1 | May 6, 2019 | Proprietary © 2014 Curtiss-Wright
Farris EngineeringSeries 2600 Safety Valves
2 | May 6, 2019 | Proprietary © 2014 Curtiss-Wright
The aim of this presentation is to provide an overview of the Farris 2600 Series ASME Section VIII pressure relief valves.
3 | May 6, 2019 | Proprietary © Curtiss-Wright
Applications, References & Overview Farris’ 2600, 2600S & 2600L pressure relief
valves are used wherever safety valves according to API 526 are specified, e.g.:– Refineries– Chemical industry– Petrochemical industry– Oil and gas – Onshore and Offshore– Vessel and piping systems– Floating Production Storage and Offloading (FPSO)
4 | May 6, 2019 | Proprietary © Curtiss-Wright
AirSteamWater
Product Scope
5 | May 6, 2019 | Proprietary © Curtiss-Wright
Conventional Design
6 | May 6, 2019 | Proprietary © Curtiss-Wright
Balanced Bellows Design
7 | May 6, 2019 | Proprietary © Curtiss-Wright
BalanSeal Bellow and Balanced Piston Design
8 | May 6, 2019 | Proprietary © Curtiss-Wright
2600L Liquid and 2600S Exposed Spring Design
2600L LIQUID 2600S EXPOSED SPRING
9 | May 6, 2019 | Proprietary © Curtiss-Wright
2600 Series Restricted Lift
Full Lift Valve:Valve capacity controlled by size of the valve nozzle orifice area.
Restricted Lift Valve: Capacity controlled by the cylindrical discharge opening between the seating surfaces created when disk lifts above the seat [Curtain Area].
Valve Lift Types
10 | May 6, 2019 | Proprietary © Curtiss-Wright
2600 Series Restricted Lift Why Use Restricted Lift Valves
• Orifice areas of adjacent orifices on API type valves increase from 21% to 73%.
• Restricting lift allows you to more closely match the valves ratedcapacity to the system requirements.
• Mitigate problem of inlet pressure loss exceeding APIrecommended limit of 3% of set pressure.
11 | May 6, 2019 | Proprietary © Curtiss-Wright
2600 Series Restricted Lift
Farris Lift Restriction Method - Spacer• Does not require modification of standard internal parts to achieve lift
restriction.• Does not require use of extra wire sealing or locking mechanism like
other methods, such as use of adjustable gag screws.
12 | May 6, 2019 | Proprietary © Curtiss-Wright
2600 Series Restricted Lift
Basic Valve Requirements• Each valves actual full lift must first be verified before the lift
restriction spacer is manufactured and installed.• Valves cannot be restricted to less than 30% of the full rated lift or
0.080”. [Per ASME Code, paragraph UG-134]• Restricted lift nameplate capacity is determined by multiplying the
capacity at full rated lift by the ratio of restricted lift to the full rated lift. [Per ASME Code, paragraph UG-133]
• Spring Selections – Use standard 2600 spring charts.
13 | May 6, 2019 | Proprietary © Curtiss-Wright
2600 Series Restricted LiftMarking & TaggingType Number contains “-RL” suffix.Restricted lift value included on capacity line.Capacity listed for restricted lift value.Lift restriction spacer marked with part number and as machined height
14 | May 6, 2019 | Proprietary © Curtiss-Wright
2600 Series Restricted Lift
Approved Products
• 2600 Series - Air, gas, vapor & steam service. Current design only. National Board Certification Number 57406
• 2600L Series – Liquid service. Current design only. National Board Certification Number 57417.
• 2600L – Air, gas, vapor & steam service.• Coefficients of discharge identical to full lift designs
15 | May 6, 2019 | Proprietary © Curtiss-Wright
O-RINGS
2600 D ThroughKOrifice O-Ring
2600 L ThroughTOrifice O-Ring
16 | May 6, 2019 | Proprietary © Curtiss-Wright
Standard Materials
Item Component Standard 316 Stainless Steel High Temp (800 – 1000 F)
Material Carbon Steel AusteniticStainless Steel
Chrome Molybdenum Steel
2 Bonnet WCB CF8M WC6
5 Spring Chrome Alloy 316 St. St. high temp.,alloy steel
4 Disc 316 St. St. 316 St. St. 316 St. St.
3 Nozzle CF8M CF8M CF8M
1 Body WCB CF8M WC6
5
2
4
1
3
17 | May 6, 2019 | Proprietary © Curtiss-Wright
Materials for Corrosive Service
5
2
4
1
3
Item Component Materials for Corrosive and Low Temp Service
Material Monel Hastelloy NACE Low Temp. Carbon Steel Duplex
2 Bonnet Monel Hastelloy C WCB (NACE)CF8M (NACE)
LCBLCC
DuplexSuper Duplex
5 Spring Inconel X750 Inconel X750 Inconel X750 Chrome Alloy Inconel X750
4 Disc Monel Hastelloy C 316 St. St. (NACE) 316 St. St. Duplex
Super Duplex
3 Nozzle Monel Hastelloy C CF8M (NACE) CF8M DuplexSuper Duplex
1 Body Monel Hastelloy C WCB (NACECF8M (NACE)
LCBLCC
DupexSuper Duplex
18 | May 6, 2019 | Proprietary © Curtiss-Wright
Options
Open Lever Packed Lever Bolted Cap Balanced Bellows Test Gag
Open Bonnet O-Ring Disc Stellite SeatingSpecial
Materials/Connections Lift Indicator
19 | May 6, 2019 | Proprietary © Curtiss-Wright
Nomenclature• Example: 26DA12L-120/S4
20 | May 6, 2019 | Proprietary © Curtiss-Wright
Global Approvals
21 | May 6, 2019 | Proprietary © Curtiss-Wright
Thank You
http://farris.cwfc.com
Farris Engineering10195 Brecksville RoadBrecksville, OH 44141 USA