Roth BA-UAK-ASME-EN User manual

OPERATING INSTRUCTION
PISTON ACCUMULATOR
WITH ASME U-DESIGNATOR
ACCORDING ASME VIII DIV. I
Type: BA-UAK-ASME-EN
Language: English
Edition: 09-2016
Revision: 01
Translated from German original

Operating instruction piston accumulator UAK - English
General
Roth pressure equipment - identification
in accordance with the serial number on the nameplate and the according report, see
•ASME Code Sec. VIII, Division 1
Explanation
Roth piston accumulator = Roth pressure equipment
Translation
If sold to a country in the EEA, this operating instruction must be translated into the language of the
country in which the machine is to be used.
Should the translated text contain incongruities, the original operating manual (German) must be
consulted or the manufacturer contacted for clarification.
Copyright
No part of this publication may be reproduced, transmitted, sold or communicated without prior
permission. Damages will be claimed for violations.
All rights reserved.

Operating instruction piston accumulator UAK - English 1
0 Contents
0.1 Table of Contents
0 Contents____________________________________________________________________ 1
0.1 Table of Contents_____________________________________________________________ 1
0.2 Table of figures_______________________________________________________________ 1
1 Designated application_________________________________________________________ 2
1.1 Overview of standard Roth pressure equipment _____________________________________ 2
1.2 Notes on designated application _________________________________________________ 3
2 Function ____________________________________________________________________ 4
2.1 General functional description ___________________________________________________ 4
2.2 Filling and testing the pressure equipment _________________________________________ 4
2.2.1 Isochore behavior of N2________________________________________________________ 5
3 Safety______________________________________________________________________ 6
3.1 Notes / Explanations __________________________________________________________ 6
3.2 Identification / Nameplate_______________________________________________________ 6
3.3 Safety systems_______________________________________________________________ 6
3.4 Safety precautions ____________________________________________________________ 6
3.5 Responsibilities of the operator __________________________________________________ 7
4 Dangers ____________________________________________________________________ 8
4.1 General hazard notes__________________________________________________________ 8
4.2 Installation of spare and wearing parts ____________________________________________ 8
4.3 Cleaning, maintenance and repair work ___________________________________________ 8
5 Installation __________________________________________________________________ 8
5.1 Scope of delivery _____________________________________________________________ 8
5.2 Transport and packaging _______________________________________________________ 9
5.3 Storage_____________________________________________________________________ 9
5.4 Assembly / Commissioning ____________________________________________________ 10
6 Maintenance________________________________________________________________ 11
6.1 General maintenance notes____________________________________________________ 11
6.2 Periods of repeated inspection__________________________________________________ 11
7 Disturbance, causes, troubleshooting (qualified staff only) ____________________________ 12
8 Emergencies _______________________________________________________________ 12
9 Dissembling / disposal ________________________________________________________ 12
Notes __________________________________________________________________________ 13
0.2 Table of figures
Figure 1-1 Overview of standard Roth pressure equipment _____________________________ 2
Figure 2-1 Isochore behavior of N2 ________________________________________________ 5

2 Operating instruction piston accumulator UAK - English
1 Designated application
1.1 Overview of standard Roth pressure equipment
The pressure equipment essentially consist of the following components:
1. Cylinder tube
2. Piston inclusive seals
3. End cap
4. Threaded ring (not for screw-in end cap)
5. End cap seal, oil side
6. End cap seal, gas side
7. N2 non-return valve (optional)
8. Screw plug (optional)
Figure 1-1 Overview of standard Roth pressure equipment

Operating instruction piston accumulator UAK - English 3
1.2 Notes on designated application
The Roth piston accumulator (Roth pressure equipment) was manufactured exclusively for use as an
industrial and commercial component designed for acceptance and delivery of pressurised hydraulic
fluids in hydraulic systems.
Any use of the pressure equipment other than or beyond as described above or any conversion by the
operator or others shall be regarded as contrary to designated use, unless by prior written agreement
of the manufacturer.
The manufacturer shall accept no liability for damages arising from this.
The pressure equipment may only be used with non-corrosive fluids in group 2 (Art. 13, PED
2014/68/EU) on the fluid side and with nitrogen (N2) on the gas side. Wear allowance (e.g. corrosion)
is not considered. Exceptions may result from the declaration of conformity or from individual
manufacturer’s specifications of the pressure equipment.
Pursuant to ISO 4406 the degree of purity of the operating fluid shall be at least 19/17/14 (NAS 1638
Class 8) for vertical installation and at least 17/15/12 (NAS 1638 Class 6) for horizontal installation, or
better.
Depending on the mode of operation, stricter requirements might be necessary. Nitrogen (N2) Class
4.0 (99.99%) or better shall be used.
Intended use also includes compliance with the manufacturer’s operating, maintenance and
servicing instructions.
Furthermore, the operator is obliged to adhere to the legal state regulations according pressure
equipments in connection with the adherence of the mandatory tests prior to commissioning and
recurrent tests and must arrange these in compliance with the mandatory periods (see chapter 3.5).
The commissioning is prohibited until the entire system into which the pressure equipment
will be installed has been certified compliant with the national and regional regulations.
The fluids required for operation of the pressure equipment is procured and used by the
operator. Proper treatment of these fluids and the associated dangers are the sole
responsibility of the operator.
Furthermore, the selections of a fluid are into consideration low-risk operation based on
experience gained by the operator in the course of repeated use thereof in pressure
equipment.
We recommend you also concluding guarantee agreements with suppliers of the fluids.
Please request written approval from the “manufacturer” in cases of special uses or if you
have queries.
It is not permissible to interrupt / stop operation of the system in a way to allow the piston
(see Fig. 1-1, Pos. 2) to hit the end cap of oil side (see Fig. 1-1, Pos. 3) at high speed (e.g.
fast oil pressure release without end position damping)! This excludes emergency stop
systems.

