PRESENTATION TO: PRESSURE SYSTEMS SAFETY REGS 2000

COMPANY PROFILE

ACCUMULATOR TYPES

REQUIREMENTS OF THE

REGULATIONS

PRACTICAL KEY POINTS

MAINTENANCE KEY POINTS

THE PRESSURE SYSTEMS SAFETY REGS 2000

DATEOWNER/USER REQUIREMENTS

FROM 1ST JULY 1990 ESTABLISH SAFE OPERATING LIMITS i.e. MAXIMUM WORKING PRESSURE

BEFORE 1ST JULY 1994

1)FOR PxV<250 BAR/LITRES:PREPARE MAINTENANCE PROCEDURES,ESTABLISH SAFE OPERATING LIMITS

2)FOR PxV>250 BAR/LITRES:AS ABOVE PLUS PREPARE A WRITTENSCHEME OF EXAMINATION i.e. NATUREAND FREQUENCY ESTABLISH A RECORDKEEPING SYSTEM.

THE WRITTEN SCHEME OF EXAMINATIONRELATIVE TO HYDROPNEUMATIC ACCUMULATORS

CONSIDERATION SHOULD BE GIVEN TO:

EXAMINATION SHOULD COVER:

BSEN 1968 – 2002 KEY REFERENCE DOCUMENT

GAS SIDE SAFETY TYPE OF GAS SAFE RELEASE IN AN EMERGENCY

BURST DISCS RATING NOT TO EXCEED DESIGN PRESSURE OF VESSEL

FUSEABLE PLUGS TEMPERATURE SENSITIVE

FLUID SIDE SAFETY ABILITY TO ISOLATE VESSEL FROM THE SYSTEM

SAFETY BLOCKS ABILITY TO DISCHARGE HYDRAULIC PRESSURE

RELIEF VALVES SINGULARLY PROTECTS THE VESSEL

CORROSION INTERNAL AND EXTERNAL

PHYSICAL DAMAGE WEAR/COLLISION

MOUNTING/CLAMPING FATIGUE DAMAGE – ABRASION – CORROSION

TESTING TYPE OF PRESSURE TEST

FREQUENCY OF EXAMINATION ENVIRONMENT/FLUIDS USED IN THE SYSTEM

FLUID POWER CENTRE CAPABILITY

PREPARE A WRITTEN SCHEME OF EXAMINATION

INSPECTION & RECERTIFICATION OF ACCUMULATORS;

• VOLUMETRIC EXPANSION TESTING OF VESSELS – BSEN1968-2002

• ON OR OFF SITE

ON GOING POLICING AND UPDATING OF WRITTEN SCHEMES

ACCUMULATOR PRECHARGE CHECKING CONTRACTS

GUARANTEED 48 HR SERVICE AND REPAIR OF ACCUMULATORS

CONSULTANCY SERVICE REGARDING USE OF ACCUMULATORS

GAS BOTTLE LARGE TANK +

ACCESSORIES

FLEXIBLE NON FLEXIBLE

BELLOWS DIAPHRAGM

BLADDER PISTON

WEIGHT LOADED

PNEUMATIC SPRING LOADED

NON SEPARATOR

SEPARATOR

ACCUMULATOR FAMILY TREE

PUMP FLOW RATE

FLUID STORED IN ACCUMULATOR

FLUID PROVIDED BY

ACCUMULATOR)

1 CYCLE OF WORK

TIME (SECS)

1 2 3 1 2

VOLU

ME

IN

LITR

ES1) REDUCTION OF INSTALLED POWER

APPLICATIONS

2) MAINTAINING PREESSURE

i.e. CLAMPING OPERATIONS

3) PULSATION DAMPENING

APPLICATIONS (Cont….)

4) SHOCK REDUCTION

i.e. CAUSED BY RAPID VALVE

OPERATION

5) THERMAL EXPANSION

6) EMERGENCY – SAFETY

7) TRANSFER BARRIER

8) COUNTER BALANCE

APPLICATIONS (Cont….)

N2

M/C TOOL HEAD

VERTICAL LEAD SCREW

DIRECT SUPPORT:-

APPLICATIONS (Cont….)

N2

PULLEY SUPPORT:-

APPLICATIONS (Cont….)

MAINTENANCE

KEY POINTS ISOLATE ACCUMULATOR FROM SYSTEM FLUID PRESSURE LINE BEFORE

COMMENCING WORK

RELEASE GAS PRESSURE BEFORE DISASSEMBLY

ASSEMBLE IN LINE WITH GENERAL ASSEMBLY DRAWING

ALWAYS USE CUSHION FLUID (10% ACC. VOLUME) DURING RE-ASSEMBLY

CHECK FOR GAS LEAKS AFTER PRECHARGING (USE ONLY OXYGEN FREE

NITROGEN) AND CHECK PRECHARGE AT SIX MONTHLY

INTERVALS

STORE SPARE BLADDERS INFLATED TO NATURAL SIZE IN SEALED PLASTIC

BAGS AWAY FROM SUNLIGHT AND ELECTRICAL EQUIPMENT