MARINE & OFFSHORE PRODUCTS
Why MHA ZENTGRAF?
Firesafe Ball Valves
spring washer
graphite rings
metallic sleeve
spring washer
MHA ZENTGRAF provides the following advantages
•A
large number of standardized solutions.
• An
unlimited number of individual solutions.
When handling flammable liquids, safety must be a prime consideration. Great importance is therefore attributed to the design of “fire-safe” shut-off valves utilized in many industrial environments
including:
substantial engineering staff combining experience and innovation with confidence.
•
chemical and petrochemical plants
•A
quality and certified product.
•
oil drilling and refineries
•A
highly competitive solution at a reasonable cost.
•
on- /offshore installations
•A
We supply high-quality ball valves into the offshore and marine industry for many years.
Understanding the needs of this industry is the key for your success. We provide tech-
When fire does break out, it is important that it does not spread through failures in pipe-work systems. Even under the most extreme conditions shut-off valves must provide:
nology able to withstand extreme conditions to guarantee that processes run safely and
•
secure operation
smoothly. We will not rest until you are satisfied.
•
reliable sealing in shut-off position
•
reliable sealing to the outside
Amongst others we provide valves with the following key features
•
Firesafe DIN EN ISO 10497 / API 6FA
• ATEX
Ex II 2G
•
Materials in acc. to NACE MR 0175
•
Notable classification societies approvals
Due to their quarter turn shut-off design, MHA ball valves provide a solution to meet these demands. Metal seat edges at the ball seats guarantee the sealing function during and after contact
with fire, even if the seals are burnt. In addition, both housings and shafts are sealed with heat
resistant seats, ensuring their continued operation.
MHA ball valves of the BKH- and KH-series have been tested successfully according to firesafe
standard ISO 10497. Currently MHA is certified for the BKH series with nominal sizes from DN 4 to
DN 50 and the KH series with nominal sizes from DN 25 to DN 125, within a nominal pressure range
up to PN 420 bar.
oxygen
explosion
ignition
source
ATEX Ball Valves
Double Safety & Bleed (DSB) Valve
Explosions can cause loss of life and serious injuries as well as significant damage.The aim of the
MHA Double Safety and Bleed valves combine various valve functions
ATEX directive (94/9/EC) is both to apply a single level for health and safety requirements and to
in one block. This solution is more space saving and contains much less
overcome barriers of trade.
potential leakage points compared to a muliple piped valve solution.
The main purpose of the ATEX directive is to minimize or completely eliminate the risk of ignition
in explosive areas and to limit the harmful effects in case of an explosion. Explosive atmospheres
(Ex areas) can be found where a mixture of air, flammable gases, vapours, mists or dusts are
inflammable
substance
Possible options for MHA DSB valves are
being produced, transformed or stored in the presence of oxygen. This may, for example, be the
case in: power plants, refineries, chemical facilities, paint facilities air- and seaports storage tanks.
Fig. 1: MHA Double Safety and Bleed valves ensures a two stage isolation with an integrated bleed valve at high security work areas. When
Possible ignition sources include
maintenance service is conducted both valves are closed. Through the
•
hot surfaces, flames and hot gases
bleed valve the isolation of the valve can be proven. Through integra-
•
mechanically, electrically or electro-statically generated sparks
ted test points the fluid conditions can constantly been monitored.
•
adiabatic compression
•
electro-magnetic or ionising radiation
Fig. 2: MHA DSB valves allow to carry out maintenance service at
•
chemical reactions
components without shutting the HPU down:
•
ultra-sound
Main valve A is closed. Through opening valve C fluid from mainte-
•
flashes
nance component is bleeded. After closing valve B maintenance can
Fig. 1: Double safety & bleed option
A
C
B
be conducted with double isolation safety level.
