manhole

Top Precast Plant Operational Deficiencies – Part 4

A staff engineer reports on pre-assessment audits for the NPCA Plant Certification Program.

By Evan Gurley

Editor’s Note: In the first two parts of this four-part series, we addressed 10 of the most common problems encountered during a typical pre-assessment plant inspection relating to Chapters 1 through 5 in the NPCA Quality Control Manual for Precast and Prestressed Plants. In parts three and four of this series, we are focusing on product-specific deficiencies relating to Chapter 6, “Special Requirements,” of the NPCA QC Manual. The first three parts of this series were published in the January-February 2012, March-April 2012 and May-June 2012 issues of Precast Inc.

Step Testing
Side-stepping the requirement detailed in Chapter 6 of the QC Manual will land you a deficiency for products that are designed with steps cast into the product. Deficiencies are far too common with this requirement, as the specifics are often not fully grasped.

The NPCA QC Manual states:
“Step vertical and horizontal load testing must be performed according to the applicable sections(s) of ASTM C497 once per year, per step design used and whenever a new step supplier is used. The step testing must be performed in the precast plant in the product for its intended use. The testing must be performed or witnessed and results documented by a member of the precasters Quality Control Department. The loads achieved must meet the requirements of ASTM C478.”

This requirement is clearly laid out in the applicable sections in the NPCA QC Manual, but deficiencies in these sections are common. Read More »

Top Precast Plant Operational Deficiencies – Part 3

A staff engineer reports on pre-assessment audits for the NPCA Plant Certification Program.

By Evan Gurley

Editor’s Note: In the first two parts of this four-part series, we addressed 10 of the most common problems encountered during a typical pre-assessment plant inspection relating to Chapters 1 to 5 in the NPCA QC Manual. In parts three and four of this series, we will focus primarily on product-specific deficiencies relating to Chapter 6, “Special Requirements.”

The requirements in Chapter 6 are in addition and complementary to the requirements in Chapters 1 through 5. Sections 6.1 through 6.5 are intended to demonstrate that the final product is consistent with ASTM International specifications and other industry standards used to verify acceptable product manufacturing and performance.

Proof of conformance
If the plant claims to manufacture certain products that meet ASTM specifications or other industry standards, then the plant should be able to prove such claims. Proof of conformance to specific ASTM or other industry standards should be documented and kept in the plant records for all products that fall under this category. Too many times, a plant will claim that a product is being manufactured to ASTM or other industry standards, but then it will have no proof, documentation or referenced standards/drawings to back up these claims. Read More »

ASTM Manhole Specifications

Of all the ASTM-related technical questions received here at the National Precast Concrete Association, C478, “Standard Specification for Precast Concrete Manhole Sections,” stands out as one of the most popular. Many NPCA members produce precast concrete manholes, as these products are used for so many underground applications such as storm and sanitary sewer access, lift stations and utilities.

The ASTM C478 standard contains the requirements for the manufacture and purchase requirements of products used for the assembly and construction of circular, vertical precast concrete manholes and structures. The scope of C478 includes structures used in precast sewer, drainage and water works. ASTM C478 is an important standard under the jurisdiction of ASTM C13, the technical committee on concrete pipe, established in 1931.

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Building Blocks-Dellinger Precast

By: Ron Hyink

Dellinger Precast Inc. was made with the bricks of hard work and the mortar of lasting friendships upon the cornerstone of quality products and dedicated employees.
Forty years ago, Gary Dellinger came home from Vietnam and, with little more than pocket change, went to work on his parents’ farm in rural North Carolina. One Friday while baling hay, the 23-year-old saw his future drive by right in front of him. It was a truck with a precast concrete septic tank and rig passing by on the country road next to the farm near Denver, N.C.

Immediately he thought, “No one around here makes those – they have to be hauled in!” Everybody out here has to wait a week or two weeks to get a precast tank, he said to himself. So he jumped in his car, followed the truck and watched as the driver set the tank, then followed him to his home base in Hickory, N.C., some 30 miles away.

Gary thought, “I can do this. It’s just manual work – when you’re raised on a farm, you can do this.” He would soon learn that concrete manufacturing calls for more than just muscle and a market for septic tanks when he established Dellinger Precast Inc. Read More »

H2 Precast — A Precast Legacy

H2 Precast Has Become a Haven Family Tradition

By Kirk Stelsel

H2 Precast, NPCA member

When Larry Haven started H2 Precast in 1984 on one acre in Wenatchee, Wash., he never could have imagined his company building a 50,000-sq-ft plant on 15 acres just 23 years later.

His drive was undeniable, but he was also practical. He saw a modest market for precast after the only producer in town went belly up, and set out to meet that need. Through the years, demand has increased and H2 has grown. But, although the new plant sits just 7½ miles down the road from H2’s original location, the journey has been anything but easy.

Through it all, family, quality, pride and perseverance have remained the unwavering principles of H2 Precast. These core values have been passed down from one generation to the next and enabled the company to pull through the tough times, prosper when times are good and accomplish both without compromise. Read More »