4 Operating instruction piston accumulator UAK - English
2 Function
2.1 General functional description
Roth pressure equipments are cylindrical pressure vessels with a separating element between gas
and fluid volumes (see Fig. 1-1).
They are used in hydraulic systems among others for energy accumulator.If the fluid pressure rises
above the gas filling pressure, hydraulic energy is stored in fluid form. This may be utilised for work
steps when the fluid pressure falls below the pressure of the compressed gas.
2.2 Filling and testing the pressure equipment
During or after filling with N2, use foaming agents to test all screwed connections, shut-off
valves, connections and joints for gas-tight sealing.
In principle, use Roth filling and testing device and observe the relevant operating
instruction.
The pre-filling pressure (P
0
) depends on the ambient temperature (isochore behavior of N2, see
Chapter 2.2.1) and should be 5 bar below the minimum operating pressure at maximum ambient
temperature (unless otherwise specified).
Never use oxygen or other flammable gases to fill the pressure vessel.

Operating instruction piston accumulator UAK - English 5
2.2.1 Isochore behavior of N2
Determining or controlling the pre-filling pressure (P
0
) at different ambient temperatures
General
Unless otherwise specified, the given P
0
refers to room temperatures of + 20°C. Should the actual
ambient temperature be different at the time of filling or checking P
0
, the diagram may be used to find
the pressure corresponding to that temperature when filling or checking.
Example
Assume a gas system at 155 bar of pressure at a gas temperature of + 20°C. If the gas temperature
rises to + 35°C, the intersection (155 bar at + 20°C) will shift to the next pressure-temperature curve to
intersect the vertical + 35°C temperature line. The fill or corrected pressure P
0
will need to be 166 bar
in this example.
Figure 2-1 Isochore behavior of N2

6 Operating instruction piston accumulator UAK - English
3 Safety
3.1 Notes / Explanations
Operating instruction, mandatory:
marked with a “book”
Warnings:
marked with a warning triangle “danger”.
Explosion:
marked with a warning triangle “explosion”.
Notes:
marked with a “hand”.
The vessel filled with N2 already, as given on the pressure equipment nameplate.
3.2 Identification / Nameplate
The pressure equipment has a nameplate and an ASME U-Designator attached. These show
essential technical data.
Please provide the following with all your enquiries:
•Indication of the type
•Serial number
•Date of manufacture
3.3 Safety systems
The safety systems may be included in the delivery (see delivery papers) or constitute part of
the customer installation.
They will always be required and should be tested for effectiveness prior to commissioning.
3.4 Safety precautions
The operator shall instruct the operating and maintenance staff on the proper operation of the
pressure equipment and monitor compliance with the safety precautions.

Operating instruction piston accumulator UAK - English 7
The responsible specialist superiors must instruct the operating, servicing and maintenance staff
before starting in their jobs or prior to commissioning of the pressure equipment and thereafter at
appropriate intervals of at least once per year. All services, maintenance and instruction courses must
be recorded in a control book.
Qualified technician (definition based on EN 60204-1)
•A person who, based on specific training, knowledge and experience and knowledge of pertinent
standards, will be in a position to assess assigned work and recognise potential hazards.
3.5 Responsibilities of the operator
The applications and requirements of the national and regional rules and regulations are to
ascertain and take into account.
Also ensure that local regulation on
•the safety of staff (accident regulations)
•the safety of working material (protective equipment and maintenance)
•product disposal (waste disposal laws)
•material disposal (waste disposal laws)
•cleaning (cleaning agents and disposal)
•and environmental protection
will be complied with.
Local regulations must be observed during installation and commissioning carried out by the operator
itself (e.g. acceptance testing etc.).

8 Operating instruction piston accumulator UAK - English
4 Dangers
4.1 General hazard notes
Operations must remain within the maximum and minimum limits specified on the nameplate and in
the technical documentation.
The pressure equipment must be installed ensuring that operating staff will not be endangered by
escaping operating materials should parts of the safety system trigger.
Structural modifications
Structural modifications to the pressure equipment are prohibited. Mechanical reworking or welding is
prohibited.
4.2 Installation of spare and wearing parts
The manufacturer’s guarantees will lapse should parts that have not been tested or approved by the
manufacturer be installed.
Pressure-retaining components must only be replaced by or with the approval of the
manufacturer.
Renewed acceptance testing by a notified body will be required! The N2 concentration in the
environment may increase when N2 is filled or drained. Adequate ventilation must be
ensured.
4.3 Cleaning, maintenance and repair work
Cleaning, maintenance or repair work may only be carried out by qualified technicians.
These activities require that systems pressure must be relieved on the oil side, including securing
against accidental switch-on.
The gas side pressure must also be relieved before performing work on gas side components.
5 Installation
5.1 Scope of delivery
The supplied pressure equipment / components include(s) technical documentation with operating
instructions, drawings and the data report (acceptance report by the notified body in case of individual
acceptance tests).
Delivery
Incoming inspection:
•Check completeness as per the delivery note!
In case of damages:
•Check the delivery for damages (visual inspection)!
In case of complaints:
If the shipment damaged during transportation:
•Contact the most recent forwarder immediately!
•Keep the packaging (for possible inspection by the forwarder or for return shipment).