JUNTA ADMINISTRATIVA DEL REGISTRO NACIONAL REGISTRO DE LA PROPIEDAD INDUSTRIAL

10.22.1 Specification For Field Instruments

(a) Pressure Indicators

Direct reading, pipe mounted Pressure gauges of aluminum casing (epoxy coated) with 4 and ½ inch phenolic dial (white dial with black numerals), 316 SS Bourbon tube, AISI 304 movements and micrometer type adjustable aluminum pointer an accuracy of +0.5% of span including accessories like, snubbers for pump discharge applications and name plate, etc., Material of accessories will be SS. IP65 or equivalent degree of protection for enclosure. Over range protection will be 50% above maximum pressure. Armoured capillary of 15M shall be provided as required.

(b) Pressure Switches

Non indicating type, field mounted Pressure Switches of aluminum casing (epoxy coated), and 316 SS element and accuracy of +1 % of span, including accessories like syphons for steam services., snubbers for pump disscharge applications and chemical diaphragm for corrosive and oil services, name plate& mounting brackets. Material of accessories will be SS. Auto reset micro switch with internal adjustment for set values with 2 SPDT contacts rated for 0.02 A at 220 V DC. IP 65 or equivalent degree of protection for enclosure. Over range protection 50% above maximum pressure. Scale for setting shall be provided.

(c) Thermometers

Indicating type, field system with ten (10) meters SS capillary with SS armour and six (6) inch dial (white dial with black numerals with micrometer pointer) housed in aluminum casing (epoxy coated) with an accuracy of +1% of span, response time for 2-4 seconds, auto temperature calibration, liner calibration over the range and SS bulb with 316 SS thermowell having a process connection of M33 x 2 thread or 150 RF flanged. Material of accessories (name plates, mounting brackets, etc.) will be SS. IP 65 or equivalent degree protection for enclosure. The Thermowell shall bewith Hex head bar

stock assembly. The thermowell construction shall meet the ANSI 19.3 – 1994 (latest ) requirements.

(d) Thermowells

Pipe /equipment mounted temperature thermowells shall be 316 SS with a process connection of M33x 2 thread or 150 RF flanged. Accessories like name plate, plug with chain, etc. shall be provided. Material of accessories will be SS. Thermowell shall be hex head of bar stock assembly. In case flanged wells are required for any specific application, the same shall be supplied as required. The thermowell construction shall meet the ANSI 19.3 – 1994 (latest) requirements.

(e) Flow indicating switch

Vane / paddle type water detector, with switched output with time delay. Pneumatically controlled mechanical delay mechanism . 2 nos. switch contacts rated for 10A , 240 VAC, 2.5 A, 24 VDC.

(f) Junction Boxes

Wall / column mounted MS junction boxes having screwed terminal and bottom cable entry single lockable door removable gland plated IP 54 or equivalent degree of protection for enclosure. Separate terminal blocks shall be used for analog and digital signals and also signals with different voltage. Shield bus, terminal size suitable for 0.5 sq. mm to 2.5 sq.mm wire, accessories like SS metal tag, clamps, bolts, nuts gaskets, lock and key, fire proof compound for sealing.

(g) Interposing Relay (IPR)

Electro magnetic type IPR s with plug – in type connections, suitable for channel / rail mounting in cabinets : coil rating 24V DC or 110 V AC 2 set of change over contacts rated for 0.2A 220V DC. Free wheeling diode across relay coil and self reset type status indicator flag (electronic) shall be provided.

(h) Local Panels

Indoor / located, free standing vertical type panels with 3mm thick sheet material of cold rold steel: antivibration pads of 15 mm thick ; fluorescent lighting; Double doors at every 1.5 m; blower in each section with brass mesh; fire proof compound for sealing cable entry ; fire detector for each section; space heater for each section (strip type). IP

65 degree of protection for enclosure. Adequate support and mounting arrangement for instruments, adequate support & clamping for wires and cables , adequate maintenance space, annunciation windows to be located centrally.

(i) Solenoid valves

Direct operated solenoid valves with shut of class (leakage) , body rating ANSI 150 material of SS 304 plunger material of 316 SS, rated for continuous duty. IP 65 equivalent protection class for enclosure insulation class of ‘F’ for the solenoid, moulded type of coil, single/ dual coil.

