Fig 1502 Integral Fittings for Oilfield Flowline: The Complete Buyer's Guide to Tees, Elbows, Crosses, Crossovers & Pup Joints

Every frac job, flowback operation, and well test depends on one thing holding together: the high-pressure flow iron between the wellhead and the treating equipment. Integral fittings — including tees, elbows, crosses, crossovers, and pup joints built with Fig 1502 hammer union connections — are the backbone of that ironwork.

These components route flow, change direction, split streams, and adapt sizes while handling pressure levels that ordinary pipe fittings are not designed to withstand.

Despite how critical they are, Fig 1502 integral fittings are among the least-explained products in the flowline equipment supply category. Most buyers know what they need, but often struggle to find one clear source that explains the full range, compares specifications, and highlights what to check before ordering.

This guide explains the main types of Fig 1502 integral fittings, their applications, and the key technical checks buyers should confirm before placing an order.

What Are Fig 1502 Integral Fittings?

Integral fittings are solid, one-piece forged steel components used to route high-pressure fluid through oilfield flowlines. Unlike fabricated assemblies that are welded or threaded together, integral fittings are machined from a single forged body. This construction helps them support the pressure ratings required for frac, flowback, acidizing, cementing, and well-kill operations.

The Fig 1502 designation refers to the hammer union connection standard used on these fittings. Fig 1502, short for Figure 1502, is one of the most common high-pressure union connections used in the oil and gas industry. It is commonly associated with working pressures up to 15,000 PSIG in standard service.

Hammer union connections use a thread-and-lug system that can be made up or broken out quickly in the field. This is especially important when flowline configurations change between jobs or during active field operations.

Common Fig 1502 Integral Fitting Types

• Tees: T-shaped fittings used for splitting or combining flow.
• Crosses: Four-way fittings used at manifold assembly points.
• Elbows: 90-degree fittings used to change flow direction.
• Laterals: Angled three-way fittings used in specific flowline layouts.
• Crossover unions: Transition fittings used to adapt between different figure sizes or connection genders.
• Pup joints: Short pipe sections used for spacing, length adjustment, and make-up in flowline assemblies.

Integral vs. Fabricated: Why It Matters for High-Pressure Work

In lower-pressure applications, fabricated fittings can be common and cost-effective. These are usually made from pipe sections welded together and fitted with union connections. However, at pressure ranges such as 10,000 PSIG and above, weld zones and heat-affected areas can become weak points.

Forged integral bodies avoid this issue because the entire fitting is made from one continuous forged steel body. This is why high-pressure flowline equipment packages used for frac and flowback service often require integral fittings instead of fabricated assemblies.

When comparing suppliers, buyers should confirm whether the fittings are integrally forged bodies and request documentation such as material test reports or manufacturing records when required.

Types of Fig 1502 Integral Fittings

Tees — 2" and 3" Fig 1502

Tees are among the most commonly used integral fittings in a flowline assembly. They allow one line to split into two, or two lines to combine into one. The 2" and 3" Fig 1502 tees are widely used in frac manifolds, flowback manifolds, and treating iron strings.

Elbows — 4" Fig 1502

Elbows provide 90-degree direction changes in a flowline run. The 4" Fig 1502 elbow is commonly used in high-volume frac and flowback applications where flow restriction should be minimized. Sour service elbows may be available with NACE-compliant body material.

Specification	4" 1502 Elbow
Working Pressure - Standard	15,000 PSIG
Working Pressure - Sour Service	10,000 PSIG
Connection	4" 1502 Female x 4" 1502 Male
Dim A	9.09"
Dim B	9.09"
Dim C - Bore Nominal	5.00"
Dim E	7.0" TYP
Body Material - Sour Service	NACE MR0175 / ISO15156

Crosses — 2", 3", and 4" Fig 1502

Crosses are used at manifold assembly points where four lines meet. They are common in frac manifolds, plug valve manifolds, and trash catcher manifold assemblies. The 4" cross body may include bolt-hole provisions for mounting, which are not available on smaller sizes.

Laterals — Three-Way Angled Fittings

Laterals combine the function of an elbow and a tee. They route the main run while adding a branch connection at an angle. These fittings are used in treating iron strings and manifold entries where a straight tee may create an unfavorable flow path or pressure drop.

Crossover Unions — Fig 1502 Connections in 2" and 3"

Crossover unions are transition fittings used to adapt between different figure sizes or connection genders. In a typical flowline assembly, they help connect a 2" line to a 3" manifold or adapt connection ends on a manifold segment.

