Installation of Pharmaceutical Process Piping - Part One
Installation of Pharmaceutical Process Piping - Part One
Planning and Preparation
This two-part article is a case study tracking the installation of process piping for (product) filling lines 7 and 8 in Building 21 at the Sicor, Inc. (formerly Gensia Sicor Pharmaceuticals) plant in Irvine, California.
Part 1 includes planning, demolition of existing structures, and preparation for the new installation.
Figures 1A and 1 B. "Before" and "after" pictures show renderings of the desired "look" as a pre-construction Computer Graphic Image (CGI) on the left, while the actual appearance of nearly completed room is shown in the photo on the right. CGI and photo courtesy of Sicor Inc.
Good process piping is fundamental to the success of any pharmaceutical or biopharmaceutical installation. All systems including process equipment and piping, must be fully drainable, cleanable, and sterilizable for the successful production of pharmaceuticals. Over the past decade, advances on several fronts have contributed to make the installation of process piping more efficient and with fewer delays.
As an example of current installation practices, this article is a case study of a process piping installation at a project for Product Filling Lines 7 and 8 in Building 21 at the Sicor Inc. Pharmaceutical Plant in Irvine, California from the summer of 2002 until its completion in March, 2003. In support of the product lines, piping systems for nitrogen, Clean-In-Place piping (CIP), Water For Injection (WFI), Reverse Osmosis (RO) water, Deionized (DI) water, product clean steam, and clean steam condensate were installed.
Projects such as this must be planned in advance by the owner and activities coordinated between the design engineer, general contractor, installing contractor, third party QA (also referred to as the inspection contractor), and the validation team.
Before beginning construction, the owner must have a very clear idea of exactly what he wants the system to look like and how he wants it to function. Computer simulations help to visualize the project before the engineers and vendors are called. Mechanical contractors have greatly improved their fabrication technology for installing process piping. They now have better defined procedures and fewer "cut-outs" of welds which has meant "cleaner" documentation submitted for FDA approval. As a result, productivity is higher.
Figure 2. Welding operator installs an electrode in the orbital weld head which is connected to an orbital welding power supply. A water cooling unit is situated beneath the power supply. Photo courtesy of Pro-Tech Process, Inc
This is partly due to the widespread use of orbital welding and the development by the installing contractors of orbital welding Standard Operating Procedures (SOPs). These SOPs are written procedures followed by welding personnel so that everyone follows the same series of steps in the same order for handling materials, cutting and end-prepping of tubing for welding, inert gas purging, and welding, etc.
Improved standards and guidelines such as the ASME Bioprocessing Equipment Standard coordination and execution. Their welders are experienced in the use of orbital welding equipment - Figure 2. They understand what's required in terms of how the system should look, how to do the isometrics, and the best way of supporting the piping. Proper pipe support is important since the plant is in California and must conform to requirements for seismic zone 4.
IQD Turnover Package
In preparation for Phase I construction, the installing contractor prepared an IQD Turnover Package for each system that was to be relocated including process gases, clean steam, etc. The IQD Turnover Packages each contained a Scope of Work statement, a list of project personnel and their brazing certificate, or for welded systems, welder performance qualifications, Weld Procedure Specifications (WPS), and Procedure Qualification Records (PQR) in compliance with ASME Section IX of the Boiler and Pressure Vessel Code.4 Also included were welding equipment certifications, receiving logs for materials, critical system isometric (ISO) drawings for each of the systems, certificates of cleaned material, and pressure test reports for various system components.
Welded systems had coupon logs, weld logs, borescope logs, and passivation procedures and certificates. At the end of the IQD Turnover Package, there was a sign-off sheet to be turned over at the end of the shutdown for acceptance of the work by the client. The Scope of Work for the shutdown was to isolate and remove process gas lines from the first floor labs in the demolition area and tie-in and re-route process piping systems.
The installing contractor translated engineering drawings from the architect engineer from two- dimensional to three- dimensional isometric construction drawings and then verified that the drawings were "constructible." The general contractor obtained the necessary permits from the city to do the work.
Phase I, June 14 - July 30, 2002,
Demolition and Re-Installation of Existing Systems
The first phase of the piping installation was a shut-down to accommodate a "Tenant Improvement" (TI) situation. This involves relocation of the existing equipment and utilities in the area where the new product lines were to be installed in order to avoid interruption of the then-current production schedule. The demolition phase was on a very tight schedule with crews working around the clock. Bulldozers were used for demolition of walls which were cut down and moved out in large chunks; utilities, lights, phones, fire alarms, etc. were all cut out and then equipment was relocated and re-installed. All process equipment, utilities, and piping had to fit within very confined spaces and there could be no interference among the plumbing, electrical, concrete, carpenters and other trades who had to work in the same space at the same time to complete this phase within the allotted time.
