Technical Manual NTAOSB0205 December 2004
OSB
SLAM SHUT VALVE
SUMMARY INTRODUCTION .................................................. 1 CHARACTERISTICS........................................... 2 LABELLING........................................................ 2 DESCRIPTION.................................................... 3 SPARE PARTS ................................................... 3 DIMENSIONS ANDWEIGHTS............................ 4 OPERATION ....................................................... 4 INSTALLATION.................................................... 5 COMMISSIONING.............................................. 6 MAINTENANCE.................................................. 7
Type OSB
INTRODUCTION The OSB slam shut valve’s function is to protect transmission and distribution networks or pipe lines supplying industries and commercial businesses.
It permits the gas flow to be cut off rapidly and totally in the case of under or over regulator pressure.
09/12/2004
The OSB is in conformity with the Pressure Equipment Directive PED 97/23/EC and is classified in category IV.
www.francel.com
1
Technical Manual NTAOSB0205 December 2004
OSB
CHARACTERISTICS Operating pressure Body, valve plug BMS according to size Operating temperature A216 WCB body, DN 25
PS
Response time <1s Slam shut release range Pt 0.010 / 72 bar Accuracy AG 2.5 Rearming Manually, after rectification of fault Position indicator On the mechanism box Groups 1 and 2 according to PED 97/23/EC, st1and 2nd familly gas Fluid according to EN 437, or other gases (compressed air, nitrogen). The gas must be non corrosive, clean (filtration on inlet side necessary) and dry
85 bar 5 to 100 bar - 30 / 60 °C
A216 WCB body, DN > 25
TS
A352 LCC body, all DNs
- 20 / 60 °C - 30 / 60 °C
Flow coefficient DN
25
50
80
100
150
200
Qf Cg
280 543
875 1698
2700 5238
3800 7372
8600 16684
14000 27160 A28
MATERIAL Body Bonnet Orifice Valve plug Plug disc
CONNECTIONS Steel Steel Stainless steel Steel Polyurethane
Inlet / Outlet: Impulse line (IS): Mechanism box vent (E): Impulse diameter: Safety contact:
ISO PN 100 B2 ISO PN 100 J ISO PN 50 B1 1/4” NPT tapped 1/4” NPT tapped Tube interior Ø 8/10mm See NTAOS2
LABELLING
A24
2
Technical Manual NTAOSB0205 December 2004
OSB
DESCRIPTION The OSB consists of:
• A release relay (type OS2 for DN 25 to 150, type OSD for DN 200), including: - A mechanism box (BM) - A safety manometric box (BMS) to be connected on the outlet side of the regulator.
• A body with a welded orifice, enclosed by a bonnet • A valve plug with a tightshut plug disc • A bypass with a pipeline and valve plug for pressure balancing before commissioning
SPARE PARTS
A14
A16
Spare parts DN 25 to DN 100
Item
Description
A17
Spare parts DN 150
Spare parts DN 200
DN 25
DN 50
DN 80
DN 100
DN 150
DN 200
1
Screw
140326
402421
402431
402453
402222
402461
2
Nut
404304
404306
404307
404309
404308
404310
3
O-ring
400010
400031
400075
400023
400076 (x2)
400026 (x2)
4
Valve plug
131130
130317
139786
139516
144521
144526
Packing gland «kit»
181104
5
Release relay OS2 or OSD
See NTAOS2 manual
6
Packing glandO-ring (stem)
400505
7
Packing gland O-ring
400514 A15
3
Technical Manual NTAOSB0205 December 2004
OSB
DIMENSIONS AND WEIGHTS
A18
DN 25 50 80 100 150 200
A 200 300 350 440 502 610
B 80 110 120 205 205 275
C 120 170 205 245 305 360
DIMENSIONS D maxi 217 217 217 217 217 290
E 220 220 220 220 220 245
F 130 180 230 275 360 480
G 200 230 270 280 300 370
MASSE (kg) 25 40 75 105 215 360 A19
OPERATION The pressure of the zone to be protected (generally the pipe line on the outlet side of the pressure regulator and situated after the slam shut valve) activates the safety manometric box BMS. If pressure rises above the release set point the release relay frees the valve plug4. Through the action of the weight of the valve plug, the closing spring and the fluid (attempting to close), the valve plug will seat into the orifice8. The gas flow is obstructed until the mechanism box is manually rearmed. To reopen the valve plug an equal pressure balance on inlet and outlet sides is required. The mechanism box is rearmed after opening the internal bypass 9. Rearming and balancing are achieved at the same time. A25
4
Technical Manual NTAOSB0205 December 2004
OSB
INSTALLATION
A23
All interventions on the equipement should only be performed by qualified and trained personnel.
!
! •
The slam shut valve is installed on the inlet side of the regulator, on horizontal pipeline, with the mechanism box above the body (see schematic).
•
It is recommended to install an isolation valve and an atmospheric valve, which can be useful for tripping and verifications.
•
Installation according to EN12186 is recommended.