These fittings are available in several sizes and configurations. Pressure rating and material requirements should always be confirmed based on the exact configuration and service type. Sour service crossovers may be available with NACE MR0175 / ISO15156 compliant bodies.

Pup Joints — 2" and 3" Fig 1502

A pup joint is a short length of pipe with integral Fig 1502 connections on both ends. Pup joints are used for spacing, make-up, and length adjustment in a flowline string. They are critical for achieving the correct geometry in a manifold or treating iron assembly.

Where Fig 1502 Integral Fittings Are Used

Frac Manifolds and Plug Valve Manifolds

A frac manifold is commonly built from tees, crosses, elbows, pup joints, plug valves, and other high-pressure components using Fig 1502 connections. The integrity of every connection point depends on the quality and compatibility of the integral fittings used.

Flowback and Flowline Equipment

During frac flowback, returning fluid may pass through a flowback manifold that includes integral tees, a Fig 1502 choke tee, a trash catcher manifold, and check valves. These components are connected using 1502 iron and must be specified correctly for pressure, service type, and compatibility.

Treating Iron for Well Services

Acidizing, cementing, sand control, and well-kill operations use treating iron strings assembled from integral fittings, pup joints, plug valves, and related components. Crossover unions and tees are used to match wellhead and equipment connections.

Choke and Kill Manifolds

Choke and kill manifolds use crosses and tees to route flow through choke valves and kill lines. These are safety-critical applications where correct specification and documentation are essential.

Buyer’s Checklist: What to Confirm Before Ordering

Before placing an order with any flowback or flowline equipment supplier, confirm the following details for each component in the assembly:

Frequently Asked Questions

What is the difference between Fig 1502 and Fig 1002 integral fittings?

Both Fig 1502 and Fig 1002 use hammer union connections, but they have different pressure ratings and are not directly interchangeable. Fig 1502 connections are commonly associated with 15,000 PSIG standard service, while Fig 1002 connections are typically associated with 10,000 PSIG service. Always confirm the figure number of every fitting in an assembly.

What does “integral” mean in oilfield fittings?

An integral fitting is machined from a single forged steel body. It does not rely on welded or threaded sections between pressure-containing parts. This matters in high-pressure flowline applications because forged integral bodies reduce the weak points associated with fabricated assemblies.

When do I need NACE MR0175 compliant integral fittings?

NACE MR0175, incorporated into ISO15156, applies to equipment used in environments where hydrogen sulfide may be present. If the application involves sour gas or H2S exposure, pressure-containing components should be specified with suitable NACE-compliant materials at the time of order.

What is a Fig 1502 choke tee?

A Fig 1502 choke tee is an integral tee fitting designed so the branch connection can accept a choke valve. In a flowback manifold, this fitting allows the choke valve to be positioned in the flow path for controlled pressure and flow management.

How should I order pup joints for a Fig 1502 flowline assembly?

When ordering pup joints, specify the nominal size, figure number, length, service type, and connection configuration. Also confirm whether the pup joint is integral or uses detachable connections, depending on the application and maintenance requirements.

Can Fig 1502 integral fittings be used with swivel joints and steel hose loops?

Yes. In many high-pressure frac and flowback flowlines, rigid 1502 iron components are used with swivel joints and steel hose loops. The key is to confirm compatible figure numbers, pressure ratings, and service requirements across the complete assembly.

What certifications should I request from a flowline equipment supplier?

Buyers should request relevant documentation such as API 6A documentation, ISO 9001 certification, Material Test Reports, heat treatment records, and NDT documentation where applicable. Documentation requirements may vary based on product type, service type, and customer specification.

Final Word: Treat Your Iron Selection as Seriously as Your Valve Selection

A frac manifold or flowline assembly is only as strong as its weakest fitting. Procurement teams may carefully specify plug valves and adjustable chokes, but sometimes treat tees, elbows, and crossovers as commodity parts. At high pressures, this approach creates risk.

Pressure rating, service type, forged construction, dimensional compatibility, and certification documentation should be verified for every Fig 1502 integral fitting order. These checks help reduce compatibility issues, safety risks, and costly field delays.

If you need to source a complete package — including tees, crosses, elbows, crossovers, pup joints, plug valves, adjustable chokes, and swivel joints — working with a single flowline equipment supplier can help ensure connection compatibility across the full assembly.