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Regierungspräsidium Darmstadt

Sealing materials

ConcreteRequirementsRequirements ::

• Low and moderate demands:

- Concrete quality B 25 (Verification byreference documentation or insert ofrebound hammer)

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rebound hammer)- Component thickness > 15 cm

• High demand:- Concrete quality B 35, component thickness> 20cm

• Appropriate joint materials

Assesing penetration depth⇒⇒⇒⇒⇒⇒⇒⇒ VerificationVerification ofof tightnesstightness isis establishedestablishedwhenwhen penetrationpenetration depthdepth isis lessless thanthan 66% 66% ofof componentcomponent partpart thicknessthickness

1.4 Materials


Rebound hammer

21.4 Materials


Sealing materials

Asphalt

RequirementsRequirements ::

Low and moderate demands

• Minimal of thickness 4 cm,

Certification of porosity (< 3 %)

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Certification of porosity (< 3 %)

• Applicable joint material

Assessing penetration depth⇒⇒⇒⇒⇒⇒⇒⇒ VerificationVerification ofof tightnesstightness isis establishedestablishedwhenwhen penetrationpenetration depthdepth isis lessless thanthan 66% 66% ofof componentcomponent partpart thicknessthickness

1.4 Materials

FillingFilling sitesite sealedsealedwithwith asphaltasphalt


Construction of joints

General requirementsequirements :

• Prefer jointless constructions• Elaborateness planning of joint configuration

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• Elaborateness planning of joint configurationand construction

• Joint hauling preferably in approachable andtestable areas

• Joint configuration referred to system of rules

1.5 joint construction


Joint construction with bonded joint-strip



Drivable joint

b = 15 - 30 mm dH= 20 – 90 mm Fugenflanken 3 – 5 mm



Sealing with concrete , trough, joint



Sealing areaGeneral requirementsequirements :

A sealed operating area in filling sites is to locate. This area is the surfacewhile filling, it is identified with the horizontal line of pipe betweenconnection tank truck and storage tank, additionally 2,5 m roundly. (water-endangering liquids can blow out under pressure).

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(water-endangering liquids can blow out under pressure).

The size of operating area can be reduced by installing splash guard witha height of 1meter minimum.

1.6 Sealing area


Trough

2,5 m

Operating area

Manhole pit ofa subsurfacetank

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2,5 m

Splash guard, minimum height 1 m

Pipe

1.6 Sealing area


Pipe in connection with sealing system

> 2 %

Connecting pipe

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• Pipes have to be testable for tightness, including junctions to componentsof sealing face.

• Pipes and sealing components have to observe tightnessand consistency requirements.

• Single walled and below ground pipes shall have weld joints, bond orflanged connection which are equate to non-detachably connection

1.6 Sealing area


Controling and monitoring sealing faces

• Expert installation of a sealing system, documented orderly

• Certification of sealing system, conducted byan independent expert

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an independent expert

• Periodical inspection of operational reliabilityin the framework of internal survey andexternal expert inspection

1.7 Monitoring sealing faces


Evaluation of sealing facesVisual Visual inspectioninspectionChecking surface for contamination and damages:- Crack- Damage caused by mechanical attack- Damage caused by chemical attack- Bubble formation, maceration and delamination- Damaged joints

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- Damaged joints

Technical inspectionChecking detected damages for the need for action:- Quantify crack depth and crack width, test for crack transmissibility

- Expose parts of sealing face at random and evaluate- Nondestructive test (rebound hammer)- Measure abrasion of sealing face- Core hole drilling at random

1.7 monitoring sealing faces


2. Oil separatorRange of application

• Oil separators are used on sites where oil loss or oilleakages are possibleOn open areas surface water and cleaning liquid could be added:could be added:

- filling grounds, dealing with mineral oil products- fuel filling sites- truck wash- open repair shop- traffic zone of tank trucks and switching grounds

132.1 Range of application


Mode of function

• The mode of separation is a physical process, whereat difference in density to oil and water is used. The oil separator accelerates and controls thisprocess.process.

• Generally, oil separator consists of three assemblies:- Slurry trap- Separator- Sample shaft

142.2 Mode of function/capacity


Capacity

• Separator capacity is specified by nominal value(Nenngröße , NG)NG 1 means a maximal flow of 1 l/s withoutexceeding limit value for carbon hydrideexceeding limit value for carbon hydride

• NG determination is to calculate on an individual basis. All relevant parameter are to ascertain on a siteinspection. In addition regional rain yield factor is toconsider (heavy rain= 50 l/m²).

152.2 Mode of function/capacity


Slurry trap

• The volume of slurry trap have to be in line with theoil-separator capacity:NG 1 to 3: 600 lNG 3 to 10: 2500lNG > 10: low quantity of slurry: NG x 100 l NG > 10: low quantity of slurry: NG x 100 l

moderate quantity of slurry : NG x 200 lhigh quantity of slurry : NG x 300 l

• Incoming waste water is drained off and settled withdip tube or wash plate

162.3 Slurry trap


Oil separator

• Oil separator should hold a limiting value of20 mg/l for carbon hydride discharging wastewaterto a sewage plant. Discharging wastewater in receiving waters a limiting value of 5 mg/l for carbonhydride is to advice.

• To keep a limit value of 5mg/l for carbon hydride a • To keep a limit value of 5mg/l for carbon hydride a coalescence separator is necessary .

• An automatically acting shut-off feature avoidsuncontrolled wastewater output.

172.4 Oil separator


Sample shaft

• An inclined trough at the bottom of the sample shaftpermitts wastewater extraction and quantity control

• Other split-flows wastewater shall not feed the• Other split-flows wastewater shall not feed the

shaft.

182.5 Sample shaft


Coalescence separator

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Fuel separator + Coalescence separatorused by high rate of inflow and heavy polluted wastewater

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Placing and maintenance• Separator shaft must be at least 130 mm higher thanthe lowest intake works. Therewith an uncontrolled oilemersion can be averted

• periodical controlls are necessary to a proven und failure-free handling:failure-free handling:- monthly function check- half-yearly maintenance- 5-yearly principal inspection (drawdown, cleaning, tightness control)

• Verification of personal qualfication

212.6 Placing and maintenance


• Shut-off feature in action

• More wastewater flows in => backwater

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• If superelevation isimpractical =>installwarning device

2.6 Placing and maintenance


Many thanks for yourattention

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