Leser 526 API Manuale utente

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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Type 526 API

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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Contents

1Purpose............................................................................................................... 2

2Scope.................................................................................................................. 2

3References.......................................................................................................... 3

4Disclaimer............................................................................................................ 3

5Qualified fitting personnel.................................................................................... 3

6General Information............................................................................................. 3

7General illustration .............................................................................................. 4

8Preparation for valve assembly ........................................................................... 5

8.1 Emboss the punch numbers (if requested in the order)................................ 5

9Assembly of type 526.......................................................................................... 5

9.1 Assembly of the nozzle and blow down ring................................................. 5

9.2 Screw the studs into the body. ..................................................................... 7

9.3 Installation of the locking screw and screw plug........................................... 7

9.4 Assembly of disc assembly.......................................................................... 9

9.5 Assembly of spindle/disc assembly............................................................ 13

9.6 Assembly of the bonnet.............................................................................. 24

9.7 Determination and installation of the lift stopper......................................... 25

9.8 Assembly of the adjusting screw................................................................ 28

9.9 Adjusting the set pressure.......................................................................... 30

9.10 Testing the seat tightness P12................................................................... 31

9.11 Assembly of the cap / lever ........................................................................ 31

9.12 Assembly of the lift indicator....................................................................... 38

9.13 Installation of the test gag (possible for H2 and H4)................................... 40

9.14 Installation of the different O-ring dampers ................................................ 41

9.15 Adjusting the set pressure.......................................................................... 45

9.16 Testing the seal tightness of the back seal P21 ......................................... 45

9.17 Sealing the valve........................................................................................ 45

1 Purpose

This LESER Global Standard (LGS) describes the assembly procedure for a LESER

safety valve type 526 API.

2 Scope

This document must be applied to the assembly of an API safety valve in agencies

and subsidiaries of LESER GmbH & Co. KG.

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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3 References

LGS 3325 (LWN 322-04)

WI 3308-08 (LWN 308-08)

LGS 3323 (LWN 322-03)

WI 3324-01 (LWN 324.01)

4 Disclaimer

LESER puts in a great deal of effort into making up-to-date and correct

documentation available. Nevertheless, LESER GmbH & Co. KG gives no guarantee

that the recommended actions presented here are entirely correct and error free.

This document is to be used exclusively with the specified type. LESER GmbH & Co.

KG declines any liability or responsibility for the correctness and completeness of the

content.

LESER GmbH & Co. KG reserves the right to change the information contained in

this document, which is for the products of LESER GmbH & Co. KG and is intended

for LESER subsidiaries, at any time and without prior announcement.

LESER GmbH & Co. KG is available to the users of this document to provide

additional information.

5 Qualified fitting personnel

The assembly of LESER safety valves may only be performed by trained or qualified

fitters. The qualifications must be obtained through the appropriate training

measures.

6 General Information

Gloves must be worn during the entire assembly.

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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7 General illustration

Figure 7-1: Cross-sectional view of API 526

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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8 Preparation for valve assembly

8.1 Emboss the punch numbers (if requested in the order).

Illustration

Description

Aids / Tools

Figure 8.1-1

Emboss the code into the

edge of the outlet flange

(position of the code as

per the work plan).

Hammer

Punch numbers

9 Assembly of type 526

9.1 Assembly of the nozzle and blow down ring

Illustration

Description

Aids / Tools

Figure 9.1-1

Grease sealing surface

Brush

Assembly

grease

(Molykote

Paste)

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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Illustration

Description

Aids / Tools

While screwing the nozzle

into the body, the

protection of the nozzle

should stay in place to

secure the sealing surface

against damage.

Figure 9.1-2

Screw nozzle into the

body.

Figure 9.1-3

Tighten nozzle with C-

spanner (put a small

protective slab between

the nozzle and C-

spanner).

C-spanner with a

nose

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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Figure 9.1-4

Screw the blow down ring

completely down to the

nozzle.

9.2 Screw the studs into the body.

Illustration

Description

Aids / Tools

Figure 9.2-1

Screw in the studs with an

impact wrench.

Tip: Place the guide washer

on the opening of the body

so that no studs can fall on

the seat.

Impact wrench

9.3 Installation of the locking screw and screw plug

Illustration

Description

Aids / Tools

Figure 9.3-1

Grease the locking screw

and screw plug.

Brush

Halocarbon

(OI-56 S / 60H)

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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Figure 9.3-2

Grease a spacer ring for

each of the screws and put

on as a seal.

Illustration

Description

Aids / Tools

Figure 9.3-3

Screw the locking screw into

the back section of the body

and tighten.

Open-end

spanner

Figure 9.3-4

Screw the screw plug into

the side of the body and

tighten.

Open-end and

ring spanner

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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9.4 Assembly of disc assembly

9.4.1 Metal seat

Illustration

Description

Aids / Tools

Figure 9.4.1-1

Put disc body and lifting aid

together and clamp in place.

Clamping block

Figure 9.4.1-2

Insert retaining ring and

tighten with C-spanner.

C-spanner with

a nose

9.4.2 O-ring seal

Illustration

Description

Aids / Tools

Figure 9.4.2-1

Individual parts of the disc

assembly with O-ring seal

LESER Global Standard

Assembly instructions for type 526 API

LGS 4104

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Illustration

Description

Aids / Tools

Figure 9.4.2-2

Wet O-ring with water and avoid any

twisting when introducing it.

Figure 9.4.2-3

Insert retainer.

Figure 9.4.2-4

Screw nut onto neck and tighten.

(Set torque as per LGS 3325 ).

Torque wrench

with socket

attachment

Clamping block

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