(j) Wiring, Termination and Accessories

i. Instrument wires : wires carrying 4-20 mA DC or any other low voltage or current signals. Used for panel internal wiring, tinned copper conductor of 0.5 sq.mm. cross section with seven strand and twisted pair with 20 twists/meter. Insulation material shall be PVC, heat resistant with flame retarding properties with thickness not more than 0.5 mm and voltage grade will be 1100 V.

ii. Control wires used for power supply like 110V AC , 240V AC 220V DC, + 24Vetc. Used for panel internal wiring, tinned copper conductor of 1.5 sq.mm cross section with seven strands. Insulation material shall be PVC , heat resistant with flame retarding properties, voltage grade will be 1100 V.

iii. Terminal block(TB) : Screwed type, 600 grade, vertically mounted, size of 0.5 sq.mm to 1.5 sq. mm for instrument wires and 1.5 s. mm to 2.5 sq. mm for control wires. Clearance between TB’s will be 150mm and between TB and bottom plate be 250mm, flame resistant, non- hygroscopic, de-carbonised. Insulation between adjacent terminals or between terminals & frame work will be 2kV RMS for 1 minute – Power supply and signal TB shall be separate. Signals shall be grouped in TB’s in the same order as that in junction box so as to provide neat cable layout and wiring. High voltage and low voltage signals shall be provided on separate TB’s which are mounted separately.

iv. Termination details: Maximum of 2 wires shall be terminated per terminal Wiring raceways, straps shall be flame retardant. All wiring shall be ferruled. Wires carrying power and signals wires shall be routed in separate raceways. Accessories like MCB, cable support, fuses, etc., shall be supplied. Cable entries shall be cemented with fire proof compound.

Integral architecture, solid state electronics, ISA sequence ring back R-2 response time of less than 50 milliseconds, adjustable time delay for each point. In rush current limiter for driving circuits, plug in type PCB with gold plated contacts, LED’ s in input/output modules, logic cards and power supply cards for fault indication. Design for maximum ambient temperature of 50deg. C and relative humidity 95% system can accept potential free NO or NC contacts, with conversion from normally open to normally closed contacts possible at site. Contact interrogation voltage 24V DC contact bounce protection, fuse protection, fuse failure fuse detection, power supply failure and module failure monitoring for input modules. Translucent back it annunciation windows mounted on control desk. Two lamps in parallel for each window. Hotter for main supply failure, buzzer for alarm occurrence and chime for return back to normal. Test and earth test. Replacement of cards on power on condition.

(l) Illuminated push buttons (lLBP)

i. Rectangular, twin block per assembly, One block for START/OPEN and second block for STOP/CLOSE operation; 2 lamps/block, one additional lamp for discrepancy indication per assembly, 2 NO + 2NC contacts with 5A 230V AC rating , 110 V AC/24V DC lamp rating, 3watts, series resistance for lamps, colour red/green amber.

ii. Same single block with one lamp for forward /reverse/stop operation. (m) Push button (PB)

Rectangler, single block, Momentary contact type with engraved inscription plates, 2 NO+ 2NC contacts with 5A , 230V AC rating, colour red/green /amber.

9.23. Spares

9.23.1 Startup spares shall be as required.

9.23.2 Essential spares shall be supplied as detailed below:

(a) For field instruments, air filter regulators, E/P converter and junction box and drive modules a minimum of one (1) no. or 10% of the quantity each type and range, whichever is higher . shall be provided.

(b) Control panel

10% of each type, or minimum one(1) no., whichever is higher shall be supplied for the following

i) Fuses of each type and rating. ii) MCB of each type.

iii) Terminals of each type.

iv) Male & female parts of pre-fabricates Cables –6 nos. , of each type. (c) Wiring, Termination & Accessories.

10% of each type, or minimum one(1) no., whichever is higher shall be supplied for the following

i) Fuses of each type and rating

ii) Miniature circuit breaker of each type & rating. iii) Terminals of each type.

iv) Space heater with thermostatic controls. v) Fire detectors.

vi) Blower.

vii) Cable clamps each type.

viii) Male & female pre- fabricated cables – 6 nos. each type. ix) Spare terminal in each terminal block in all cabinets.

x) Spare space for counting additional terminal blocks in all cabinets. xi) Wiring raceways to accommodate additional 30% space of total quantity.