In preparation for Phase II, the installing contractor prepared a separate submittal package for each of the piping systems which included the product lines and piping systems for nitrogen (N2), Clean Air (CLA), Clean-In-place (CIP), Water For Injection (WFI), Reverse Osmosis (RO) water, Deionized (DI) water, product clean steam, and clean steam condensate. For example, the WFI submittal package contained a specification for stainless steel piping materials, such as tubing and fittings, and methods of attachment which included flanges and gaskets, orbital welding, and valves. The remainder of the book contained vendor product information and specifications for the above items as well as for piping insulation material and instrumentation. An orbital Weld Procedure Specification (WPS), qualifying the welding procedure to ASME Sect. IX of the Boiler and Pressure Vessel Code4 and Procedure Qualification Records (PQRs) for each of the welders and isometric drawings for routing the WFI system also were included in the package.
Typically, material availability drives the schedule which means that items with long lead times must be ordered as soon as possible. For this project, the long lead time items are one-of-a kind custom pieces of equipment such as WFI heat exchangers, valve clusters, and other process equipment.
During the past decade, the ratio of orbital welds to manual in biopharmaceutical systems has increased to the point that presently very few manual welds are done. Dr. Richard Campbell of Purity Systems, Inc. reported at a recent ASME BPE Standards meeting that about 99% of welds in biopharmaceutical installations are now done with orbital welding. The BPE standard requires that, if a manual weld is done, it must be with the owner's permission and it must be inspected on the inside (ID) with a borescope as shown in Figure 3.
The welding used in hygienic biopharmaceutical applications is autogenous orbital GTA welding. In this process, an arc is struck between a non-consumable tungsten electrode and the weld joint. This takes place inside an enclosed weld head in an inert gas atmosphere. The tube or fitting being welded remains in place while the electrode in the weld head rotor moves around the joint circumference to complete the weld. Weld parameters such as welding current, electrode travel speed, and pulse times are programmed into the microprocessor-controlled power supplies (Figure 2) and stored as weld programs or weld schedules for each size of tubing, pipe, or component to be welded. Print-outs of weld schedules are included in the weld qualification documents. The weld joint configuration is a square butt preparation in which the tube ends are cut square and machine-faced to fit together without a gap.
Figure 3. Video borescope display showing I.D. weld bead from a field weld and information recorded for each weld. Photo courtesy of Purity Systems, Inc.
The goal of orbital welding is to achieve a very high degree of repeatability from weld to weld, not only to get high productivity, but to provide the best quality system possible. The welding power supply executes the weld parameters with a high degree of accuracy weld after weld. It is up to the installing contractor and his operators to control other factors that could affect weld repeatability. The welding operators received training in operation of the equipment and are proficient at developing weld schedules for each size of tubing and know how to cope with heat-to-heat variation in weldability. Installing contractors have developed Standard Operating Procedures (SOPs) detailing every aspect of the orbital welding process.
ASME BPE Standard
Sicor Inc. hired a third-party QA company to inspect their welds. In addition to weld procedure qualification to ASME Sect. IX and B31.35, inspectors used the visual criteria for weld acceptance from the Materials Joining part of ASME Bioprocessing Equipment Standard (BPE-2002).1 The BPE Standard was originally published in 1997 and was revised in 2002. The BPE Standard was the first standard written for the biopharmaceutical industry that specifically recommends the use of orbital welding.
The Dimensions and Tolerances (DT) Part of the BPE Standard has contributed to improved consistency of orbital welding by specifying acceptance criteria for wall thicknesses and ovality of weld ends of fittings and other components for bioprocess systems. Since the welding current for orbital welding is roughly proportional to wall thickness with about 1 amp of welding current for each 0.001 inch, a variation of more than a few thousandths of an inch in wall thickness could make a difference in weld bead penetration. Similarly, the squareness of the weld end is controlled so that there will be no significant gap between parts when secured in the weld head. Good fit-up and alignment of parts for welding is essential.
The material generally used in high purity biopharmaceutical applications is 316 or 316L stainless steel.6 For welding, the reduced carbon content of 316L is preferred. With higher carbon levels (0.080 wt.% in 316 compared to 0.035 wt.% in 316L), there is a chance of carbon migrating to the grain boundaries in the area immediately adjacent to the weld during welding, combining with chromium and precipitating as chromium carbide leaving the grain boundaries in the Heat-Affected Zone (HAZ) reduced in chromium, and thus subject to intergranular corrosive attack. However, since the formation of chromium carbide is time and temperature dependent, the precisely controlled heat input of orbital welding makes this occurrence less likely than with manual welding.
