OSB Instruction Manual

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.

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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

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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

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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

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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 ...).

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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

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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)

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