1. General Introduction
Farris 3800 pressure relief valves is the pilot operated type certified under Section VIII of the ASME Code for Air, Gas, Vapor, Steam and liquid service. It conforms to API 526 standard, both snap Acting and modulating control actuation optional with semi and full port nozzle design, typically application for relief case of blow down of 3-6%. A pilot valve with a modulating control has the same operating advantages as a snap acting pilot control: operates bubble-tight close to set pressure and is unaffected by back pressure. In addition, the modulating control responds gradually and proportionately to the rise in over pressure, minimizing product losses and reducing reaction forces when the flow requirement is below the maximum rated flow of the valve.
2. General Specification
Size | 1” x 2” to 12” x 16” |
Orifice Areas | D (0.15in2) to T (26 in2) |
Non-API Orifice Areas | A, 1-8 (45.66 sq2) |
Set Pressure Ranges | 15 to 6170 psig (1.0 to 425 barg) |
Temperature Ranges | -320 to 500°F (-195 to 260°C) |
Flange Classes | 150# to 2500# |
Suitable for | Air, Gas, Vapor, Steam & Liquid Service |
Materials of Construction | Carbon Steel, Stainless Steel, Low/High Temperature Alloy Steels, Monel, Hastelloy C, Duplex, NACE Compliant Materials |
Accessories | Dual Pilot, Reverse Flow Preventer, Field Test Connection, Remote Depressurizing, Auxiliary Filters |
Certifications | ASME/NB Section VIII and III for Air, Steam and Water CSA B51 (Canada CRN) ISO 9001- 2008 PED 97/23/EC (European Pressure Equipment Directive) ATEX 94/9/EC (European Potentially Explosive Atmospheres) CSQL (Dubai of UAE) GOST-R (Russian) US Coast Guard Nuclear – 10 CRF 50 Appendix B, NCA-4000, NQA-1 N285.0 First Point Assessment Limited |
3. Model selection of 3800 pressure relief valves
Main Code | Suffix Codes | Description | ||||||||
38 | 3800 pilot operated pressure relief valves | |||||||||
Orifice Areas | D | API=0.110 in2, Actual=0.150 in2; / API=71 mm2, Actual=97 mm2 | ||||||||
E | API=0.196 in2, Actual=0.225 in2; / API=126 mm2, Actual=145 mm2 | |||||||||
F | API=0.307 in2, Actual=0.371 in2; / API=198mm2, Actual=239 mm2 | |||||||||
G | API=0.503 in2, Actual=0.5591in2; / API=325 mm2, Actual=361 mm2 | |||||||||
H | API=0.785 in2, Actual=0.8731 in2; / API=506 mm2, Actual=563 mm2 | |||||||||
J | API=1.287 in2, Actual=1.430 in2; / API=83 mm2, Actual=923 mm2 | |||||||||
K | API=1.838 in2, Actual=2.042 in2; / API=1186 mm2, Actual=1317 mm2 | |||||||||
L | API=2.853 in2, Actual=3.170 in2; / API=1841 mm2, Actual=2045 mm2 | |||||||||
M | API=3.60 in2, Actual=4.000 in2; / API=2323 mm2, Actual=2581 mm2 | |||||||||
N | API=4.34 in2, Actual=4.822 in2; / API=2800 mm2, Actual=3111 mm2 | |||||||||
P | API=6.38 in2, Actual=7.087 in2; / API=4116 mm2, Actual=4572 mm2 | |||||||||
Q | API=11.05 in2, Actual=12.27 in2; / API=719 mm2, Actual=7916 mm2 | |||||||||
R | API=16.0 in2, Actual=17.78 in2; / API=10323 mm2, Actual=11471 mm2 | |||||||||
T | API=26.0 in2, Actual=28.94 in2; / API=16774 mm2, Actual=18671 mm2 | |||||||||
