When a flange leaks in a critical system, the consequences are never small. Boardman’s bolt torquing services and bolt tensioning services give you precision-controlled bolting solutions backed by calibrated equipment, certified technicians, and strict adherence to ASME PCC-1 guidelines. Whether your application calls for hydraulic torquing or direct stud tensioning, your joint integrity is in the right hands.
Hydraulic torquing is the most widely used controlled bolting method. It works by applying a precise rotational force to a nut or bolt head, producing the target bolt load needed for a leak-free seal.
At Boardman, every job accounts for the K-factor (the nut factor governing the torque-tension relationship) along with lubrication variables and bearing surface conditions. Managed correctly, these factors deliver a consistent axial load across every bolt in a flange assembly. Hydraulic torquing fits your project when:
Boardman’s field technicians use hydraulic torque wrenches sized and configured for your application. Your team gets a documented, repeatable process. Not the best guess.
Tensioning works differently. Instead of applying rotational force, a hydraulic tensioner pulls the stud axially, stretching it to a precise elongation before the nut is seated. This eliminates friction as a variable entirely, resulting in tighter accuracy. For large-diameter studs, high-pressure systems, or joints where uniform gasket compression is critical, bolt-tensioning services are often the right choice.
Here are some tensioning advantages that matter for your project:
When your application demands the tightest possible control over bolt load, tensioning delivers it.
The ASME PCC-1, “Guidelines for Pressure Boundary Bolted Flange Joint Assembly,” is the governing standard for controlled bolting in pressure boundary applications. Following these guidelines is not optional in a critical service. It is the baseline for protecting your personnel, assets, and processes.
Boardman’s technicians are trained to execute ASME flange bolt torque procedures that align with PCC-1 requirements, including:
Every Boardman bolting job produces a documented record because ASME bolt torque compliance is something you need to prove, not just promise.
Both methods can achieve a reliable, leak-free joint when applied correctly. The right choice depends on your bolt size, application criticality, and site conditions.
| Hydraulic Torquing | Hydraulic Tensioning | |
| Best for | Standard flanges, confined spaces, cost-sensitive applications | Large-diameter studs (2 inches+), high-pressure systems, critical service flanges |
| Bolt size | All standard diameters | Larger diameter fasteners |
| Accuracy | Approximately +/- 15 to 30% (improves significantly with trained assemblers and verified K-factor) | Approximately +/- 10% |
| Method | Rotational force applied to nut or bolt head | Axial load applied directly to stud, no friction variable |
Not sure which method fits your application? Your Boardman contact will review your flange specs and recommend the right approach, no guesswork required.
Your industry shapes your bolting requirements. At Boardman, our bolt torquing services and bolt tensioning services support critical applications across:
Zero-leak performance is the objective in every one of these environments. A failed joint is not a maintenance item. It is a safety event, a compliance issue, and a production loss. Boardman takes that seriously, and so should your bolting contractor.
Every hydraulic torque wrench and tensioning tool deployed by Boardman is calibrated to NIST-traceable standards before it arrives on your site. Calibration is the foundation of a verifiable, repeatable bolting process. When your auditors, inspectors, or corporate engineers ask for proof of tool accuracy, you have it. Your project documentation package includes calibration records for every tool used on your job.
Controlled bolting raises real questions, especially when a joint failure is not an option. Here are the answers your project team needs before the work begins.
Torquing applies a rotational force to a nut or bolt head to produce axial load, while tensioning pulls the stud directly in an axial direction to achieve the target elongation. Tensioning eliminates friction as a variable and typically achieves higher accuracy, approximately +/- 10%, compared to torquing. The right method depends on bolt size, joint criticality, and site conditions.
ASME PCC-1 provides guidelines for assembling pressure boundary bolted flange joints. Following these guidelines means your bolting program has documented procedures, trained technicians, and verified torque sequences, all of which reduce the risk of joint failure, leaks, and costly rework. Your engineering and safety teams may require PCC-1 alignment as a condition of the work.
In many cases, yes. Gasket relaxation and bolt embedment after initial pressurization can reduce bolt load. ASME PCC-1 acknowledges this and recommends re-tightening procedures for applicable joint types. Your project engineer should define the re-torque protocol based on your gasket type, operating temperature, and pressure class. Boardman documents and supports multi-pass and post-pressurization re-torque programs.
Uniform gasket compression is achieved through a documented, multi-pass torque sequence using a star or crisscross pattern. Each pass incrementally loads all bolts in the joint before full target torque is applied. For tensioning applications, simultaneous multi-bolt tensioning also reduces the bolt scatter that causes uneven seating. Boardman uses both methods, selected based on your flange class, gasket type, and target bolt load.
Provide your flange class and size (ANSI/ASME rating), stud size and material grade, gasket type, and service conditions (pressure, temperature, fluid), and any applicable specifications or engineering drawings. If you have a bolt torque specification from the original equipment manufacturer (OEM) or your engineering team, share that as well. Boardman works from your drawings and spec requirements. You define the level of involvement, and the team executes from there.
Boardman’s field bolting crews serve Oklahoma, Texas, New Mexico, Colorado, Arkansas, Missouri, and Kansas. If your site is in one of these states, we can mobilize for your project. Outside this area? Reach out, and we will talk through your options.
Boardman holds the following certifications:
Boardman has held ASME certification since 1952. When your project requires a contractor with verified credentials and documented compliance, these are your proof.
You have a schedule to protect, a system to keep sealed, and a team counting on the joint being right the first time. At Boardman, we provide bolt torquing services and bolt tensioning services that provide you the precision, documentation, and accountability you need on critical flange assemblies. Request a quote today.