•
Verify that the inlet side is protected by an appropriate device(s) to avoid exceeding the limits of utilization (PS, TS).
•
Install according to the direction of fluid flow (arrow).
•
Verify that the limits of utilization correspond to the appropriate operating conditions.
•
When assembling with adjacent elements, care must be taken not to create pressure force on the body and the assembling elements (boltage, O-rings, flanges) should be compatible with the geometry and working conditions of the equipment.
•
Verify that the safety manometric box (BMS) and spring correspond to the appropriate operating conditions on the outlet side of the regulator.
•
The equipment should not receive any type of shock, especially the release relay.
•
Fire, seismic and lightening are not taken into consideration for standard regulators. If required, a special product selection and/or specific calculations may be supplied according to specific requirements.
•
The user should verify or carry out a protection adapted to the environment.
•
If the case arrises a support must be used to avoid pressure force on the body (a support can be installed under the flanges).
•
Connect the safety manometric box (IS) to the impulse at 4D on a straight run of the outlet pipe.
•
No modification should be made to the structure of the equipment (drilling, grinding, soldering ...).
5
Technical Manual NTAOSB0205 December 2004
OSB
COMMISSIONING •
All interventions on the equipment should only be performed by qualified and trained personnel.
Regulator Commissioning (see corresponding manual)
PRELIMINARY VERIFICATIONS Start-up positions •
Inlet and outlet valve Closed Verify absence of pressure between inlet and outlet valves • Slam shut valve plug Closed • Slam shut valve bypass Closed • Impulse line isolating valve Closed • Impulse line atmospheric valve Open Set point verification
A26
Stage 1 •1
Using the atmospheric valve, inject a pressure equal to the pressure foreseen for the regulator •1 st release relay stage Set (Stage 1) • Slam shut valve plug Open (Stage 2) Progressively increase the pressure to reach tripping Adjust setting if necessary (NTAOS2) Note the set point value on the equipment or mark it in a commissioning document
Stage 2
• •
•
Impulse line isolating valve Open • Impulse line atmospheric valve Closed • Slam shut valve plug Closed The equipment is ready for commissioning
•
Slam shut valve plug Open (Stage 2) Slam shut valve bypass Close Outlet valve Open slowly
The equipment is commissioned After checking and commissioning the release relay it is recommended to seal it
COMMISSIONING max. only or max. and min.
•
release relay stage Set (Stage 1)
A27
Positions before commissioning
•
st
Inlet valve Open slowly Valve internal bypass Open slowly 6
Technical Manual NTAOSB0205 December 2004
OSB
MAINTENANCE SERVICING CHECK
• Slam shut valve plug Open • Regulator In operation Inlet and outlet side of regulator under pressure
Recommended frequency: Twice yearly minimum Verification: Tripping and tripping value Slam shut valve plug tightness
Tripping verification
• • •
Departure positions
• •
Inlet valve Outlet valve
Inlet valve Outlet valve Regulator
Open Open
If the valve will not close
Closed Closed Increase set point until tripping occurs (without exceeding the outlet limits)
Operating fault Check the release relay Check the slam shut valve plug
or contact after-sales
External leak Locate and seal the leak
or contact after-sales
If the valve closes Observe the evolution of the outlet pressure (check tightness) If the outlet pressure decreases If the outlet pressure is constant Bleed off outlet side of the regulator Observe the evolution of the outlet pressure (check tightness) If the outlet pressure increases
If the outlet pressure is constant
Internal leak Check the slam shut valve plug Check the orifice Check the bypass Valve is tightshut
7
or contact after-sales
Technical Manual NTAOSB0205 December 2004
OSB
MAINTENANCE DISASSEMBLY Recommended frequency: Every 4 to 6 years (or less depending on operating conditions) Verification: Condition of O-rings, diaphragms, valve plug disc, lubrication Replacement: O-rings, diaphragm Tools: Spanners 10, 11, 12 2 spanners according to DN size • Valve plug closed • Close inlet and outlet valve
DN
Spanner
Torque (N.m)
25 50 80 100 150 200
17 22 24 30 27 32
30 80 90 180 100 200
• Bleed off outlet pressure
A22
• Bleed off inlet pressure • Unscrew impulse line connectionIS • Remove BM cover 2
A21
• Unscrew fastening screw3 • Remove cap • Remove BM • Change the valve plug disc every 12 years or less depending on condition
• Unscrew screws (and nuts)4 • Remove bonnet
• Replace O-rings at each disassembly
• Remove spring 6 and slam shut valve plug8
• Lubricate screws before tightening • Lightly lubricate O-rings (silicone grease)
REASSEMBLY
• Lightly lubricate the stem (silicone grease)
• Perform the above operations in reverse order (respect tightening torques)
• Lubricate the release relay mechanism (yoke and bolt) (molybdene graphite grease)
• Change diaphragm every 6 years or less depending on condition
• Lubricate the BMS spring (molybdene graphite grease)
©
8