliant with the essential safety requirements of the Pressure Equipment Directive (PED) 2014/68/EU.
7.7 Inlet Air Filter/Silencer
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Refer to 6.10.6.3 and Table 4 for material selection of the inlet air filter and silencer. The piping between the inlet air filter or silencer and the compressor’s air inlet flange, shall be 316 stainless steel or carbon steel with non-metallic lining or insert.
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7.7.1
If specified in the data sheet, a self-cleaning pulse-jet type inlet filtration system shall be provided.