In the interest of weldability, the DT Part of the BPE standard has limited the sulfur range of type 316L stainless steel used for fittings and weld ends of components to 0.005 to 0.017 weight% and recommends the use of tubing specified to ASTM A270 S-2 Pharmaceutical Grade which has the same sulfur range as the BPE. This is in contrast to the AISI specification which lists a maximum sulfur concentration of 0.030 weight%, but no minimum. Heat-to-heat variation in base metal chemistry of stainless steels results in differences in weldability and is a major cause of weld inconsistency. The limited sulfur range has eliminated much of the uncertainty in fabrication and greatly increased the consistency of orbital tube welding for those using this standard.7
When materials arrive on site, they are received and logged by the installing contractor and then inspected and logged by third-party QA. ASME B31.3 Process Piping Chapter VI distinguishes between examination and inspection. Inspection applies to functions performed for the owner by the owner's inspector or the inspector's delegates (QA), while examination applies to quality control functions performed by the manufacturer, fabricator or erector, in this case the installing contractor (QC). Weld criteria are detailed in the Materials Joining part of the BPE Standard.
by Barbara K. Henon, PhD, Stephan E. Muehlberger, and Gene DePierro
1. ASME Bioprocessing Equipment Standard (BPE-2002), American Society of Mechanical Engineers, Three Park Ave., New York, NY 10016.
2. ISPE Baseline Pharmaceutical Engineering Guide: Volume 4 - Water and Steam Systems, First Edition/January 2001, ISPE, 3109 W. Martin Luther King, Jr. Blvd., Suite 250, Tampa, FL 33607.
3. Code of Federal Regulations - Food and Drug Administration - Current Good Manufacturing Practice for the Manufacture, Processing, Packing, or Holding of Drugs - 21 CFR- Parts 210 & 211, Revised as of November 4, 1998.
4. ASME Sect. IX. Boiler and Pressure Vessel Code, American Society of Mechanical Engineers, Three Park Ave., New York, NY 10016.
5. ASME B31.3 Process Piping 1999 Edition. American Society of Mechanical Engineers, Three Park Ave., New York, NY 10016.
6. Gonzalez, Michelle M., "Stainless Steel Tubing in the Biotechnology Industry," Pharmaceutical Engineering, Vol. 21, No. 5, 2001, pp.48-63.
7. Henon, Barbara. "Specifying the Sulfur Content of Type 316L Stainless Steel for Orbital Welding: Weldability vs. Surface Finish," Tube and Pipe Journal (TPJ), Vol. 14, No.2, 2003, pp. 46-49.
The authors would like to thank Joshua Lohnes and Michael Aubin of Purity Systems, Inc., for sharing their expertise on Quality Assurance and Daryl Roll and Steve Biggers of Astro Pak for sharing their expertise on Passivation.
About the Authors
Barbara K. Henon, PhD, Manager of Technical Publications at Arc Machines, Inc., has been employed by Arc Machines since 1984. During this time, she has been an instructor of orbital tube welding and has written articles on customer applications in the biopharmaceutical, semiconductor, offshore, and other industries which share a need for high-quality welds. She also writes Operator Training Manuals for the company. Dr. Henon is Vice Chair of the Main Committee of the ASME Bioprocessing Equipment Standard and has been a member of the BPE Materials Joining Subcommittee since 1989. She also serves on several AWS and SEMI Standards writing groups. She can be contacted by tel: 1-818/896-9556 or by e-mail: firstname.lastname@example.org Arc Machines, Inc., 10500 Orbital Way, Pacoima, CA 91331.
Stephan E. Muehlberger is a Senior Manager Project and Process Engineer at Sicor Inc. He has been with Sicor since 1995. He has been responsible for the integration of sterile filling lines, inspection/packaging expansions, process compounding suites, facility infrastructure expansions (WFI, clean steam, plant utilities). The current project is a $19 million facility expansion incorporating two sterile filling lines, two compounding lines, two compounding suites, and a component preparation area. His previous experience was as an engineer with a company specializing in plasma cutting. He can be contacted by tel: 1-949/455-4791 or by email: email@example.com. Sicor Pharmaceuticals, Inc., 19 Hughes St., Irvine, CA 92618.
Gene DePierro, President of Pro-Tech Process, Inc., started Pro-Tech in 1997 after many years of process piping experience. He worked for Fluor Daniel and Brown and Root. Pro-Tech is the largest "open shop" process piping contractor in Southern California. Pro-Tech specializes in process piping and cGMP plumbing for pharmaceutical and biotech installations. He can be contacted by tel: 1-858/495-0573 or by e-mail: firstname.lastname@example.org. Pro-Tech Process, Inc., 9484 Chesapeake Dr., Suite 806, San Diego, CA 92123.
Reprinted from Pharmaceutical Engineering
March / April, 2004