A | Actual=0.719 in2; / Actual=464 mm2 | |||||||||
1 | Actual=1.767 in2; / Actual=1140 mm2 | |||||||||
2 | Actual=2.953 in2; / Actual=1905 mm2 | |||||||||
3 | Actual=6.605 in2; / Actual=4261 mm2 | |||||||||
4 | Actual=11.5 in2; / Actual=7419 mm2 | |||||||||
6 | Actual=26.07 in2; / Actual=16819 mm2 | |||||||||
8 | Actual=45.66 in2; / Actual=29458 mm2 | |||||||||
Construction | C | Elastomer O-Ring Seat & Seals | ||||||||
T | PTFE O-Ring Seat & Seals | |||||||||
Temperatures & Materials | 1 | Inlet temperature -20 to 450℉, Carbon steel body & Stainless Steel piston | ||||||||
2 | Inlet temperature -20 to 500℉, Carbon steel body & PH Stainless Steel piston | |||||||||
8 | Inlet temperature -450 to -50℉, Stainless Steel body & Stainless Steel piston | |||||||||
Inlet Class | 0 | ASME Flanges Class 150 | ||||||||
2 | ASME Flanges Class 300 | |||||||||
3 | ASME Flanges Class 600 | |||||||||
4 | ASME Flanges Class 900 | |||||||||
5 | ASME Flanges Class 1500 | |||||||||
6 | ASME Flanges Class 2500 | |||||||||
Special Construction (If applicable) | L | Liquid Service (Standard Connections) | ||||||||
X | Air & Vapor Service (Oversize Connections | |||||||||
Y | Liquid Service (Oversize Connections) | |||||||||
D | Air & Vapor Service (Dual Outlet) | |||||||||
E | Liquid Service (Dual Outlet) | |||||||||
U | Air & Vapor Service (Non-Standard API Connections) | |||||||||
N | Air & Vapor Service (Non-Standard API Connections) | |||||||||
Inlet Facing | 1 | Raised Face, ASME Std. (125 to 160 AARH) | ||||||||
9 | Ring Joint (octagonal), ASME Std. | |||||||||
H | 63-83 AARH Smooth, Finish RF | |||||||||
J | 63 to 83 AARH (outlet only) | |||||||||
K | 63 to 83 AARH (inlet & outlet) | |||||||||
X | Special Welded Connections | |||||||||
Pilot Control | 2 | PCF5 Snap Acting Control | ||||||||
3 | PCL Liquid Snap Acting Control | |||||||||
4 | PCM Modulating Control | |||||||||
5 | PCMS Modulating Control | |||||||||
6 | HPCM High Pressure Modulating Control | |||||||||
7 | HPCM7 High Pressure Modulating Control | |||||||||
Options | 0 | No Options | ||||||||
1 | Test Gag | |||||||||
2 | Dual Pilot Controls | |||||||||
3 | Auxiliary Filter | |||||||||
4 | Manual Depressurizing | |||||||||
5 | Field Test Connection | |||||||||
6 | Reverse Flow Preventer | |||||||||
7 | Pressure Spike Snubbers | |||||||||
8 | Remote Depressurizing | |||||||||
F | Field Test Connection with Indicator | |||||||||
R | Remote Sensing | |||||||||
V | Pilot Control Discharge Connected to Main Valve Outlet | |||||||||
Special Material | S3 | Complete 316 St. St. PH St. St. Piston | ||||||||
S4 | Complete 316 St. St. | |||||||||
N1 | NACE Compliant Carbon St. Body | |||||||||
N3 | NACE Compliant PH St. St. Piston | |||||||||
N4 | NACE Compliant Complete 316 St. St. | |||||||||
M4 | Complete Monel | |||||||||
H4 | Complete Hastelloy C | |||||||||
D4 | Duplex St. St. | |||||||||
D8 | Super Duplex St. St. | |||||||||
LB | Low temperature carbon steel - LCB Body | |||||||||
LC | Low temperature carbon steel - LCC Body | |||||||||
