Baker Tank Company / Altech

P.O. Box 40 Arp, Texas 75750

100 Hwy 64 East

(903) 859-2111


Fax (903)-859-4191

IFR General Design Specifications


1. Supporting structure and surface covering of the ALTECH IFR's are designed to ensure that all stresses fall within the acceptable limits for the material used when subjected to a uniform load of 500# over 1 sq. ft. anywhere on the deck's surface. The IFR is capable of supporting this load both while floating or when landed and receiving no buoyancy from the pontoons. When landed, the IFR support legs and structure are designed to carry a uniformly distributed load of 12.5 psf over the entire surface.

2. The ALTECH IFR has supporting legs which are adjustable from the topside while in service. Leg length normally provides at lease 6'-0" of clearance between tank and the underside of IFR sheeting, for maintenance purposes. Legs are adjustable to the desired normal operating level for each location. (This will normally fall between 3' & 4'). Support legs will be located so as to clear all obstructions horizontally by at least 12".


The ALTECH IFR pontoon system provides 100% excess flotation and structural rigidity to allow 2 persons (total wt. 500#) to walk side-by-side anywhere on the roof without surface becoming awash with product. For roofs less than 30' in Diameter this criteria may be waived subject to agreement by the purchaser.


ALTECH IFR flotation units are of a type that will not allow it to sink in the event that up to two adjacent pontoons are punctured or ruptured.


Peripheral and other seals are designed to remain in full contact with the mating tank components throughout the entire travel span of the IFR. Provisions can be made to ensure seal contact with the tank wall at points of irregularity such as bulges, out of roundness, or in case the tank is leaning. Recommended seal materials will remain sufficiently resilient under operating conditions to maintain good contact and will not deteriorate under prolonged exposure to the stored product or its vapors. Click here for more information and diagrams.

Air Valve (for vacuum relief)

Each ALTECH IFR will be equipped with an air valve which will open automatically to allow passage of air when necessary. Valve will remain closed at all times except during the actual transfer of product with the IFR landed and is designed to pass air at a volume rate greater than the prescribed filling or emptying rate.


The ALTECH IFR will be equipped with sufficient siphon-type drains to prevent retention of liquid on the top surfaces. The drain pipes will extend into the product at least 4" and will normally be 5/8" diameter for refined product and 11/2" diameter for crude oil applications.

Anti-Rotation System

An anti-rotation system consisting of one cable and guide will be provided with each ALTECH IFR operation. In high turbulence applications, 3/16" S.S. Wire Rope (Minimum of 2) can be added if so specified.

Electrical Grounding

Each ALTECH IFR will be electrically grounded to the tank by two lines of stranded 1/6" flexible stainless steel wire rope attached to the IFR at widely separated points and to the tank roof by means of a corrosion resistant compression type connection. The entire IFR will be continuously conductive electrically except for the peripheral seal to minimize the chance of static charges building up to sparking potential.


A sealed opening for gauging purposes will be installed on the IFR directly beneath the gauging hatch on the tank roof.

Float Guide (optional, to accommodate ground level gauge)

A covered float well may be installed in each ALTECH IFR directly below the tape nozzle on the tank roof. It will permit the level gauge float to move freely, but guided, to within a prescribed distance from the tank floor as emptying continues with the IFR landed. The float well is designed to be easily remove for inspection purposes and also to prevent damage to the IFR, should the gauge tape mechanism jam.

Column Negotiators

Each ALTECH IFR will have negotiating devices for fixed internal tank components such as roof support columns, gauge pipes or ladders which penetrate the IFR. These devices will provide clearance of at least 4 1/2" between the tank component and the structure of the IFR. The resultant opening around the tank component will be covered with a sliding plate containing a flexible seal made to conform closely to the shape and size of the penetrating tank member so as to minimize the escape of vapors.

IFR Manway

IFR will have at least one manway to provide passage between the top and bottom sides for maintenance purposes. The opening will be at least 2.5 sq. ft.

Tank Ventilation

The air space between the IFR surface and the tank roof will be ventilated with ventilators having a total open area equal to or greater than .2 sq. ft. per foot of tank diameter, as recommended in API 650, Appendix H. This ensures there will be no build up of hazardous vapors and is in compliance with all applicable air pollution control regulations.

Filling Surge Protection (recommended)

Tank inlet pipes may be fitted with a diffuser to limit the velocity of product entering the tank to a maximum of 3 ft./sec. and to eliminate the danger of, damage to, or flooding of, the IFR due to the injection of large air or vapor slugs. In addition, the diffuser acts as a relaxation chamber to allow static charges to bleed out of the incoming stream.

Teflon or Nylon Leg Pads

Aluminum supports to be isolated from the carbon steel bottom.

Ladder Pads

IFR to be supplied with a ladder when specified. If a ladder is not supplied, a landing pad to be provided.