PERSTA 990 ST User manual

High pressure strainer
990 ST/990 SF
Operating instructions
Read the instructions prior to performing any task!

Pers-29961-DE, 2, en_GB
Translation of the original operating instructions
© Stahl-Armaturen PERSTA GmbH 2014
Stahl-Armaturen PERSTA GmbH
Mülheimer Str. 18
59581 Warstein-Belecke
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Internet: www.persta.com
20.05.2021High pressure strainer 990 ST/990 SF2

This manual enables safe and efficient handling of the high pres-
sure valve.
The manual is a component of the high pressure valve and must
be kept in the vicinity of the high pressure valve where it is avail-
able to personnel at all times.
The personnel must have carefully read and understood this
manual before performing any tasks. The basic prerequisite for
safe work is compliance with all the specified safety notices and
instructions.
In addition, the local occupational safety regulations and general
safety regulations must be complied with for the high pressure
valve’s area of use.
The illustrations in this manual are provided as examples only and
may deviate from the actual version.
Although the size and pressure ratings of the valve
types vary, the information in these instructions
applies generally to all valves, provided nothing to
the contrary is specified.
This manual applies to the following versions of the series 990
ST/990 SF of the high pressure strainer:
Designation Series Nominal diameter
(DN) [mm]
Pressure rate Class*
High pressure strainer 990 ST 10–65 PN 500 £ 3200
High pressure strainer 990 SF 80–250 PD 25/40 £ 2500
*Assignment number in the pipe construction
nIgnition hazard assessment GA004
nConnection diagram provided
nRisk analysis according to Pressure Equipment Directive
nRisk analysis as per the Machinery Directive
nTechnical data sheet
nBolt tightening torques according to the website:
www.persta.com
nAnd other documents included in the delivery
Information about the operating
manual
Scope of the document
Other applicable documents
Supplemental directives
20.05.2021 High pressure strainer 990 ST/990 SF 3

Mülheimer Str. 18
59581 Warstein, Germany
Phone: [phone]
Fax: [phone]
e-mail: [email protected]
Tab. 1: Revision overview
Revision number Change/supplement Date
1 Updates to chapter “ Intended
use”.
05/05/2021
Customer Service - Stahl-Arma-
turen PERSTA GmbH
Supplemental directives
20.05.2021High pressure strainer 990 ST/990 SF4

Table of contents
1 Overview.............................................................................. 7
2 Safety................................................................................. 11
2.1 Symbols in this manual............................................... 11
2.2 Intended use............................................................... 13
2.3 Safety signs................................................................ 14
2.4 Residual risks............................................................. 15
2.4.1 Basic dangers at the workplace............................... 15
2.4.2 Mechanical hazards................................................. 16
2.4.3 Thermal dangers...................................................... 16
2.4.4 Hazards due to hazardous substances and oper-
ating materials......................................................... 17
2.5 Behaviour in the event of an emergency.................... 18
2.6 Responsibility of the operating company.................... 18
2.7 Personnel requirements.............................................. 20
2.8 Personal protective equipment................................... 22
2.9 Spare parts................................................................. 23
2.10 Environmental protection.......................................... 24
3 Functional description..................................................... 25
3.1 Mode of operation of the high pressure strainer......... 25
3.2 External seals............................................................. 26
3.2.1 High pressure strainer 990 ST................................. 26
3.2.2 High pressure strainer 990 SF................................. 27
3.3 Screen cylinder........................................................... 28
3.3.1 High pressure strainer 990 ST................................. 28
3.3.2 High pressure strainer 990 SF................................. 28
3.4 Connections................................................................ 29
4 Transport and storage...................................................... 31
4.1 Safety instructions for transport and storage.............. 31
4.2 Transport of packages................................................ 32
4.3 Storage of the valve.................................................... 32
4.4 Storage of spare parts................................................ 33
5 Installation......................................................................... 35
5.1 Safety notices for installation...................................... 35
5.2 Before the installation................................................. 36
5.3 Installing the valve...................................................... 36
5.4 After the installation.................................................... 37
5.4.1 Pickling the valve..................................................... 38
5.4.2 Painting the valve.................................................... 38
5.4.3 Executing the system pressure test and leak test... 38
5.4.4 Applying thermal insulation...................................... 39
6 Commissioning................................................................. 41
6.1 Safety notices for commissioning............................... 41
Table of contents
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6.2 Prior to commissioning............................................... 43
6.3 Executing the commissioning process........................ 43
7 Maintenance...................................................................... 45
7.1 Safety instructions for maintenance............................ 45
7.2 Maintenance schedule................................................ 49
7.3 Maintenance tasks...................................................... 49
7.3.1 Visually checking the valve...................................... 49
7.3.2 Cleaning the screen cylinder................................... 50
7.3.3 Replacing the gasket ring........................................ 52
7.3.4 Replacing the screen cylinder.................................. 59
7.3.5 Executing final tests on the sealed pressure sealing
bonnet...................................................................... 63
8 Faults and fault correction............................................... 65
8.1 Safety notices for fault correction............................... 65
8.2 Fault table................................................................... 67
9 Dismantling, disposal....................................................... 69
9.1 Safety notice for dismantling and disposal................. 69
9.2 Dismantling................................................................. 71
9.3 Disposal...................................................................... 72
10 Index................................................................................... 73
Table of contents
20.05.2021High pressure strainer 990 ST/990 SF6

1 Overview
Fig. 1: High pressure strainer 990 ST
High pressure strainer 990 ST
Overview
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Fig. 2: High pressure strainer 990 SF
The valve designated as high pressure strainer is designed for
installation in pipes.
By using the high pressure strainer, foreign objects in the pumping
medium are retained in the screen (Fig. 1/1, Fig. 2/1).
The fineness of filtration of the screen can be increased or reduced
depending on the mesh width of the screen.
Depending on its type, the high pressure strainer is supplied with a
pressure sealing bonnet (Fig. 2/2).
The following tools are required for the tasks described in the oper-
ating manual:
Forklift
Forklift with sufficient load-bearing capacity for transport of valves.
Hoist
Hoist with sufficient load-bearing capacity for transporting valves
and components.
Pin puncher
Mandrel-like tool for punching out the segment rings.
High pressure strainer 990 SF
Brief description - high pressure
strainer
Tools
Overview
20.05.2021High pressure strainer 990 ST/990 SF8

Sling gear
Functional and approved gear for attaching valves and compo-
nents on the hoist.
Overview
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Overview
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