Water and Waste Water Solutions

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WATER & WASTEWATER SOLUTIONS

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No More Downtime. As the world’s most trusted provider of integrated piping maintenance, modification and repair capabilities for a full range of applications, TDW delivers customized water and wastewater solutions specifically designed to optimize performance, reduce costs and make downtime a thing of the past.

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TDW Live Pipe

Modification Technology

Line Repairs and Modifications without

Service Interruptions

Only TDW offers a full range of live pipe modification

capabilities that allow vital water and waste water

services to remain uninterrupted during all types of

pipe system alterations while systems are under

flowing and pressurized conditions. As the innovator

and creator of STOPPLE® plugging technology and the industry leader in hot/wet tapping systems, TDW has

been installing or replacing line segments and valves

on large concrete, steel, ductile and cast iron piping

systems and providing field services associated with

these disciplines since the 1950’s.

Maintaining a continuous water supply and uninterrupted waste water disposal capabilities is a crucial concern for municipal and private entities the world over. The loss of clean potable water for any length of time adversely impacts fire protection services, hospitals, schools,

nursing homes and commercial/industrial facilities.

Shutting down and draining water systems for repair

only adds to time delays and expense due to bacterial infiltration and subsequent special procedures to

recertify a clean water supply.

Likewise, waste water systems are subject to severe

environmental limitations regarding the disposal of

liquids and solids that may result from the need to

repair or alter a pipe system. Making pipe system

modifications under full operational, flowing and

pressurized conditions eliminates downtime and

the associated problems resulting from repairs made during system shutdowns.

Live pipe modification technology from TDW assures

continued line flow during the following activities:

Line repair

Valve replacement

Branch connections

Line relocationsAction Sequence for a Tapping and Plugging Job Using a Temporary Bypass to Maintain Flow:1. Two STOPPLE® fittings are installed on the pipe.2. SANDWICH® valves are installed on STOPPLE® fittings.

3. Tapping machine makes taps through both STOPPLE®

fittings.

4. STOPPLE® plugging machines are installed with the option

of a temporary bypass.

5. Plugging heads are lowered into sealing position, diverting

flow through with the option of a temporary bypass.

6. With the flow stopped or diverted via the optional bypass,

workers cut and remove the isolated section.

7. Once the new section is tied in, the plugging heads are

retracted, returning full flow to the main.

8. The plugging machines and optional bypass lines are

removed.

9. Completion plugs are set in the STOPPLE® fittings and the

SANDWICH® valves are removed.

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Tapping and Plugging Services

Case Studies

Location: Las Vegas, Nevada

Problem: The need to expand the capacity of the

Las Vegas area potable water delivery system.

Solution: TDW performed two record-breaking,

102-inch taps in the 120-inch I.D./142-inch O.D.,

steel reinforced concrete pipe with 11-inch

wall thickness using a TDW Model 2400 Tapping

Machine.

Result: The addition of one new 180-inch line

to the existing 120-inch water main running from

Lake Mead.Location: Baltimore, Maryland Problem: The need to tie in their 96-inch Southwest Diversion wastewater main into a new Grit Removal Facility at the Patapsco Wastewater Treatment Plant. The plant receives an average flow of 70 MGD and shutting down the main while making the new con-nection was simply not feasible. Solution: After successfully completing 60-inch taps, TDW Services installed two 60-inch by 96-inch folding head STOPPLE® Plugging Machines. The folded plugging heads were lowered through the

60-inch openings where the plugging heads opened

and created positive seals against the walls of

the pipe.

Result: A 200-foot section of the 96-inch

wastewater line was isolated allowing a

temporary 60-inch bypass to be installed to

maintain flow while the main was being tied

into the new Grit Removal Facility.

Location: New York City

Problem: The Manhattan Pumping Station owned

and operated by New York City’s Department of

Environmental Protection pumps sewage volumes

ranging from 170 MGD to 400 MGD. Faulty 60-inch

suction gate valves were preventing maintenance

service to main sewage pumps 1 and 2, which

meant the possibility of a 96-hour shut down and

the dumping of raw wastewater into the Hudson and

Lower East rivers while lines were bypassed so that

valves could be replaced.

Solution: TDW Services performed hot tapping and

plugging that successfully isolated a 10-foot section

of 42-inch pipe and allowed valve replacements to

take place.

Result: Valve replacement took place without

wastewater discharge into environmentally sensitive

areas. Because the TDW plugging process allowed

the pumping station to continue processing waste-

water, there was additional time to replace what was

discovered to be an excessively worn section

of pipe.