HDPE Pipes for water treatment Plant in Quezon City

Maynilad is financing P7B for La Mesa Water Treatment Plant advancement

August 29, 2017 | La Mesa Water Treatment plant is being improved and West Zone Concessionaire Maynilad Water Services, Inc. (Maynilad) is willing to spend P7 billion for its modernization. The Facility supplies 2400 million liters per day (MLD) potable water for approximately nine million Maynilad customers.

The Improvement covers the enhancing of the rehabilitation of structures to improve earthquake resiliency, facilities’ treatment capacity and automation of process for a more efficient and reliable operations.

“Investment in additional treatment technologies is necessary given the dramatic shifts in raw water quality brought on by climate change. With this upgrade, water service to our customers will no longer be affected whenever turbidity level in the raw water increases,” said Chief Operating Officer Randolph T. Estrellado.

The Project

Krah Pipes Manila, Inc. was privileged to be part of one of the largest water treatment facilities in the Philippines. Together with Sta. Clara International Corporation, Krah Pipes Manila Inc. supplied HDPE pipes needed for Maynilad’s enormous facility.

The original material DI pipes to be used for the backwash lines were replaced by Krah HDPE pipes and fittings. Installation conditions were 8m depth of sludge as the backwash line will pass through an existing lagoon used for water treatment facility. Pipes will be fully submerged (prone to flooding) during rainy seasons and will be on top of a road passed by heavy equipment during construction and rehabilitation.

The Pipe laying and jointing has to be fast and efficient as the sludge formation are unstable and prone to collapse.

With Krah Pipes technology, transitioning the pipeline from 1800mm DI Material to 1800mm HDPE was made easy by KRAH Pipes as the HDPE 6-meter flange-end pipe were pre-fabricated from Krah Plant and is ready to connect upon delivery. Seismic couplers were removed from the picture as the pipes are already flexible enough to withstand earth movements. Another cost savings by Krah Pipes!

The Backwash line includes 48pcs of 6m lengths 1800mm load bearing pipes, 4 pcs 1800mm custom lenght 45 degree bends, 2pcs 1800mm modified flanged-end pipes and 3pcs of special length pipes accurate up to the nearest millimeter.

The 400-500 mm gravity pipes for sludge line

The Sludge line requires many tailor-made fittings as the area has a very tight working space. Heavy equipment will not be able to access these areas thus, Krah Pipes was the best choice for Maynilad’s Rehabilitation of these smaller pipeline. Pipes are lightweight and doesn’t require large equipment to fit it up.

Even the smaller 400mm HDPE sludge lines can be easily transitioned to DI material with the use of Krah’s Flanged-end special length pipes. The 90-degree Krah bend was able to connect even with the tightest turns. Every joint was tested by Sta. Clara International Corporation jointed with ARUP and passed without doubt.
Sand bedding is used as backfill Materials to protect the pipe’s integrity during ground movement and to avoid any objects detrimental to the pipe. Thrust blocks was also installed for every turn to protect the alignment of the pipes against internal movements. 

The Life-Saver

There has been an error during the installation of 400mm DI pipes. The flange of the existing material could not connect to the supernatant tanks as the hubs were misaligned and DI Pipes are rigid all thorough out. With extensive engineering, Krah Pipes was able to produce a pressure pipe specially bended as the site requires double end flange. The Pipes were delivered pre-fabricated from the plant and was a perfect fit without problems.

Author: Krah Pipes Manila