Some supplier declare, that ball valves hold no potential ignition source at normal usage, and
therefore don‘t fall under the scope of the ATEX directive. This is not our approach. All MHA
ATEX ball valves underwent a conformity evaluation procedure according the ATEX directive
Available Options
94/9/EG. During the ignition source analysis, it has been detected that trapped air in the clea-
Double Safety & Bleed
rance volume between body and ball may cause an explosive atmosphere. By the use of a spe-
Double Safety & Bleed + Bypass
cial sealing material, the diversion of the electric charging can be guaranteed. This applies to
Double Safety & Bypass
all MHA ATEX ball valves of the series BKH,MKH, KH, BK3, 3/4 KH, PKH, PK3, MPKH and BEKH.
Available Connections
MHA ZENTGRAF is certified for the ATEX class Ex II 2 Gc
ISO 6162-1/2
Group II: all industries except underground mining; Category 2: Zone 1 / 21 (an explosive
ISO 6164
atmosphere is likely to occur in normal operation occasionally); Atmosphere G: gas, vapours
ANSI RF
and mists; Protection Concept c: constructional safety
Fig. 2: System maintenance optimisation
Individual Engineering Solutions
Application Example: Accumulator Regulation Block at Cable Installation Ship
electro magnetic valve
shut off ball valve
sensor quick coupling
pressure sensor
Tailor-made customer solution
Several integrated functions and ball valves
in one block, mutual activation of two blocks.
Why do we have just the right product for offshore industry?
Accumulator regulation block at cable installation ship
Because we can offer a very large number of standardized solutions and various individual
When changing diameter of the installed cable all hydraulic ac-
In total the MHA regulation block
combines the following features:
solutions. Because we combine experience with innovation and employ staff with subs-
cumulator on the ship have to be newly adjusted. An integrated
•
Shut-off ball valve
tantial engineering competence. More than 10% of MHA staff has an engineering degree.
electro magnetic valve inside the MHA accumulator block enables
•
Electro magnetic valve
And because we will not rest until you are satisfied. We supply high-quality ball valves
fully automatic regulation of all accumulator gas filling pressure
•
Pressure sensor
and valves at reasonable prices – including branch competence in offshore as well as oil
through one central control unit.
•
Sensor quick coupling
and gas applications. We offer tailor-made solution for and developed with our costumers
starting with simple modifications of standard products up to combining various valve
functions in one hydraulic block.
Application Example: Special Marine Valve
Application Example: Special Application Vessel
CuAl10Ni
full trunnion
EN 1092
connection
capsuled PEEK
Highly Corrosion Resistant Valves
Gas Valves - Full Trunnion Design
• All
metal parts made of nickel-aluminum-bronze
•
5000 psi (350 bar) full ΔP
• 3“
(DN 80)
•
Carbon or stainless steel up to 8” (DN200)
•
Full trunnion design with capsuled PEEK seats
•
700 psi (50 bar)
• Flange
connection EN 1092 (others on request)
• VDS
•
tested
LRS or other classification society approvals
Class Certificates for Marine & Offshore Projects
MHA ZENTGRAF specializes in fluid dynamic solutions since 1945. No matter what you
want to control, throttle or lock - we are your partner! Our high pressure ball and control
valves are used in many fields of application all over the world – choose from a standard or
individual custom-designed product.
•
DIN EN ISO 9001 and DIN EN ISO 14001 certified
•
PED 97/23/EC certified
•
Acceptance tests according to e.g., EN 12266, API 6D and certificated according to
EN 10204
•
DNV type approval
•
ABS design assessment
•
Individual acceptance tests on request (e.g., LRS Lloyds Register of Shipping, NK Nippon
Kaiji Kyokai …)
•
ATEX certified (Ex II 2G c)
•
Firesafe approval in acc. to ISO 10497 and API 6FA
MHA ZENTGRAF GmbH & Co. KG
MHA ZENTGRAF Flow Control Technology
Ballerner Strasse 8, 66663 Merzig
(Shanghai) Co., Ltd.
Germany
Add: T52-1 South, No. 1510, Chuan Qiao Road
Phone: + 49 6861 / 7000 - 0
Pudong, Shanghai, P.R.C. 201206
Fax: Phone: +86 21 / 5899 2090
+ 49 6861 / 7000 - 77
E-mail: [email protected]
Fax: Internet: www.mha-zentgraf.com
E-mail: [email protected]
+86 21 / 5899 6758
Internet: www.mha-zentgraf.com.cn