34 Samss 514 PDF
34 Samss 514 PDF
34 Samss 514 PDF
1 Scope............................................................. 2
2 Conflicts and Deviations................................. 2
3 References..................................................... 2
4 General Requirements................................... 3
5 Technical Requirements................................. 5
6 Performance Tests......................................... 8
7 Other Miscellaneous Requirements............... 9
1 Scope
2.1 Any conflicts between this specification and other applicable Saudi Aramco
Materials System Specifications (SAMSSs), Engineering Standards (SAESs),
Standard Drawings (SASDs), or industry standards, codes, and forms shall be
resolved in writing by the Company or Buyer Representative through the
Manager, Process & Control Systems Department of Saudi Aramco, Dhahran.
2.2 Direct all requests to deviate from this specification in writing to the Company or
Buyer Representative, who shall follow internal company procedure SAEP-302
and forward such requests to the Manager, Process & Control Systems
Department of Saudi Aramco, Dhahran.
3 References
Material or equipment supplied to this specification shall comply with the latest edition
of the references listed below, unless otherwise noted.
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
4 General Requirements
4.2.1 Temperature
Notes:
1) "Sheltered" refers to permanent, ventilated enclosures or buildings, or permanently
fixed sunshades with a top and three sides.
2) For instruments which dissipate internal heat and are installed in custom engineered
enclosures (e.g., enclosures not included in the original manufacturer's temperature
certification), an additional 15C shall be added to the above maximum temperatures.
An example, for "indoor air conditioned" installation, the equipment must perform at
35 + 15 = 50C. Similarly, for the "outdoor unsheltered" case, the equipment shall be
designed for a maximum operating temperature of 65 + 15 = 80C.
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
3) For the outdoor installations only, the designer can take credit for forced or passive
cooling to eliminate or reduce the 15C heat rise. For example, if vortex coolers are
used, the heat removal capacity of the coolers may be subtracted from the generated
heat. No more than 15C reduction in temperature will be given as credit. The
designer shall substantiate his claim by providing the support data and calculations.
4.2.2 Contaminants
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
4.2.3 Humidity
5 Technical Requirements
Technical requirements, shown below, together with the Standards cited in the
References and with specific information entered on the Instrument Specification Sheet
Form 8020-514-ENG, shall be followed by the Vendor in formulating a quotation or
supplying instruments.
5.1 Sensor
5.1.1.2 The vendor shall provide a list of gases and substances which
would desensitize or otherwise adversely affect the sensor.
Any effects on the sensor due to oxygen enriched or oxygen
deficient atmospheres, or high concentrations of the detected
gas, shall also be addressed.
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
5.1.3.2 Sensors shall automatically check for and alarm fouled optics
or blocked beam conditions. Fouled optics or beam blockage
shall not cause a high gas concentration indication or alarm.
5.1.3.5 Open path sensors shall determine gas concentration over the
entire path length. Gas concentration shall be expressed as
LEL-meter (percent LEL of the gas cloud multiplied by the
portion of the beam occupied by the gas cloud in meters).
5.1.4.3 For sensors or sensor components which have a finite shelf life,
the vendor shall provide storage and turnover
recommendations to the Company or Buyer Representative.
5.2 Transmitter
5.2.1 The transmitter shall be housed with the sensor in a common housing.
5.2.2 Transmitters and housings shall be certified for use in Class I, Div. 1,
Groups C and D or Class I, Zone 1, Group IIA & IIB hazardous locations
by UL, FM, CSA, or any of the agencies in the Approved IECEx
Certification Bodies (ExCBs) under the IECEx Certified Equipment
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
5.2.3 Loop voltage shall be 24 VDC nominal. Power shall be supplied by the
control unit or logic solver to which the transmitter is connected.
5.2.5 The 4-20 mA output shall correspond to 0-100% LEL combustible gas,
or 0-100 ppm hydrogen sulfide, in air.
5.2.6 Transmitters for all sensor types shall incorporate an integral, linear
analog or digital indicator for calibration, and for display of actual gas
concentrations.
5.3.2 Twenty percent spare rack capacity (slots), in addition to the required
number of channels specified on Form 8020-514-ENG shall be provided.
Blank faceplates shall cover these spare slots.
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
5.3.3 Power for the control unit chassis shall be 120/230 VAC, 60 Hz.
Power supply to the detector shall be 24 VDC.
5.3.4 Control units incorporating integral power supply modules for logic and
loop power shall have redundant modules, such that failure of a single
module does not disable the detection system.
5.3.5 Each control module shall have two single-pole, double-throw (SPDT)
relays to provide critical and warning alarm outputs, and one SPDT fault
relay.
5.3.5.3 The warning (high) alarm shall de-energize to alarm and shall be
latching or non-latching as specified on Form 8020-514-ENG.
A latching alarm shall be reset by the same pushbutton described
in Paragraph 5.3.5.2. The setpoint shall be adjustable.
The vendor shall set the warning alarm setpoint to the value
specified on Form 8020-514-ENG.
5.3.7 Indicating lamps, preferably LEDs, shall be provided on the front of each
control module for power, high-high alarm, high alarm and fault indication.
6 Performance Tests
6.1 Accuracy
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
6.1.2 The minimum accuracy for hydrogen sulfide monitors shall be 2 ppm
concentration or 10% of the applied test gas concentration, whichever
is greater.
6.2.1 The vendor shall provide a third party (UL, FM, or CSA or other Saudi
Aramco approved agencies) certificate of full compliance to ANSI/ISA-
60079-29-1 (12.13.01)-2013 for all combustible gas monitor specified on
Form 8020-514-ENG. This requirement is applicable to both catalytic
bead and point IR.
6.2.2 The vendor shall provide a third party (UL, FM, or CSA or other Saudi
Aramco approved agencies) certificate of full compliance to
ANSI/ISA-92.00.01-2010 for all hydrogen sulfide monitor specified on
Form 8020-514-ENG.
6.2.3 The vendor shall provide a third party (UL, FM, or CSA or other Saudi
Aramco approved agencies) certificate of full compliance to ANSI/ISA-
12.13.04 for all infrared open path combustible gas monitor specified on
Form 8020-514-ENG.
7.1 Marking
7.1.3 Open path combustible gas monitors shall be marked by the vendor in
accordance with ANSI/ISA-12.13.04-2007, Section 3.2, Markings.
7.2.1 The vendor shall provide the applicable instructions and data listed in
ANSI/ISA-60079-29-1 (12.13.01)-2013, Section 4.4, Instruction
Manual, for combustible gas monitoring instruments.
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Document Responsibility: Instrumentation 34-SAMSS-514
Issue Date: 26 December 2013
Next Planned Update: 26 December 2018 Combustible Gas and Hydrogen Sulfide Monitors
7.2.2 The vendor shall provide the applicable instructions and data listed in
ANSI/ISA-92.00.01-2010, Section 4.13, Instruction Manual, for
hydrogen sulfide monitoring instruments.
7.2.3 The vendor shall provide the applicable installation and operation manual
listed in ANSI/ISA-12.13.04-2007, Section 3.3, Manufacturers
Installation and Operation Manual for open path combustible gas
monitors.
7.3 Inspection
Revision Summary
26 December 2013 Major revision updating the next revision date and clarification to some references based
on recent ISA updates.
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